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Title: Dodecahedral W@WC composite as efficient catalyst for hydrogen evolution and Nitrobenzene reduction reactions
Authors: Chen, Zhao-Yang
Duan, Long-Fa
Sheng, Tian
Lin, Xiao
Chen, Ya-Feng
Chu, You-Qun
Sun, Shi-Gang
Lin, Wen-Feng
Keywords: Tungsten
Tungsten carbide
Core shell structure
Self assembly
Electro catalyst
Density functional theory
Hydrogen evolution
Issue Date: 2017
Publisher: American Chemical Society
Citation: CHEN, Z-Y. ...et al., 2017. Dodecahedral W@WC composite as efficient catalyst for hydrogen evolution and Nitrobenzene reduction reactions. ACS Applied Materials and Interfaces, 9(24), pp.20594−20602.
Abstract: Core-shell composites with strong phase-phase contact could provide an incentive for catalytic activity. A simple yet efficient H2O-mediated method has been developed to synthesize mesoscopic core-shell W@WC architecture with dodecahedral microstructure, via one-pot reaction. The H2O plays an important role in the resistance of carbon diffusion, resulting in the formation of the W core and W-terminated WC shell. Density functional theory (DFT) calculations reveal that adding W as core reduced the oxygen adsorption energy and provided the W-terminated WC surface. The W@WC exhibits significant electrocatalytic activities towards hydrogen evolution and nitrobenzene electro-reduction reactions, which are comparable to those found for commercial Pt/C, and substantially higher than those found for meso- and nano- WC materials. The experimental results were explained by DFT calculations based on the energy profiles in the hydrogen evolution reactions over WC, W@WC and Pt model surfaces. The W@WC also shows a high thermal stability and thus may serve as a promising more economical alternative to Pt catalysts in these important energy conversion and environmental protection applications. The current approach can also be extended or adapted to various metals and carbides, allowing for the design and fabrication of a wide range of catalytic and other multifunctional composites.
Description: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Sponsor: Financial support was provided by Loughborough University and the UK EPSRC (EP/I013229/1), Natural Science Foundation of Zheji ang Province (LQ15B030004), International Science & Technology Cooperation Program of China (2010DFB63680).
Version: Published
DOI: 10.1021/acsami.7b04419
URI: https://dspace.lboro.ac.uk/2134/25459
Publisher Link: http://dx.doi.org/10.1021/acsami.7b04419
Related Resource: https://doi.org/10.17028/rd.lboro.5117692
ISSN: 1944-8244
Appears in Collections:Published Articles (Chemical Engineering)

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