Co-reporter:Bing Zhang;Shu-Yu Zhao;Hong-Hui Wang;Tian-Jian Zhao;Yong-Xing Liu;Li-Bing Lv;Xiao Wei;Jie-Sheng Chen
Chemical Communications 2017 vol. 53(Issue 76) pp:10544-10547
Publication Date(Web):2017/09/21
DOI:10.1039/C7CC05444K
The oxygen evolution reaction (OER) is the rate-limiting process for water splitting, and highly efficient large-area OER photoanodes have been considered as an essential part in photoelectrochemical water splitting reactors. The high hole–electron separation efficiency of photoanodes is highly required for real applications of photoanodes in sufficiently harvesting solar energy. Herein we show that the inactive g-C3N4 nanolayers can be self-assembled with BiVO4 into a highly coupled BV/CN dyad to significantly enhance the charge separation efficiency of BiVO4 photoelectrodes for the OER. The incident photon-to-current conversion efficiency (IPCE) of visible light (400 nm) provided by the scalable BV/CN-5 photoanode was estimated to be 50% at 1.23 V vs. RHE in 0.5 M Na2SO4 solution and significantly increased to 97% at a bias voltage of 1.6 V vs. RHE.
Co-reporter:Jun-Jun Zhang, Hui Su, Hong-Hui Wang, Zhong-Hua Xue, Bing Zhang, Xiao Wei, Xin-Hao Li, Shin-Ichi Hirano, Jie-Sheng Chen
Nano Energy 2017 Volume 39(Volume 39) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.nanoen.2017.07.008
•We have designed and developed an Ohmic contact-based hybrid electrode for OER by a facile one-step hydrothermal method.•The Ohmic contact was highly effective to strengthen electrochemical kinetics.•The cobalt selenide/Ti mesh hybrid electrode could provide a current density of 29.6 mA cm−2 at 1.8 V vs. RHE.Oxygen evolution reaction (OER) is a kinetically slow process for overall water splitting, particularly in neutral electrolyte. Great efforts have been devoted to the control in either composition or mesoscale structure of the nanocatalysts for accelerating the OER performance. However, the interface between the nanocatalysts and current collector, the third aspect to be considered for the design of an OER dyadic electrode, has been less touched till now. As a proof-of-concept study here, we described the importance of constructing an Ohmic contact at the interface of the cobalt selenide nanostructures (as the active components) and the Ti mesh (as the current collector) to significantly promote the OER performance in neutral electrolyte. The cobalt selenide/Ti mesh hybrid electrode could provide a current density of 29.6 mA cm−2 at an OER overpotential of 570 mV and high durability in neutral medium.Useful Contact: Besides optimizing the composition and/or mesoscale structure of the nanocatalysts for accelerating the OER performance, constructing interface contact between the nanocatalysts and current collector is the third aspect to be considered for the design of a OER electrode. An Ohmic contact at the interface of Co0.85Se nanosheets and rationally selected current collector Ti mesh (Ti@Co0.85Se) significantly accelerated the OER, achieving a current density of 29.6 mA cm−2 at an overpotential of 570 mV and high durability in neutral medium.Download high-res image (179KB)Download full-size image
Co-reporter:Tian-Lu Cui;Jie-Sheng Chen
Chinese Journal of Chemistry 2017 Volume 35(Issue 5) pp:577-580
Publication Date(Web):2017/05/01
DOI:10.1002/cjoc.201600701
AbstractMesoporous TS-1 nanocrystals were facilely synthesized without involving additional templates. The usage of inorganic silicon source, less structure-directing agent and high yields of nearly 100% made this template-free strategy suitable for large-scale synthesis with low cost. Furthermore, the as synthesized TS-1 exhibited comparable epoxidation performance than those obtained by other methods.
Co-reporter:Zhong-Hua Xue;Hui Su;Qiu-Ying Yu;Bing Zhang;Hong-Hui Wang;Jie-Sheng Chen
Advanced Energy Materials 2017 Volume 7(Issue 12) pp:
Publication Date(Web):2017/06/01
DOI:10.1002/aenm.201602355
A controllable vacuum-diffusion method for gradual phosphidation of carbon coated metallic Co nanoparticles into Co/CoP Janus nanoparticles is reported. Janus Co/CoP nanoparticles, as typical Mott–Schottky electrocatalysts, exhibit excellent hydrogen evolution reaction and oxygen evolution reaction performance in various electrolytes across wide pH range along with high durability. The Mott–Schottky Co/CoP catalyst can work as bifunctional electrode materials for overall water splitting in wide pH range and can achieve a current density of 10 mA cm−2 in neutral electrolyte at only 1.51 V.
