中华医学超声杂志

应用化学 ›› 2011, Vol. 28 ›› Issue (03): 302-307.DOI: 10.3724/SP.J.1095.2011.00311

• 研究论文 • 上一篇    下一篇

铂-氧化铈/聚苯胺/聚砜复合膜电极的制备及对甲醇的电催化氧化

冯晓娟1*,石彦龙1,王永生1,敏世雄1,胡中爱2   

  1. (1.河西学院化学系 张掖 734000;2.西北师范大学化学化工学院 兰州)
  • 收稿日期:2010-05-26 修回日期:2010-07-01 出版日期:2011-03-10 发布日期:2011-03-10
  • 通讯作者: 冯晓娟，讲师; E-mail:fengxiaojuan820@yahoo.cn; 研究方向：新能源材料
  • 基金资助:
    河西学院西部资源环境化学重点实验室基金资助项目（XZ0706）

Preparation of Pt-CeO2/PAN/PSF Composite Film Electrode and Their Electrocatalytic Activity for Methanol Oxidation

FENG Xiao-Juan1*, SHI Yan-Long1, WANG Yong-Sheng1, MIN Shi-Xiong1, HU Zhong-Ai2   

  1. (1.Department of Chemistry,Hexi University，Zhangye 734000;
    2.College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou)
  • Received:2010-05-26 Revised:2010-07-01 Published:2011-03-10 Online:2011-03-10

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摘要：

采用电化学聚合法制备了掺杂CeO2纳米粒子的聚苯胺(PAN)/聚砜(PSF)复合膜电极，在其上电沉积铂粒子，制得了铂-氧化铈/聚苯胺/聚砜的复合膜修饰电极。 复合膜的形貌和化学组分通过冷场发射扫描电子显微镜（Cold FE-SEM）和能量散射X射线谱（EDS）进行了表征，用循环伏安法和电化学交流阻抗法考察了复合膜电极对甲醇的电催化氧化性能。 结果表明，复合膜的双层多孔结构使铂粒子与CeO2粒子在复合膜内层的多孔聚苯胺上均匀沉积，粒子平均尺寸约为80 nm；CeO2为铂质量的7%时，铂-氧化铈/聚苯胺/聚砜复合膜修饰电极对甲醇有很好的电催化氧化性能和高的稳定性。

关键词: 铂-氧化铈/聚苯胺/聚砜复合膜电极, 电催化氧化, 循环伏安, 交流阻抗

Abstract:

The polyaniline/polysulfone(PAN/PSF) composite film modified electrodes doped with cerium oxide were prepared by electropolymerization, and then Pt particles were deposited into this composite film to obtain the Pt modified cerium oxide/polyaniline/polysulfone(Pt-CeO2/PAN/PSF) electrodes. Their morphology and chemical component were characterized by field emission scanning electron microscopy(FESEM) and energy dispersive X-ray spectroscopy(EDS), respectively. Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) techniques were applied to investigate the electrocatalytic activity of the electrode for methanol oxidation. The results show that the composite film has a bi-layer structure with asymmetrical pores, and platinum and cerium oxide particles are uniformly dispersed in the modified film electrodes. The average size of particles is about 80 nm. The electrode holds higher electrocatalytic activity and better stability for methanol oxidation on the condition of mass ratio between CeO2 and Pt is equal to 7%.

Key words: Pt-CeO2/PAN/PSF electrodes electrode, Catalytic activity, cyclic votammetry, electrochemical impedance spectroscopy

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