High-performance all-solid-state asymmetric supercapacitors based on sponge-like NiS/Ni3S2 hybrid nanosheets. (March 2019)

• Record Type: Journal Article
• Authors: Chen, Fangshuai; Wang, Hui; Ji, Shan; Linkov, Vladimir; Wang, Rongfang
• Is Part Of: Materials today energy. Volume 11(2019)
• Page Start: 211
• Page End: 217
• Publication Date: 2019-03
• Subjects: Nickel sulfides -- Binder-free electrode -- Nanosheet -- Asymmetric supercapacitors -- Energy storage; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2018.12.002
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: NiS/Ni3 S2 hybrid nanosheets with good crystallinity as binder-free cathodes for asymmetric supercapacitors were fabricated via a low-cost single step solvothermal method. Physical characteristics of the obtained NiS/Ni3 S2 hybrids reveal open and sponge-like structure consisting of interconnected thin sheets. During electrochemical study in a three-electrode cell NiS/Ni3 S2 exhibited a high capacity of 315 μAh cm −2 at a current density of 1 mA cm −2 and retained 87.6% of the capacity when the current density increased 10 folds. A two electrode asymmetric supercapacitor containing NiS/Ni3 S2 as a cathode and activated carbon as an anode demonstrated a high energy density of 0.289 m Wh cm −2 at a power density of 1.794 mW cm −2, which remained at 0.242 mWh cm −2 when the power density increased to 12.825 mW cm −2 . New electrode material developed in this study has good potential for practical applications in asymmetric supercapacitors. Graphical abstract: Image 1 Highlights: NiS/Ni3 S2 hybrid nanosheets grown on Ni foam is synthesized via a facile process. NiS/Ni3 S2 hybrid can be controllably synthesized via adjusting the amount of sulfur. NiS/Ni3 S2 exhibits high specific capacity, superior rate capability and stability.