Studies on performance degradation of a direct methanol fuel cell (DMFC) in life test

被引：139

作者：

Liu, JG ^{[1
]}

Zhou, ZH ^{[1
]}

Zhao, XX ^{[1
]}

Xin, Q ^{[1
]}

Sun, GQ ^{[1
]}

Yi, BL ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Lab, Dalian 116023, Peoples R China

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2004年 / 6卷 / 01期

关键词：

D O I：

10.1039/b313478d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A 75 h life test of a direct methanol fuel cell (DMFC) at a low current density of 100 mA cm(-2) was carried out. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied to characterize the membrane electrode assembly (MEA) during the life test. The EIS results showed that the high frequency cell impedance of the MEA increased from 0.26 ohm cm(2) at the beginning of the life test to 0.37 ohm cm(2) at the end. SEM images of the MEA in cross-section apparently demonstrated the delamination of the electrodes from the membrane after the life test. TEM analysis of the electrocatalysts in the pre- and post-test cell revealed that the agglomeration of the metal particles in the anode was more serious than in the cathode. The results indicate that the agglomeration of electrocatalysts together with the delamination of the MEA concurrently contribute to the performance degradation of the DMFC.

引用

页码：134 / 137

页数：4

共 14 条

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