Water splitting is an environmentally friendly method of hydrogen generation. However, it is severely limited by the slow anodic oxygen evolution reaction (OER). Iron-nickel layered double hydroxides (FeNi LDH) are promising electrocatalysts for OER, but their intrinsically low electrical conductivity and activity limit the practical applications. Herein, chromium-doped FeNi LDH nanoarrays in situ vertically grown on the surface of the Ti₃C₂T_x MXene (Cr-FeNi LDH/MXene) are successfully synthesized. Remarkably, the robust interaction and electrical coupling between Cr–FeNi LDH and MXene, as well as conspicuous charge transfer and the oxygen vacancies optimizing the adsorption free energy of intermediates, equip the nanocomposites with brilliant catalytic activity and stability toward OER. Thus, the optimized Cr–FeNi LDH/MXene shows a considerable boost in the OER, which affords low overpotential (232 mV at 10 mA cm⁻²) and excellent durability. This work offers a new path to designing highly efficient and earth-abundant catalysts for water splitting and beyond.

水分解是一种环保的制氢方法。然而，它受到缓慢的阳极析氧反应（OER）的严重限制。铁镍层状双氢氧化物（FeNi LDH）是用于OER的有前途的电催化剂，但其固有的低电导率和活性限制了实际应用。_{在此，铬掺杂的 FeNi LDH 纳米阵列在 Ti 3} C ₂ T _x表面原位垂直生长成功合成了 MXene (Cr-FeNi LDH/MXene)。值得注意的是，Cr-FeNi LDH 和 MXene 之间的强相互作用和电耦合，以及显着的电荷转移和优化中间体吸附自由能的氧空位，使纳米复合材料对 OER 具有出色的催化活性和稳定性。因此，优化的 Cr-FeNi LDH/MXene 在 OER 中显示出显着的提升，这提供了低过电位（10 mA cm ^-2时为 232 mV ）和出色的耐久性。这项工作为设计用于水分解及其他用途的高效和地球丰富的催化剂提供了一条新途径。