Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (09): 1432-1436.doi: 10.3866/PKU.WHXB20070923

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In-situ Surface-enhanced Raman Spectroscopic Investigation on Ethanol Electrooxidation in Different Media

ZHONG Qi-Ling; ZHANG Bing; DING Yue-Min; LIU Yue-Long; RAO Gui-Shi; WANG Guo-Fu; REN Bin; TIAN Zhong-Qun   

  1. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China; School of Sciences, Tianjin University, Tianjin 300072, P. R. China; State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2007-01-22 Revised:2007-05-02 Published:2007-09-06
  • Contact: ZHONG Qi-Ling; REN Bin E-mail:zhqiling@163.com; bren@xmu.edu.cn

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Abstract: Electrochemical voltametric methods and in-situ electrochemical surface-enhanced Raman spectroscopy (SERS) were used to investigate the electrooxidation behavior of ethanol in different media on a roughened platinum electrode. It was found that ethanol could dissociate spontaneously to produce strongly adsorbed intermediate, CO, in acidic, neutral, and alkaline media on the roughened platinum electrode. The complete oxidation potential of COad on the roughened platinumelectrode was negatively shifted about 0.300V in the alkaline medium (0.20 V) compared with that in the acidic and neutral media (0.50 V). The positive oxidation peak potential of ethanol was negatively shifted about 0.85 V in the alkaline medium (-0.20 V) than that in the acidic medium (0.65 V). By comparing the oxidation current and the peak potential, it was found that the electrocatalytic activity of roughened platinum electrode for ethanol and CO oxidation in the alkaline medium was higher than in acidic and neutral media. The results suggested that ethanol was oxidized to CO2 on the roughened platinum electrode via parallel reaction mechanism in acidic, neutral or alkaline media.

Key words: Ethanol oxidation, Roughened platinumelectrode, Alkaline medium, In-situ SERS