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Acta Physico-Chimica Sinica  2004, Vol. 20 Issue (01): 9-14    DOI: 10.3866/PKU.WHXB20040103
Article     
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
College of Chemistry and Chemical Engineering , Hunan University; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082
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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 wordsNano-fibular polyaniline      Electrodepositing Pt microparticles       Methanol oxidation      Electrocatalysis     
Received: 15 May 2003      Published: 15 January 2004
Corresponding Authors: Kuang Ya-Fei     E-mail: yafeik@163.com
Cite this article:

Zhou Hai-Hui;Jiao Shu-Qiang;Chen Jin-Hua;Wei Wan-Zhi;Kuang Ya-Fei. Electrocatalytic Oxidation of Methanol on Nano-fibular Polyaniline Electrode Modified with Pt Microparticles. Acta Physico-Chimica Sinica, 2004, 20(01): 9-14.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20040103     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2004/V20/I01/9

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