Preparation of Trimetallic‐Organic Framework Film Electrodes via Secondary Growth for Efficient Oxygen Evolution Reaction

Abstract Metal–organic frameworks (MOFs) are promising electrocatalysts for clean energy conversion systems. However, developing MOF‐based electrodes with high performance toward oxygen evolution reaction (OER) is still challenging. In this work, a series of MOF film electrodes derived from Ni‐btz were prepared by employing the secondary growth strategy under solvothermal conditions. Fe and Co ions were also incorporated into the Ni‐btz framework to produce a trimetallic coupling effect to obtain enhanced OER activity. The as‐prepared FeCoNi‐btz/NF exhibited not only good stability but also excellent OER performance under alkaline conditions. Furthermore, the possible intermediates including metal oxides and metal oxyhydroxides were confirmed by X‐ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM).