In Situ Exsolved CoFeRu Alloy Decorated Perovskite as An Anode Catalyst Layer for High‐Performance Direct‐Ammonia Protonic Ceramic Fuel Cells

Abstract Direct‐ammonia proton ceramic fuel cell (DA‐PCFC) is a promising clean energy technology because ammonia (NH₃) is easier to store, transport, and handle than hydrogen. However, NH₃ decomposition efficiency is unsatisfactory, and the anti‐sintering resistance of conventional Ni‐based ceramic anodes has limited the large‐scale application of DA‐PCFC technology. Herein, Pr_0.6Sr_0.4(Co_0.2Fe_0.8)_0.85Ru_0.15O_3‐δ (PSCFR15), a novel anode catalyst layer (ACL) material is developed. PSCFR15 is treated under a reducing atmosphere to form a composite with CoFeRu alloy nanoparticles. Density functional theory simulations reveal that Ru modification in the CoFe alloy promotes nitrogen desorption during ammonia decomposition reaction, thereby boosting ammonia decomposition efficiency. As a result, DA‐PCFC with PSCFR15 ACL can achieve superior peak power density compared to bare DA‐PCFC operated with H₂ and NH₃ fuels. Furthermore, the ACL also reduces the direct contact between the Ni‐based ceramic anode and the NH₃ fuel, then suppressing Ni sintering, and enhancing the durability of the DA‐PCFC.