Co-reporter:Caihua Zhang, Ying Liu, Yingxue Chang, Yanan Lu, Shulin Zhao, Dongdong Xu, Zhihui Dai, Min Han, and Jianchun Bao
ACS Applied Materials & Interfaces May 24, 2017 Volume 9(Issue 20) pp:17326-17326
Publication Date(Web):May 8, 2017
DOI:10.1021/acsami.7b01114
Developing highly efficient and long-durable nanoalloy electrocatalysts toward the hydrogen evolution reaction (HER) are highly desirable for implementation of the water-splitting technique to prepare clean fuels. Though great progress has been achieved, controllable synthesis of hollow NixRuy nanoalloys with a wide component ratio range remains a challenge and their applications for HER have not been explored. Here, a series of necklace-like hollow NixRuy nanoalloys (Ni72Ru28, Ni63Ru37, Ni43Ru57, and Ni29Ru71) are prepared using the galvanic replacement reaction between the Ni nanochains and RuCl3·3H2O and the hollowing process based on the Kirkendall effect. Electrochemical tests reveal that those NixRuy nanoalloys can efficiently catalyze HER in acidic media. Among them, the Ni43Ru57 nanoalloy exhibits the highest catalytic activity with an overpotential of 41 mV to attain a current density of −10 mA cm–2, outperforming other NixRuy nanoalloys and close to commercial Pt/C. Additionally, its current density will exceed Pt/C catalyst as the overpotential surpasses 102 mV. Moreover, such Ni43Ru57 nanoalloy also shows an exceptional durability that can continuously work for 8 h only with a little loss of activity. Deduced from some featured spectroscopic and electrochemical analysis, the excellent catalytic performance of Ni43Ru57 nanoalloy is attributed to the proper component ratio and effective electronic coupling of Ni and Ru, causing the faster interfacial electron transfer kinetics and more available active sites on it compared with other NixRuy nanoalloy ones.Keywords: component control; electrocatalysis; hollow nanostructures; hydrogen evolution reaction; Kirkendall effect; nanoalloys; Ni−Ru;
Co-reporter:Lingzhi Li, Jiangfeng Gong, Chunyan Liu, Yazhou Tian, Min Han, Qianjin Wang, Xihao Hong, Qingping Ding, Weihua Zhu, and Jianchun Bao
ACS Omega March 2017? Volume 2(Issue 3) pp:1089-1089
Publication Date(Web):March 22, 2017
DOI:10.1021/acsomega.6b00535
As a p-type multifunctional semiconductor, CuSe nanostructures show great promise in optoelectronic, sensing, and photocatalytic fields. Although great progress has been achieved, controllable synthesis of CuSe nanosheets (NSs) with a desirable spacial orientation and open frameworks remains a challenge, and their use in supercapacitors (SCs) has not been explored. Herein, a highly vertically oriented and interpenetrating CuSe NS film with open channels is deposited on an Au-coated polyethylene terephthalate substrate. Such CuSe NS films exhibit high specific capacitance (209 F g–1) and can be used as a carbon black- and binder-free electrode to construct flexible, symmetric all-solid-state SCs, using polyvinyl alcohol–LiCl gel as the solid electrolyte. A device fabricated with such CuSe NS films exhibits high volumetric specific capacitance (30.17 mF cm–3), good cycling stability, excellent flexibility, and desirable mechanical stability. The excellent performance of such devices results from the vertically oriented and interpenetrating configuration of CuSe NS building blocks, which can increase the available surface and facilitate the diffusion of electrolyte ions. Moreover, as a prototype for application, three such solid devices in series can be used to light up a red light-emitting diode.Topics: Nanostructures; Polyesters; Solid state electrochemistry; Supercapacitors;
Co-reporter:Lingzhi Li, Jiangfeng Gong, Chunyan Liu, Yazhou Tian, Min Han, Qianjin Wang, Xihao Hong, Qingping Ding, Weihua Zhu, and Jianchun Bao
ACS Omega March 2017? Volume 2(Issue 3) pp:1089-1089
Publication Date(Web):March 22, 2017
DOI:10.1021/acsomega.6b00535
As a p-type multifunctional semiconductor, CuSe nanostructures show great promise in optoelectronic, sensing, and photocatalytic fields. Although great progress has been achieved, controllable synthesis of CuSe nanosheets (NSs) with a desirable spacial orientation and open frameworks remains a challenge, and their use in supercapacitors (SCs) has not been explored. Herein, a highly vertically oriented and interpenetrating CuSe NS film with open channels is deposited on an Au-coated polyethylene terephthalate substrate. Such CuSe NS films exhibit high specific capacitance (209 F g–1) and can be used as a carbon black- and binder-free electrode to construct flexible, symmetric all-solid-state SCs, using polyvinyl alcohol–LiCl gel as the solid electrolyte. A device fabricated with such CuSe NS films exhibits high volumetric specific capacitance (30.17 mF cm–3), good cycling stability, excellent flexibility, and desirable mechanical stability. The excellent performance of such devices results from the vertically oriented and interpenetrating configuration of CuSe NS building blocks, which can increase the available surface and facilitate the diffusion of electrolyte ions. Moreover, as a prototype for application, three such solid devices in series can be used to light up a red light-emitting diode.Topics: Nanostructures; Polyesters; Solid state electrochemistry; Supercapacitors;
Co-reporter:Shun-Li Li;Rong Chen;Kui Li;Zhen-Hui Kang;Shuai-Lei Xie;Long-Zhang Dong;Ya-Qian Lan
ACS Applied Materials & Interfaces June 15, 2016 Volume 8(Issue 23) pp:14535-14541
Publication Date(Web):2017-2-22
DOI:10.1021/acsami.6b02765
Various porous Zn1–xCdxS/CdS heteorostructures were achieved via in situ synthesis method with organic amines as the templates. Because of the larger radius of Cd2+ than that of Zn2+, CdS quantum dots are formed and distributed uniformly in the network of Zn1–xCdxS. The Zn1–xCdxS/CdS heterostructure with small Cd content (10 at%) derived from ethylenediamine shows very high H2-evolution rate of 667.5 μmol/h per 5 mg photocatalyst under visible light (λ ≥ 420 nm) with an apparent quantum efficiency of 50.1% per 5 mg at 420 nm. Moreover, this Zn1–xCdxS/CdS heterostructure photocatalyst also shows an excellent photocatalytic stability over 100 h.Keywords: CdS quantum dots; heterostructure; in situ synthesis; photocatalytic activity; Zn1−xCdxS/CdS;
Co-reporter:Fengzhang Tu, Xin Xu, Pengzi Wang, Ling Si, Xiaosi ZhouJianchun Bao
The Journal of Physical Chemistry C 2017 Volume 121(Issue 6) pp:
Publication Date(Web):February 2, 2017
DOI:10.1021/acs.jpcc.6b12692
Rechargeable sodium-ion batteries have lately received considerable attention as an alternative to lithium-ion batteries because sodium resources are essentially inexhaustible and ubiquitous around the world. Despite recent reports on cathode materials for sodium-ion batteries have shown electrochemical activities close to their lithium-ion counterparts, the major scientific challenge for sodium-ion batteries is to exploit efficient anode materials. Herein, we demonstrate that a hybrid material composed of few-layer SnS2 nanosheets sandwiched between reduced graphene oxide (RGO) nanosheets exhibits a high specific capacity of 843 mAh g–1 (calculated based on the mass of SnS2 only) at a current density of 0.1 A g–1 and a 98% capacity retention after 100 cycles when evaluated between 0.01 and 2.5 V. Employing ex situ high-resolution transmission electron microscopy and selected area electron diffraction techniques, we illustrate the high specific capacity of our anode through a 3-fold mechanism of intercalation of sodium ions along the ab-plane of SnS2 nanosheets and the subsequent formation of Na2S2 and Na15Sn4 through conversion and alloy reactions. The existence of RGO nanosheets in the hybrid material functions as a flexible backbone and high-speed electronic pathways, guaranteeing that an appropriate resilient space buffers the anisotropic dilation of SnS2 nanosheets along the ab-plane and c-axis for stable cycling performance.
