Redox‐Reversible Iron Orthovanadate Cathode for Solid Oxide Steam Electrolyzer

Abstract

<b>A redox-reversible iron orthovanadate cathode</b> is demonstrated for a solid oxide electrolyser with up to 100% current efficiency for steam electrolysis. The iron catalyst is grown on spinel-type electronic conductor FeV₂O₄ by in situ tailoring the reversible phase change of FeVO₄ to Fe⁺FeV₂O₄ in a reducing atmosphere. Promising electrode performances have been obtained for a solid oxide steam electrolyser based on this composite cathode.