Co-reporter:Dandan Wu, Ming Wen, Chen Gu, and Qingsheng Wu
ACS Applied Materials & Interfaces May 17, 2017 Volume 9(Issue 19) pp:16103-16103
Publication Date(Web):May 5, 2017
DOI:10.1021/acsami.7b00652
An economical catalyst with excellent selectivity and high activity is eagerly desirable for H2 generation from the decomposition of N2H4·H2O. Here, a bifunctional two-dimensional NiFe/CeO2 nanocatalyst with NiFe nanoparticles (∼5 nm) uniformly anchored on CeO2 nanosheets supports has been successfully synthesized through a dynamic controlling coprecipitation process followed by in-situ topotactic reduction. Even without NaOH as catalyst promoter, as-designed Ni0.6Fe0.4/CeO2 nanocatalyst can show high activity for selectively catalyzing H2 generation (reaction rate (molN2H4 mol–1NiFe h–1): 5.73 h–1). As ceria is easily reducible from CeO2 to CeO2–x, the surface of CeO2 could supply an extremely large amount of Ce3+, and the high-density electrons of Ce3+ can work as Lewis base to facilitate the absorption of N2H4, which can weaken the N–H bond and promote NiFe active centers to break the N–H bond preferentially, resulting in the high catalytic selectivity (over 99%) and activity for the H2 generation from N2H4·H2O.Keywords: H2 generation; Lewis base; N2H4·H2O decomposition; selectively catalyze; two-dimensional NiFe/CeO2;
Co-reporter:Shipei Chen, Qingnan Wu, Ming Wen, Chenxiang Wang, Qingsheng Wu, Jiahao Wen, Meng Zhu, and Yansen Wang
The Journal of Physical Chemistry C May 11, 2017 Volume 121(Issue 18) pp:9719-9719
Publication Date(Web):May 2, 2017
DOI:10.1021/acs.jpcc.7b01551
Development of highly stabile battery-type electrode materials with superior capacity has been a critical challenge for hybrid supercapacitors. We report a high-performance electrode material, tubular sandwich-structured CNT@Ni@Ni2(CO3)(OH)2, synthesized via a scalable, dynamic, controlled in situ reduction–chemical deposition process. Applied as a battery-type electrode material, this novel nanostructure exhibits excellent electrochemical stability, majorly attributed to the Ni midshell serving a dual role as “capacity supplement” and “electron highway”, which, to our knowledge, was incorporated into the nanocomposite electrodes for the first time. Also benefiting from the high conductivity of carbon nanotubes (CNTs) and the high capacity of the amorphous NiOOH ultrathin film [converted from the Ni2(CO3)(OH)2 outer shell], the resulting CNT@Ni@Ni2(CO3)(OH)2 material as a battery-type electrode achieves a superior capacity of 221 mAh·g–1 at 5 A·g–1 with 76% capacity retention at 50 A·g–1 and maintains 81% capacity after 9000 cycles at 5 A·g–1. An advanced aqueous hybrid supercapacitor using activated carbon and CNT@Ni@Ni2(CO3)(OH)2 nanocomposite as the negative and positive electrodes, respectively, delivers a high energy density of 179 Wh·kg–1 at a power density of 2880 W·kg–1 with capacitance retention in excess of 85% over 5500 cycles. The outstanding performance demonstrates its practical potential in advanced hybrid supercapacitors.
Co-reporter:Dandan Wu, Yanqiao Zhang, Ming Wen, Hao Fang, and Qingsheng Wu
Inorganic Chemistry May 1, 2017 Volume 56(Issue 9) pp:5152-5152
Publication Date(Web):April 20, 2017
DOI:10.1021/acs.inorgchem.7b00304
To meet the requirement of high catalytic efficiency toward the reduction of p-nitrophenyl compounds, we designed a new one-dimensional Fe3O4/FeNi embedded-nanostructured catalyst synthesized by a one-pot controlling-growth-reduction process in a solvothermal system, in which Fe3O4 phase was implanted in the base of FeNi alloy. In the Fe3O4/FeNi catalyst system, the Fe3O4 embedded phase attracts the nitro group of p-nitrophenyl compounds by its high-density electrons, which can efficiently promote the activity of amorphous FeNi active centers for selective catalysis toward the reduction of a range of p-nitrophenyl compounds. Moreover, for the para-group in the nitrophenyl compounds, an increasing electron-donating power contributes to a higher catalytic activity, while electron-withdrawing power obtains the reverse case. Additionally, the Fe3O4/FeNi composite nanocatalyst exhibited an outstanding cycling performance over 20 times without obvious performance decay. This work opens an avenue to design more powerful non-noble metal catalysts for green chemistry.
Co-reporter:Hao Fang;Yuting Chen;Qingsheng Wu;Quanjing Zhu
Nano Research 2017 Volume 10( Issue 11) pp:3929-3940
Publication Date(Web):08 August 2017
DOI:10.1007/s12274-017-1745-6
A desirable methanol oxidation electrocatalyst was fabricated by metal atom diffusion to form an alloy of an assembled three-dimensional (3D) radial nanostructure of SnNi nanoneedles loaded with SnNiPt nanoparticles (NPs). Herein, metal atom diffusion occurred between the SnNi support and loaded Pt NPs to form a SnNiPt ternary alloy on the catalyst surface. The as-obtained catalyst combines the excellent catalytic performance of the alloy and advantages of the 3D nanostructure; the SnNiPt NPs, which fused on the surface of the SnNi nanoneedle support, can dramatically improve the availability of Pt during electrocatalysis, and thus elevate the catalytic activity. In addition, the efficient mass transfer of the 3D nanostructure reduced the onset potential. Furthermore, the catalyst achieved a favorable CO poisoning resistance and enhanced stability. After atomic interdiffusion, the catalytic activity drastically increased by 45%, and the other performances substantially improved. These results demonstrate the significant advantage and enormous potential of the atomic interdiffusion treatment in catalytic applications.
Co-reporter:Hao Fang, Ming Wen, Hanxing Chen, Qingsheng Wu and Weiying Li
Nanoscale 2016 vol. 8(Issue 1) pp:536-542
Publication Date(Web):08 Dec 2015
DOI:10.1039/C5NR05016B
Nowadays, it is of great significance and a challenge to design a noble-metal-free catalyst with high activity and a long lifetime for the reduction of aromatic nitro-compounds. Here, a 2D structured nanocomposite catalyst with graphene supported CuNi alloy nanoparticles (NPs) is prepared, and is promising for meeting the requirements of green chemistry. In this graphene/CuNi nanocomposite, the ultra-small CuNi nanoparticles (∼2 nm) are evenly anchored on graphene sheets, which is not only a breakthrough in the structures, but also brings about an outstanding performance in activity and stability. Combined with a precise optimization of the alloy ratios, the reaction rate constant of graphene/Cu61Ni39 reached a high level of 0.13685 s−1, with a desirable selectivity as high as 99% for various aromatic nitro-compounds. What's more, the catalyst exhibited a unprecedented long lifetime because it could be recycled over 25 times without obvious performance decay or even a morphology change. This work showed the promise and great potential of noble-metal-free catalysts in green chemistry.
