At present, transition metal oxides are the most potential electrocatalytic materials. However, its poor conductivity and few active sites hinder its development in various fields. Therefore, the CoO/MnO heterostructures with abundant oxygen vacancies were prepared on the three-dimensional nickel foam by hydrothermal and vacuum annealed methods. Electrochemical studies reveal that Co:Mn = 1:1@NF has superior electrocatalytic performance with overpotential of 280 mV at current density of 10 mA cm⁻² and Tafel slope of 46.6 mV dec⁻¹ in 1 M KOH. As well, the CoO/MnO heterostructures presents predominant stability for over 25 h. The excellent OER performance of the Co:Mn = 1:1@NF is mainly attributed to the abundant heterostructures, oxygen vacancies and unique porous structure of nanowires and nanosheets. Therefore, this research offers a new idea for the reasonable design of low-cost electrocatalysts.

目前，过渡金属氧化物是最具潜力的电催化材料。但其导电性差、活性位点少等问题阻碍了其在各个领域的发展。因此，通过水热和真空退火方法在三维泡沫镍上制备了具有丰富氧空位的CoO/MnO异质结构。电化学研究表明，Co:Mn = 1:1@NF 具有优异的电催化性能，电流密度为 10 mA cm ^{-2 时的}过电位为 280 mV，塔菲尔斜率为 46.6 mV dec ^-1在 1 M KOH。同样，CoO/MnO 异质结构在超过 25 小时内表现出主要的稳定性。Co:Mn = 1:1@NF 优异的 OER 性能主要归功于纳米线和纳米片丰富的异质结构、氧空位和独特的多孔结构。因此，本研究为低成本电催化剂的合理设计提供了新思路。