Co-reporter:Dongdong Xu;Ying Liu;Shulin Zhao;Yanan Lu;Min Han;Jianchun Bao
Chemical Communications 2017 vol. 53(Issue 10) pp:1642-1645
Publication Date(Web):2017/01/31
DOI:10.1039/C6CC08953D
Ultra-thin palladium nanosheets (PdNSs) with a diameter of ∼0.8 nm and characteristic (110)-oriented flat planes were synthesized by confined growth inside lamellar micelles. The rationally designed pyridinium-type surfactant with a long carbon chain (e.g., C22) is a crucial factor for the construction of PdNSs. The other synthesis parameters, including the reduction rate and concentration of reactants, should be carefully controlled. Owing to the ultra-thin feature, PdNSs performed superior electrocatalytic activity towards glycerol oxidation.
Co-reporter:Xin Xu;Zhifeng Dou;Erlong Gu;Ling Si;Xiaosi Zhou;Jianchun Bao
Journal of Materials Chemistry A 2017 vol. 5(Issue 26) pp:13411-13420
Publication Date(Web):2017/07/04
DOI:10.1039/C7TA03434B
Antinomy (Sb) has received considerable attention as one of the most promising anode materials for sodium-ion batteries (SIBs) because of its high theoretical capacity and suitable working voltage. However, the large volume change of Sb during the alloying/dealloying process causes poor cycling stability and low rate capability, which hinder its practical application. Here, we substantially enhance the sodium storage performance of Sb by binding Sb nanoparticles in ionic liquid-derived nitrogen-enriched carbon (Sb@NC) via pyrolysis of an SbCl3/1-ethyl-3-methylimidazolium dicyanamide mixture. The Sb@NC composite exhibits a high reversible capacity of 440 mA h g−1 at a current density of 100 mA g−1, superior rate performance of 285 and 237 mA h g−1 at the high current densities of 2 and 5 A g−1, respectively, and greatly improved cycle life of 328 mA h g−1 at the current density of 100 A g−1 after 300 cycles in the half cell of SIBs. In the full cell, the energy density of Sb@NC//Na3V2(PO4)3/C is approximately 147 W h kg−1 at a power density of 50 W kg−1. Even at 2.37 kW kg−1, an energy density of around 65 W h kg−1 is still retained. The remarkably improved electrochemical performance could be assigned to the synergistic effect of nanoscale size, uniform distribution, and chemical coupling effect between Sb and ionic liquid-derived nitrogen-enriched carbon.
Co-reporter:Pengzi Wang;Xiaoshu Zhu;Qiaoqiao Wang;Xin Xu;Xiaosi Zhou;Jianchun Bao
Journal of Materials Chemistry A 2017 vol. 5(Issue 12) pp:5761-5769
Publication Date(Web):2017/03/21
DOI:10.1039/C7TA00639J
Sodium-ion batteries (SIBs) have received much attention for scalable electrical energy storage because of the abundance and wide availability of sodium resources. However, it is still unclear whether carbon anodes can realize large-scale commercial application in SIBs as in lithium-ion batteries. Recently, great attention has been devoted to hard carbon which has been treated as a promising choice. Herein, we observe that the turbostratic lattice of kelp-derived hard carbon (KHC) is repeatedly expandable and shrinkable upon cycling, where the interlayer distance varies between 3.9 and 4.3 Å. Such interlayer spacing dilation is highly reversible, giving rise to high rate capability (a stable capacity of 96 mA h g−1 at 1000 mA g−1) and excellent cycling performance (205 mA h g−1 after 300 cycles at 200 mA g−1). Furthermore, kelp-derived hard carbon exhibits a good specific capacity at potentials higher than 0.05 V, which make it an essentially dendrite-free anode for SIBs.
Co-reporter:Xuexi Sheng;Ying Liu;Yu Wang;Yafei Li;Xun Wang;Xinping Wang;Zhihui Dai;Jianchun Bao;Xiangxing Xu
Advanced Materials 2017 Volume 29(Issue 37) pp:
Publication Date(Web):2017/10/01
DOI:10.1002/adma.201700150
Perovskite structured CsPbX3 (X = Cl, Br or I) quantum dots (QDs) have attracted great attention in the past few years for appealing application potentials in photovoltaic and optoelectronic devices. In this report, the CsPbX3 QDs are shown to perform as a new probe for metal ions with high sensitivity, high selectivity and instant response by the quenching or enhancing of the photoluminescence (PL). Through experimental and calculation efforts, the probing mechanisms are investigated. A wide probing window for Cu2+ and Yb3+ ions ranging from 2 × 10−9 to 2 × 10−6m is exhibited for CsPbBr3 QDs. In practice, the CsPbBr3 QDs are successfully applied for fast probing Cu2+ ions in edible oils and vehicle lubricating oils with the precision consistent to the values measured by inductively coupled plasma (ICP). Thus, it provides a promising powerful tool in detecting certain metal ions in biological and industrial organic solution systems.