Co-reporter:Dandan Wu, Ming Wen, Xijian Lin, Qingsheng Wu, Chen Gu and Hanxing Chen
Journal of Materials Chemistry A 2016 vol. 4(Issue 17) pp:6595-6602
Publication Date(Web):15 Apr 2016
DOI:10.1039/C6TA01092J
The exploration of non-noble-metal recyclable catalysts for high efficiency H2 generation from N2H4·H2O is of great significance for the sustainable strategy of society. A NiCo/NiO–CoOx ultrathin layered catalyst was fabricated successfully via a dynamics controlling coprecipitation–reduction (DCCR) process followed by calcination and applied to H2 generation from N2H4·H2O. Small nanosized NiCo particles (∼4 nm) were uniformly anchored on the surface of the NiO–CoOx ultrathin layered supports. Based on the cooperation between the NiCo active-centers and high intensity base-sites of the NiO–CoOx support, the Ni70Co30/NiO–CoOx ultrathin layered nanocomposite exhibits over 99% selectivity for H2 generation from N2H4·H2O with a high reaction rate (molN2H4 molNiCo−1 h−1) of 5.49 h−1 without using alkali as a catalyst promoter at 25 °C, which is superior to the reported studies. Moreover, the NiCo nanoalloys loading on the NiO–CoOx sheets enables an outstanding recycle performance over 10 cycles. The non-noble-metal NiCo/NiO–CoOx layered nanocomposite shows great value in catalyzing H2 generation from N2H4·H2O in practical applications.
Co-reporter:Xiaomeng Li, Ming Wen, Dandan Wu, Qingsheng Wu, Jiaqi Li
Journal of Alloys and Compounds 2016 Volume 685() pp:42-49
Publication Date(Web):15 November 2016
DOI:10.1016/j.jallcom.2016.05.008
•This is the first report about the noble metal NPs supported on alloys nanosheets.•The catalysts exhibit such fantastic catalytic performance towards MOR.•The 2D Pd-on-NiCu nanosheets largely increase the atomic efficiency of Pd.•Pd-on-NiCu nanosheets exhibit an outstanding performance for the MOR in alkaline media.For the exploration of catalysts with excellent performance in alkaline fuel cells, high-performance two-dimensional (2D) Pd-on-NiCu nanosheets were synthesized through the kinetics controlling synthesis of NiCu nanosheets followed by Pd nanoparticles (NPs) embedding treatment at room temperature. In which case, well-dispersed Pd NPs with the average diameter of ∼4 nm are embedded on NiCu nanosheets (BET surface area of 180.7 m2g−1). Pd-on-NiCu nanosheets exert remarkable high performance in electrocatalytic activity, methanol-tolerance and stability, the electrocatalytic mass activity of Pd-on-NiCu nanosheets is 1827 mAmg−1, which is over 6-fold higher than that of commercial Pd/C (289 mAmg−1), and the current density of the electrocatalyst decreases after 300 cycles of only 6%. Therefore, Pd-on-NiCu nanosheets can be considered as one of the most promising candidates for fuel cells applications.High-performance Pd-on-NiCu nanosheets obtained via kinetic process and self-assembly exhibited remarkably enhanced electrocatalytic activities for the methanol oxidation reaction in alkaline media. This is the first report about the noble metal NPs supported on alloys nanosheets.
Co-reporter:Chenxiang Wang 王辰祥;Jie Wang 王杰;Hanxing Chen 陈翰星 温鸣
Science China Materials 2016 Volume 59( Issue 11) pp:927-937
Publication Date(Web):2016 November
DOI:10.1007/s40843-016-5086-7
An interlayer nanostructure of rGO/Sn2Fe-NRs array/rGO was synthesized via a versatile integration of Sn2Fe nanorods (NRs) array in between reduced graphene oxide (rGO) nanosheets. Impressively, as an anode material for lithium ion batteries, the as-prepared nanocomposites deliver a high specific capacity of 690 mA h g−1 at a current density of 0.5 C (500 mA g−1), and 582 mA h g−1at 1 C (1000 mA g−1) with exceptional rate capability and cycling stability over 600 cycles. These significantly improved electrochemical properties benefit from the high structural stability and electrical conductivity of rGO/Sn2Fe-NRs array/rGO interlayer nanostructures. It is demonstrated that the designed interlayer nanostructures are outstanding architectures for lithium ion battery anodes.基于阵列夹层纳米结构的稳定性和石墨烯的电子传递特性, 本文通过原位生长的层间组装过程, 获得了一类新型的rGO/Sn2Fe-NRs 阵列/rGO层间纳米结构复合材料. 该结构中, Sn2Fe纳米合金棒阵列排布于rGO纳米层之间. 将此材料应用于锂离子电池负极, 可以促进电 极反应中的物质传输, 并能有效避免副反应产生, 从而表现出优异的倍率性和循环稳定性, 并在高电流密度下保持高比容量. 在电流密度分 别为0.5 C (500 mA g−1)和1 C (1000 mA g−1)时, 比容量分别达到690 mA h g−1和582 mA h g−1. 本工作对促进电化学性能优异的锂离子电池负极 材料发展具有重要的意义.
Co-reporter:Hanxing Chen, Ming Wen, Zaidi Huang, Qingsheng Wu, Jiali Liu and Teng Tu
Journal of Materials Chemistry A 2015 vol. 3(Issue 2) pp:600-607
Publication Date(Web):10 Nov 2014
DOI:10.1039/C4TA05204H
Highly active Cu@ZnO brush-like nanostructures have been successfully synthesized through the heteroepitaxial growth process of ZnO branched nanorods (NRs) based on Cu core nanowires (NWs), and used for the evaluation of selective catalytic degradation for polycyclic aromatic compounds. The resultant Cu@ZnO nanobrushes, with the main diameter of ∼500 nm, consist of Cu core NWs with diameter of ∼50 nm and outer ZnO branch NRs shells with thickness of ∼250 nm. The as-designed Cu@ZnO nanobrushes exhibit high performance for the selective catalytic degradation of polycyclic aromatic compounds. Nearly 90% conversion with the reaction rate constant (k) of 0.012 min−1 can be achieved for anthracene, while only about 50% and 10% conversions are shown for phenanthrene and naphthalene, respectively. Besides the highly efficient transportation of electrons, Cu NWs have strong capacity for oxygen activation which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface, which is responsible for the high catalytic efficiency of Cu@ZnO nanobrushes toward the selective degradation of anthracene.
