Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (06): 542-547.doi: 10.3866/PKU.WHXB19970612

• ARTICLE • Previous Articles     Next Articles

Electrocatalytic Oxidation of Methanol on Polythionine Film Modified with Pt Microparticles

Yang Hui,Li Chang-Zhi,Lu Tian-Hong,Xue Kuan-Hong,Sun Shi-Gang,Lu Guo-Qiang,Chen Sheng-Pei   

  1. Changchun Institute of Applied Chemistry,Academia Sinica,Changchun 130022|Department of Chemistry,Nanjing Normal University,Nnajing 210097|Department of Chemsitry,Xiamen University,Xiamen 361005
  • Received:1996-10-15 Revised:1997-01-23 Published:1997-06-15
  • Contact: Lu Tian-Hong

Abstract:

The electrocatalytic oxidation of methanol on polythionine(PTn) film modified with Pt microparticles has been studied by means of cyclic voltammetry and in-situ FTIR spectroscopy. The Pt microparticles produced by cyclic voltammetry were highly dispersed in and on the PTn film. The modified electrodes exhibit significant electrocatalytic activity for the oxidation of methanol and the catalytic activity was found in dependence on the Pt loading. The linearly adsorbed CO species is the only intermediate in the oxidation of methanol and the abnormal IR spectra for adsorbed CO were observed. On such modified electrodes, adsorbed CO species derived from methanol can be readily oxidized. The enhanced electrocatalytic activity may be ascribed to the high dispersion of Pt microparticles in and on the PTn film and the synergestic effect between Pt microparticles and the polymer. From the above results, a possible reaction mechanism was proposed.

Key words: Platinum microparticles, Polythionine, Methanol, Electrocatalytic oxidation, In-situ FTIR