This chapter is devoted to various aspects of the degradation of polymer electrolyte fuel cells it describes an approach to this issue using computer modeling this approach is a very effective and powerful tool for two main reasons firstly degradation issues in polymer electrolyte fuel cells pefcs are very complex. Polymer electrolyte fuel cell degradation performance decay in a polymer electrolyte fuel cell can result from changes in the gas diffusion layer particularly in the microporous layer . Hydrogen gas crossover measurements and durability tests of a single cell under open circuit conditions were carried out to investigate membrane degradation in polymer electrolyte fuel cells pefcs. Now that fuel cells are in commercial production in the rest of the world if not in the us one of the questions that remain is the long term durability of fuel cell systems here researchers review the current understanding of the durability of polymer electrolyte fuel cells. Clarification of the mechanism of degradation of model compounds for polymers used in polymer electrolyte fuel cells may identify intermediates that propagate damage such knowledge can be used to
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