Co-reporter:Hanxing Chen, Teng Tu, Ming Wen and Qingsheng Wu
Dalton Transactions 2015 vol. 44(Issue 35) pp:15645-15652
Publication Date(Web):06 Aug 2015
DOI:10.1039/C5DT01393C
New Cu2O-on-Cu nanowires (NWs) are constructed to develop the visible-light-driven activity of photocatalysts via the facile self-assembly of Cu2O nanoparticles (NPs) on a Cu NW surface assisted by a structure director, followed in situ reduction. In the resultant Cu2O-on-Cu NWs, the Cu2O NPs, with a diameter of 10 nm, show good distribution on the 50 nm-sized Cu single-crystal NWs. Owing to the band-gap adjusting effect and high electron transportation, the coupling of narrow-band-gap semiconductor Cu2O and excellent conductor Cu can lead to the markedly enhanced high visible light photocatalytic activity of Cu2O-on-Cu NWs toward the degradation of dye pollutants including Rhodamine B (RhB), methyl orange (MO) and methyl blue (MB). The as-designed Cu2O-on-Cu heterostructured NWs exhibit higher performance for the catalytic degradation of dye compounds than pure Cu2O. Nearly 60%, 100%, and 85% conversion with reaction rate constants (k) of 0.0137, 0.0746 and 0.0599 min−1 can be achieved for the degradation of RhB, MO and MB, respectively. Besides the highly efficient transportation of electrons, Cu NWs have a strong capacity for oxygen activation, which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface. This may be responsible for the high catalytic efficiency of the Cu2O-on-Cu NWs toward the degradation of organic pollutants.
Co-reporter:Zaidi Huang, Ming Wen, Dandan Wu and Qingsheng Wu
RSC Advances 2015 vol. 5(Issue 16) pp:12261-12267
Publication Date(Web):23 Dec 2014
DOI:10.1039/C4RA14459G
A special Ag/AgCl network-nanostructure was synthesized based on a Ag nanowire (NW) or nanosphere template through the element lithographic network construction process. The structure of obtained Ag/AgCl is a 3D nanoscale network-structure that consists of the network NWs with the average diameter of ∼20 nm and porous channels with narrow macropore distribution from 50 to 100 nm. As-designed network-nanostructures not only provide firm frame support for the active sites, but also offer large surface areas and numerous reaction performance chambers, and consequently greatly facilitate reactant diffusion and transport. Employed as UV-driven plasmonic photocatalysts, the formulated Ag/AgCl nano-networks exhibit excellent performance and stability for the selective degradation of chlorophenol contaminants. Compared with the commercial P25-TiO2, the prepared Ag/AgCl network-nanostructures show considerably higher photocatalytic activity, in which the network-structured nanospheres are better than network-structured NWs toward the selective degradation of 4-chlorophenol with the reaction rate constant of 0.28 min−1, suggesting good potential application for organic pollutant elimination.
Co-reporter:Linyi Zhou, Ming Wen, Qingsheng Wu and Dandan Wu
Dalton Transactions 2014 vol. 43(Issue 21) pp:7924-7929
Publication Date(Web):25 Feb 2014
DOI:10.1039/C4DT00052H
Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core–shell-structured nanocables with Ni nanoparticles (NPs) attached on FeNi nanorods (NRs) surface loosely. The catalytic reactivity monitored by means of a UV-vis dynamic process shows FeNi@Ni nanocables can catalyse the transformation of p-nitrophenol to p-aminophenol completely under an ambient atmosphere at room temperature, and enable the catalysis to be more efficient than its counterparts FeNi NRs and Ni NPs due to the interfacial synergistic effect. Additionally, the resultant hierarchical metal–alloy nanocomposites possess ferromagnetic behaviour, and can be easily separated and recycled by an external magnet field for application.
Co-reporter:Ming Wen, Qingnan Wu, Jin Peng, Qingsheng Wu, Chenxiang Wang
Journal of Colloid and Interface Science 2014 Volume 416() pp:220-226
Publication Date(Web):15 February 2014
DOI:10.1016/j.jcis.2013.10.056
•NiCo/Pt nanoball chains have been synthesized through hierarchical process.•The product presents exceedingly high catalytic activity.•The product has low activation energy of 45.72 kJ mol−1.•The product presents superior dehydrogenation rate of 1.17 × 104 mL min−1 g−1.•The catalysts can be recycled easily by externally applied magnetic field.A new magnetic Pt-loaded NiCo nanochain, with the diameter from 80 nm to 120 nm, has been prepared through microwave-induced assembly process followed by the galvanic displacement performance. Pt nanoparticles are distributed on the surface of NiCo nanochains. The products are investigated as hydrolytic dehydrogenation catalyst for potential hydrogen energy applications. Compared with NiCo nanochains, the Pt-loaded NiCo nanochains present exceedingly high catalytic activity toward the hydrolytic dehydrogenation of ammonia borane aqueous under ambient atmosphere at room temperature, where the Ni16Co80/Pt4 nanochains exhibit high catalytic activity with a lower activation energy of 45.72 kJ mol−1 and a superior dehydrogenation rate of 1.17 × 104 mL min−1 g−1, suggesting the potential application in hydrogen fuel and chemical industry.
Co-reporter:Hanxing Chen, Linyi Zhou, Ming Wen, Qingsheng Wu, Chenxiang Wang
Materials Research Bulletin 2014 60() pp: 322-327
Publication Date(Web):
DOI:10.1016/j.materresbull.2014.08.020
Co-reporter:Yan-ge Wu ; Ming Wen ; Qing-sheng Wu ;Hao Fang
The Journal of Physical Chemistry C 2014 Volume 118(Issue 12) pp:6307-6313
Publication Date(Web):March 13, 2014
DOI:10.1021/jp412711b
Two-dimensional (2D) heterostructured Ni/graphene nanocomposites were constructed via electrostatic-induced spread by following in situ-reduction growth process for magnetically recyclable catalysis of p-nitrophenol to p-aminophenol. The heterostructures with large 2D surface and moderate inflexibility enable the superior catalytic activity and selectivity toward hydrogenation reaction for p-nitrophenol. On the basis of high-efficiency utilization of Ni Nps catalysis activity and electron-enhanced effect from graphene, the coupling effect of Ni/graphene magnetic nanocomposites can lead to highly catalytic activity for the hydrogenation reaction of p-nitrophenol with the pseudo-first-order rate constants of 11.7 × 10–3 s–1, which is over 2-fold compared to Ni Nps (5.45 × 10–3 s–1) and higher than reported noble metal nanocomposites. Complete conversion of p-nitrophenol was achieved with selectivity to p-aminophenol as high as 90% under atmosphere and room temperature. Additionally, this heterostructured magnetic nanocatalyst can be efficiently recycled with long lifetime and stability over 10 successive cycles. This work displayed the value of non-noble metal/graphene nanocomposites in catalysts development for green chemistry.
