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• W2734851594 abstract "Abstract Development of thermally stable polymer electrolyte membranes with higher proton conductivity as well as mechanical stability is a key challenge in commercializing PEM fuel cells operating above 100 °C. Polybenzimidazole (PBI) membrane is one of the promising candidates in this category although with limited mechanical stability and moderate proton conductivity. To improve the proton conductivity, porous PBI was an effective way. For the preparation of porous PBI membranes, glucose and saccharose are selected as porogen and added in PBI resin solution before solvent casting. The porous PBI membrane prepared has high contents of acid doping at room temperature, as well high proton conductivity. The acid doping level is up to 15.7 mol H3PO4 per PBI repeat unit, much higher than pure PBI membrane at the same condition. Further, membrane electrode assembly (MEA) is fabricated with porous PBI membranes doped with phosphoric acid and tested at 150 °C with dry hydrogen and oxygen gas at ambient pressure for both anode and cathode feeds. During 200 h stability testing under a constant current discharge of 0.5 A cm −2 , the cell performance remains stable except for the last 50 h. The high-frequency resistance and the charge-transfer resistance were measured to explore the decay mechanism occurring in the last 50 h." @default.
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• W2734851594 date "2017-07-01" @default.
• W2734851594 modified "2023-09-23" @default.
• W2734851594 title "WITHDRAWN: Porous polybenzimidazole membranes doped with phosphoric acid: Preparation and application in high temperature PEM fuel cells" @default.
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• W2734851594 doi "https://doi.org/10.1016/j.ijhydene.2017.06.227" @default.
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