High‐Entropy Cathodes for Proton‐Conducting Solid Oxide Fuel Cells: A Promising Yet Uncharted Frontier

ABSTRACT Proton‐conducting solid oxide fuel cells (H‐SOFCs) retain the advantages of traditional SOFCs while operating at lower temperatures, attracting significant attention for efficient power generation. However, this temperature reduction inherently slows the cathode oxygen reduction reaction (ORR) kinetics. Although high‐entropy oxides present a breakthrough strategy for developing high‐performance cathodes in H‐SOFCs, key challenges persist, which are highlighted in this perspective.