Co-reporter:Ming Wen ; Bo Zhou ; Hao Fang ; Qingsheng Wu ;Shipei Chen
The Journal of Physical Chemistry C 2014 Volume 118(Issue 46) pp:26713-26720
Publication Date(Web):November 5, 2014
DOI:10.1021/jp507138z
An approach has been explored to highly improve the catalytic activity and stability for methanol oxidation reaction (MOR) by using dominant α-(NiCu)3Pd phase-structural NiCuPd nanoparticles (NPs) as anode catalysts. The NiCuPd alloy NPs are monodispersed with the diameter of ∼10 nm and have been prepared by the reduction of Pd(acac)2, Ni(acac)2, and Cu(acac)2 following alloying growth process. In the Ni–Cu–Pd alloy system, Ni atoms fused in Cu3Pd phase to form α-(NiCu)3Pd phase together with NiCuPd solid solution phase. As Ni concentration gradually enriched, the crystallinity of α-(NiCu)3Pd became higher, while its percentage decreased by one degree. Owing to the synergistic effect between components and facet atom arrangement, the catalytic activity and stability of NiCuPd NPs can be adjusted toward the MOR in alkaline media. The maximized crystallinity of α-(NiCu)3Pd results in the largest catalytic activity. Compared with commercial Pd/C with (111) facets, α-(NiCu)3Pd phase with (117) facets afforded a more open-atom arrangement surface and exhibited the remarkable catalytic activity and stability. Containing maximized crystallinity of α-(NiCu)3Pd, Ni63Cu12Pd25 NP-modified electrode, afforded the highest catalytic activity (333 mA·mg–1) toward the MOR, which is about 2.5 times higher than that of the commercial Pd/C-modified one (145 mA·mg–1). Combining the advantages of high electrochemical activity, stability, and economical effectiveness, the novel phase of α-(NiCu)3Pd has great potential as an anode catalyst for methanol fuel cells.
Co-reporter:Bo Zhou, Ming Wen and Qingsheng Wu
Nanoscale 2013 vol. 5(Issue 18) pp:8602-8608
Publication Date(Web):20 Jun 2013
DOI:10.1039/C3NR01614E
Magnetic C-isolated Ag–C–Co sandwich sphere nanostructures have been fabricated through a synchronous growth and assembly process, in which the outer Co sphere-shells assemble around the surface of synchronously grown Ag–C sphere-cores. Raman and UV-vis absorption spectroscopy studies show that the covering of Co shell on Ag–C sphere cores weakens the surface-enhanced Raman scattering (SERS) and surface plasmon resonance (SPR) of Ag–C sphere cores. Owing to its ferromagnetic behaviour, the as-prepared C-isolated Ag–C–Co sandwich nanospheres can be easily separated and recycled by an external magnet field for application. Compared with Ag–Co, C–Co, and Co nanospheres of the same size, the resultant magnetic Ag–C–Co sandwich nanospheres exhibit markedly high catalytic activity toward ammonia borane hydrolytic dehydrogenation at atmospheric pressure and room temperature, which is induced by SPR from C-isolated sandwich structural and electronic synergistic effects.
Co-reporter:Ming Wen, Yuzhen Sun, Xiaomeng Li, Qingsheng Wu, Qingnan Wu, Chenxiang Wang
Journal of Power Sources 2013 Volume 243() pp:299-305
Publication Date(Web):1 December 2013
DOI:10.1016/j.jpowsour.2013.05.190
•Newly designed Ru-capped/FeCo nanoflowers are reported in this work.•Ru-capped/FeCo nanoflowers exhibit high catalytic dehydrogenation of NaBH4.•The Ru-capped/FeCo nanoflowers can be recovered and recycled.•Ru-capped/FeCo nanoflowers have potential applications in hydrogen energy.Magnetic Ru-capped/FeCo nanoflowers are solvothermally synthesised through a self-catalytic growth and assembly process. The synthesised Ru-capped/FeCo nanoflowers (∼3.63 μm) consist of Ru-capped FeCo nanorods with an average diameter of ∼13 nm and a length ranging from 1.33 to 2.1 μm. A vibration sample magnetometer measurement reveals that the ferromagnetic behaviours depend on nanomaterial composition. Particularly, an appropriate quantity of Fe in the composition improved catalytic activity. The Fe22Co73/Ru5 nanoflowers exhibits the highest catalytic activity towards NaBH4 hydrolytic dehydrogenation at ambient pressure and room temperature (the dehydrogenation rate is 4293.75 mL min−1 g−1; the activation energy is 42.95 kJ mol−1).New, recyclable, magnetic Ru-capped/FeCo nanoflowers obtained solvothermally via self-catalysed growth and assembly exhibit high catalytic efficiency for NaBH4 hydrolytic dehydrogenation at ambient pressure and room temperature.Figure optionsDownload full-size imageDownload as PowerPoint slide
Co-reporter:Ming Wen, Shiqing Zhou, Qingsheng Wu, Juyang Zhang, Qingnan Wu, Chenxiang Wang, Yuzhen Sun
Journal of Power Sources 2013 Volume 232() pp:86-92
Publication Date(Web):15 June 2013
DOI:10.1016/j.jpowsour.2012.12.070
New NiCo–Pt nanopolyhedron inlay-structures with an average diameter of ∼450 nm have been synthesized through replacement deposition Co or Ni by reductive replacement with a Pt submonolayer (galvanic replacement) on NiCo hexagonal nanoplates and nanoicosahedrons. The resultant products are investigated as hydrolytic dehydrogenation catalyst for potential hydrogen energy applications. The NiCo–Pt nanopolyhedrons exhibit higher catalytic activity than NiCo nanopolyhedrons for the hydrolysis of borane in aqueous ammonia borane at ambient atmosphere and room temperature. In particular, the NiCo–Pt hexagonal nanoplates exhibit efficient catalytic activity with a lower activation energy of 45.72 kJ mol−1 than that (49.4 kJ mol−1) for NiCo.Graphical abstractNew designed NiCo–Pt nanopolyhedrons inlay-structures, synthesized by galvanic replacement method, exhibit exceedingly high catalytic activity to dehydrogenation toward boron hydride under moderate conditions due to the cooperation of high proportional active crystal surface and inlay-heterostructures. This excellent function empowers the potential of the product for its possible application on energy source and chemical industry.Highlights► New designed NiCo–Pt nanopolyhedron inlay-structures have been firstly reported in this work. ► NiCo–Pt hexagonal-nanoplates exhibit exceedingly high dehydrogenation catalytic activity. ► NiCo–Pt magnetic nanopolyhedrons can be separated and recovered for recyclable use. ► As-obtained NiCo–Pt nanopolyhedrons have the potential application in energy source.
