Transition metal based materials with hollow structure are considered as advanced electrocatalysts for oxygen evolution reaction (OER). This study reports the NiCo-LDH nanosheets assembled hollow structure arrays on nickel foam, which are synthesized by solvothermal method with ZnCo-MOF nanopolyhedra as precursors. Taking advantage of the nanosheets constructed hollow structure, the obtained sample exhibits good OER catalysis activity with low overpotential of 303 mV at current density of 100 mA cm⁻² and satisfied stability. It is demonstrated that Ni²⁺ and Co²⁺ are oxidized into Ni³⁺ and Co³⁺, which play as robust catalysis sites and greatly promote the catalysis performance for OER. This work demonstrates a promising strategy for controllable preparation of hollow structures of transition metal materials for electrochemical water splitting.

具有中空结构的过渡金属基材料被认为是用于析氧反应（OER）的先进电催化剂。本研究报道了NiCo-LDH纳米片组装在泡沫镍上的空心结构阵列，该纳米片是通过溶剂热法以ZnCo-MOF纳米多面体为前驱体合成的。利用纳米片构建的中空结构，得到的样品表现出良好的OER催化活性，在100 mA cm ^-2的电流密度下具有303 mV的低过电位和令人满意的稳定性。证明Ni ²⁺和Co ²⁺被氧化成Ni ³⁺和Co ³⁺，它们作为强大的催化位点，极大地提高了 OER 的催化性能。这项工作展示了一种有前途的策略，用于可控制备用于电化学水分解的过渡金属材料的空心结构。