In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst

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In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst

WANG Qi^1,2, SUN Gong-Quan¹, YAN Shi-You¹, WANG Guo-Xiong¹, XIN Qin¹, CHEN Qing-Song³, LI Jun-Tao³, JIANG Yan-Xia³, SUN Shi-Gang³

1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;
3. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005, China

Received:2005-12-14 Revised:1900-01-01 Online:2006-11-10 Published:2006-11-10
Contact: SUN Shi-Gang

Abstract

Abstract: A modified polyol process was used to prepare Pt/C, PtRu/C and Ru/C electrocatalysts. Calculated from XRD patterns, the mean particle size of PtRu/C electrocatalyst was 2.2 nm and the percentage of Ru alloyed was 71%, respectively. Adsorption and electrooxidation progress of methanol on PtRu/C electrocatalyst was investigated by in situ FTIRS, combined with electrochemical experiments. It is revealed that the activity of PtRu/C electrocatalyst for methanol oxidation was much higher than that of Pt/C. Addition of Ru in PtRu/C electrocatalyst changed the characteristic of methanol adsorption, and Ru—OH species could oxidize linear bonded CO(CO_L) at a lower potential, thus inhibited the catalyst poisoning. In addition, from FTIRs results, CO_L was evidently identified to the main poisonous species and the major product was CO₂. Methyl formate was also identified. Based on these results, the mechanism of methanol oxidation was discussed.

Key words: Direct methanol fuel cell, PtRu/C, Methanol oxidation, Electrochemistry, In situ FTIR

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WANG Qi^1,2, SUN Gong-Quan¹, YAN Shi-You¹, WANG Guo-Xiong¹, XIN Qin¹, CHEN Qing-Song³, LI Jun-Tao³, JIANG Yan-Xia³, SUN Shi-Gang³. In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst[J]. Chem. J. Chinese Universities, doi: .

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In situ Electrochemical FTIR Spectroscopy of Adsorption and Oxidation Process of Methanol on PtRu/C Electrocatalyst

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