Electrodeposited NiCoFeMnNbP High‐Entropy Alloy Phosphide as Efficient and Stable Bifunctional Electrocatalysts for Anion‐Exchange Membrane Water Splitting

The high‐entropy alloy phosphides with high stability and cost‐effectiveness are considered as promising bifunctional catalysts in anion exchange membrane water electrolyzers. Herein, the high‐entropy NiCoFeMnNbP alloy is deposited on nickel foam through the electrodeposition method. The NiCoFeMnNbP exhibits an overpotential of 119 mV at 10 mA cm −2 for hydrogen evolution reaction and 348 mV at 100 mA cm −2 for oxygen evolution reaction, respectively. The anion exchange membrane electrolyzer based on NiCoFeMnNbP achieves a voltage of 2.38 V at 2 A cm −2 and stably operates over 24 h at 1 A cm −2 .