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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2012,Vol.28>> Issue(09)>> 2071-2076     doi: 10.3866/PKU.WHXB201205031         中文摘要
ELECTROCHEMISTRY AND NEW ENERGY
Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy
ZHOU Xin-Wen1, GAN Ya-Li1, SUN Shi-Gang2
1. Department of Chemistry, College of Chemistry and Life Science, Three Gorges University, Yichang 443002, Hubei Province, P. R. China;
2. State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
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Hollow CoPt nanospheres were synthesized by chemical reduction and galvanic displacement reactions. The catalyst showed good electrocatalytic activity for methanol oxidation. The results of transmission electron microscopy (TEM), energy dispersive spectromenter (EDS), and electrochemical cyclic voltammograms indicated that, in the process of electrochemical experiments carried in 0.1 mol·L-1 H2SO4 and 0.1 mol·L-1CH3OH, hollow CoPt nanospheres were dealloying, which induced the dissolution of elemental Co from the surface of the catalyst. After the dealloying process, more Pt active sites were exposed on the surface of the catalyst and the catalyst showed better catalytic activity, as well as enhanced structural stability. The electrooxidation of methanol on the hollow CoPt nanospheres was studied on the molecular level using in situ electrochemical Fourier transform infrared (FTIR) spectroscopy. The toxic intermediate CO observed on the CoPt nanorods displayed abnormal infrared effects (AIREs). The FTIR results were similar to those obtained in an earlier experiment on the hollow CoPt nanospheres using CO as a probe molecule. All the results suggested that the dealloying method would be a useful technique for regulating the composition and performance of the catalyst. In situ electrochemical FTIR was highlighted as a potential method for studying the oxidation processes of organic molecules. It is envisaged that these methods will be widely used in the field of fuel cell research.



Keywords: Hollow CoPt nanosphere   Dealloying process   Methanol oxidation   In situ electrochemical FTIR spectroscopy   Fuel cell  
Received: 2012-03-07 Accepted: 2012-05-02 Publication Date (Web): 2012-05-03
Corresponding Authors: ZHOU Xin-Wen, SUN Shi-Gang Email: xwzhou@ctgu.edu.cn; sgsun@xmu.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (20833005).

Cite this article: ZHOU Xin-Wen, GAN Ya-Li, SUN Shi-Gang. Studies of Oxidation Processes of Methanol on Hollow CoPt Nanospheres and In situ Electrochemical Fourier Transform Infrared Spectroscopy[J]. Acta Phys. -Chim. Sin., 2012,28 (09): 2071-2076.    doi: 10.3866/PKU.WHXB201205031

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