The rational design of advanced nanostructures for catalysts to fully expose the edge or corner sites is highly desirable to optimize their electrocatalytic performance. In this work, we report an edge-enriched (EE) NiFe-layer double hydroxide (LDH) nanoarray with abundant coordinatively unsaturated sites, which was synthesized by a structure inheritance strategy using metal-organic framework (MOF) nanosheet array as a structure-directing template. Impressively, the obtained EE-NiFe-LDH nanosheet array offers high electrocatalytic activity in oxygen evolution reaction (OER) with an overpotential of only 205 mV to reach a current density of 10 mA cm⁻², outperforming all reported NiFe-LDH nanostructures. X-ray absorption spectroscopy and density functional theory calculations demonstrate that the exposed edges in EE-NiFe-LDH contain abundant iron and oxygen vacancies, which optimized the electronic state of the NiFe-LDH and enhanced the adsorption of oxygenated intermediates, resulting in the high catalytic activity for OER.

合理设计用于催化剂的先进纳米结构以完全暴露边缘或角落位置对于优化其电催化性能是非常理想的。在这项工作中，我们报告了一种具有丰富配位不饱和位点的边缘富集（EE）NiFe层双氢氧化物（LDH）纳米阵列，它是通过结构继承策略合成的，使用金属有机骨架（MOF）纳米片阵列作为结构-指导模板。令人印象深刻的是，所获得的 EE-NiFe-LDH 纳米片阵列在析氧反应 (OER) 中具有高电催化活性，过电位仅为 205 mV，电流密度达到 10 mA cm ^-2，优于所有报道的 NiFe-LDH 纳米结构。X 射线吸收光谱和密度泛函理论计算表明，EE-NiFe-LDH 的暴露边缘含有丰富的铁和氧空位，优化了 NiFe-LDH 的电子态并增强了含氧中间体的吸附，导致高OER 的催化活性。