Fe/Ce Co-Doped Ni2p Catalyst to Enhance Alkaline Oxygen Evolution Reaction

Abstract

Developing efficient oxygen evolution reaction (OER) catalysts is crucial for electrolyzing water to produce hydrogen, addressing the shortage of traditional fossil fuels. Transition metal phosphides (TMPs) are promising electrocatalysts for OER. However, their development is limited by poor conductivity and durability. In this study, a Fe/Ce-Ni2P electrocatalyst with a coral-like structure was synthesized using hydrothermal tube furnace annealing and phosphating methods. The optimized Fe/Ce-Ni2P exhibited robust stability over 100 hours, providing current densities of 50 and 200 mA cm-2 at overpotentials of 250 and 310 mV, respectively, which are 80 and 160 mV lower than those of pure Ni2P. The excellent electrocatalytic oxygen evolution performance of Fe/Ce-Ni2P can be attributed to the synergistic effects of Fe doping and Ce doping. Specifically, Fe doping significantly enhances conductivity and oxygen evolution activity, while Ce doping improves stability. This study introduces a simple and straightforward synthesis strategy, providing a new approach to develop stable and efficient dual heteroatom-doped catalysts.

Keywords: Key Work:Ni2P, Rare earth, Fe/Ce co-doping, OER