Co-reporter:Jin Peng, Ming Wen, Chenxiang Wang, Qingsheng Wu and Yuzhen Sun
Dalton Transactions 2013 vol. 42(Issue 24) pp:8667-8673
Publication Date(Web):19 Mar 2013
DOI:10.1039/C3DT33018D
A three-dimensional (3D) broom-like nanostructured magnetic FeNi catalyst was synthesized using inexpensive Fe and Ni as precursors in a controllable microwave-assisted route. In this 3D broom-like nanostructure, the length of an FeNi nanorod, which serves as a building block, depends on the molar content of Fe. With a decrease in the Fe content from 100 to 45% in the FexNi96−x system, the length varies from 8 μm to 1 μm, which is corroborated by SEM, TEM, XRD, EDS and XPS. The magnetic behavior measurement results show that the magnetic saturation and coercivity are strongly influenced by the length of the nanorods and the Fe content. The sample of Fe nanorods gives a maximum magnetization saturation at 196 emu g−1, and a maximum coercivity of 241.23 Oe is obtained for Fe78Ni22. These economical 3D FeNi broom-like nanostructures, with large surface areas and dispersed active sites, can dramatically facilitate the diffusion and transportation of a reactant to improve the reactivity. In particular, Fe89Ni11 broom-like nanostructures exert an excellent reactivity towards the reductive dechlorination of 1,1,2,2-tetrachloroethane.
Co-reporter:Na Wang, Ming Wen, Qingsheng Wu
Colloids and Surfaces B: Biointerfaces 2013 Volume 111() pp:726-731
Publication Date(Web):1 November 2013
DOI:10.1016/j.colsurfb.2013.06.012
•Amorphous FeNi–Pt fan-shaped nanostructure was synthesized through classical hydrothermal method.•The as-synthesized nanoalloy loaded with GOD was used as electrode material.•The electrode materials exhibited an excellent catalytic activity for GOD.Glucose oxidase (GOD) loaded amorphous FeNi–Pt fan-shaped nanostructures with the average length of ∼7 μm have been synthesized for improving the electrochemical activity of enzyme electrode materials. The electrochemical oxidation of glucose solution has been successfully facilitated using FeNi–Pt fan-shaped nanostructures to load GOD due to their fan-shaped constitution and amorphous nanostructure. Chitosan could provide better response of nanostructure electrode than nafion. Compared with glassy carbon electrode (GCE) modified by chitosan/Fe40Ni40–Pt20/GOD/GCE (GOD-loaded Fe40Ni40–Pt20 nanoalloys using chitosan as immobilization-agent), chitosan/Fe45Ni45–Pt10/GOD/GCE presents smaller oxidation and reduction peak potential separation at 0.2912 V. No any electrochemical response can be observed when FeNi–Pt was absent in this electrode system. Additionally, a group of parallel experiments were tested when chitosan was changed to nafion. When Fe40Ni40–Pt20 nanostructure was employed to the electrode system, the oxidation and reduction peaks potentials were −0.7341 V and −0.4943 V, respectively, with a peak potential separation of 0.3371 V.
Co-reporter:Yuzhen Sun; Ming Wen; Qingsheng Wu;Qingnan Wu
ChemPlusChem 2013 Volume 78( Issue 4) pp:375-381
Publication Date(Web):
DOI:10.1002/cplu.201200297
Abstract
Novel, urchinlike FeNi–Ru(tips) hierarchical-structured nanospheres (≈9.17 µm) were constructed through a controllable assembly process. Offering large surface areas and macropores as well as more active sites, this special structured catalyst can greatly facilitate reactant diffusion and transport to promote reactivity. By combining the advantages of Ru and FeNi nanomaterials, the resultant urchinlike FeNi–Ru(tips) nanospheres exhibit excellent catalytic activity with the dehydrogenation rate of 2245.87 mL min−1 g−1 toward the hydrolytic dehydrogenation of aqueous NaBH4 under ambient atmosphere at room temperature, in which Fe19Ni76–Ru5 shows the best dehydrogenation reactivity with low activation energy (41.57 kJ mol−1). Additionally, these new structured nanoalloys present controllable ferromagnetic behavior by means of adjusting the molar content of Fe, Ni, and Ru.
Co-reporter:Li-Zu Wang; Ming Wen;Dr. Pin-Shi Yuan;Linyi Zhou; Qing-Sheng Wu
ChemPlusChem 2013 Volume 78( Issue 8) pp:816-822
Publication Date(Web):
DOI:10.1002/cplu.201300058
Abstract
A new strategy for the one-step synthesis of multifunctional porous-C/Fe3O4 nanospheres has been successfully developed by using ferrocenyl formic acid as a precursor. Based on its special structure, this sandwich structural precursor of ferrocenyl formic acid plays three roles in the synthesis process: it simultaneously serves as the carbon and iron source, templating agent, and pore-forming agent. The proposed synthesis is corroborated by characterization through SEM, TEM, XRD, FTIR spectroscopy, Raman spectroscopy, BET surface area measurements, BJH distributions, and vibrating sample magnetometry. The average diameter of as-synthesized porous-C/Fe3O4 nanospheres is about 400 nm. Because of the porous structure of carbon nanospheres and its surface plasmon resonance with attached Fe3O4 nanoparticles, the as-synthesized porous-C/Fe3O4 nanospheres exhibit high activity toward the decoloration of rhodamine B. In addition, the resultant composites present ferromagnetic behavior with a magnetization saturation of 13.76 emu g−1, can be easily separated and recycled by an external magnet field for use in a variety of applications.
Co-reporter:Baolei Sun;Qingsheng Wu;Jin Peng
Advanced Functional Materials 2012 Volume 22( Issue 13) pp:2860-2866
Publication Date(Web):
DOI:10.1002/adfm.201200274
Abstract
Magnetic double-shelled Ag@C@Co pentagonalprism nanocables are fabricated using a synchronous growth and oriented assembly process, in which the second shell of Co is arranged along the edges of Ag@C pentagonalprism nanowires (NWs). The resulting Ag@C@Co pentagonalprism nanocables exhibit an average diameter of ≈400 nm and consist of Ag core NWs with diameter of ≈200 nm and C middle layers with a thickness of ≈10 nm as well as outer Co shells with a thickness of ≈100 nm. UV-vis absorption spectroscopy shows that the Co shell on Ag@C NWs can damp the surface plasmon resonance (SPR) of the Ag core wires and lead to a red-shifted SPR absorption peak. Additionally, the Ag@C@Co nanocables have the ferromagnetic behavior, which can be controlled by modulating the shell density. The resulting magnetic Ag@C@Co nanocables exert excellent selected catalytic activity along the edges toward the dehydrogenation of ammonia borane aqueous under ambient conditions at room temperature.
