Morphology engineering is an effective means to improve the performance of electrocatalysts. Herein, the controlled synthesis of hierarchical hollow cobalt layered-double-hydroxide (CoLDH) nanocages was realized via etching the metal − organic frameworks (MOFs) for oxygen evolution reaction (OER). The etching process of MOFs into hollow CoLDH nanocages was investigated in detail, and the results demonstrate that the structure and morphology of the electrocatalysts could be regulated by the concentration of Co²⁺ cation. The obtained hollow CoLDH nanocages have obvious mesoporous characteristics and high electrochemical active surface areas by precise regulation. Benefiting from their unique hollow nano-architecture, the CoLDH electrocatalysts exhibit excellent electrocatalytic activity for OER in alkaline electrolyte, achieving a low overpotential of 290 mV at a current density of 10 mA cm⁻² and a good stability. The present work provides a feasible strategy for optimizing the structure and morphology of the electrocatalyst materials and in-depth understanding of their electrocatalytic activity.

形态工程学是提高电催化剂性能的有效手段。在此，通过蚀刻用于氧释放反应（OER）的金属有机骨架（MOF），实现了分层空心钴双氢氧化物（CoLDH）纳米笼的受控合成。详细研究了MOFs在空心CoLDH纳米笼中的刻蚀过程，结果表明，Co ²⁺的浓度可以调节电催化剂的结构和形貌。阳离子。通过精确调节，所获得的空心CoLDH纳米笼具有明显的介孔特性和高电化学活性表面积。得益于其独特的中空纳米结构，CoLDH电催化剂对碱性电解质中的OER表现出出色的电催化活性，在10 mA cm ^-2的电流密度下实现了290 mV的低过电势并具有良好的稳定性。本工作为优化电催化剂材料的结构和形态以及深入了解其电催化活性提供了可行的策略。