One promising approach to improving the slow reaction dynamics of alkaline oxygen evolution reaction (OER) is to construct non-precious metal-based heterojunctions via interface engineering. In this work, the relationship between structure and activity for one-dimensional CoSe₂/FeSe₂ nanomaterials for OER is discussed in detail by experimental techniques, coupled with the density functional theory calculations. Capitalizing on the refined electronic structure layout and abundant heterogeneous interfaces, the hierarchical branched CoSe₂/FeSe₂ heterojunctions demonstrate the outstanding electrocatalytic activity for OER in 1 M KOH solution, and can achieve low overpotentials of 283 and 330 mV at current densities of 10 and 100 mA cm⁻², respectively, as well as keeping 94.7 % of its initial activity after 100 h cycles. Furthermore, it is found that the enhanced inherent catalytic performance of CoSe₂/FeSe₂ electrocatalyst after standardizing the current density with electrochemically active surface area (ECSA) could be attributed to the robust interaction at the interface induced by the construction of the heterojunctions. This work presents the significance of manipulating the electronic structure of electrocatalysts utilizing interface design to enhance OER catalytic activity, and provides new insights for exploring the highly active electrocatalysts.

改善碱性析氧反应（OER）缓慢反应动力学的一种有前途的方法是通过界面工程构建非贵金属基异质结。在这项工作中，通过实验技术结合密度泛函理论计算，详细讨论了用于OER的一维CoSe ₂ /FeSe _{2纳米材料的结构和活性之间的关系。}利用精细的电子结构布局和丰富的异质界面，分级支化CoSe ₂ /FeSe ₂异质结在1 M KOH溶液中表现出出色的OER电催化活性，并且在10和10的电流密度下可以实现283和330 mV的低过电势。分别为100 mA cm ^-2，并在100小时循环后保持其初始活性的94.7%。 此外，我们发现，在用电化学活性表面积（ECSA）标准化电流密度后，CoSe ₂ /FeSe ₂电催化剂固有催化性能的增强可归因于异质结构建引起的界面处的强相互作用。这项工作展示了利用界面设计操纵电催化剂的电子结构来增强OER催化活性的意义，并为探索高活性电催化剂提供了新的见解。