Rapid and simplistic microwave assisted method to synthesise cobalt selenide nanosheets; a prospective material for high performance hybrid supercapacitor

• DOI: 10.1016/j.apsusc.2019.144618
• Publication Date: 2019-11-19T16:32:46Z
• Authors: Waqar Younas; Muhammad Naveed; Chuanbao Cao; Syed Khalid; Souleymen Rafai; Zhitao Wang; Yujun Wu; Lifen Yang
• Keywords: Power density; Selenide

Abstract 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 m2 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.