Co-reporter:Ming Wen, Baolei Sun, Bo Zhou, Qingsheng Wu and Jin Peng
Journal of Materials Chemistry A 2012 vol. 22(Issue 24) pp:11988-11993
Publication Date(Web):11 May 2012
DOI:10.1039/C2JM31311A
Double-shelled Ag/C/Ni nanocables have been synthesized through a deposition covering process of Ni nanoparticles (NPs) onto Ag/C pentagonal prism nanowires (NWs). The proposed synthesis mechanism is corroborated by scanning electron microscopy, transition electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-vis absorption spectroscopy. The resulting Ag/C/Ni nanocables with an average diameter of ∼270 nm are made up of Ag NW core (∼200 nm diameter) with internal amorphous C layer (∼10 nm thickness) and outer Ni shell (∼25 nm thickness). The UV-vis absorption spectroscopy analysis indicates that the covering of the Ni shell on the Ag/C nanowire can dampen the surface plasmon resonance (SPR) of Ag wire core and lead to a red-shifted SPR absorption peak. In particular, compared with Ni NPs, the resultant double-shelled Ag/C/Ni magnetic nanocables exhibits higher catalytic activity for the dehydrogenation toward aqueous ammonia borane under ambient atmosphere, and its calculated activation energy is lower than those of many bimetallic catalysts.
Co-reporter:Mingzhu Cheng, Ming Wen, Shiqing Zhou, Qingsheng Wu, and Baolei Sun
Inorganic Chemistry 2012 Volume 51(Issue 3) pp:1495-1500
Publication Date(Web):January 18, 2012
DOI:10.1021/ic201763j
New dimensional NiCo alloy icosahedral nanocrystals with controllable size have been first reported and synthesized through an Ostwald ripening process in a template-absent solvothermal reaction system. The proposed synthesis is corroborated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). The as-obtained NiCo icosahedral nanocrystals exhibit the size- and component-dependent magnetic behaviors. The coercivity (Hc) depends on both the magnetocrystalline and structure anisotropy, and the saturation magnetizations (Ms) decided by the content of Co. Hc decreases from 189.02 to 147.95 Oe with the increase of the icosahedral NCs size from 200 to 850 nm. Especially, the Hc of the icosahedral NCs at 157.38 Oe is higher than that of nanospheres at 104.02 Oe. In addition, Ms and Hc increased with the increasing Co content. It can be an ideal building block for applications in magnetic media, sensors, and other devices.
Co-reporter:Ming Wen, Mingzhu Cheng, Shiqing Zhou, Qingsheng Wu, Na Wang, and Linyi Zhou
The Journal of Physical Chemistry C 2012 Volume 116(Issue 21) pp:11702-11708
Publication Date(Web):May 17, 2012
DOI:10.1021/jp2115912
The NiCo@Pt nanoallys from icosahedrons to hollow spheres are synthesized through the element lithographic process based on NiCo nanoicosahedrons. The morphology, structure, magnetic property, and its synergistic photocatalysis of nano-ZnO have been investigated by scan electron microscopy, transmission electron microscopy, X-ray diffraction analysis, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, vibration sample magnetometry measurement, and UV–vis spectroscopy. The as-prepared NiCo@Pt magnetic hollow nanospheres have the UV- and visible-light-driven synergistic photocatalysis for ZnO toward the degradation of dye wastewater. Especially the different coorporation photocatalysis can be observed under UV- and UV-filtered visible-light illumination, in which Ni45Co37@Pt18 under UV-light and Ni31Co26@Pt43 under visible-light exhibit the strongest enhancement for the photocatalytic reactivity of ZnO, respectively. The coercivity Hc and saturation magnetization Ms first decrease with the loss of Co displaced by Pt and then increase with the increase of Pt content, which shows the parabolic variation in which the Ni40Co34@Pt26 are lowest.
Co-reporter:Ming Wen, Xiangguo Meng, Baolei Sun, Qingsheng Wu, and Xiaolan Chai
Inorganic Chemistry 2011 Volume 50(Issue 19) pp:9393-9399
Publication Date(Web):September 8, 2011
DOI:10.1021/ic201410f
Newly designed magnetic-alloy/noble-metal FeCo/Pt nanorods have been first reported and fabricated through a length-controllable catalyzing-synthesis process in which the growth of FeCo nanorods was induced on Pt nanotips. The length of FeCo/Pt nanorods depends on the number of platinum nanotips. The proposed synthesis mechanism was corroborated by scanning electron microscopy, transition electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. With the decrease of Fe content in FexCo96–x/Pt4 nanoalloys from 77 to 15, the morphology changes from nanorods with different lengths to nanoparticles. The analysis of the magnetic hysteresis loops indicated that the magnetic saturation and coercivity were strongly dependent on the length of the nanorods in which maximum saturation magnetization and minimum coercivity were obtained for Fe77Co19/Pt4 nanorods with the length of ∼2.5 μm. In particular, FeCo/Pt exhibited length-dependent reactivity towards 1,1,2,2-tetrachloroethane, and Fe77Co19/Pt4 nanorods with the length of ∼2.5 μm yielded the greatest dechlorination rate. Moreover, Pt can enhance the dechlorination of 1,1,2,2-tetrachloroethane.
Co-reporter: Ming Wen;Fan Zhang;Mingzhu Cheng; Qingsheng Wu;Baolei Sun ;Yuzhen Sun
ChemPhysChem 2011 Volume 12( Issue 18) pp:3573-3577
Publication Date(Web):
DOI:10.1002/cphc.201100429
Abstract
Newly designed magnetic FeNi–Pt match-like heterostructured nanorods were synthesized by means of induced growth of FeNi nanorods on Pt nanotips. The proposed synthesis mechanism is corroborated by SEM, TEM, XRD and XPS. The magnetic behavior shows that the magnetic saturation and coercivity are strongly dependent on both the shape and the alloy composition. The saturation magnetizations (Ms) and the coercivity (Hc) of nanorods synthesized are larger than those of nanoparticles because of the relatively large anisotropy of nanorods. Maximum saturation magnetization is obtained for Fe82Ni15–Pt3 at 226.6 emu g−1, whereas maximum coercivity is obtained for Fe20Ni77–Pt3 at 136.8 Oe. Shape-dependent reactivity toward the reduction of chlorinated solvents was observed for the FeNi–Pt heterostructured nanomaterials. In particular, the Fe82Ni15–Pt3 nanorods are highly reactive in the dechlorination process of 1,1,2,2-tetrachloroethane.
Co-reporter:Fan Zhang, Ming Wen, Mingzhu Cheng, Qingsheng Wu and Xiangguo Meng
Journal of Materials Chemistry A 2010 vol. 20(Issue 36) pp:7661-7668
Publication Date(Web):02 Aug 2010
DOI:10.1039/C0JM00481B
The new one-dimensional (1D) FePtDy nanolayers-assemblied superstructures are first synthesized by inducing synthesis through a phase transfer process. The morphology, structure, magnetic property, thermal stability, and photocatalysis have been investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, energy dispersive X-ray analysis, differential scanning calorimetry, X-ray photoelectron spectroscopy, vibration sample magnetometry measurement, and UV-vis spectroscopy. The as-prepared 1D FePtDy nanolayers-assembly superstructures can induce excellent visible light photocatalysis effect for TiO2 by only simply mixing. Especially Fe39Pt53Dy8 nanolayers-assemblied 1D superstructures exhibit the strongest enhancement for the photocatalytic reactivity of TiO2 under visible light irradiation. In addition, phase transformation behaviors indicate that Dy inhibites transformation of L10 phase. The magnetic properties influenced by both the alloy component and shape, show that the coercivity has the parabolic type variation in which the Fe38Pt58Dy4 nanolayers-assemblied 1D superstructures get the largest.
