期刊
CHEMICAL ENGINEERING JOURNAL
卷 368, 期 -, 页码 513-524出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.138
关键词
NiCo2S4/Co9S8; Hollow spheres; Sacrificial template; Asymmetric supercapacitors
资金
- National Natural Science Foundation of China [21001004]
- Natural Science Foundation of the Anhui Higher Education Institutions [KJ2016A277]
- Innovation Funds of Anhui Normal University [2018XJJ109]
- Anhui Normal University [2018XJJ62]
- Key Laboratory of Functional Molecular Solids, Ministry of Education
- Anhui Laboratory of Molecule-Based Materials [16005]
Nickel cobalt sulfides have been widely used as the battery-type electrode materials for asymmetric supercapacitors. However, it is still a challenge that obtains a unique structure to improve their electrochemical characteristics and practical applications. Hollow porous structures with hetero-interfaces are currently promising to endow electroactive materials with excellent properties, such as well-defined interior voids, low density, high pore volume, and surface permeability. Herein, hetero-structure NiCo2S4/Co9S8 hollow spheres were synthesized by using the carbon spheres as the sacrificial template via the solvothermal method and anion exchange process. When evaluated as a promising electrode for supercapacitors, the NiCo2S4/Co9S8 electrode exhibited an excellent specific capacitance of 2180 F g(-1) at the current density of 1 A g(-1), a high capacity retention that the specific capacitance retained 1400 F g(-1) even at 20 A g(-1), and a long stable cycling performance of retaining similar to 85% after 10,000 cycles. In addition, the asymmetric supercapacitors based on these hollow hetero-spheres exhibited a high energy density of 96.5 Wh kg(-1) at a power density of 0.8 kW kg(-1). The energy density can achieve 51.7 Wh kg(-1) even at a higher power density of 20 kW kg(-1), indicating that the NiCo2S4/Co9S8 hollow spheres have superior practical applications for energy storage.
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