催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (8): 703-708.

• 研究论文 • 上一篇    下一篇

直接甲醇燃料电池催化剂性能的影响因素

陈维民1,2,3,孙公权1,毛庆1,3,杨少华1,孙丕昌1,辛勤1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 沈阳理工大学环境与化工学院, 辽宁沈阳 110168; 3 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-08-25 出版日期:2007-08-25 发布日期:2011-08-19

Factors Influencing the Performance of Catalysts in Direct Methanol Fuel Cells

CHEN Weimin1,2,3, SUN Gongquan1, MAO Qing1,3, YANG Shaohua1, SUN Pichang1, XIN Qin1*   

  1. 1 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110168, Liaoning, China; 3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-08-25 Online:2007-08-25 Published:2011-08-19

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摘要： 考察了温度、电位及中间产物等因素对直接甲醇燃料电池催化剂性能的影响. 结果表明,温度的升高会显著促进Pt催化剂粒子的聚结. 对于PtRu催化剂, Ru氧化物/水合氧化物对Pt微晶的聚结具有抑制作用. 高温放电实验后, PtRu催化剂的合金化程度有所提高. 高电位会加速电催化剂的降解. 电极反应中间产物甲酸和甲醛对甲醇电催化氧化反应具有一定的抑制作用,其中甲醛的影响更大.

关键词: 直接甲醇燃料电池, 电催化剂, 性能衰减, 温度, 电位

Abstract: Several factors including temperature, potential, and intermediates that influence the performance of electrocatalysts in direct methanol fuel cells were examined. The results show that the sintering process of Pt catalyst particles was accelerated at high temperatures, and for PtRu catalysts, this process was largely inhibited by ruthenium oxides/hydroxides. The alloying degree of PtRu catalysts was elevated to some extent after the discharge test at a high temperature. The degradation of electrocatalysts was accelerated by high potential. The methanol oxidation reaction was hindered to some extent by intermediates such as formic acid and formaldehyde, especially the latter.

Key words: direct methanol fuel cell, electrocatalyst, performance degradation, temperature, potential