物理化学学报 >> 2004, Vol. 20 >> Issue (01): 9-14.doi: 10.3866/PKU.WHXB20040103

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Pt微粒修饰纳米纤维聚苯胺电极对甲醇氧化电催化

周海晖;焦树强;陈金华;魏万之;旷亚非   

  1. 湖南大学化学化工学院; 化学生物传感与计量学国家重点实验室,长沙　410082
  • 收稿日期:2003-05-15 修回日期:2003-08-18 发布日期:2004-01-15
  • 通讯作者: 旷亚非 E-mail:yafeik@163.com

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 E-mail:yafeik@163.com

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摘要： 以脉冲电流法制备的纳米纤维状聚苯胺(PANI)为Pt催化剂载体，用它制备了甲醇阳极氧化的催化电极Pt/（nano-fibular PANI）.研究结果表明, Pt/（nano-fibular PANI）电极对甲醇氧化具有很好的电催化活性,并有协同催化作用.在相同的Pt载量条件下， Pt/（nano-fibular PANI）电极比Pt微粒修饰的颗粒状聚苯胺电极Pt/(granular PANI)具有更好的电催化活性.此外， Pt的电沉积修饰方法同样影响Pt/（nano-fibular PANI）电极对甲醇氧化的催化活性.脉冲电流法沉积Pt形成的复合电极较循环伏安法电沉积得到的Pt复合电极具有更优异的催化活性.

关键词: 纳米纤维聚苯胺, 电沉积Pt颗粒, 甲醇氧化, 电化学催化

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