期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 631, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127689
关键词
Ni3S2/Co3S4/FeOOH heterostructure; Flower-like microspheres; Hydrothermal synthesis; Bifunctional electrocatalyst; Overall water splitting
资金
- National Natural Science Foundation of China [21875091]
- Natural Science Foundation of Jiangsu Province [BK20171295]
The synthesized Ni3S2/Co3S4/FeOOH flower-like microspheres exhibit excellent catalytic performance for oxygen and hydrogen evolution reactions, serving as an efficient electrode for overall water splitting with low overpotentials and good long-term stability. The synergistic effect of different functional components and unique hierarchical structure contribute to the superior electrocatalytic performances compared to individual Ni3S2, Ni3S2/Co3S4 and Ni3S2/FeOOH components.
Overall water splitting using highly effective and low-cost bifunctional electrocatalysts is a promising method for hydrogen production. Herein, Ni3S2/Co3S4/FeOOH flower-like microspheres composed of Ni3S2/Co3S4 nanosheets and FeOOH nanoparticles are in-situ generated on Ni foam (NF) by a facile one-step hydrothermal approach. The NF-supported Ni3S2/Co3S4/FeOOH can serve as an efficient binder-free bifunctional electrode for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline medium. The overpotentials at current density of 10 mA cm(-2) are 158 and 181 mV for HER and OER, respectively. Moreover, the electrode exhibits remarkable performance for overall water splitting, requiring only a low voltage of 1.58 V to achieve the current density of 10 mA cm(-2), and displaying a good long-term stability. The synergistic effect of different functional components and the unique hierarchical structure are responsible for the superior electrocatalytic performances of Ni3S2/Co3S4/FeOOH compared to Ni3S2, Ni3S2/Co3S4 and Ni3S2/FeOOH.
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