Co-reporter:Ming Wen, Dan Yang, Qing-Sheng Wu, Ru-Ping Lu, Yuan-Zheng Zhu and Fan Zhang
Chemical Communications 2010 vol. 46(Issue 2) pp:219-221
Publication Date(Web):24 Nov 2009
DOI:10.1039/B916025F
EuFePt ternary amorphous alloy nanorods are first synthesized through Eu itself inducing action, and this nanoalloy including 4f electrons exhibits excellent properties on magnetism, thermostability, especially the cooperation photocatalysis activity of TiO2.
Co-reporter:Ming Wen, Ya-Fen Wang, Fan Zhang and Qing-Sheng Wu
The Journal of Physical Chemistry C 2009 Volume 113(Issue 15) pp:5960-5966
Publication Date(Web):2017-2-22
DOI:10.1021/jp809488t
Two-dimensional handkerchief-like nanostructures of Ni and NiCo magnetic amorphous alloys have been synthesized by a double composite structure-inducing template. High resolution transmission electron microscopy was used to characterize the morphology and the dimensions. The self-assembly of fine handkerchief-like Ni and NiCo nanoalloys is attributed to the cooperation between ion-selected delivery of a hard collodion membrane by nitro-group chemical complexations and the size-controlled action of a reverse microemulsion. Importantly, the coordinations of ethylenediamine with Ni2+ and Co2+ can restrict the structure-inducing action. The phase transformation behavior was recorded by differential scanning calorimetry. Substituting Co for Ni can slow phase transformation, and the kinetic ordering temperature increases with the Co concentration increasing. The magnetic property measurement results show that the saturation magnetizations increase as the Co concentration is increased, but the coercivity is not sensitive to the Co concentration and is decided only by the phase structure.
Co-reporter:Ming Wen, Yuan-zheng Zhu, Qing-sheng Wu, Fan Zhang and Tao Zhang
The Journal of Physical Chemistry C 2009 Volume 113(Issue 46) pp:19883-19890
Publication Date(Web):October 20, 2009
DOI:10.1021/jp908176e
A new effective strategy of composition-dependent assembly is first reported to synthesize length-controllable amorphous (Fe1−xNix)0.5Pt0.5 nanoalloys (nanoparticles, nanorods, and nanothreads) through phase-transfer process. The synthesized nanoalloy morphologies and structures, phase transformation behaviors, and magnetic properties were investigated by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction analysis (XRD), differential scanning calorimetry (DSC), and vibration sample magnetometry (VSM) measurements. The morphologies of as-prepared amorphous nanoalloys show composition-dependent nanothread length variation from 8 μm to 600 nm, which results in different phase-transformation behaviors and magnetic properties. In particular, magnetic specificity is discovered in that the magnetic property of as-obtained amorphous nanoalloys change from soft to hard as Ni content increases, but the variation trend of annealed ones is the inverse case. Thus, a coercivity constant composition point is found at Fe21Ni31Pt48. And FeNiPt nanothreads present larger magnetic anisotropy with higher coercivity of 3kOe than that of its nanoparticles with coercivity of 2.4kOe. In addition, Ni lowers L10 kinetic ordering temperature in (Fe1−xNix)0.5Pt0.5 nanoalloy systems.
Co-reporter:Jin Peng, Ming Wen, Chenxiang Wang, Qingsheng Wu and Yuzhen Sun
Dalton Transactions 2013 - vol. 42(Issue 24) pp:NaN8673-8673
Publication Date(Web):2013/03/19
DOI:10.1039/C3DT33018D
A three-dimensional (3D) broom-like nanostructured magnetic FeNi catalyst was synthesized using inexpensive Fe and Ni as precursors in a controllable microwave-assisted route. In this 3D broom-like nanostructure, the length of an FeNi nanorod, which serves as a building block, depends on the molar content of Fe. With a decrease in the Fe content from 100 to 45% in the FexNi96−x system, the length varies from 8 μm to 1 μm, which is corroborated by SEM, TEM, XRD, EDS and XPS. The magnetic behavior measurement results show that the magnetic saturation and coercivity are strongly influenced by the length of the nanorods and the Fe content. The sample of Fe nanorods gives a maximum magnetization saturation at 196 emu g−1, and a maximum coercivity of 241.23 Oe is obtained for Fe78Ni22. These economical 3D FeNi broom-like nanostructures, with large surface areas and dispersed active sites, can dramatically facilitate the diffusion and transportation of a reactant to improve the reactivity. In particular, Fe89Ni11 broom-like nanostructures exert an excellent reactivity towards the reductive dechlorination of 1,1,2,2-tetrachloroethane.
Co-reporter:Linyi Zhou, Ming Wen, Qingsheng Wu and Dandan Wu
Dalton Transactions 2014 - vol. 43(Issue 21) pp:NaN7929-7929
Publication Date(Web):2014/02/25
DOI:10.1039/C4DT00052H
Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core–shell-structured nanocables with Ni nanoparticles (NPs) attached on FeNi nanorods (NRs) surface loosely. The catalytic reactivity monitored by means of a UV-vis dynamic process shows FeNi@Ni nanocables can catalyse the transformation of p-nitrophenol to p-aminophenol completely under an ambient atmosphere at room temperature, and enable the catalysis to be more efficient than its counterparts FeNi NRs and Ni NPs due to the interfacial synergistic effect. Additionally, the resultant hierarchical metal–alloy nanocomposites possess ferromagnetic behaviour, and can be easily separated and recycled by an external magnet field for application.
Co-reporter:Hanxing Chen, Ming Wen, Zaidi Huang, Qingsheng Wu, Jiali Liu and Teng Tu
Journal of Materials Chemistry A 2015 - vol. 3(Issue 2) pp:NaN607-607
Publication Date(Web):2014/11/10
DOI:10.1039/C4TA05204H
Highly active Cu@ZnO brush-like nanostructures have been successfully synthesized through the heteroepitaxial growth process of ZnO branched nanorods (NRs) based on Cu core nanowires (NWs), and used for the evaluation of selective catalytic degradation for polycyclic aromatic compounds. The resultant Cu@ZnO nanobrushes, with the main diameter of ∼500 nm, consist of Cu core NWs with diameter of ∼50 nm and outer ZnO branch NRs shells with thickness of ∼250 nm. The as-designed Cu@ZnO nanobrushes exhibit high performance for the selective catalytic degradation of polycyclic aromatic compounds. Nearly 90% conversion with the reaction rate constant (k) of 0.012 min−1 can be achieved for anthracene, while only about 50% and 10% conversions are shown for phenanthrene and naphthalene, respectively. Besides the highly efficient transportation of electrons, Cu NWs have strong capacity for oxygen activation which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface, which is responsible for the high catalytic efficiency of Cu@ZnO nanobrushes toward the selective degradation of anthracene.