Co-reporter:Yingxue Chang, Nai-En Shi, Shulin Zhao, Dongdong Xu, Chunyan Liu, Yu-Jia Tang, Zhihui Dai, Ya-Qian Lan, Min Han, and Jianchun Bao
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 34) pp:22534
Publication Date(Web):August 8, 2016
DOI:10.1021/acsami.6b07209
Core–shell nanohybrids containing cheap inorganic nanocrystals and nanocarbon shells are promising electrocatalysts for water splitting or other renewable energy options. Despite that great progress has been achieved, biomimetic synthesis of metal phosphates@nanocarbon core–shell nanohybrids remains a challenge, and their use for electrocatalytic oxygen evolution reaction (OER) has not been explored. In this paper, novel nanohybrids composed of coralloid Co2P2O7 nanocrystal cores and thin porous nanocarbon shells are synthesized by combination of the structural merits of supramolecular polymer gels and a controllable thermal conversion technique, i.e., temperature programmable annealing of presynthesized supramolecular polymer gels that contain cobalt salt and phytic acid under a proper gas atmosphere. Electrocatalytic tests in alkaline solution show that such nanohybrids exhibit greatly enhanced electrocatalytic OER performance compared with that of Co2P2O7 nanostructure. At a current density of 10 mA cm–2, their overpotential is 0.397 V, which is much lower than that of Co2P2O7 nanostructures, amorphous Co-Pi nanomaterials, Co(PO3)2 nanosheets, Pt/C, and some reported OER catalysts, and close to that of commercial IrO2. Most importantly, both of their current density at the overpotential over 0.40 V and durability are superior to those of IrO2 catalyst. As revealed by a series of spectroscopic and electrochemical analyses, their enhanced electrocatalytic performance results from the presence of thin porous nanocarbon shells, which not only improve interfacial electron penetration or transfer dynamics but also vary the coordination environment and increase the number of active 5-coordinated Co2+ sites in Co2P2O7 cores.Keywords: carbon; cobalt phosphates; coordination environment and geometry; core−shell nanostructures; electrocatalysis; oxygen evolution reaction
Co-reporter:Kui Li, Rong Chen, Shun-Li Li, Shuai-Lei Xie, Xue-Li Cao, Long-Zhang Dong, Jian-Chun Bao, and Ya-Qian Lan
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 7) pp:4516
Publication Date(Web):February 2, 2016
DOI:10.1021/acsami.5b11388
Heteronanomaterials composed of suitable semiconductors enable the direct conversion from solar power into clean and renewable energy. Ternary heterostructures with appropriate configuration and morphology possess rich and varied properties, especially for improving the photocatalytic activity and stability synchronously. However, suitable ternary heterostructure prototypes and facile while effective strategy for modulating their morphology and configuration are still scarce. Herein, various ternary ZnS-CdS-Zn1–xCdxS heterostructures with tunable morphology (0 to 2 D) and semiconductor configurations (randomly distributed, interface mediated, and quantum dots sensitized core@shell heterostructures) were facilely synthesized via one-pot hydrothermal method resulting from the different molecular structures of the amine solvents. Semiconductor morphology, especially configuration of the ternary heterostructure, shows dramatic effect on their photocatalytic activity. The CdS sensitized porous Zn1–xCdxS@ZnS core@shell takes full advantage of ZnS, Zn1–xCdxS and CdS and shows the maximal photocatalytic H2-production rate of 100.2 mmol/h/g and excellent stability over 30 h. This study provides some guidelines for the design and synthesis of high-performance ternary heterostructure via modulation of semiconductor configuration and morphology using one-pot method.Keywords: configuration; core−shell; morphology; photocatalytic activity; ternary heterostructure
Co-reporter:Kui Li, Rong Chen, Shun-Li Li, Min Han, Shuai-Lei Xie, Jian-Chun Bao, Zhi-Hui Dai and Ya-Qian Lan
Chemical Science 2015 vol. 6(Issue 9) pp:5263-5268
Publication Date(Web):18 Jun 2015
DOI:10.1039/C5SC01586C
We designed and successfully fabricated a ZnS/CdS 3D mesoporous heterostructure with a mediating Zn1−xCdxS interface that serves as a charge carrier transport channel for the first time. The H2-production rate and the stability of the heterostructure involving two sulfides were dramatically and simultaneously improved by the careful modification of the interface state via a simple post-annealing method. The sample prepared with the optimal parameters exhibited an excellent H2-production rate of 106.5 mmol h−1 g−1 under visible light, which was 152 and 966 times higher than CdS prepared using ethylenediamine and deionized water as the solvent, respectively. This excellent H2-production rate corresponded to the highest value among the CdS-based photocatalysts. Moreover, this heterostructure showed excellent photocatalytic stability over 60 h.
Co-reporter:Lingyun Hu, Xiaoshu Zhu, Yichen Du, Yafei Li, Xiaosi Zhou, and Jianchun Bao
Chemistry of Materials 2015 Volume 27(Issue 23) pp:8138
Publication Date(Web):November 17, 2015
DOI:10.1021/acs.chemmater.5b03920
Sodium-ion batteries have recently attracted considerable attention as a promising alternative to lithium-ion batteries owing to the natural abundance and low cost of sodium compared with lithium. Among all proposed anode materials for sodium-ion batteries, antimony is a desirable candidate due to its high theoretical capacity (660 mA h g–1). Herein, an antimony/multilayer graphene hybrid, in which antimony is homogeneously anchored on multilayer graphene, is produced by a confined vapor deposition method. The chemical bonding can realize robust and intimate contact between antimony and multilayer graphene, and the uniform distribution of antimony and the highly conductive and flexible multilayer graphene can not only improve sodium ion diffusion and electronic transport but also stabilize the solid electrolyte interphase upon the large volume changes of antimony during cycling. Consequently, the antimony/multilayer graphene hybrid shows a high reversible sodium storage capacity (452 mA h g–1 at a current density of 100 mA g–1), stable long-term cycling performance with 90% capacity retention after 200 cycles, and excellent rate capability (210 mA h g–1 under 5000 mA g–1). This facile synthesis approach and unique nanostructure can potentially be extended to other alloy materials for sodium-ion batteries.
Co-reporter:Yichen Du, Xiaoshu Zhu, Xiaosi Zhou, Lingyun Hu, Zhihui Dai and Jianchun Bao
Journal of Materials Chemistry A 2015 vol. 3(Issue 13) pp:6787-6791
Publication Date(Web):02 Mar 2015
DOI:10.1039/C5TA00621J
Co3S4 porous nanosheets embedded in flexible graphene sheets have been synthesized through a simple freeze-drying and subsequent hydrazine treatment process. The robust structural stability of the as-prepared three-dimensional sandwich-like Co3S4–PNS/GS composite affords improved rate performance and cycling stability for both lithium and sodium storage.
