Highly Active Nanostructured NiCoMo-Based Catalyst for Oxygen Evolution in Anion-Exchange Membrane Water Electrolysis

Abstract

Here, we demonstrate high-performance and durable anion-exchange membrane (AEM) water electrolysis using a NiCoMo-based anode catalyst structured with a crystalline metal core and an amorphous oxide surface that enables high activity for oxygen evolution reaction. An in-house-developed quaternized poly(aryleneperfluoroalkylene) membrane is used as the AEM. The resulting electrolyzer exhibits a current density of 1 A cm–2 at 1.63 V (voltage efficiency of 91%) and 80 °C with a demonstrated stability of more than 500 h. Such a high performance even exceeds state-of-the-art proton-exchange membrane electrolysis using noble-metal catalysts.