Abstract
Polymer electrolyte membrane fuel cell (PEMFC) have attracted much interest as energy conversion systems, especially in automobiles and portable applications, in response to mounting environmental problems caused by fossil fuels. Since PEMFC durability is currently an important issue, it is of great importance to closely analyze the membrane of PEMFCs for sign of degradation. In this work, we have performed accelerated degradation tests of a PEMFC using over 100 hours of open circuit operation with both dry and humidified inlet gases. It was of interest to determine which side of the membrane presented the most severe degradation since this indicates the type of degradation mechanism that was occurring. After disassembly of the cell, cross sectional images of the membrane were obtained with scanning electron microscopy. It was found that the anode side showed more significant deterioration than the cathode side in terms of overall membrane thinning.
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