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

Abstract

It\nis of great significance to design an efficient and low-cost\noxygen evolution reaction (OER) electrocatalyst for water splitting\nto utilize hydrogen energy. In this work, three-dimensional flower-like\nbimetallic Ni–Fe selenide electrocatalysts were successfully\nfabricated on nickel foam by a facile one-step chemical bath method.\nBenefiting from the bimetal synergistic effect of Ni/Fe bimetal and\na large electrochemically active surface area provided by the unique\nthree-dimensional flower-like structure and improved conductivity\nof metal selenides, the as-prepared Ni_0.2Fe_0.8Se–Se/NF exhibits good OER activity, that is, a small overpotential\nof 200 mV at 10 mA cm^–2, a low Tafel slope of 57.7\nmV dec^–1, and high stability of 26 h in 1.0 M KOH.\nThe work may provide a new idea to fabricate other transition-metal-based\ncatalysts for efficient water splitting.