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Humidity dependence at 80°C of (A) storage modulus (E′), (B) loss modulus (E″), and (C) tan δ (= E″/E′) of PEMs. Fenton’s test was conducted by immersing the membrane in Fenton’s solution (aqueous solution containing 3% H2O2 and 2 ppm Fe2+) at 80°C for 1 hour.
