Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (01): 9-14.doi: 10.3866/PKU.WHXB20040103

• ARTICLE • Previous Articles     Next Articles

Electrocatalytic Oxidation of Methanol on Nano-fibular Polyaniline Electrode Modified with Pt Microparticles

Zhou Hai-Hui;Jiao Shu-Qiang;Chen Jin-Hua;Wei Wan-Zhi;Kuang Ya-Fei   

  1. College of Chemistry and Chemical Engineering , Hunan University; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082
  • Received:2003-05-15 Revised:2003-08-18 Published:2004-01-15
  • Contact: Kuang Ya-Fei

Abstract: Nano-fibular polyaniline(PANI) film with large specific surface area was prepared by pulse galvanostatic method(PGM) and the electrode of nano-fibular PANI modified by Pt microparticles[Pt/(nano-fibular PANI)] was used as the catalyzed electrode for methanol oxidation in this paper. The research results show that there is a synergism for methanol oxidation on Pt/(nano-fibular PANI) electrode. The Pt/(nano-fibular PANI) electrode exhibits a considerably higher electrocatalytic activity on methanol oxidation than that of the Pt/(granular PANI) electrode when Pt is deposited by cyclic voltammetry method (CVM). The catalytic activity of Pt/(nano-fibular PANI) electrode is 8 times higher than that of Pt/(granular PANI) electrode under the condition of Pt loading of 800 μg•cm-2. Moreover, the research results show that the catalytic activity of Pt/PANI electrode can be further improved when Pt is deposited by PGM. The results of scanning electron microscopy (SEM) show that a large number of Pt microparticles with diameter of about 30 nm are dispersed homogeneously on nano-fibular PANI with diameter about 100 nm. This leads to an increase in specific surface area and dispersion of Pt and hence results in a high catalytic activity of the Pt/PANI composite electrode. The results of electrochemical impedance spectroscopy (EIS) show that the Pt/(nano-fibular PANI) electrode has relatively lower electrochemical impedance for methanol oxidation than that of the Pt/(granular PANI) electrode.

Key words: Nano-fibular polyaniline, Electrodepositing Pt microparticles,  Methanol oxidation, Electrocatalysis