Construction of 2D heterostructure FeP-CoP/MoO nanosheets for efficient oxygen evolution reaction

The oxygen evolution reaction (OER) plays a pivotal role in diverse electrochemical conversion applications, such as water splitting and metal-air batteries. Nevertheless, the formation of several active sites in catalysts made of non-noble metals continues to encounter notable obstacles. To tackle this challenge, a 2D heterostructure catalyst composed of Fe 2 P-CoP 2 /MoO x nanosheets was designed. The cobalt molybdate (CoMoO 4 ) nanosheets and their supported FeOOH nanoflakes were in situ transformed into 2D heterostructure Fe 2 P-CoP 2 /MoO x nanosheets via a simple hydrothermal and phosphorization process. Note that the 2D MoO x nanosheets significantly enhance the electrochemically active surface area (ECSA), and there is a synergistic effect between cobalt phosphide (CoP 2 ) and iron phosphide (Fe 2 P) nanoparticles, improving the OER reaction activity. When the electrocatalyst was employed for the OER, the Fe 2 P-CoP 2 /MoO x nanosheets exhibit remarkable OER efficiency, reducing overpotentials to as low as 235 mV at a current density of 50 mA cm −2 , accompanied by a Tafel slope of 33.32 mV dec −1 , along with exceptional enduring stability. The synthesis of the 2D heterostructure Fe 2 P-CoP 2 -MoO x nanosheets and their remarkable OER performance represent substantial advancements in developing electrocatalysts that are productive and stable in sustainable energy conversion and storage applications. 2D heterostructure Fe 2 P-CoP 2 /MoO x nanosheets on NF were synthesized by simple hydrothermal and phosphorization methods and exhibit remarkable OER performance.