Co-reporter:Hui SuKe-Xin Zhang, Bing Zhang, Hong-Hui Wang, Qiu-Ying Yu, Xin-Hao Li, Markus Antonietti, Jie-Sheng Chen
Journal of the American Chemical Society 2016 Volume 139(Issue 2) pp:811-818
Publication Date(Web):December 23, 2016
DOI:10.1021/jacs.6b10710
Heterogeneous catalysts of inexpensive and reusable transition-metal are attractive alternatives to homogeneous catalysts; the relatively low activity of transition-metal nanoparticles has become the main hurdle for their practical applications. Here, the de novo design of a Mott–Schottky-type heterogeneous catalyst is reported to boost the activity of a transition-metal nanocatalyst through electron transfer at the metal/nitrogen-doped carbon interface. The Mott–Schottky catalyst of nitrogen-rich carbon-coated cobalt nanoparticles (Co@NC) was prepared through direct polycondensation of simple organic molecules and inorganic metal salts in the presence of g-C3N4 powder. The Co@NC with controllable nitrogen content and thus tunable Fermi energy and catalytic activity exhibited a high turnover frequency (TOF) value (8.12 mol methyl benzoate mol–1 Co h–1) for the direct, base-free, aerobic oxidation of benzyl alcohols to methyl benzoate; this TOF is 30-fold higher than those of the state-of-the-art transition-metal-based nanocatalysts reported in the literature. The presented efficient Mott–Schottky catalyst can trigger the synthesis of a series of alkyl esters and even diesters in high yields.
Co-reporter:Li-Na Han, Li-Bing Lv, Qian-Cheng Zhu, Xiao Wei, Xin-Hao Li and Jie-Sheng Chen
Journal of Materials Chemistry A 2016 vol. 4(Issue 20) pp:7841-7847
Publication Date(Web):21 Apr 2016
DOI:10.1039/C6TA02143C
High energy density, low cost and ultra-stable bifunctional electrocatalysts that act simultaneously for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are important for commercializing the rechargeable Zn–air batteries. Co-doped TiO2 nanoparticles as an ultra-stable and cheap electrocatalyst exhibited excellent activity for both ORR and OER in alkaline media. A real air cathode made of the Co-doped TiO2 electrocatalyst further offered superior high energy density (778 mA h gZn−1 and 938.5 W h kgZn−1 at 5 mA cm−2, and 785.9 mA h gZn−1 and 911.3 W h kgZn−1 at 20 mA cm−2) and ultra-high stability (37 cycles for 750 h of operation at 20 mA cm−2 and 3150 cycles for 1050 h of operation at 5 mA cm−2) in two-electrode Zn–air batteries.
Co-reporter:Tian-Lu Cui, Li-Bing Lv, Wen-Bei Zhang, Xin-Hao Li and Jie-Sheng Chen
Catalysis Science & Technology 2016 vol. 6(Issue 14) pp:5262-5266
Publication Date(Web):06 Jun 2016
DOI:10.1039/C6CY00379F
Mesoporous ZSM-5 nanocrystals with an optimized Si/Al ratio and mesoporosity were facilely synthesized without involving additional template in high yield, exhibiting high stability and high propylene selectivity for the methanol to propylene reaction. Kilogram-scale production of mesoporous ZSM-5 nanocrystals ensured their possible applications as catalysts in industry.
Co-reporter:Li-Na Han, Xiao Wei, Bing Zhang, Xin-Hao Li, Qian-Cheng Zhu, Kai-Xue Wang and Jie-Sheng Chen
RSC Advances 2016 vol. 6(Issue 62) pp:56765-56771
Publication Date(Web):01 Jun 2016
DOI:10.1039/C6RA08815E
Rational control in both the chemical structures of nitrogen dopants and the mechanical structure in the mesoscale is the key point for optimizing the electrocatalytic activities of carbon nanocatalysts. Here we report the fabrication of N-doped carbon nano-nets (denoted g-N-MM-Cnet) with precise dopant distribution at graphitic sites and multiple-scale pore dimensions via supramolecular assemblies of block copolymer P123. The enriched graphitic nitrogen dopants, high surface area (1947 m2 g−1) and microporous–mesoporous bimodal nanopores in g-N-MM-Cnet make it an excellent bifunctional electrocatalyst for oxygen evolution and reduction reactions to construct rechargeable and ultra-stable (cycling lifetime: 491 h) two-electrode alkaline zinc–air batteries with a high energy density of up to 866.4 W h kgZn−1 at 5 mA cm−2.
