高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

直接甲醇燃料电池电催化剂性能衰减研究

陈维民1,2,3, 孙公权1, 赵新生1, 孙丕昌1, 杨少华1, 辛勤1   

    1. 中国科学院大连化学物理研究所, 大连 116023;
    2. 沈阳理工大学环境与化工学院, 沈阳 110168;
    3. 中国科学院研究生院, 北京 100039
  • 收稿日期:2006-07-12 修回日期:1900-01-01 出版日期:2007-05-10 发布日期:2007-05-10
  • 通讯作者: 辛勤

Degradation of Electrocatalysts Performance in Direct Methanol Fuel Cells

CHEN Wei-Min1,2,3, SUN Gong-Quan1, ZHAO Xin-Sheng1, SUN Pi-Chang1, YANG Shao-Hua1, XIN Qin1*   

    1. Dalian Institute of Chemical Physics, CAS, Dalian 116023, China;
    2. School of Environmental and Chemical Engineering, Shenyang Institute of Technology, Shenyang 110168, China;
    3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
  • Received:2006-07-12 Revised:1900-01-01 Online:2007-05-10 Published:2007-05-10
  • Contact: XIN Qin

PDF (PC)

被引次数

16

摘要： 通过单电池放电试验, 考察了直接甲醇燃料电池(DMFC)电催化剂的性能衰减情况. 透射电镜(TEM)和X射线衍射分析(XRD)结果表明, 放电试验后阳极电催化剂的粒径变化很小, 而阴极电催化剂的粒径则显著增大. DMFC内部的液相环境是促使Pt粒子聚结的主要原因. 阳极催化剂中Ru的存在抑制了Pt粒子的生长. 阳极和阴极电催化剂的电化学表面积(ECSA)在放电后都有所降低, 且下降幅度均高于比表面积(SSA)的下降幅度. 放电过程中阳极电催化剂发生了Ru的流失.

关键词: 直接甲醇燃料电池, 电催化剂, 放电试验, 性能衰减

Abstract: A discharge test was conducted to evaluate the degradation of the performance of electrocatalysts in direct methanol fuel cells(DMFCs). The results of transmission electron microscopy(TEM) and X-ray diffraction(XRD) analyses show that after the test, the mean particle size of the anode electrocatalyst did not change, while that of the cathode electrocatalyst increased remarkably. The main reason for the sintering of electrocatalysts is the existence of liquids. Amorphous Ru species in the anode catalyst inhibit the growing of Pt crystallites. The electrochemical surface area(ECSA) decreased after the discharge test, with a degree higher than the specific surface area(SSA), both for the anode and the cathode. Part of ruthenium was lost from the anode electrocatalyst during the discharge test.

Key words: Direct methanol fuel cell(DMFC), Electrocatalyst, Discharge test, Performance degradation

中图分类号: 

TrendMD: