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Published on: December 6, 2021
Noble-metal-free, atomically thin CuInP2Nx nanosheets as highly efficient, stable, and low-cost electrocatalysts in
Wentao Hou1, Xin Zhou2,3, Tingting Cheng1
1School of Physics, Jiangsu Key Laboratory of Nanotechnology, Eco-materials and Renewable Energy Research Center (ERERC), National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu, 210093, P. R. China. zhouyong1999@nju.edu.cn.
Abstract:
Highly active and durable electrocatalysts for the oxygen evolution reaction (OER) in acidic conditions are highly desired for renewable energy nowadays. In this work, a new type of noble-metal-free, atomically thin CuInP2Nx nanosheets was synthesized through the facile nitridation of the corresponding CuInP2S6 and utilized for electrocatalytic water splitting. The combined merits of metal nitrides and the 2D morphology improved the OER performance, achieving an overpotential of 356 mV at a current density of 10 mA cm-2 and a long-term durability of 60 h in 0.5 M H2SO4 electrolyte. The changes in the electronic structure with the introduction of N in CuInP2Nx efficiently lower the energy barriers of intermediates, especially those of OH* and OOH*, thus causing the OER process to be more thermodynamically favourable. This work may provide inspiration for the exploration of cost-effective, novel transition-metal nitride catalysts with excellent OER performance and stability.
