Fe/Ce Codoped Ni₂P Catalyst to Enhance Alkaline Oxygen Evolution Reaction

Creating effective oxygen evolution reaction (OER) catalysts is crucial for advancing water electrolysis and hydrogen generation, thereby mitigating the depletion of conventional fossil fuels. This study prepared a Fe/Ce–Ni2P electrocatalyst with a coral-like structure by hydrothermal and low-temperature phosphating methods. The catalyst demonstrated exceptional performance, achieving current densities of 50 and 200 mA cm–2 at overpotentials of 250 and 310 mV, respectively─significantly outperforming pure Ni2P by 80 and 160 mV. Specifically, Fe doping significantly enhances conductivity and oxygen evolution activity, while Ce doping improves stability. The Fe/Ce–Ni2P catalyst exhibited outstanding stability over 100 h, a testament to the synergistic effects of Fe and Ce doping. This work introduces a simple and scalable synthesis strategy, offering a promising approach to developing robust dual-heteroatom-doped catalysts for OER applications.