Three-Dimensional Flower-Like Bimetallic Nickel–Iron Selenide for Efficient Oxygen Evolution Reaction

It is of great significance to design an efficient and low-cost oxygen evolution reaction (OER) electrocatalyst for water splitting to utilize hydrogen energy. In this work, three-dimensional flower-like bimetallic Ni–Fe selenide electrocatalysts were successfully fabricated on nickel foam by a facile one-step chemical bath method. Benefiting from the bimetal synergistic effect of Ni/Fe bimetal and a large electrochemically active surface area provided by the unique three-dimensional flower-like structure and improved conductivity of metal selenides, the as-prepared Ni0.2Fe0.8Se–Se/NF exhibits good OER activity, that is, a small overpotential of 200 mV at 10 mA cm–2, a low Tafel slope of 57.7 mV dec–1, and high stability of 26 h in 1.0 M KOH. The work may provide a new idea to fabricate other transition-metal-based catalysts for efficient water splitting.