Co-reporter:Suli Liu, Tianxiang Wei, Qian Liu, Wenwen Tu, Yaqian Lan, Min Han, Jianchun Bao and Zhihui Dai
Analytical Methods 2015 vol. 7(Issue 8) pp:3466-3471
Publication Date(Web):23 Mar 2015
DOI:10.1039/C4AY01857E
We develop a novel strategy for the biosensing application of hydrogen peroxide (H2O2) using nanoscaled Au–horseradish peroxidase (HRP) composite thin film synthesized by a liquid–liquid interface reaction. Through the interaction between Au nanoparticles and NH2-terminated HRP, HRP is effectively combined with Au in the thin film. The nanocomposite membrane is extracted on the surface of the ITO electrode directly, retaining its bioactivity during the immobilization process, which can detect the substrate in situ. The immobilized HRP displays an excellent electrocatalytic response to the reduction of H2O2, with a fast amperometric response (within 5 s), wide linear range (7.9 μM to 3.6 mM), low detection limit (0.035 μM), and a good affinity (Kappm = 0.14 mM) to H2O2. The prepared biosensor also exhibits high sensitivity, good reproducibility and long-term stability. Furthermore, it can be successfully exploited for the determination of H2O2 released from living cells directly adhered on the modified electrode surface.
Co-reporter:Yichen Du
The Journal of Physical Chemistry C 2015 Volume 119(Issue 28) pp:15874-15881
Publication Date(Web):June 23, 2015
DOI:10.1021/acs.jpcc.5b03540
Tungsten disulfide, which possesses a well-defined layered structure, has been intensively studied as an anode material for lithium ion batteries, but it usually suffers from poor cycling stability because of its large volume changes during lithium insertion and extraction processes. Herein, we develop a self-assembled double carbon coating to enhance the anode performance of WS2 via a self-assembly process between oleylamine-coated WS2 nanosheets and graphene oxide and subsequent pyrolysis treatment. When employed as an anode material for lithium ion batteries, the as-prepared WS2@C/reduced graphene oxide (WS2@C/RGO) composite exhibits excellent cycling stability and rate capability when compared to WS2@C nanosheets. A reversible capacity of 486 mA h g–1 and around 90% capacity retention were obtained after 200 cycles at a current density of 0.5 A g–1. Even under 10 A g–1, a high reversible capacity of 126 mA h g–1 can be retained. The good electrochemical performance could be attributed to the external electronically conductive and flexible RGO coating in addition to the surface carbon layer and the uniform distribution of WS2 nanosheets. The self-assembled dual carbon coating strategy is facile yet effective, and it may be applied to other high-capacity anode materials with huge volume changes and poor electrical conductivities.
Co-reporter:Hui-Qing Dong, Yu-Yun Chen, Min Han, Shun-Li Li, Jie Zhang, Ji-Sen Li, Ya-Qian Lan, Zhi-Hui Dai and Jian-Chun Bao
Journal of Materials Chemistry A 2014 vol. 2(Issue 5) pp:1272-1276
Publication Date(Web):13 Nov 2013
DOI:10.1039/C3TA13585C
We synthesized a novel mesoporous Mn2O3 nanostructure as an electrocatalyst support, then Pd–Mn2O3 with different Pd loading amounts were obtained by a facile solvothermal method. The Pd–Mn2O3 demonstrated a good competitive ORR activity and a high selectivity in alkaline medium, which can be comparable to commercial Pt/C catalysts.
Co-reporter:Suli Liu, Long Zhang, Yanrong Li, Min Han, Zhihui Dai, and Jianchun Bao
Inorganic Chemistry 2014 Volume 53(Issue 16) pp:8548-8554
Publication Date(Web):August 1, 2014
DOI:10.1021/ic501128n
PbS/PbI2 nanocomposites were prepared by choosing K[PbI3] as both a lead salt and an iodide precursor and acetone/water as a reaction medium. It was found that the amount of the PbI2 component could be controlled, to some extent, by varying the amount of water used. Further, this simple bicomponent precursor-based synthetic route can be extended to prepare other lead-containing nanocomposites such as Pb3O4/PbI2 and PbSe/PbI2. Because of the heavy-atom effect, PbS/PbI2 nanocomposites exhibited good and composition-dependent electrogenerated chemiluminescence (ECL) performance, demonstrating their potential in the development of novel ECL sensors for analytical and clinical applications. These interesting findings would encourage us to gain deep insight on these phenomena, which could lead to the further development of these new inorganic materials and their applications.
Co-reporter:Chunli Zhang, Huanhuan Yin, Min Han, Zhihui Dai, Huan Pang, Yulin Zheng, Ya-Qian Lan, Jianchun Bao, and Jianmin Zhu
ACS Nano 2014 Volume 8(Issue 4) pp:3761
Publication Date(Web):March 6, 2014
DOI:10.1021/nn5004315
Due to their unique electronic and optoelectronic properties, tin selenide nanostructures show great promise for applications in energy storage and photovoltaic devices. Despite the great progress that has been achieved, the phase-controlled synthesis of two-dimensional (2D) tin selenide nanostructures remains a challenge, and their use in supercapacitors has not been explored. In this paper, 2D tin selenide nanostructures, including pure SnSe2 nanodisks (NDs), mixed-phase SnSe–SnSe2 NDs, and pure SnSe nanosheets (NSs), have been synthesized by reacting SnCl2 and trioctylphosphine (TOP)-Se with borane-tert-butylamine complex (BTBC) and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone. Utilizing the interplay of TOP and BTBC and changing only the amount of BTBC, the phase-controlled synthesis of 2D tin selenide nanostructures is realized for the first time. Phase-dependent pseudocapacitive behavior is observed for the resulting 2D nanostructures. The specific capacitances of pure SnSe2 NDs (168 F g–1) and SnSe NSs (228 F g–1) are much higher than those of other reported materials (e.g., graphene-Mn3O4 nanorods and TiN mesoporous spheres); thus, these tin selenide materials were used to fabricate flexible, all-solid-state supercapacitors. Devices fabricated with these two tin selenide materials exhibited high areal capacitances, good cycling stabilities, excellent flexibilities, and desirable mechanical stabilities, which were comparable to or better than those reported recently for other solid-state devices based on graphene and 3D GeSe2 nanostructures. Additionally, the rate capability of the SnSe2 NDs device was much better than that of the SnSe NS device, indicating that SnSe2 NDs are promising active materials for use in high-performance, flexible, all-solid-state supercapacitors.Keywords: 2D nanostructures; electrochemistry; flexibility; phase control; supercapacitors; tin selenide
Co-reporter:Xiaosi Zhou ; Xia Liu ; Yan Xu ; Yunxia Liu ; Zhihui Dai ;Jianchun Bao
The Journal of Physical Chemistry C 2014 Volume 118(Issue 41) pp:23527-23534
Publication Date(Web):September 23, 2014
DOI:10.1021/jp507116t
Antimony has attracted enormous attention as anode materials for sodium-ion batteries owing to its high theoretical gravimetric capacity (∼660 mA h g–1). Despite the outstanding gravimetric capacity advantage, antimony suffers from unsatisfactory electrochemical performance originating from its huge volume changes during repeated sodium insertion/extraction. Herein, we synthesize an SbOx/reduced graphene oxide (SbOx/RGO) composite through a wet-milling approach accompanied by redox reaction between Sb and GO. When used as an anode material for sodium-ion batteries, SbOx/RGO exhibits high rate capability and stable cycling performance. A reversible capacity of 352 mA h g–1 was obtained even at a current density of 5 A g–1. More than 95% capacity retention (409 mA h g–1) was achieved after 100 cycles at a current density of 1 A g–1. The excellent electrochemical performance is due to the Sb–O bonding between nanometer-sized SbOx particles surface and highly conductive RGO, which can not only effectively prevent SbOx nanoparticles from aggregation upon cycling but also promote the electrons and sodium ions transportation.
