期刊
DALTON TRANSACTIONS
卷 48, 期 12, 页码 3853-3861出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04045a
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资金
- National Research Foundation (NRF) of Republic of Korea - Ministry of Education of Korea [NRF-2014R1A6A1031189, NRF-2015R1D1A1A09060292]
- National Research Foundation (NRF) of Republic of Korea under International Cooperation Program [NRF-2015K2A2A7053101]
Supercapacitors are one of the most promising renewable-energy storage systems. In this study, a three-dimensional walking palm-like core-shell CoMoO4@NiCo2S4@nickel foam (NF) nanostructure was synthesized using a two-step hydrothermal method for high electrochemical performance. The as-prepared composite exhibited a high areal capacitance of 17.0 F cm(-2) (2433 F g(-1)) at a current density of 5 mA cm-2 in a three-electrode system. The results revealed outstanding cycling stability of 114% after 10 000 charge-discharge cycles. An aqueous asymmetric supercapacitor device assembled with CoMoO4@NiCo2S4@NF and activated carbon (AC)@ NF as the positive and negative electrodes, respectively, showed a high capacitance of 4.19 F cm(-2) (182 F g(-1)) and delivered a high energy density of 60.2 W h kg(-1) at a power density of 188 W kg(-1) and a high power density of 1.5 kW kg-1 at an energy density 29.2 W h kg(-1), lighting 22 parallel-connected red light emitting diodes for over 60 s. The synergistic effects of the core-shell CoMoO4@NiCo2S4@NF electrode material highlight the potential of this composite as an effective active material for supercapacitor applications.
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