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The origin of the high performance of tungsten carbides/carbon nanotubes supported Pt catalysts for methanol electrooxidation
Authors:Zuzhen Zhao  Xiang Fang  Yongliang Li  Yi Wang  Pei Kang Shen  Fangyan Xie  Xin Zhang
Institution:1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 135 Xingang Road, Guangzhou, Guangdong 510275, PR China;2. Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou 510275, PR China;3. Department of Chemistry, Shantou University, Shantou 515063, PR China
Abstract:The Pt supported on WC modified MWCNT catalysts (PtWC/MWCNT) were synthesized by the combination of organic colloidal and intermittent microwave heating (IMH) methods for the first. The results proved the better performance of the PtWC/MWCNT catalyst than that of Pt/C for methanol oxidation in terms of the onset potential and peak current density. The synergistic effect between Pt nanoparticles and WC and the structure effect of the MWCNTs could be the reasons to result in the high activity. The CO stripping test provided the evidence that the onset potential shift for methanol oxidation is consistent with the reduction in the overpotential for the CO oxidation on PtWC/MWCNT catalyst. Therefore, the mechanism of the high performance for methanol oxidation on PtWC/MWCNT catalyst is probably the easier oxidation of CO-like species which cause high overpotential for further oxidation of methanol.
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