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The effect of humidity on the chemical stability of two types of membranes ͓i.e., perfluorosulfonic acid type ͑PFSA, Nafion 112͒ and biphenyl sulfone hydrocarbon type, ͑BPSH-35͔͒ was studied by subjecting the membrane electrode assemblies ͑MEAs͒ to open-circuit voltage ͑OCV͒ decay and potential cycling tests at elevated temperatures and low inlet-gas relative humidities. The BPSH-35 membranes showed poor chemical stability in ex situ Fenton tests compared to that of Nafion membranes. However,doi:10.1149/1.2806798 fatcat:h6s57nvuffha5hvi5l44iwwqcq