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

Abstract 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 .