Co-reporter:Min Han, Suli Liu, Linyan Zhang, Can Zhang, Wenwen Tu, Zhihui Dai, and Jianchun Bao
ACS Applied Materials & Interfaces 2012 Volume 4(Issue 12) pp:6654
Publication Date(Web):November 16, 2012
DOI:10.1021/am301814y
In this article, the novel octopus-tentacle-like Cu nanowire-Ag nanocrystals heterostructures have been fabricated in solution phase via heterogeneous nucleation and growth of Ag nanocrystals on presynthesized Cu nanowires. The growth environment and dynamic factors of Ag nanocrystals play an important role for formation of such heterostructures. Combined the physical constants of Cu and Ag with a series of control experiments, the epitaxial growth means of Ag nanocrystals on Cu nanowire is found to abide by “layer-plus-island” (Stranski-Krastanow) mode. Because of the presence of multiple junctions and strong synergistic effect of their constituents, the obtained heterostructures exhibit greatly enhanced electrocatalytic performance toward oxygen reduction reaction compared with that of pure Ag nanocrystals, Cu nanowires, and mechanically mixed dual components as well as recently reported some non-Pt materials, which can be served as an alternative cathodic electrocatalyst to apply in alkaline fuel cells. Moreover, our method can be extended to fabricate octopus-tentacle-like Cu nanowire-Au nanocrystals and Cu nanowire-Pd nanocrystals heterostructures.Keywords: Ag nanocrystals; Cu nanowires; electrocatalysis; heterogeneous nucleation and growth; heterostructure; oxygen reduction reaction;
Co-reporter:Suli Liu;Min Han;Yi Shi;Chengzhi Zhang;Yu Chen;Jianchun Bao ;Zhihui Dai
European Journal of Inorganic Chemistry 2012 Volume 2012( Issue 23) pp:3740-3746
Publication Date(Web):
DOI:10.1002/ejic.201200236
Abstract
In this paper, we describe how multipod Pd nanocrystals (NCs) have been synthesized on the gram scale by means of a simple solid–liquid phase reaction route (i.e., thermal reduction of solid Pd(CH3COO)2 in the liquid mixture of dodecylamine, oleic acid, and 1-octadecene under a temperature-programmed mode). The nanostructure evolves from the initially generated larger polyhedral NCs into smaller ones and then into the final multipods. The dodecylamine acts as both a mild reductant and a promoter, which affects the reduction rate and decreases the size of the initially formed polyhedral PdNCs. The morphology of the final NCs, such as tri- and tetrapods, may be determined by the number of growing points on each polyhedral NC. According to the temperature- and time-dependent experiments, a multistep growth mechanism including digestive ripening, oriented attachment, and fusion process is proposed. This simple solid–liquid phase reaction route can be extended to prepare other multipod metal nanostructures. The multipod PdNCs are found to have a high electrochemically active surface area and possess excellent electrocatalytic performance toward the oxidation of formic acid. Relative to that of polyhedral Pd and commercial Pd black catalysts, the multipod PdNCs exhibit much higher catalytic activity and long-term stability, which may make them a good candidate catalyst for direct formic acid fuel cells. This developed synthetic strategy together with the provided fundamental understanding of heterogeneous nucleation and growth has great potential for contriving a rational route to the preparation of advanced nanomaterials with specific morphology for catalytic and other functional applications.
Co-reporter:Min Han, Suli Liu, Xiaopeng Nie, Dan Yuan, Peipei Sun, Zhihui Dai and Jianchun Bao
RSC Advances 2012 vol. 2(Issue 14) pp:6061-6067
Publication Date(Web):01 May 2012
DOI:10.1039/C2RA20119D
In this paper, small-sized monodisperse Ag nanocrystals (NCs) have been successfully synthesized at gram-scale by thermal reduction of a large amount of solid AgNO3 (more than 10 mmol) with dodecylamine in 1-octadecene solvent. The formation process of the Ag NCs is different from that of a conventional homogeneous phase synthetic system. According to the temperature- and time-dependent experiments, a high temperature “digestive ripening” mechanism is suggested to elucidate their formation process. The size of Ag NCs can be easily controlled by the amount of solid AgNO3 added and the reaction temperature. Furthermore, the obtained Ag NCs are found to possess extraordinary catalytic activity, which can catalyze a series of Sonogashira reactions with high yield. Interestingly, under identical conditions, their catalytic activities are higher than that of similar sized Pd NCs, showing great promise for the substitution of conventional Pd-based catalysts to apply in the Sonogashira reaction. This developed synthetic strategy together with the fundamental understanding of heterogeneous nucleation and growth has great potential towards the contriving rational route for mass production of nanomaterials for advanced catalytic and other functional applications.
Co-reporter:Min Han, Dan Yuan, Suli Liu, Jianchun Bao, Zhihui Dai, Jianming Zhu
Materials Research Bulletin 2012 47(12) pp: 4438-4444
Publication Date(Web):
DOI:10.1016/j.materresbull.2012.09.044
Co-reporter:Yanfen Li, Min Han, Hongyan Bai, Yong Wu, Zhihui Dai, Jianchun Bao
Electrochimica Acta 2011 Volume 56(Issue 20) pp:7058-7063
Publication Date(Web):1 August 2011
DOI:10.1016/j.electacta.2011.05.119
A novel aptamer biosensor with easy operation and good sensitivity, specificity, stability and reproducibility was developed by immobilizing the aptamer on water soluble CdSe quantum dots (QDs) modified on the top of the glassy carbon electrode (GCE). Methylene blue (MB) was intercalated into the aptamer sequence and used as an electrochemical marker. CdSe QDs improved the electrochemical signal because of their larger surface area and ion centers of CdSe QDs may also had a major role on amplifying the signal. The higher ion concentration caused more combination of aptamer which caused larger signal. The thrombin was detected by differential pulse voltammetry (DPV) quantitatively. Under optimal conditions, the two linear ranges were obtained from 3 to 13 μg mL−1 and from 14 to 31 μg mL−1, respectively. The detection limit was 0.08 μg mL−1 at 3σ. The constructed biosensor had better responses compared with that in the absence of the CdSe QDs immobilizing. The control experiment was also carried out by using BSA, casein and IgG in the absence of thrombin. The results showed that the aptasensor had good specificity, stability and reproducibility to the thrombin. Moreover, the aptasensor could be used for detection of real sample with consistent results in comparison with those obtained by fluorescence method which could provide a promising platform for fabrication of aptamer based biosensors.
