Journal
APPLIED SURFACE SCIENCE
Volume 505, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144618
Keywords
Cobalt selenide nanosheets; Microwave-assisted method; Hybrid supercapacitor; Energy density
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Funding
- National Natural Science Foundation of China [21371023]
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Metal selenides, particularly transition metal selenides, are the superb potential electrode materials for electrochemical energy storage applications. Herein, the cobalt selenide (Co0.85Se) nanosheets are successfully synthesized by a rapid, simplistic, and economical technique via the microwave-assisted method. It is found that Co0.85Se achieves the large specific surface area (104 m(2) g(-1)), and delivers a higher specific capacitance (1580 F g(-1) at 1 A g(-1) and 500 F g(-1) at 20 A g(-1)) as a positive electrode for hybrid supercapacitor. Further, a full-cell hybrid supercapacitor is assembled by using Co0.85Se as an anode and activated carbon as the cathode, which shows excellent energy density 51.2 W h kg(-1) at power density 800 W kg(-1), and maintains 28.4 W h kg(-1) when power density increases to 12,800 W kg(-1). Moreover, the full-cell device shows remarkable stability of 10,000 cycles, having a wider operating potential window ranging from 0 to 1.6 V. Such excellent performance of Co0.85Se exhibits that it is a favorable material for the energy storage applications.
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