Developing efficient and inexpensive OER electrocatalysts is a challenge for overall water splitting. Herein, the heterostructured FeCo LDH@NiCoP/NF nanowire arrays with high performance were rationally designed and prepared using an interface engineering strategy. Benefitting from the special heterostructure between FeCo LDH and NiCoP, the as-synthesized FeCo LDH@NiCoP/NF electrocatalyst exhibits outstanding OER performance with an exceptionally low overpotential of 206 mV to achieve 20 mA/cm² current density in an alkaline electrolyte. Importantly, a cell constructed using the FeCo LDH@NiCoP/NF electrocatalyst as cathode and anode just needs a voltage of 1.48 V at 10 mA/cm², and shows excellent stability over 80 h. Experimental and theoretical results verified that the introduction of NiCoP efficiently regulates the electronic structure of FeCo LDH, which tremendously boosts the conductivity and intrinsic catalytic activity of FeCo LDH@NiCoP/NF electrocatalyst. The present work provides guidance for the preparation of other efficient and cheap electrocatalytic materials.

开发高效且廉价的 OER 电催化剂是整体水分解的挑战。在此，采用界面工程策略合理设计和制备了具有高性能的异质结构 FeCo LDH@NiCoP/NF 纳米线阵列。受益于 FeCo LDH 和 NiCoP 之间的特殊异质结构，所合成的 FeCo LDH@NiCoP/NF 电催化剂表现出出色的 OER 性能，在碱性电解液中具有206 mV 的极低过电位，可实现 20 mA/cm ^{2的电流密度。重要的是，使用 FeCo LDH@NiCoP/NF 电催化剂作为阴极和阳极构建的电池在 10 mA/cm 2}下只需 1.48 V 的电压, 并在 80 小时内表现出出色的稳定性。实验和理论结果证实，NiCoP的引入有效地调节了FeCo LDH的电子结构，极大地提高了FeCo LDH@NiCoP/NF电催化剂的电导率和本征催化活性。本工作为制备其他高效廉价的电催化材料提供了指导。