Microscopic characterizations of membrane electrode assemblies prepared under different hot-pressing conditions

被引：49
作者：
Liang, Z. X. [1 ]
Zhao, T. S. [1 ]
Xu, C. [1 ]
Xu, J. B. [1 ]
机构：
[1] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2007年 / 53卷 / 02期
关键词：
membrane electrode assembly (MEA); durability; delamination; hot-pressing; direct methanol fuel cell (DMFC);
D O I：
10.1016/j.electacta.2007.07.071
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The durability of the membrane electrode assembly (MEA) for direct methanol fuel cells (DMFCs) is one of the most critical issues to be addressed before widespread commercialization of the DMFC technology. In this work, we investigated the effect of the hot-pressing duration on the performance and durability of the MEA prepared by hot-pressing technique. It was found that the 60-min hot pressing at 135 degrees C under the pressure of 4.0 MPa yielded a significantly improved MEA durability than did the 3-min hot pressing (a typical duration in practice) under the same condition, but no substantial difference was found in the cell performance of the MEAs prepared with the two different hot-pressing durations. The reason why the hot-pressing duration had no significant effect on cell performance is explained based on X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) characterizations of the changes in the physiochemical properties of MEAs and their constituent components, including the anode, cathode and Nation membrane, before and after hot pressing with different durations. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：894 / 902
页数：9
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