| 直接甲醇燃料电池膜电极性能衰退原因的分析 |
| |
| 引用本文： | 赵新生,樊小颖,汪国雄,王素力,孙海,衣宝廉,辛勤,孙公权. 直接甲醇燃料电池膜电极性能衰退原因的分析[J]. 电源技术, 2005, 29(4): 227-230 |
| |
| 作者姓名： | 赵新生 樊小颖 汪国雄 王素力 孙海 衣宝廉 辛勤 孙公权 |
| |
| 作者单位： | 中国科学院大连化学物理研究所,辽宁,大连,116023 |
| |
| 基金项目： | 国家高技术研究发展计划(863计划);国家自然科学基金;中国科学院知识创新工程项目 |
| |
| 摘 要： | 分析了直接甲醇燃料电池在长时间运行过程中膜电极(Membraneelectrodeassembly,MEA)性能衰退的原因。电池经过86h的恒电流放电后,比功率由130mW·cm-2降为100mW·cm-2,现场(In-Situ)交流阻抗技术对电池放电全程监测的结果显示了电池的欧姆电阻、电荷转移电阻和传质阻力随放电时间的延长逐渐增大;循环伏安测试的结果表明,放电后电极的有效电化学反应表面积有所减小;通过扫描电子显微镜(SEM)观察了放电后MEA断面形貌,发现催化层与Nafion膜间存在明显剥离,增大了质子传导阻力。上述因素的综合作用导致了膜电极的衰退。
|
| 关 键 词： | 直接甲醇燃料电池 膜电极 性能衰退 交流阻抗谱 |
| 文章编号： | 1002-087X(2005)04-0227-04 |
| 修稿时间： | 2004-06-22 |
Investigation of performance degradation of electrodes in direct methanol fuel cell |
| |
| ZHAO Xin-sheng,FAN Xiao-ying,WANG Guo-xiong,WANG Su-li,SUN Hai,YI Bao-lian,XIN Qin,SUN Gong-quan. Investigation of performance degradation of electrodes in direct methanol fuel cell[J]. Chinese Journal of Power Sources, 2005, 29(4): 227-230 |
| |
| Authors: | ZHAO Xin-sheng FAN Xiao-ying WANG Guo-xiong WANG Su-li SUN Hai YI Bao-lian XIN Qin SUN Gong-quan |
| |
| Abstract: | A direct methanol fuel cell showed a rapid decay in performance after continuous operation of 86 h.Various analysis tools including electrochemical impedance spectroscopy (EIS), cyclic voltammogram (CV), scanning electronic microscopy (SEM) were used to investigate the causes of performance degradation of the single cell during its long-term operation. The EIS results showed that ohm resistance, charge transfer resistance and mass transport resistance increased with discharging time. The active surface area of electrodes was reduced after life test. Compared to the cross-section image of that before test, the delamination in MEA was found after 86 h operation. |
| |
| Keywords: | direct methanol fuel cell membrane electrode assembly performance degradation impedance spectroscopy |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