Co-reporter:Dr. Min Han;Yanrong Li;Hongyan Niu;Lili Liu; Kunji Chen; Jianchun Bao; Zhihui Dai; Jianming Zhu
Chemistry - A European Journal 2011 Volume 17( Issue 13) pp:3739-3745
Publication Date(Web):
DOI:10.1002/chem.201002066
Abstract
Spherical PbSe hollow nanostructure assemblies (HNSAs) were synthesized by a simple one-pot solid/liquid-phase reaction in which solid KPbI3⋅2 H2O and SeO2 are heated in oleic acid/dodecylamine/1-octadecene at 250 °C for 30 min. XRD analysis shows that the obtained product is cubic-phase PbSe and well crystallized. FESEM and TEM images reveal that the obtained spherical PbSe assemblies are made up of small, irregular, and fused hollow nanostructure building blocks. On the basis of temperature- and time-dependent investigations as well as control experiments, molten-salt corrosion of solid PbSe nanocrystal aggregates formed in situ during the high-temperature ripening stage is suggested to explain the formation of such novel assemblies. Moreover, when the reaction temperature is further increased to 280 or 320 °C with other conditions unchanged, cubic and orthorhombic mixed-phase PbSe HNSAs is generated. The obtained PbSe HNSAs exhibit excellent electrogenerated chemiluminescence (ECL) performance. Two strong and stable emission peaks at about −1.4 and +1.5 V (vs. Ag/AgCl) are observed. In particular, the ECL intensity is influenced by the crystal phase of PbSe.
Co-reporter:Hongyan Bai, Min Han, Yuezhi Du, Jianchun Bao and Zhihui Dai
Chemical Communications 2010 vol. 46(Issue 10) pp:1739-1741
Publication Date(Web):07 Jan 2010
DOI:10.1039/B921004K
Porous tubular palladium nanostructures were synthesized by electrodeposition of palladium into a CdS modified alumina template and subsequent removal of CdS; the nanostructures provided a promising platform for the fabrication of nonenzymatic glucose sensors.
Co-reporter:Yucui Han, Shaohua Liu, Min Han, Jianchun Bao and Zhihui Dai
Crystal Growth & Design 2009 Volume 9(Issue 9) pp:3941-3947
Publication Date(Web):July 10, 2009
DOI:10.1021/cg900066z
The dendritic Ag nanostructure with ordered branches and a “clean” surface has been successfully prepared via a facile surfactant-free and acetone-based mixed solvents route at room temperature. Experiments and structural characterizations reveal that the dendritic Ag nanostructure is evolved from the initially generated triangular nanoplates by the reaction of AgNO3 with l-ascorbic acid to the dendrites through both the Ostwald ripening and the oriented attachment growth processes. The acetone plays the key role in controlling the nucleation, growth, conversion, and assembly of the Ag nanoparticles. In the absence of acetone, only the polyhedral particles can be obtained. The yield of the dendrites is dependent on the volume ratio of acetone to water. The present work provides an example for the synthesis of a novel metal nanostructure by simply adjusting the solvent components, which is important for the qualitative understanding of the solvent effect on the morphology of nanostructures and the controllable synthesis of desired nanostructures. The dendritic Ag nanostructure possesses surface-enhanced Raman scattering (SERS) performance similar to that from triangular Ag nanoplates, and they both show much better SERS enhancement ability than that of polyhedral Ag particles which might be relative to their different geometric shapes and microstructures. It is expected that the dendritic Ag nanostructure may find potential applications such as in catalysis, molecular probe, and biological sensing.
Co-reporter:Zhihui Dai ;Shaohua Liu Dr.;Jianchun Bao ;Huangxian Ju
Chemistry - A European Journal 2009 Volume 15( Issue 17) pp:4321-4326
Publication Date(Web):
DOI:10.1002/chem.200802158
Co-reporter:Zhihui Dai, Ke Liu, Yawen Tang, Xiaodi Yang, Jianchun Bao and Jian Shen
Journal of Materials Chemistry A 2008 vol. 18(Issue 16) pp:1919-1926
Publication Date(Web):10 Mar 2008
DOI:10.1039/B717794A
A novel nano-sized tetragonal pyramid-shaped porous ZnO (TPSP-ZnO) structure was, for the first time, prepared with a high morphological yield by a simple polyglycol-assisted wet chemical method. It was found that the polyglycol had a significant influence on the nucleation and pore formation in the ZnO nanostructure. The OH−concentration and the zinc counter-ion affected the morphology of the produced ZnO nanostructure. TPSP-ZnO can be used as an efficient matrix for immobilizing horseradish peroxidase (HRP) and applied to sense hydrogen peroxide (H2O2). Interestingly, it had better biosensing properties than solid spherical ZnO nanoparticles, which might result from the larger specific surface area of TPSP-ZnO, causing a higher HRP loading, and the tetragonal pyramid-shaped porous nanostructure having high fraction of surface atoms located on the corners and edges, resulting in an improved catalytic activity.
Co-reporter:Zhihui Dai, Jie Zhang, Jianchun Bao, Xiaohua Huang and Xiangyin Mo
Journal of Materials Chemistry A 2007 vol. 17(Issue 11) pp:1087-1093
Publication Date(Web):22 Dec 2006
DOI:10.1039/B614203F
CdS hollow spheres of about 25 nm average diameter and about 5 nm shell thickness can be easily synthesized in an aqueous solution of polyglycol. It was found that the polyglycol had a significant influence on the formation of the CdS hollow spheres, because when the experiments were carried out in the absence of polyglycol, only solid particles were formed. High-resolution transmission electron microscopy (HRTEM) shows the shell of the CdS hollow spheres is formed by a layer of primary CdS particles. The Brunauer–Emmett–Teller (BET) surface area of the CdS hollow spheres calculated from the N2 adsorption isotherm is 98.2 m2 g−1, which is much larger than the value of about 49.8 m2 g−1 calculated for the surface area of solid spheres. Compared with previous reports, the prepared hollow spheres have a small diameter, a large surface area and a thin shell. The photoluminescence (PL) spectrum of the CdS hollow spheres at 220 nm excitation shows two sharp emission peaks centered ∼493 nm and ∼530 nm which may be ascribed to the near band edge emission arising from the recombination of excitons and/or shallow trapped electron–hole pairs. Electrogenerated chemiluminescence (ECL) from the CdS hollow spheres and its first application to sensing H2O2 were studied. The H2O2 sensor based on ECL from the CdS hollow spheres had much better responses than those from CdS solid nanoparticles and had good stability.
