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Nickel sulfide microsphere film on Ni foam as an efficient bifunctional electrocatalyst for overall water splitting
Wenxin Zhu1, Xiaoyue Yue, Wentao Zhang
1College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China. wanglong79@nwsuaf.edu.cn.
Abstract:
Developing low-cost, efficient, and bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an appealing yet challenging task. Herein, for the first time, a NiS microsphere film was grown in situ on Ni foam (NiS/Ni foam) via a sulfurization reaction as an efficient bifunctional electrocatalyst for overall water splitting with superior activity and good durability. This NiS/Ni foam electrode delivers 20 mA cm(-2) at an overpotential of 158 mV for the HER and 50 mA cm(-2) at an overpotential of 335 mV for the OER in 1.0 M KOH. This bifunctional electrode also enables a high-efficiency alkaline water electrolyzer with 10 mA cm(-2) at a cell voltage of only 1.64 V, which could be promising in water splitting devices for large-scale hydrogen production.