Co-reporter:Tian-Lu Cui;Wen-Yu Ke;Wen-Bei Zhang;Hong-Hui Wang;Dr. Xin-Hao Li;Dr. Jie-Sheng Chen
Angewandte Chemie International Edition 2016 Volume 55( Issue 32) pp:9178-9182
Publication Date(Web):
DOI:10.1002/anie.201602429
Abstract
Pd nanoparticles were successfully encapsulated inside mesoporous silicalite-1 nanocrystals (Pd@mnc-S1) by a one-pot method. The as-synthesized Pd@mnc-S1 with excellent stability functioned as an active and reusable heterogeneous catalyst. The unique porosity and nanostructure of silicalite-1 crystals endowed the Pd@mnc-S1 material general shape-selectivity for various catalytic reactions, including selective hydrogenation, oxidation, and carbon–carbon coupling reactions.
Co-reporter:Hui Su, Hong-Hui Wang, Bing Zhang, Kai-Xue Wang, Xin-Hao Li, Jie-Sheng Chen
Nano Energy 2016 Volume 22() pp:79-86
Publication Date(Web):April 2016
DOI:10.1016/j.nanoen.2016.02.014
•Highly integrated cobalt nanoparticle/carbon nanofibers (Co@CNF) with high Co content is prepared.•The Co@CNF is obtained via nanoscale assembly and carbonization of metal–organic complex nanofibers.•The Co@CNF performs even better than Pt/C in concentrated basic electrolyte for HER.Highly integrated cobalt nanoparticle/carbon nanofibers (Co@CNF) with high Co content is indispensable for the efficient electrocatalytic activity, exemplified with hydrogen evolution reaction (HER) here. The Co@CNF, obtained via nanoscale assembly and carbonization of metal–organic complex nanofibers performed even better than Pt/C in concentrated basic electrolyte for HER with an overpotential of only 196 mV (vs RHE) at the current density of 10 mA/cm2 in 1 M KOH.Electron transportation tunnel: Highly integrated cobalt nanoparticle/carbon nanofibers (Co@CNF) with high Co content is indispensable for the efficient electrocatalytic activity, exemplified with hydrogen evolution reaction (HER) here. The Co@CNF, obtained via nanoscale assembly and carbonization of metal–organic complex nanofibers performed even better than Pt/C in concentrated basic electrolyte for HER with an overpotential of only 196 mV (vs RHE) at the current density of 10 mA/cm2 in 1 M KOH.
Co-reporter:Bing Zhang;Hong-Hui Wang;Hui Su;Li-Bing Lv;Tian-Jian Zhao;Jie-Min Ge
Nano Research 2016 Volume 9( Issue 9) pp:2606-2615
Publication Date(Web):2016 September
DOI:10.1007/s12274-016-1147-1
A facile method was developed to fabricate nitrogen-doped graphene microtubes (N-GMT) with ultra-thin walls of 1–4 nm and large inner voids of 1–2 μm. The successful introduction of nitrogen dopants afforded N-GMT more active sites for significantly enhanced hydrogen evolution reaction (HER) activity, achieving a current density of 10 mA·cm–2 at overpotentials of 0.464 and 0.426 V vs. RHE in 0.1 and 6 M KOH solution, respectively. This HER performance surpassed that of the best metal-free catalyst reported in basic solution, further illustrating the great potential of N-GMT as an efficient HER catalyst for real applications in water splitting and chlor-alkali processes.
Co-reporter:Tian-Lu Cui;Wen-Yu Ke;Wen-Bei Zhang;Hong-Hui Wang;Dr. Xin-Hao Li;Dr. Jie-Sheng Chen
Angewandte Chemie 2016 Volume 128( Issue 32) pp:9324-9328
Publication Date(Web):
DOI:10.1002/ange.201602429
Abstract
Pd nanoparticles were successfully encapsulated inside mesoporous silicalite-1 nanocrystals (Pd@mnc-S1) by a one-pot method. The as-synthesized Pd@mnc-S1 with excellent stability functioned as an active and reusable heterogeneous catalyst. The unique porosity and nanostructure of silicalite-1 crystals endowed the Pd@mnc-S1 material general shape-selectivity for various catalytic reactions, including selective hydrogenation, oxidation, and carbon–carbon coupling reactions.
Co-reporter:Li-Bing Lv, Tian-Nan Ye, Ling-Hong Gong, Kai-Xue Wang, Juan Su, Xin-Hao Li, and Jie-Sheng Chen
Chemistry of Materials 2015 Volume 27(Issue 2) pp:544
Publication Date(Web):December 23, 2014
DOI:10.1021/cm503988n
Due to the high cost of Pt-based materials for electrocatalysis, substitute catalysts composed of nonprecious metals have been in high demand. Herein, an ultrastable electrocatalyst with cobalt nanocrystals grown through the plane of graphene subunits of nitrogen-doped graphenes was synthesized via a one-step route. The catalyst has more positive onset and half-wave potential than Pt/C, high methanol crossover tolerance, and superior stability. It is the introduction of strongly bonded cobalt nanocrystals into the network of graphenes that modulate the electronic properties of the latter, resulting in the superb electrocatalytic performance.
