物理化学学报 >> 2007, Vol. 23 >> Issue (01): 68-72.doi: 10.3866/PKU.WHXB20070114

研究论文 上一篇    下一篇

Pt纳米粒子修饰的多孔硅电极的制备及其电催化性能

田娟;郑丹;张熙贵;张宝宏;夏保佳;杨辉   

  1. 哈尔滨工程大学化工学院, 哈尔滨 150001; 中国科学院上海微系统与信息技术研究所纳米技术研究室, 上海 200050
  • 收稿日期:2006-06-12 修回日期:2006-09-05 发布日期:2007-01-08
  • 通讯作者: 杨辉 E-mail:hyang@mail.sim.ac.cn

Preparation of Pt Nanoparticle Modified Porous Silicon Electrode and Its Electrocatalytic Performance

TIAN Juan;ZHENG Dan;ZHANG Xi-Gui;ZHANG Bao-Hong;XIA Bao-Jia;YANG Hui   

  1. College of Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China; Nano Technology Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, P. R. China)
  • Received:2006-06-12 Revised:2006-09-05 Published:2007-01-08
  • Contact: YANG Hui E-mail:hyang@mail.sim.ac.cn

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摘要： 通过循环伏安法电沉积使直径约为7 nm的Pt纳米粒子均匀地分散于多孔硅表面, 拟用作微型质子交换膜燃料电池的催化电极. 与刷涂法相比较, 电沉积Pt纳米粒子的多孔硅电极(Pt/Si)呈现出高的Pt利用率和增强的电催化活性. 当Pt载量为0.38 mg•cm−2时, 其电化学活性比表面积高达148 cm2•mg−1, 是刷涂相近质量的纳米Pt/C催化剂的多孔硅电极Pt-C/Si的2倍多；该修饰电极对甲醇氧化也呈现了增强的催化性能和好的稳定性, 在0.5 V(vs SCE)极化1 h后电流密度为4.52 mA•cm−2, 而刷涂了相近Pt量的Pt-C/Si电极的电流密度只有0.36 mA•cm−2.

关键词: 多孔硅, Pt纳米粒子, 循环伏安法, 微型质子交换膜燃料电池

Abstract: Porous silicon electrodes with electrodeposited Pt nanoparticles by cyclic voltammetry (Pt/Si) could be used as catalytic electrodes in micro proton exchange membrane fuel cells. As-deposited Pt nanoparticles with a mean diameter of ca 7 nm are highly dispersed on the surface of porous silicon. As compared to the electrode prepared by brushing nanosized Pt/C catalyst on the surface of porous silicon (Pt-C/Si), the Pt/Si modified electrodes exhibited high Pt utilization and enhanced catalytic performances for the hydrogen adsorption/desorption and for methanol oxidation. The maximum electrochemical specific area of ca 148 cm2•mg−1 was obtained with an electrodeposited Pt loading of ca 0.38 mg•cm−2, which is ca 2 times higher than that of the Pt-C/Si electrode with similar Pt loading of ca 0.40 mg•cm−2. Such a Pt/Si electrode showed an enhanced catalytic activity for methanol oxidation. After polarization at 0.5 V(vs SCE) for 1 h in 0.5 mol•L−1 CH3OH+0.5 mol•L−1 H2SO4, the obtained current density on this electrode was ca 4.52 mA•cm−2, which was much higher than the current density of 0.36 mA•cm−2 on Pt-C/Si electrode, again assessing high catalytic activity and good stability of electrodeposited Pt modified electrodes.

Key words: Porous silicon, Pt nanoparticle, Cyclic voltammetry, Micro proton exchange membrane fuel cell