Electrodeposited Ni‐P Alloy Nanoparticle Films for Efficiently Catalyzing Hydrogen‐ and Oxygen‐Evolution Reactions

Development of earth‐abundant bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is highly desirable but still remains a great challenge. In this Communication, we demonstrate that a Ni‐P alloy nanoparticle film electrodeposited on Ni foam (Ni‐P/NF) acts as an efficient bifunctional water‐splitting electrocatalyst with strong durability in alkaline media. This electrode needs overpotentials of 80 and 309 mV to drive 10 mA cm −2 for HER and OER, respectively, in 1.0 m KOH, and its two‐electrode water electrolyzer requires voltage of 1.67 V to reach 10 mA cm −2 .