Translating the Optimized Durability of Co‐Based Anode Catalyst into Sustainable Anion Exchange Membrane Water Electrolysis

Abstract Development of robust electrocatalysts for the oxygen evolution reaction (OER) underpins the efficient production of green hydrogen via anion exchange membrane water electrolysis (AEMWE). This study elucidates the factors contributing to the degradation of cobalt‐based (Co‐based) OER catalysts synthesized via electrodeposition, thus establishing strategic approaches to enhance their longevity. Systematic variations in the electroplating process and subsequent heat treatment reveal a delicate balance between catalytic activity and durability, substantiated by comprehensive electrochemical assessments and material analyses. Building upon these findings, the Co‐based anode is successfully optimized in the AEMWE single‐cell configuration, showcasing an average degradation rate of 0.07 mV h −1 over a continuous operation for 1500 h at a current density of 1 A cm −2 .