Co-reporter:Lin-Tong Guo, Yi-Yu Cai, Jie-Min Ge, Ya-Nan Zhang, Ling-Hong Gong, Xin-Hao Li, Kai-Xue Wang, Qi-Zhi Ren, Juan Su, and Jie-Sheng Chen
ACS Catalysis 2015 Volume 5(Issue 1) pp:388
Publication Date(Web):December 10, 2014
DOI:10.1021/cs501692n
A magnetically recyclable carbon nitride supported Au–Co nanoparticles (Au–Co@CN) displayed exceedingly high photocatalytic activity for hydrolysis of aqueous ammonia borane (NH3BH3, AB) solution. Combined with a synergetic effect between Au and Co nanoparticles, the Motty–Schottky effect at the metal–semiconductor interface remarkably facilitated the catalytic performance of the Au–Co@CN catalyst on the hydrolysis of AB. The TOF value of Au–Co@CN catalyst is 2897 mol H2 mol–1 metal h–1 at 298 K under visible light irradiation, which is more than 3 times higher than that of the benchmarked catalyst, PVP-stabilized Au@Co nanoparticles.Keywords: ammonia borane; Au−Co nanoparticles; carbon nitride; hydrolysis; magnetically recyclable; photocatalysis
Co-reporter:Tian-Nan Ye, Wei-Jie Feng, Bing Zhang, Miao Xu, Li-Bing Lv, Juan Su, Xiao Wei, Kai-Xue Wang, Xin-Hao Li and Jie-Sheng Chen
Journal of Materials Chemistry A 2015 vol. 3(Issue 26) pp:13926-13932
Publication Date(Web):27 May 2015
DOI:10.1039/C5TA03485J
Proper disposal of waste paper is an important waste-management concern. We developed a facile and inexpensive method to transform waste paper into graphene-tethered carbon fiber composite paper (GCCP). Urea was the only additive for the carbonization of the GCCP. The as-obtained GCCP exhibited high electrical conductivity, and GCCP/polydimethyl siloxane (GCCP/PDMS) composites showed good stretchability with great electromechanical stability. The surface of the GCCP membrane was observed to be superhydrophobic; this property apparently endowed the membrane with the ability to separate oil from water in our experiments, which makes GCCP a promising candidate material for cleanup of oil spills. The hierarchical structure, N doping feature and low decoration with Pt make GCCP a potential electrocatalyst for oxygen reduction, oxygen evolution and hydrogen evolution reactions with superior activity and high stability, and hence also a promising candidate for application as a direct working electrode in future energy systems.
Co-reporter:Tian-Lu Cui, Xin-Hao Li, Li-Bing Lv, Kai-Xue Wang, Juan Su and Jie-Sheng Chen
Chemical Communications 2015 vol. 51(Issue 63) pp:12563-12566
Publication Date(Web):30 Jun 2015
DOI:10.1039/C5CC04837K
The Kirkendall effect was utilized to synthesize mesoporous silicalite-1 zeolite nanocrystals without the involvement of additional templates. The mesopore size as well as the particle size can be easily controlled by nanoscale Kirkendall growth via significantly reducing the amount of water or tetrapropylammonium hydroxide, which were used in large quantities in conventional methods. The Kirkendall growth method is thus suitable for large-scale synthesis of mesoporous MFI zeolites with very high yields but low cost for practical applications.
Co-reporter:Xiao Wei, Li-Na Han, Cheng-Yu Mao, De-Jun Wang, Xin-Hao Li, Ping-Yun Feng and Jie-Sheng Chen
Physical Chemistry Chemical Physics 2015 vol. 17(Issue 7) pp:5202-5206
Publication Date(Web):12 Jan 2015
DOI:10.1039/C4CP05166A
Two assemblies, porphyrin powder/ITO and porphyrin film/ITO, were built by a facile method. The time-resolved photovoltage technique was utilized to prove the behaviour of photo-induced charges in the two assemblies. The photovoltage results show that the porphyrin film/ITO assembly displays a reversal polarity response, which is different from the response of porphyrin powder/ITO. This phenomenon is due to the effect of a built-in field on photo-induced charge behaviour at the porphyrin film/ITO interface. This result is beneficial for the development of a measuring method for detecting heterojunction interface formation and understanding the photoelectric process in photoelectric materials and devices.
Co-reporter:Tian-Jian Zhao, Ya-Nan Zhang, Kai-Xue Wang, Juan Su, Xiao Wei and Xin-Hao Li
RSC Advances 2015 vol. 5(Issue 124) pp:102736-102740
Publication Date(Web):26 Nov 2015
DOI:10.1039/C5RA19869K
Cobalt nanoparticles containing both Co2+ and Co0 species supported on carbon nitride can function as heterogeneous nanocatalysts for a general transfer hydrogenation reaction in aqueous ammonia-borane solution at room temperature. The conversions of nitroarenes, olefins, imines, aldehydes, ketones and cyanobenzene are high with superior selectivity under mild conditions. This noble-metal-free catalyst is also cheap and reusable.
