One‐Pot Hydrothermal Synthesis of Ni<sub>3</sub>S<sub>2</sub>/MoS<sub>2</sub>/FeOOH Hierarchical Microspheres on Ni Foam as a High‐Efficiency and Durable Dual‐Function Electrocatalyst for Overall Water Splitting
Fan Chen, Xiaoyang Yue, Xiaoping Shen, Jia Cheng, Wentao Ke, Zhenyuan Ji, Aihua Yuan, Guoxing Zhu
Abstract
Abstract Electrochemical water splitting is a valid way for production of the pollution‐free, cost‐effective and sustainable hydrogen energy. Herein, Ni 3 S 2 /MoS 2 /FeOOH hierarchical microspheres constructed by nanobelt building blocks were directly grown on Ni foam via a simple one‐pot hydrothermal approach. Benefitting from the synergistic effect of these components as well as the unique hierarchical microsphere structure, Ni 3 S 2 /MoS 2 /FeOOH exhibits superior dual‐function electrocatalytic activity for water splitting in 1.0 M KOH, with low overpotentials of 219 mV for OER at 100 mA cm −2 and 76 mV for HER at 10 mA cm −2 . The electrolyzer based on the Ni 3 S 2 /MoS 2 /FeOOH electrodes only needs a low cell voltage of 1.52 V to drive water splitting at 10 mA cm −2 , which is comparable to the state‐of‐the‐art Pt−C||IrO 2 couple (1.50 V). The cost‐efficient and high‐performance Ni 3 S 2 /MoS 2 /FeOOH bifunctional electrocatalyst developed in this work exhibits a potential application prospect in industrial hydrogen production.