Strategies for Designing Anti‐Chlorine Corrosion Catalysts in Seawater Splitting

Abstract The seawater splitting for green hydrogen production is emerging as a key research focus for sustainable energy. Nevertheless, the inherent complexity of seawater, with its diverse ion composition – especially chloride ions, calcium ions, and magnesium ions – poses significant challenges in catalyst design. Designing highly active electrocatalysts that can resist chloride ion corrosion during seawater splitting is still a challenge. This article presents an overview of the fundamental mechanisms of seawater splitting and explores issues encountered at both the cathode and the anode electrode. The focus then shifts to chlorine corrosion at the anode, examining recent advances in preventing chlorine corrosion strategies. Notably, these design strategies, such as the anionic passivation layers, corrosion‐resistant metal doping, physical barrier layers, in situ phase transition‐driven seawater desalination, and decoupled seawater splitting, are comprehensively investigated, all of which aim to enhance the catalytic stability in seawater splitting. The review concludes with an outlook on the practical applications and challenges of producing green hydrogen through seawater splitting.