Co-reporter:Jie-Min Ge, Bing Zhang, Li-Bing Lv, Hong-Hui Wang, Tian-Nan Ye, Xiao Wei, Juan Su, Kai-Xue Wang, Xin-Hao Li, Jie-Sheng Chen
Nano Energy 2015 Volume 15() pp:567-575
Publication Date(Web):July 2015
DOI:10.1016/j.nanoen.2015.05.017
•Holey graphene monoliths (Nr-HGM) with the nitrogen content close to the theoretical upper limit.•Nr-HGM were fabricated via supramolecular assembly of dicyandiamide induced by ammonium sulfate.•Nr-HGM showed high porosity and high surface area .•Nr-HGM showed excellent alkaline HER activity, surpassing other metal-free carbon catalysts.Carbocatalysts with low cost and high stability are highly desirable to substitute expensive Pt-based materials for electrocatalysis. High conductivity, highly porous structure and high concentration of dopants are essential for efficient metal-free carbon-based electrocatalysts. Herein, a facile method was utilized to fabricate nitrogen-rich holey graphene monoliths (Nr-HGM) from cheap molecules and ammonium sulfate with the nitrogen content close to the upper limit of nitrogen-doped carbons. Our sample showed relatively high electrochemical catalytic activity and stability for hydrogen evolution reaction (HER) in both acid and base electrolytes, surpassing state-of-the-art metal-free HER catalysts in the literature.Open the window: hierarchical nitrogen-rich holey graphene monoliths (Nr-HGM) were prepared through a single-step approach from cheap molecules. Such a graphene network could act as highly efficient electrocatalyst with superb electrocatalytic activity and stability for hydrogen evolution reaction (HER) in both acid and alkaline electrolytes, outperforming the state-of-the-art metal-free catalysts in the literature.
Co-reporter:Tian-Nan Ye, Li-Bing Lv, Miao Xu, Bing Zhang, Kai-Xue Wang, Juan Su, Xin-Hao Li, Jie-Sheng Chen
Nano Energy 2015 Volume 15() pp:335-342
Publication Date(Web):July 2015
DOI:10.1016/j.nanoen.2015.04.033
•3D frameworks of graphene-carbon nanofiber paper coupled with defect-rich MoS2 nanosheets.•Large-area electrodes with superior HER performance and stability in both acid and basic medium.•Opening up a wide horizon of noble-metal-free HER catalysts for diverse practical usages.Design of large-area hybrid paper for directly using as electrodes in hydrogen evolution reaction (HER) can provide an efficient approach for the extension of electrochemical hydrogen industry. Here we construct MoS2 decorated hybrid carbon papers (MoS2-CPs) that consist of tiny MoS2 nanosheets coupled with 3D graphene–carbon nanofiber papers. MoS2-CPs can function as large-area working electrodes for HER with an overpotential (at 10 mA/cm2) of 80 mV in acid media and 186 mV in basic media, surpassing the Mo-based catalysts ever reported thus far in acid and basic solution respectively. It is the highly coupled interface of carbon frameworks and MoS2 components that resulted in the formation of patched and few-layer MoS2 nanosheets with rather small size and thus ensured the abundance of exposed active edge sites. Stability tests through long-term potential cycles and extended electrolysis confirm the outstanding durability of MoS2-CPs in both acid and basic electrolytes.
Co-reporter:Li-Bing Lv;Tian-Lu Cui;Bing Zhang;Hong-Hui Wang; Xin-Hao Li; Jie-Sheng Chen
Angewandte Chemie International Edition 2015 Volume 54( Issue 50) pp:
Publication Date(Web):
DOI:10.1002/anie.201509871
Co-reporter:Li-Bing Lv;Tian-Lu Cui;Bing Zhang;Hong-Hui Wang; Xin-Hao Li; Jie-Sheng Chen
Angewandte Chemie International Edition 2015 Volume 54( Issue 50) pp:15165-15169
Publication Date(Web):
DOI:10.1002/anie.201507074
Abstract
Superhydrophobic and superhydrophilic surfaces are of great interest because of a large range of applications, for example, as antifogging and self-cleaning coatings, as antibiofouling paints for boats, in metal refining, and for water–oil separation. An aqueous ink based on three-dimensional graphene monoliths (Gr) can be used for constructing both superhydrophobic and superhydrophilic surfaces on arbitrary substrates with different surficial structures from the meso- to the macroscale. The surface wettability of a Gr-coated surface mainly depends on which additional layers (air for a superhydrophobic surface and water for a superhydrophilic surface) are adsorbed on the surface of the graphene sheets. Switching a Gr-coated surface between being superhydrophobic and superhydrophilic can thus be easily achieved by drying and prewetting with ethanol. The Gr-based superhydrophobic membranes or films should have great potential as efficient separators for fast and gravity-driven oil–water separation.
