Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (03): 291-295.doi: 10.1016/S1872-1508(06)60004-1

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SERS Study of the Electrooxidation of Formic Acid on Pt-Ru/GC

ZHONG Qi-Ling; HUANG Peng; ZHANG Bing; YANG Xiong-Yuan; DING Yue-Min; ZHOU Hai-Hui; REN Bin; TIAN Zhong-Qun   

  1. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China; Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, P. R. China
  • Received:2005-08-12 Revised:2005-10-17 Published:2006-03-10
  • Contact: ZHONG Qi-Ling E-mail:zhqiling@163.com

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Abstract: The electrooxidation behavior of formic acid on Pt-Ru/GC electrode was investigated by CV, multi-potential steps and SERS. It was found that formic acid could dissociate spontaneously on Pt-Ru/GC electrode as it dissociated on rough Pt electrode, produce strong absorption intermediate CO and reactive intermediate —COO－. The results demonstrated that Ru could improve the electrocatalytic activity of formic acid on Pt-Ru/GC electrode. As the ratio of Pt and Ru in desposition solution changed from 10∶1 to 1∶1, the oxidation potential of CO shifted negatively about 60 mV(from 0.41 V to 0.35 V). Compared to rough Pt electrode, the oxidation potential of CO on Pt-Ru/GC(1∶1) shifted negatively 200 mV. These results indicate that SERS is hopeful to be a comprehensive spectroscopy tool of investigating the electrocatalytic reaction mechanism.

Key words: Formic acid oxidation, Platinum and ruthenium nanoparticles, Glassy carbon electrode, SERS