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- W4311764066 abstract "Phosphoric acid loss poses immense hurdles for the durability of high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs). Here we report quaternary ammonium-biphosphate ion-pair HT-PEMFCs that do not lose phosphoric acids under normal and accelerated stress conditions. Our energetics study explains the acid loss behavior of the conventional phosphoric acid-polybenzimidazole (PA-PBI) system by two mechanisms. If PA loss occurs via acid evaporation, the acid loss is constant over time. On the other hand, when water activity in the PA-PBI system is high, exponential decay of PA loss occurs via the water replacement mechanism. Combined 31P NMR and computational studies show that the proposed ion-pair system has six times higher interaction energy, which allows for containing all PAs in the membrane electrode assemblies under a broad range of operating conditions. In addition, polar interactions between the phosphonic acid ionomer and phosphoric acid explain acid retention in the electrodes of the ion-pair HT-PEMFCs." @default.
- W4311764066 created "2022-12-28" @default.
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- W4311764066 date "2022-12-15" @default.
- W4311764066 modified "2023-10-16" @default.
- W4311764066 title "High Temperature Polymer Electrolyte Membrane Fuel Cells with High Phosphoric Acid Retention" @default.
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- W4311764066 doi "https://doi.org/10.1021/acsenergylett.2c02367" @default.
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