One-step synthesis of NiCo2S4 with high electrochemical performance used for hybrid capacitor
Journal of Alloys and Compounds(2020)
Abstract
Abstract Spinel sulfide NiCo2S4 (NCS) is one of the ternary metal sulfides, used as a promising electrode for hybrid capacitor, which is beneficial from its multi-active sites and good conductivity. In this study, NCS with sulfur vacancies was obtained through a one-step hydrothermal reaction. The morphology of NCS was regulated by adding a certain content of urea. Additionally, flower-like NCS was obtained when 10 mmol of urea was added, whose highest specific capacity performance was 453.40 C g−1 at 1 A g−1. Meanwhile, the as-prepared NCS electrode and activated carbon electrode were fabricated into hybrid capacitors. The energy density of such a device reached the highest value of 27.77 Wh kg−1, whereas the maximum power density was 13.34 kW kg−1. Moreover, this hybrid capacitor maintained the 62.07% of its initial capacity after 10 000 cycles at 2 A g−1, indicating that this one-step synthesized NCS has potential to be applied to long-serving energy storage device.
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Key words
Hydrothermal reaction,Ternary metal sulfide,Anode material,Hybrid capacitor
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