Abstract
Chemical and mechanical durability of polymer electrolyte membrane (PEM) must be understood and improved for commercial success of PEMFCs vehicles. Chemical degradation of PEMs occurs under OCV conditions due to high gas crossover, high concentration of chemically weak groups, and low EW. These properties measured ex-situ have been related to develop a chemical stability factor (CSF) to predict in-situ chemical durability of PEMs. Mechanical degradation of PEMs occurs under dry-wet cycling due to low tensile strain, high swelling, low EW and high gas crossover. A mechanical stability factor (MSF) has been derived from ex-situ measured % Strain at Break, % Swelling, oxygen crossover rate, and EW to predict in-situ mechanical durability of PEMs. The relative trend predicted by CSF and MSF follows the relative trend in in-situ chemical and mechanical durability. These factors can be used to screen and select the most durable PEM for in-situ testing in order to save lengthy in-situ testing time, developmental cost and resources.
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