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Proton conducting Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 is employed as a potential steam electrolysis electrolyte for hydrogen production at intermediate temperature.

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The in uences of In-and Y-doping on the electrical conduction properties of barium zirconate were investigated. The electrical conductivity measured on of BaZr 1−x−y In x Y y O 3−δ (x = 0, 0.1, 0.2 and y = 0, 0.1, 0.2) could be understood that yttrium doping causes high bulk conductivity and indium doping leads to lowering activation energy of the grain boundary. Co-doping of yttrium and indium promotes the enhancement effect of improving the bulk conductivity and lowering of activation energy, and it is thus expected that the co-doping with yttrium and indium can work for controlling the bulk and grain boundary conduction speci cally in the materials.