期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 150, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2020.109842
关键词
Water splitting; MoS2/NiCo2O4; Synergistic effect; Solar-to-hydrogen conversion
资金
- Fundamental Research Funds in Heilongjiang Provincial Universities [135109244, 135309115, 135309211, 135409104]
- Heilongjiang Science Foundation Project [JQ2019F003, ZD2019F004]
- City University of Hong Kong Strategic Research Grants (SRG) [7005105, 7005264]
The study presents a highly efficient non-precious metal catalyst MoS2/NiCo2O4/NF, which accelerates water dissociation under alkaline conditions and demonstrates superior stability.
Fabricating highly efficient and low-cost non-precious metal-based catalysts is a prerequisite for large-scale electrochemical water splitting in future renewable energy systems, yet remains a challenge. Herein, we describe the synthesis of cobalt-nickel oxide nanowires decorated with molybdenum disulfide nanosheets, directly grown on Ni foam (MoS2/NiCo2O4/NF), by a simple stepwise hydrothermal method and calcination process. Benefiting from a synergistic effect between MoS2 and NiCo2O4, the heterostructured catalyst accelerates water dissociation and exhibits superior catalytic activity under alkaline conditions, with a current density of 50 mA cm(-2) at a low overpotential of 322 mV for the oxygen evolution reaction (OER) and an overpotential of 106 mV for the hydrogen evolution reaction (HER) (@ j = 10 mA cm(-2)). Notably, when used as both anode and cathode for overall water splitting, MoS2/NiCo2O4/NF achieved a quite low voltage of 1.62 V at 10 mA cm(-2), and exhibited satisfactory stability for 16 h. Moreover, we have achieved continuous hydrogen and oxygen evolution at 1.606 V generated by using a solar panel, which is a promising route for solar-to-hydrogen conversion.
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