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a) Schematic diagram of MEA with detailed three‐phase boundaries, b) H2 permeability, c) water vapor permeability of PDTP‐x and PFBP [23] AEMs in I− form at different RHs at 60 °C, and d) OH− conductivity of PDTP‐x at different RH values (0 %, ≈25 %, ≈50 %, ≈75 %, ≈100 %) at 60 °C.
