Journal
CHEMSUSCHEM
Volume 8, Issue 6, Pages 1072-1082Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402957
Keywords
durability; fuel cells; iron; membranes; modeling
Funding
- Ballard Power Systems
- Natural Sciences and Engineering Research Council of Canada through an Automotive Partnership Canada (APC) grant
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Chemical membrane degradation through the Fenton's reaction is one of the main lifetime-limiting factors for polymer-electrolyte fuel cells. In this work, a comprehensive, transient membrane degradation model is developed to capture and elucidate the complex insitu degradation mechanism. A redox cycle of iron ions is discovered within the membrane electrolyte assembly, which sustains the Fe-II concentration and results in the most severe chemical degradation at open circuit voltage. The cycle strength is critically reduced at lower cell voltages, which leads to an exponential decrease in Fe-II concentration and associated membrane degradation rate. When the cell voltage is held below 0.7V, a tenfold reduction in cumulative fluoride release is achieved, which suggests that intermediate cell voltage operation would efficiently mitigate chemical membrane degradation and extend the fuel cell lifetime.
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