Co-reporter:Li-Bing Lv;Tian-Lu Cui;Bing Zhang;Hong-Hui Wang; Xin-Hao Li; Jie-Sheng Chen
Angewandte Chemie 2015 Volume 127( Issue 50) pp:15380-15384
Publication Date(Web):
DOI:10.1002/ange.201507074
Abstract
Superhydrophobic and superhydrophilic surfaces are of great interest because of a large range of applications, for example, as antifogging and self-cleaning coatings, as antibiofouling paints for boats, in metal refining, and for water–oil separation. An aqueous ink based on three-dimensional graphene monoliths (Gr) can be used for constructing both superhydrophobic and superhydrophilic surfaces on arbitrary substrates with different surficial structures from the meso- to the macroscale. The surface wettability of a Gr-coated surface mainly depends on which additional layers (air for a superhydrophobic surface and water for a superhydrophilic surface) are adsorbed on the surface of the graphene sheets. Switching a Gr-coated surface between being superhydrophobic and superhydrophilic can thus be easily achieved by drying and prewetting with ethanol. The Gr-based superhydrophobic membranes or films should have great potential as efficient separators for fast and gravity-driven oil–water separation.
Co-reporter:Li-Bing Lv;Tian-Lu Cui;Bing Zhang;Hong-Hui Wang; Xin-Hao Li; Jie-Sheng Chen
Angewandte Chemie 2015 Volume 127( Issue 50) pp:
Publication Date(Web):
DOI:10.1002/ange.201509871
Co-reporter:Ling-Hong Gong, Yi-Yu Cai, Xin-Hao Li, Ya-Nan Zhang, Juan Su and Jie-Sheng Chen
Green Chemistry 2014 vol. 16(Issue 8) pp:3746-3751
Publication Date(Web):17 Jun 2014
DOI:10.1039/C4GC00981A
The facile conversion of olefins and unsaturated biomass to saturated compounds is achieved over heterogeneous catalysts composed of noble metal nanoparticles and carbon nitride. Reactions could proceed smoothly at room temperature in water using formic acid as the hydrogen source. The reusability of such a hybrid catalyst is high due to the strong Mott–Schottky effect between the metal nanoparticles and the carbon nitride support. The fast and automatic separation of the as-formed saturated hydrocarbons from water combined with the mild reaction conditions and the excellent reusability of catalysts make the catalytic process a highly “green” path for hydrogenation of unsaturated compounds and biofuel upgrading.
Co-reporter:Tian-Nan Ye, Miao Xu, Wei Fu, Yi-Yu Cai, Xiao Wei, Kai-Xue Wang, Yong-Nan Zhao, Xin-Hao Li and Jie-Sheng Chen
Chemical Communications 2014 vol. 50(Issue 23) pp:3021-3023
Publication Date(Web):28 Jan 2014
DOI:10.1039/C4CC00101J
Highly crystalline mesocrystalline BaZrO3 hollow nanospheres offered higher photocatalytic activities. It is found that the highly crystalline sample can function as a “highway” for electron transport with less grain boundaries, resulting in better charge separation and thus photocatalytic performance.
Co-reporter:Tian-Nan Ye;Li-Bing Lv; Xin-Hao Li;Miao Xu ; Jie-Sheng Chen
Angewandte Chemie International Edition 2014 Volume 53( Issue 27) pp:6905-6909
Publication Date(Web):
DOI:10.1002/anie.201403363
Abstract
Effective integration of one-dimensional carbon nanofibers (CNF) and two-dimensional carbon sheets into three-dimensional (3D) conductive frameworks is essential for their practical applications as electrode materials. Herein, a novel “vein-leaf”-type 3D complex of carbon nanofibers with nitrogen-doped graphene (NG) was prepared through a simple thermal condensation of urea and bacterial cellulose. During the formation of the 3D complex CNF@NG, the graphene species was tethered to CNF via carbon–carbon bonds. Such an interconnected 3D network facilitates both the electron transfer and mass diffusion for electrochemical reactions.
