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

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