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a) Current–voltage curves of the solid oxide electrolyzers with cathodes fed by 5%H2O/5%H2/Ar and 5%H2O/Ar, respectively, at 800 ºC. b) AC impedance spectra of the solid oxide electrolyzers with 5%H2O/Ar in FeVO4 cathode under different applied voltages at 800 ºC.
