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ABSTRACT Electrochemical water splitting via anion exchange membrane water electrolysis (AEMWE) system offers a sustainable route for converting renewable energy sources into hydrogen. Nevertheless, the practical viability of the AEMWE system is hampered by the sluggish four‐electron oxygen evolution reaction (OER) kinetics of state‐of‐the‐art AEMWE anode materials. Herein, a NiFe(OH) x /PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+ δ (PBSCF) layered double perovskite heterostructure is constructed via a scalable and conformal surface engineering process and is investigated as OER electrocatalyst for AEMWE system. Combined experimental and theoretical analyses reveal that strong interfacial interactions between the NiFe(OH) x layer and the PBSCF perovskite facilitate efficient electron transfer, thereby accounting for the enhanced OER activity of surface engineered NiFe(OH) x /PBSCF. Furthermore, the construction of a dynamically robust NiFe(OH) x interface inhibits amorphization and concurrent precipitation in PBSCF by balancing cation dissolution and re‐deposition under OER operation. Notably, the AEMWE system with the cell configuration of NiFe(OH) x /PBSCF (Anode)|AEM|Pt/C (Cathode) demonstrates an exceptional current density (2.66 A cm −2 at 2.0 V cell ) along with outstanding stability for 1,000 h at a practical current density of 1.0 A cm −2 . This work provides a useful design strategy for developing durable and efficient OER electrocatalysts for AEMWE and related electrochemical energy systems.
Yoon et al. (2026) studied this question.