物理化学学报 >> 2005, Vol. 21 >> Issue (09): 1006-1010.doi: 10.3866/PKU.WHXB20050913

研究论文 上一篇    下一篇

金属间化合物PtSb对乙醇的电催化氧化性能

张丽娟; 夏定国   

  1. 北京工业大学环境与能源工程学院, 北京 100022
  • 收稿日期:2005-03-01 修回日期:2005-03-23 发布日期:2005-09-15
  • 通讯作者: 张丽娟 E-mail:zhanglj1997@bjut.edu.cn

Electrocatalytic Activity of Ordered Intermetallic PtSb for Ethanol Electrooxidation

ZHANG Li-juan; XIA Ding-guo   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022
  • Received:2005-03-01 Revised:2005-03-23 Published:2005-09-15
  • Contact: ZHANG Li-juan E-mail:zhanglj1997@bjut.edu.cn

摘要: 采用氩弧熔炼和热处理方法获得PtSb有序金属间化合物材料. 用循环伏安和计时电流技术进行电化学性能测试. 在含有0. 25 mol•L-1 CH3CH2OH的硫酸溶液中, 通过对乙醇电氧化的起始电位和电流密度大小的比较发现, PtSb金属间化合物具有良好的催化乙醇氧化性能. 利用XRD和XPS技术分析了晶体结构和电子结构. 采用不同扫描速率下的循环伏安技术得到乙醇氧化的电子交换系数(α), 发现C2H5OH在PtSb催化剂表面上反应时的α远远大于在Pt电极表面的.

关键词: 电催化, PtSb, 金属间化合物, 燃料电池, 乙醇

Abstract: Ordered intermetallic PtSb was synthesized by arc-melting and then sintering treatment. The electro-oxidation of liquid ethanol on PtSb was investigated at room temperature by cyclic voltammetry and chronoamperometry. The results were compared with those at a polycrystalline platinum electrode surface. It was found that at the PtSb surface the onset potential for ethanol oxidation was shifted negatively over 200 mV and the current density at PtSb electrode was about six fold as that at Pt electrode. XRD and XPS technologies were used to investigate the crystal structure and electron effect. The results of electrochemical test and ex-site FT-IR test suggested that ethanol decomposition on PtSb favors the reactive intermediate route and the CO intermediate has less effect on PtSb than on Pt. Part of the dynamic parameters of the electrocatalytic oxidation of ethanol on Pt and PtSb electrodes were obtained through the cyclic voltammetry of different scanning speed. The electron exchange coefficient (α) for C2H5OH oxidation on PtSb electrode was much higher than that on Pt electrode.

Key words: Electrocatalysis, PtSb, Intermetallic compounds, Fuel cells, Ethanol