High-Efficiency Electrocatalytic Water Oxidation on Trimetal-Based Fe–Co–Cr Oxide

Development of highly active and stable transition-metal catalysts for the oxygen evolution reaction (OER) is vital for electrochemical water splitting. Because of a complex four-electron process during OER, a catalyst with multiple redox sites can accelerate the multielectron transfer processes. Herein, we demonstrate a facile sol–gel method for fabrication of a trimetal-based oxide FeCoCrOx for efficient OER. The FeCoCrOx shows a low overpotential (only 245 mV) at a current density of 10 mA cm–2 and good electrochemical durability in alkaline medium. This work provides an attractive cost-effective strategy for synthesis of multicomponent 3d transition-metal-based catalysts for efficient and durable water oxidation in alkaline media.