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To enhance anhydrous proton conductivity of high‐temperature proton exchange membranes (PEMs), we report here the realization of H3PO4‐imbibed three‐dimensional (3D) polyacrylamide‐graft‐starch (PAAm‐g‐starch) hydrogel materials as high‐temperature PEMs using the unique absorption and retention of crosslinked PAAm‐g‐starch to concentrated H3PO4 aqueous solution. The 3D framework of PAAm‐g‐starch matrix...
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