Co-reporter:Li-Na Han;Tian-Nan Ye;Li-Bing Lv;Kai-Xue Wang;Xiao Wei
Science China Materials 2014 Volume 57( Issue 1) pp:7-12
Publication Date(Web):2014 December
DOI:10.1007/s40843-014-0011-4
Supramolecular assemblies are introduced here as new-concept hard templates for the synthesis of hollow nanostructures (exemplified with TiO2 hollow nanostructures in this work). Supramolecular templates with tunable morphology and rich surface functional groups facilitate the tight coating of other materials for the formation of hollow nanostructures. The weak interaction between the supramolecules or micromolecules benefits the facile removal of the templates for large-scale synthesis of hollow nanostructures and also affords excellent template reusability. This method allows for the incorporation of various metal dopants into the TiO2 lattice, as a typical example of nanocatalyst, by introducing the corresponding metal salt as a dopant source. High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and UV-vis absorption spectroscopy investigations suggested substitution of Ti4+ sites by Co2+, which increased the activity of the catalytic sites in the doped materials, reducing the overpotential of TiO2 for the oxygen evolution reaction.超分子自组装化合物具有可调控的形貌和丰富的表面官能团. 超分子或小分子单体之间的弱相互作用有利于除去模板, 作为硬模板合成空心纳米结构(以TiO2为例), 不仅能得到具有可调控形貌的空心纳米结构, 并且超分子模板可以回收和重复利用. 实验表明, 用三聚氰氨和三聚氰酸作为原料合成的超分子模板, 有利于在模板表面复合无机组分, 并且模板中的氢键在水中易断裂, 因此可以通过透析方法除去模板得到空心纳米结构. 这种超分子模板法也可以用于合成掺杂金属离子的空心结构纳米催化剂, 进一步调控电子结构增加析氧反应的活性位点, 降低超电势. 更重要的是, 此模板合成方法简单、 耗能低、 可重复利用, 可以用于合成大批量的空心结构纳米催化剂.
Co-reporter:Tian-Nan Ye;Li-Bing Lv; Xin-Hao Li;Miao Xu ; Jie-Sheng Chen
Angewandte Chemie 2014 Volume 126( Issue 27) pp:7025-7029
Publication Date(Web):
DOI:10.1002/ange.201403363
Abstract
Effective integration of one-dimensional carbon nanofibers (CNF) and two-dimensional carbon sheets into three-dimensional (3D) conductive frameworks is essential for their practical applications as electrode materials. Herein, a novel “vein-leaf”-type 3D complex of carbon nanofibers with nitrogen-doped graphene (NG) was prepared through a simple thermal condensation of urea and bacterial cellulose. During the formation of the 3D complex CNF@NG, the graphene species was tethered to CNF via carbon–carbon bonds. Such an interconnected 3D network facilitates both the electron transfer and mass diffusion for electrochemical reactions.
Co-reporter:Yi-Yu Cai; Xin-Hao Li;Ya-Nan Zhang;Dr. Xiao Wei; Kai-Xue Wang ; Jie-Sheng Chen
Angewandte Chemie 2013 Volume 125( Issue 45) pp:12038-12041
Publication Date(Web):
DOI:10.1002/ange.201304652
Co-reporter:Yi-Yu Cai; Xin-Hao Li;Ya-Nan Zhang;Dr. Xiao Wei; Kai-Xue Wang ; Jie-Sheng Chen
Angewandte Chemie International Edition 2013 Volume 52( Issue 45) pp:11822-11825
Publication Date(Web):
DOI:10.1002/anie.201304652
Co-reporter:Li-Na Han, Li-Bing Lv, Qian-Cheng Zhu, Xiao Wei, Xin-Hao Li and Jie-Sheng Chen
Journal of Materials Chemistry A 2016 - vol. 4(Issue 20) pp:NaN7847-7847
Publication Date(Web):2016/04/21
DOI:10.1039/C6TA02143C
High energy density, low cost and ultra-stable bifunctional electrocatalysts that act simultaneously for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are important for commercializing the rechargeable Zn–air batteries. Co-doped TiO2 nanoparticles as an ultra-stable and cheap electrocatalyst exhibited excellent activity for both ORR and OER in alkaline media. A real air cathode made of the Co-doped TiO2 electrocatalyst further offered superior high energy density (778 mA h gZn−1 and 938.5 W h kgZn−1 at 5 mA cm−2, and 785.9 mA h gZn−1 and 911.3 W h kgZn−1 at 20 mA cm−2) and ultra-high stability (37 cycles for 750 h of operation at 20 mA cm−2 and 3150 cycles for 1050 h of operation at 5 mA cm−2) in two-electrode Zn–air batteries.
