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• W4296009413 abstract "Humidity can affect the attenuation of MEA (membrane electrode assembly), however, the relationship between humidity and MEA decays is complex and ambiguous in realistic application. Herein, we design a simulating automotive protocol, performed on five single fuel cells under RH (relative humidity) 100 %, RH 80 %, RH 64 %, and RH 40 %, RH 10 %, respectively, to study the relationship of MEA decays and humidity and suggest optimized humidity range to extend the durability. With the electrochemical impedance spectroscopy, cyclic voltammetry, X-ray fluorescence, X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy, the four degradation mechanisms about catalyst layer, including Pt dissolution, Pt coarsening, carbon corrosion and ionomer degradation, are observed. Pt coarsening and carbon corrosion are accelerated by higher water content at high humidity. Ionomer degradation and Pt dissolution are enhanced in low humidity. With the linear sweep voltammetry, ion chromatography, nuclear magnetic resonance, tensile test and scan electron microscope, chemical and mechanical degradation in proton exchange membrane are all observed in these five fuels. Chemical degradation, characterized by membrane thinning and more fluoride loss, occurred markedly in RH 10 %. Mechanical degradation, characterized by the non-uniformity thickness and bad mechanical properties, is more pronounced in RH 100 %, RH 80%, RH 64 %. These two degradations are in a moderate level in RH 40 %. The research suggests that the RH range from 64 % to 40 % is conductive to mitigate the degradation of MEAs operated in automotive applications." @default.
• W4296009413 created "2022-09-17" @default.
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• W4296009413 date "2023-04-01" @default.
• W4296009413 modified "2023-09-29" @default.
• W4296009413 title "Experimental investigation on degradation mechanism of membrane electrode assembly at different humidity under automotive protocol" @default.
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• W4296009413 doi "https://doi.org/10.1016/j.cjche.2022.07.035" @default.
• W4296009413 hasPublicationYear "2023" @default.
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