High-Entropy Metal–Organic Framework Arrays Boost Oxygen Evolution Electrocatalysis
Shuaishuai Xu, Ming Li, Haiming Wang, Yuntong Sun, Wanying Liu, Jingjing Duan, Sheng Chen
Abstract
Integrating multiple metals to form high-entropy materials is an efficient strategy to bring about fantastic physicochemical and electrocatalytic properties. Herein, a high-entropy metal–organic framework (HE-MOF) with five metals (Ni, Co, Fe, Zn, and Mo) has been rationally synthesized via a mild solvothermal method. The HE-MOF brings a two-dimensional array structure, which could not only enhance the electrical conductivity but also promote rgw mass transport of reactants, intermediates, and products. Therefore, the electrocatalyst displays excellent electrocatalytic oxygen evolution reaction (OER) activity (requiring the overpotential of 254 mV to achieve a current density of 50 mA cm–2) and long-term stability up to 100 h. Further mechanistic study highlights MO6/MOOH (M = metals) intermediates as the active centers, and the synergy of different metals contrubites to entropy increase effects that drive efficient oxygen evolution. Our strategy could give a broad prospect of engineering cost-effective high-entropy metallic catalysts for broad applications.