Co-reporter:Tian-Nan Ye, Wei-Jie Feng, Bing Zhang, Miao Xu, Li-Bing Lv, Juan Su, Xiao Wei, Kai-Xue Wang, Xin-Hao Li and Jie-Sheng Chen
Journal of Materials Chemistry A 2015 - vol. 3(Issue 26) pp:NaN13932-13932
Publication Date(Web):2015/05/27
DOI:10.1039/C5TA03485J
Proper disposal of waste paper is an important waste-management concern. We developed a facile and inexpensive method to transform waste paper into graphene-tethered carbon fiber composite paper (GCCP). Urea was the only additive for the carbonization of the GCCP. The as-obtained GCCP exhibited high electrical conductivity, and GCCP/polydimethyl siloxane (GCCP/PDMS) composites showed good stretchability with great electromechanical stability. The surface of the GCCP membrane was observed to be superhydrophobic; this property apparently endowed the membrane with the ability to separate oil from water in our experiments, which makes GCCP a promising candidate material for cleanup of oil spills. The hierarchical structure, N doping feature and low decoration with Pt make GCCP a potential electrocatalyst for oxygen reduction, oxygen evolution and hydrogen evolution reactions with superior activity and high stability, and hence also a promising candidate for application as a direct working electrode in future energy systems.
Co-reporter:Xiao Wei, Juan Su, Xin-Hao Li and Jie-Sheng Chen
Dalton Transactions 2014 - vol. 43(Issue 43) pp:NaN16177-16177
Publication Date(Web):2014/09/09
DOI:10.1039/C4DT02176B
A novel chemical “top-down” method has been employed to prepare tiny Fe3O4 nanobelts. Uniform Fe3O4 nanobelts were obtained by solvothermal reduction of exfoliated FeOCl layers with the assistance of high polar solvents and a PEO–PPO–PEO stabilizer. We also studied the superparamagnetic properties of Fe3O4 nanobelts, which exhibit a magnetic saturation value as high as ∼53 emu g−1 at room temperature and a magnetic anisotropy constant up to 6.6 × 104 erg cm−3. Furthermore the as-obtained product, which is amphiphilic and exhibits excellent dispersibility and redispersibility in most of the common solvents, could be readily used in various realms of biomedicine and biotechnology.
Co-reporter:Xiao Wei, Li-Na Han, Cheng-Yu Mao, De-Jun Wang, Xin-Hao Li, Ping-Yun Feng and Jie-Sheng Chen
Physical Chemistry Chemical Physics 2015 - vol. 17(Issue 7) pp:NaN5206-5206
Publication Date(Web):2015/01/12
DOI:10.1039/C4CP05166A
Two assemblies, porphyrin powder/ITO and porphyrin film/ITO, were built by a facile method. The time-resolved photovoltage technique was utilized to prove the behaviour of photo-induced charges in the two assemblies. The photovoltage results show that the porphyrin film/ITO assembly displays a reversal polarity response, which is different from the response of porphyrin powder/ITO. This phenomenon is due to the effect of a built-in field on photo-induced charge behaviour at the porphyrin film/ITO interface. This result is beneficial for the development of a measuring method for detecting heterojunction interface formation and understanding the photoelectric process in photoelectric materials and devices.
Co-reporter:Tian-Lu Cui, Li-Bing Lv, Wen-Bei Zhang, Xin-Hao Li and Jie-Sheng Chen
Catalysis Science & Technology (2011-Present) 2016 - vol. 6(Issue 14) pp:NaN5266-5266
Publication Date(Web):2016/06/06
DOI:10.1039/C6CY00379F
Mesoporous ZSM-5 nanocrystals with an optimized Si/Al ratio and mesoporosity were facilely synthesized without involving additional template in high yield, exhibiting high stability and high propylene selectivity for the methanol to propylene reaction. Kilogram-scale production of mesoporous ZSM-5 nanocrystals ensured their possible applications as catalysts in industry.
Co-reporter:Tian-Lu Cui, Xin-Hao Li, Li-Bing Lv, Kai-Xue Wang, Juan Su and Jie-Sheng Chen
Chemical Communications 2015 - vol. 51(Issue 63) pp:NaN12566-12566
Publication Date(Web):2015/06/30
DOI:10.1039/C5CC04837K
The Kirkendall effect was utilized to synthesize mesoporous silicalite-1 zeolite nanocrystals without the involvement of additional templates. The mesopore size as well as the particle size can be easily controlled by nanoscale Kirkendall growth via significantly reducing the amount of water or tetrapropylammonium hydroxide, which were used in large quantities in conventional methods. The Kirkendall growth method is thus suitable for large-scale synthesis of mesoporous MFI zeolites with very high yields but low cost for practical applications.
Co-reporter:Tian-Nan Ye, Miao Xu, Wei Fu, Yi-Yu Cai, Xiao Wei, Kai-Xue Wang, Yong-Nan Zhao, Xin-Hao Li and Jie-Sheng Chen
Chemical Communications 2014 - vol. 50(Issue 23) pp:NaN3023-3023
Publication Date(Web):2014/01/28
DOI:10.1039/C4CC00101J
Highly crystalline mesocrystalline BaZrO3 hollow nanospheres offered higher photocatalytic activities. It is found that the highly crystalline sample can function as a “highway” for electron transport with less grain boundaries, resulting in better charge separation and thus photocatalytic performance.
