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Dodecahedral W@WC composite as efficient catalyst for hydrogen evolution and Nitrobenzene reduction reactions

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journal contribution
posted on 19.06.2017, 12:59 by Zhao-Yang Chen, Long-Fa Duan, Tian Sheng, Xiao Lin, Ya-Feng Chen, You-Qun Chu, Shi-Gang Sun, Wen-Feng LinWen-Feng Lin
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.

Funding

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).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

ACS Appl. Mater. Interfaces

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.

Publisher

American Chemical Society

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

31/05/2017

Publication date

2017-05-31

Notes

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.

ISSN

1944-8244

eISSN

1944-8252

Language

en