Femtosecond Laser‐Engineered Oxygen Vacancies Enable Lattice Oxygen‐Driven Oxygen Evolution Reaction for Industrial Water Electrolysis

ABSTRACT Industrial water electrolysis (WE) requires oxygen evolution electrodes that combine intrinsic catalytic activity with efficient mass transport under high current densities. Here, we report a single‐step femtosecond‐laser interfacial engineering strategy to fabricate self‐supporting nickel‐based anodes with hierarchical micro/nano architectures and oxygen‐vacancy‐related surface features. This interfacial design simultaneously provides superhydrophilic/superaerophobic wettability for rapid gas‐liquid transport and modulates surface electronic properties for enhanced oxygen evolution reaction (OER) activity. As a result, the laser‐structured electrode exhibits enhanced OER activity together with robust operational stability under industrially relevant conditions. When integrated into an anion exchange membrane water electrolyzer (AEMWE), the system achieves a voltage of 1.81 V at 1000 mA cm −2 alongside exceptional durability over 1000 h with a negligible voltage decay rate. This scalable laser‐enabled strategy provides a versatile platform for designing efficient and stable electrode for sustainable hydrogen production.