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Electrode material based on a novel core–shell structure consisting of NiCo_2S_4(NCS) solid fiber core and Mn S(MS) sheet shell(NCS@MS) in situ grown on carbon cloth(CC) has been successfully prepared by a simple sulfurization-assisted hydrothermal method for high performance supercapacitor. The synthesized NiCo_2S_4@Mn S/CC electrode shows high capacitance of 1908.3 F g~(-1) at a current density of 0.5 A g~(-1) which is higher than those of NiCo_2S_4 and Mn S at the same current density. A flexible all-solid-state asymmetric supercapacitor(ASC) is constructed by using NiCo_2S_4@Mn S/CC as positive electrode, active carbon/CC as negative electrode and KOH/poly(vinyl alcohol)(PVA) as electrolyte. The optimized ASC shows a maximum energy density of 23.3 Wh kg~(-1) at 1 A g~(-1), a maximum power density of about7.5 kw kg~(-1) at 10 A g~(-1) and remarkable cycling stability. After 9000 cycles, the ASC still exhibited67.8% retention rate and largely unchanged charge/discharge curves. The excellent electrochemical properties are resulted from the novel core–shell structure of the NiCo_2S_4@Mn S/CC electrode, which possesses both high surface area for Faraday redox reaction and superior kinetics of charge transport. The NiCo_2S_4@Mn S/CC electrode shows a promising potential for energy storage applications in the future.
Electrode material based on a novel core-shell structure consisting of NiCo_2S_4 (NCS) solid fiber core and Mn S (MS) sheet shell (NCS @ MS) in situ grown on carbon cloth (CC) has been successfully prepared by a simple sulfurization- The synthesized NiCo_2S_4 @ Mn S / CC electrode shows high capacitance of 1908.3 F g -1 (a) at a current density of 0.5 A g -1 which is higher than those of NiCo_2S_4 and Mn S at the same current density. A flexible all-solid-state asymmetric supercapacitor (ASC) is constructed by using NiCo_2S_4 @ Mn S / CC as positive electrode, active carbon / CC as negative electrode and KOH / poly PVA) as electrolyte. The optimized ASC shows a maximum energy density of 23.3 Wh kg -1 at 1 A g -1, a maximum power density of about 7.5 kw kg -1 at 10 A g ~ (-1) and remarkable cycling stability. After 9000 cycles, the ASC still showed67.8% retention rate and largely unchanged charge / discharge curves. The excellent electrochemical properties are resulted from the novel core-shell structure of the NiCo_2S_4 @ Mn S / CC electrode, which possesses both high surface area for Faraday redox reaction and superior kinetics of charge transport. The NiCo_2S_4 @ Mn S / CC electrode shows promising potential for energy storage applications in the future.