Journal
APPLIED SURFACE SCIENCE
Volume 532, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147438
Keywords
CoO@CoS/Ni3S2; Hierarchical nanostructure; Specific capacitance; Energy density
Categories
Funding
- National Natural Science Foundation of China [51902126, 61605059, 61705079]
- Program for the Development of Science and Technology of Jilin Province [20180414008GH, 20190701021GH, 20180520182JH]
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CoO@CoS/Ni3S2 (CoO@Ni-Co-S) hierarchical nanostructure electrode materials are synthesized on nickel foam (NF) through hydrothermal process and electrodeposition. The three dimensional porous CoO@Ni-Co-S hierarchical nanostructure is formed through the interconnection between the CoO nanoneedles and the Ni-Co-S nanosheets. This structure is beneficial for the transport of electrolyte ions and electrons. The CoO@Ni-Co-S nanocomposite exhibits a specific capacitance of 2507 F g(-1) at 1 A g(-1) (which is superior to CoO@CoS electrode, 1855 F g(-1) at 1 A g(-1)) and possesses a capacitance retention of 84.2% at 10 A g(-1). Furthermore, an asymmetric supercapacitor with CoO@Ni-Co-S//activated carbon is assembled, and the energy density reaches 110.7 W h kg(-1) when the power density is 880 W kg(-1). The asymmetric supercapacitor also exhibits an excellent cyclic stability (84.3% capacitance retention over 10,000 cycles). Preliminary results demonstrate that CoO@Ni-Co-S is a promising material for energy storage.
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