In Situ Grown CoMnBased Metal–Organic Framework on Nickel Foam as Efficient and Robust Electrodes for Electrochemical Oxygen Evolution Reaction

Abstract

It is of great significance to develop efficient and robust oxygen evolution reaction (OER) electrocatalysts based on inexpensive and earthabundant materials to enable water splitting as a future renewable energy source. Herein, the in situ grown CoMnMOF74 on nickel foam and their use as active electrodes for highperformance wateroxidation catalysis are reported. In alkaline media, the binderfree threedimensional (3D) electrode shows superior OER activity with a current density of 10 mA cm−2 at a small overpotential of 260 mV, a Tafel slope of 58.2 mV dec−1, as well as excellent stability, making it one of the most active OER catalyst. Such high performance is attributed to increased electrochemically active areas, accelerated electron transport capability and the synergy between metal–organic framework (MOFs) and Ni substrate. This work elucidates a promising electrode for electrochemical water oxidation and enriches the direct application of MOF materials for future clean energy conversion and storage systems.