Co-reporter:Jie Zhang, Zhihui Dai, Jianchun Bao, Ning Zhang, M. Arturo López-Quintela
Journal of Colloid and Interface Science 2007 Volume 305(Issue 2) pp:339-344
Publication Date(Web):15 January 2007
DOI:10.1016/j.jcis.2006.09.073
We report the first observation of the formation of novel Co-based three-dimensional (3D) self-assembly hollow nanostructures, i.e., nest-shaped nanospheres composed of sheet-like particles, via reduction of cobalt salt with sodium tetrahydroboride in cetyltrimethylammonium bromide (CTAB)–cyclohexane–NH4F aqueous solutions. It was found that the cyclohexane has a significant influence on the formation of the nest-shaped Co-based nanospheres, because when the experiments are carried out in the absence of cyclohexane, only sheet-like particles are formed. NH4F plays also an important role in the formation of the hollow nanostructures because without this salt mainly solid spherical structures, composed of sheet-like particles, instead of nest-shaped structures are obtained. The nanostructures are mainly formed by Co, but also a minor amount (17%) of Co2B is present in the final compounds. The structures are characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), and field-emission scanning electron microscopy (FESEM). A possible mechanism for the formation of the novel Co-based nanostructures is proposed.Synthesis of novel nest-shaped Co-based nanospheres, composed of sheet-like particles, is reported. A possible mechanism for the formation of these nanostructures is put forward.
Co-reporter:Yingguang Li, Ping Zhou, Zhihui Dai, Zhixin Hu, Peipei Sun and Jianchun Bao
New Journal of Chemistry 2006 vol. 30(Issue 6) pp:832-837
Publication Date(Web):15 May 2006
DOI:10.1039/B604581M
PdCo bimetallic hollow nanospheres with a diameter of about 80 nm were for the first time synthesized in polyethylene glycol solution. This new Pd-containing bimetallic hollow nanostructure was successfully applied to catalysis of the Sonogashira reaction, which reveals obvious advantages such as environmentally friendly reaction conditions (the reaction proceeded in water), the recyclability of the catalyst, simple experimental operation and high yields.
Co-reporter:Pengzi Wang, Xiaoshu Zhu, Qiaoqiao Wang, Xin Xu, Xiaosi Zhou and Jianchun Bao
Journal of Materials Chemistry A 2017 - vol. 5(Issue 12) pp:NaN5769-5769
Publication Date(Web):2017/02/22
DOI:10.1039/C7TA00639J
Sodium-ion batteries (SIBs) have received much attention for scalable electrical energy storage because of the abundance and wide availability of sodium resources. However, it is still unclear whether carbon anodes can realize large-scale commercial application in SIBs as in lithium-ion batteries. Recently, great attention has been devoted to hard carbon which has been treated as a promising choice. Herein, we observe that the turbostratic lattice of kelp-derived hard carbon (KHC) is repeatedly expandable and shrinkable upon cycling, where the interlayer distance varies between 3.9 and 4.3 Å. Such interlayer spacing dilation is highly reversible, giving rise to high rate capability (a stable capacity of 96 mA h g−1 at 1000 mA g−1) and excellent cycling performance (205 mA h g−1 after 300 cycles at 200 mA g−1). Furthermore, kelp-derived hard carbon exhibits a good specific capacity at potentials higher than 0.05 V, which make it an essentially dendrite-free anode for SIBs.
Co-reporter:Xin Xu, Zhifeng Dou, Erlong Gu, Ling Si, Xiaosi Zhou and Jianchun Bao
Journal of Materials Chemistry A 2017 - vol. 5(Issue 26) pp:NaN13420-13420
Publication Date(Web):2017/05/23
DOI:10.1039/C7TA03434B
Antinomy (Sb) has received considerable attention as one of the most promising anode materials for sodium-ion batteries (SIBs) because of its high theoretical capacity and suitable working voltage. However, the large volume change of Sb during the alloying/dealloying process causes poor cycling stability and low rate capability, which hinder its practical application. Here, we substantially enhance the sodium storage performance of Sb by binding Sb nanoparticles in ionic liquid-derived nitrogen-enriched carbon (Sb@NC) via pyrolysis of an SbCl3/1-ethyl-3-methylimidazolium dicyanamide mixture. The Sb@NC composite exhibits a high reversible capacity of 440 mA h g−1 at a current density of 100 mA g−1, superior rate performance of 285 and 237 mA h g−1 at the high current densities of 2 and 5 A g−1, respectively, and greatly improved cycle life of 328 mA h g−1 at the current density of 100 A g−1 after 300 cycles in the half cell of SIBs. In the full cell, the energy density of Sb@NC//Na3V2(PO4)3/C is approximately 147 W h kg−1 at a power density of 50 W kg−1. Even at 2.37 kW kg−1, an energy density of around 65 W h kg−1 is still retained. The remarkably improved electrochemical performance could be assigned to the synergistic effect of nanoscale size, uniform distribution, and chemical coupling effect between Sb and ionic liquid-derived nitrogen-enriched carbon.
Co-reporter:Ying Liu, Suli Liu, Zhiwen Che, Shuchen Zhao, Xuexi Sheng, Min Han and Jianchun Bao
Journal of Materials Chemistry A 2016 - vol. 4(Issue 42) pp:NaN16697-16697
Publication Date(Web):2016/09/27
DOI:10.1039/C6TA07124D
The development of bifunctional catalysts for both the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) is crucial for facile hydrogen production via water splitting and reducing oxygen to promote electrochemical energy conversion in fuel cells. Here, we prepare a unique concave octahedral Pd@PdPt electrocatalyst, which integrates three structural types, core–shell, concave and alloy structures, using an ethylene glycol system. Scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDS) line-scan, and X-ray photoelectron spectroscopy (XPS) analyses reveal that the concave octahedral Pd core is surrounded by a PdPt alloy shell. Through some control experiments, a possible mechanism for the formation of the nanostructure is proposed. The as-prepared Pd@PdPt NCs exhibit a superior enhanced bifunctional electrocatalytic performance for both the ORR and the HER, even better than that of 20% Pt/C. When used in the ORR, the concave octahedral Pd@PdPt NCs exhibit a superior half-potential of 0.91 V (vs. RHE), a large mass activity of 0.95 A mgPt−1, and a superior stability over 1000 cycles in 0.1 M KOH. When used in the HER, these NCs present a positive onset potential of −5 mV (vs. RHE), a small Tafel slope of 38 mV dec−1, a lower overpotential of ∼39 mV at a current density of 10 mA cm−2 and a long-term durability over 4000 cycles in 0.5 M H2SO4. This study enables the design of multi-structural bifunctional electrocatalysts for the renewable energy field.
Co-reporter:Dongdong Xu, Ying Liu, Shulin Zhao, Yanan Lu, Min Han and Jianchun Bao
Chemical Communications 2017 - vol. 53(Issue 10) pp:NaN1645-1645
Publication Date(Web):2017/01/03
DOI:10.1039/C6CC08953D
Ultra-thin palladium nanosheets (PdNSs) with a diameter of ∼0.8 nm and characteristic (110)-oriented flat planes were synthesized by confined growth inside lamellar micelles. The rationally designed pyridinium-type surfactant with a long carbon chain (e.g., C22) is a crucial factor for the construction of PdNSs. The other synthesis parameters, including the reduction rate and concentration of reactants, should be carefully controlled. Owing to the ultra-thin feature, PdNSs performed superior electrocatalytic activity towards glycerol oxidation.
Co-reporter:Hongyan Bai, Min Han, Yuezhi Du, Jianchun Bao and Zhihui Dai
Chemical Communications 2010 - vol. 46(Issue 10) pp:NaN1741-1741
Publication Date(Web):2010/01/07
DOI:10.1039/B921004K
Porous tubular palladium nanostructures were synthesized by electrodeposition of palladium into a CdS modified alumina template and subsequent removal of CdS; the nanostructures provided a promising platform for the fabrication of nonenzymatic glucose sensors.
Co-reporter:Kui Li, Rong Chen, Shun-Li Li, Min Han, Shuai-Lei Xie, Jian-Chun Bao, Zhi-Hui Dai and Ya-Qian Lan
Chemical Science (2010-Present) 2015 - vol. 6(Issue 9) pp:NaN5268-5268
Publication Date(Web):2015/06/18
DOI:10.1039/C5SC01586C
We designed and successfully fabricated a ZnS/CdS 3D mesoporous heterostructure with a mediating Zn1−xCdxS interface that serves as a charge carrier transport channel for the first time. The H2-production rate and the stability of the heterostructure involving two sulfides were dramatically and simultaneously improved by the careful modification of the interface state via a simple post-annealing method. The sample prepared with the optimal parameters exhibited an excellent H2-production rate of 106.5 mmol h−1 g−1 under visible light, which was 152 and 966 times higher than CdS prepared using ethylenediamine and deionized water as the solvent, respectively. This excellent H2-production rate corresponded to the highest value among the CdS-based photocatalysts. Moreover, this heterostructure showed excellent photocatalytic stability over 60 h.
Co-reporter:Yichen Du, Xiaoshu Zhu, Xiaosi Zhou, Lingyun Hu, Zhihui Dai and Jianchun Bao
Journal of Materials Chemistry A 2015 - vol. 3(Issue 13) pp:NaN6791-6791
Publication Date(Web):2015/03/02
DOI:10.1039/C5TA00621J
Co3S4 porous nanosheets embedded in flexible graphene sheets have been synthesized through a simple freeze-drying and subsequent hydrazine treatment process. The robust structural stability of the as-prepared three-dimensional sandwich-like Co3S4–PNS/GS composite affords improved rate performance and cycling stability for both lithium and sodium storage.
Co-reporter:Zhihui Dai, Jie Zhang, Jianchun Bao, Xiaohua Huang and Xiangyin Mo
Journal of Materials Chemistry A 2007 - vol. 17(Issue 11) pp:NaN1093-1093
Publication Date(Web):2006/12/22
DOI:10.1039/B614203F
CdS hollow spheres of about 25 nm average diameter and about 5 nm shell thickness can be easily synthesized in an aqueous solution of polyglycol. It was found that the polyglycol had a significant influence on the formation of the CdS hollow spheres, because when the experiments were carried out in the absence of polyglycol, only solid particles were formed. High-resolution transmission electron microscopy (HRTEM) shows the shell of the CdS hollow spheres is formed by a layer of primary CdS particles. The Brunauer–Emmett–Teller (BET) surface area of the CdS hollow spheres calculated from the N2 adsorption isotherm is 98.2 m2 g−1, which is much larger than the value of about 49.8 m2 g−1 calculated for the surface area of solid spheres. Compared with previous reports, the prepared hollow spheres have a small diameter, a large surface area and a thin shell. The photoluminescence (PL) spectrum of the CdS hollow spheres at 220 nm excitation shows two sharp emission peaks centered ∼493 nm and ∼530 nm which may be ascribed to the near band edge emission arising from the recombination of excitons and/or shallow trapped electron–hole pairs. Electrogenerated chemiluminescence (ECL) from the CdS hollow spheres and its first application to sensing H2O2 were studied. The H2O2 sensor based on ECL from the CdS hollow spheres had much better responses than those from CdS solid nanoparticles and had good stability.
Co-reporter:Zhihui Dai, Ke Liu, Yawen Tang, Xiaodi Yang, Jianchun Bao and Jian Shen
Journal of Materials Chemistry A 2008 - vol. 18(Issue 16) pp:NaN1926-1926
Publication Date(Web):2008/03/10
DOI:10.1039/B717794A
A novel nano-sized tetragonal pyramid-shaped porous ZnO (TPSP-ZnO) structure was, for the first time, prepared with a high morphological yield by a simple polyglycol-assisted wet chemical method. It was found that the polyglycol had a significant influence on the nucleation and pore formation in the ZnO nanostructure. The OH−concentration and the zinc counter-ion affected the morphology of the produced ZnO nanostructure. TPSP-ZnO can be used as an efficient matrix for immobilizing horseradish peroxidase (HRP) and applied to sense hydrogen peroxide (H2O2). Interestingly, it had better biosensing properties than solid spherical ZnO nanoparticles, which might result from the larger specific surface area of TPSP-ZnO, causing a higher HRP loading, and the tetragonal pyramid-shaped porous nanostructure having high fraction of surface atoms located on the corners and edges, resulting in an improved catalytic activity.
Co-reporter:Hui-Qing Dong, Yu-Yun Chen, Min Han, Shun-Li Li, Jie Zhang, Ji-Sen Li, Ya-Qian Lan, Zhi-Hui Dai and Jian-Chun Bao
Journal of Materials Chemistry A 2014 - vol. 2(Issue 5) pp:NaN1276-1276
Publication Date(Web):2013/11/13
DOI:10.1039/C3TA13585C
We synthesized a novel mesoporous Mn2O3 nanostructure as an electrocatalyst support, then Pd–Mn2O3 with different Pd loading amounts were obtained by a facile solvothermal method. The Pd–Mn2O3 demonstrated a good competitive ORR activity and a high selectivity in alkaline medium, which can be comparable to commercial Pt/C catalysts.
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