Co-reporter:Hanxing Chen, Teng Tu, Ming Wen and Qingsheng Wu
Dalton Transactions 2015 - vol. 44(Issue 35) pp:NaN15652-15652
Publication Date(Web):2015/08/06
DOI:10.1039/C5DT01393C
New Cu2O-on-Cu nanowires (NWs) are constructed to develop the visible-light-driven activity of photocatalysts via the facile self-assembly of Cu2O nanoparticles (NPs) on a Cu NW surface assisted by a structure director, followed in situ reduction. In the resultant Cu2O-on-Cu NWs, the Cu2O NPs, with a diameter of 10 nm, show good distribution on the 50 nm-sized Cu single-crystal NWs. Owing to the band-gap adjusting effect and high electron transportation, the coupling of narrow-band-gap semiconductor Cu2O and excellent conductor Cu can lead to the markedly enhanced high visible light photocatalytic activity of Cu2O-on-Cu NWs toward the degradation of dye pollutants including Rhodamine B (RhB), methyl orange (MO) and methyl blue (MB). The as-designed Cu2O-on-Cu heterostructured NWs exhibit higher performance for the catalytic degradation of dye compounds than pure Cu2O. Nearly 60%, 100%, and 85% conversion with reaction rate constants (k) of 0.0137, 0.0746 and 0.0599 min−1 can be achieved for the degradation of RhB, MO and MB, respectively. Besides the highly efficient transportation of electrons, Cu NWs have a strong capacity for oxygen activation, which results in the gathering of negative charges and rich chemisorbed oxygen onto the surface. This may be responsible for the high catalytic efficiency of the Cu2O-on-Cu NWs toward the degradation of organic pollutants.
Co-reporter:Ming Wen, Dan Yang, Qing-Sheng Wu, Ru-Ping Lu, Yuan-Zheng Zhu and Fan Zhang
Chemical Communications 2010 - vol. 46(Issue 2) pp:NaN221-221
Publication Date(Web):2009/11/24
DOI:10.1039/B916025F
EuFePt ternary amorphous alloy nanorods are first synthesized through Eu itself inducing action, and this nanoalloy including 4f electrons exhibits excellent properties on magnetism, thermostability, especially the cooperation photocatalysis activity of TiO2.
Co-reporter:Fan Zhang, Ming Wen, Mingzhu Cheng, Qingsheng Wu and Xiangguo Meng
Journal of Materials Chemistry A 2010 - vol. 20(Issue 36) pp:NaN7668-7668
Publication Date(Web):2010/08/02
DOI:10.1039/C0JM00481B
The new one-dimensional (1D) FePtDy nanolayers-assemblied superstructures are first synthesized by inducing synthesis through a phase transfer process. The morphology, structure, magnetic property, thermal stability, and photocatalysis have been investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, energy dispersive X-ray analysis, differential scanning calorimetry, X-ray photoelectron spectroscopy, vibration sample magnetometry measurement, and UV-vis spectroscopy. The as-prepared 1D FePtDy nanolayers-assembly superstructures can induce excellent visible light photocatalysis effect for TiO2 by only simply mixing. Especially Fe39Pt53Dy8 nanolayers-assemblied 1D superstructures exhibit the strongest enhancement for the photocatalytic reactivity of TiO2 under visible light irradiation. In addition, phase transformation behaviors indicate that Dy inhibites transformation of L10 phase. The magnetic properties influenced by both the alloy component and shape, show that the coercivity has the parabolic type variation in which the Fe38Pt58Dy4 nanolayers-assemblied 1D superstructures get the largest.
Co-reporter:Dandan Wu, Ming Wen, Xijian Lin, Qingsheng Wu, Chen Gu and Hanxing Chen
Journal of Materials Chemistry A 2016 - vol. 4(Issue 17) pp:NaN6602-6602
Publication Date(Web):2016/04/15
DOI:10.1039/C6TA01092J
The exploration of non-noble-metal recyclable catalysts for high efficiency H2 generation from N2H4·H2O is of great significance for the sustainable strategy of society. A NiCo/NiO–CoOx ultrathin layered catalyst was fabricated successfully via a dynamics controlling coprecipitation–reduction (DCCR) process followed by calcination and applied to H2 generation from N2H4·H2O. Small nanosized NiCo particles (∼4 nm) were uniformly anchored on the surface of the NiO–CoOx ultrathin layered supports. Based on the cooperation between the NiCo active-centers and high intensity base-sites of the NiO–CoOx support, the Ni70Co30/NiO–CoOx ultrathin layered nanocomposite exhibits over 99% selectivity for H2 generation from N2H4·H2O with a high reaction rate (molN2H4 molNiCo−1 h−1) of 5.49 h−1 without using alkali as a catalyst promoter at 25 °C, which is superior to the reported studies. Moreover, the NiCo nanoalloys loading on the NiO–CoOx sheets enables an outstanding recycle performance over 10 cycles. The non-noble-metal NiCo/NiO–CoOx layered nanocomposite shows great value in catalyzing H2 generation from N2H4·H2O in practical applications.
Co-reporter:Ming Wen, Baolei Sun, Bo Zhou, Qingsheng Wu and Jin Peng
Journal of Materials Chemistry A 2012 - vol. 22(Issue 24) pp:NaN11993-11993
Publication Date(Web):2012/05/11
DOI:10.1039/C2JM31311A
Double-shelled Ag/C/Ni nanocables have been synthesized through a deposition covering process of Ni nanoparticles (NPs) onto Ag/C pentagonal prism nanowires (NWs). The proposed synthesis mechanism is corroborated by scanning electron microscopy, transition electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-vis absorption spectroscopy. The resulting Ag/C/Ni nanocables with an average diameter of ∼270 nm are made up of Ag NW core (∼200 nm diameter) with internal amorphous C layer (∼10 nm thickness) and outer Ni shell (∼25 nm thickness). The UV-vis absorption spectroscopy analysis indicates that the covering of the Ni shell on the Ag/C nanowire can dampen the surface plasmon resonance (SPR) of Ag wire core and lead to a red-shifted SPR absorption peak. In particular, compared with Ni NPs, the resultant double-shelled Ag/C/Ni magnetic nanocables exhibits higher catalytic activity for the dehydrogenation toward aqueous ammonia borane under ambient atmosphere, and its calculated activation energy is lower than those of many bimetallic catalysts.
