Three-Dimensional Flower-Like Bimetallic Nickel–Iron Selenide for Efficient Oxygen Evolution Reaction
Zheng Chen, Tao Zhou, Qian Liu, Zihao Wang, Ruizhe Gu, Lingyun Guo, Yongsheng Liu
Abstract
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.