Abstract Design and synthesis of noble-metal-free bifunctional catalysts for efficient and
robust electrochemical water splitting are of significant importance in developing clean and
renewable energy sources for sustainable energy consumption. Herein, a simple three-step
strategy is reported to construct cobalt-iron nitride/alloy nanosheets on nickel foam (CoFe-
NA/NF) as a bifunctional catalyst for both hydrogen evolution reaction (HER) and oxygen
evolution reaction (OER). The electrocatalyst with optimized composition (CoFe-NA2/NF) …