Construction of core-shell cobalt sulfide/manganese molybdate nanostructure on reduced graphene oxide/Ni foam as an advanced electrode for high-performance asymmetric supercapacitor
The transition metal oxides with multiple oxidation states and large electrical conductivity have been extensively studied in energy storage capacitors. Herein, the core-shell cobalt sulfide/manganese molybdate composites grown on reduced graphene oxide/Ni foam (CoS/MMO/rGO/NF) have been successfull...
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Veröffentlicht in: | Electrochimica acta 2019-07, Vol.312, p.213-223 |
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Sprache: | eng |
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Zusammenfassung: | The transition metal oxides with multiple oxidation states and large electrical conductivity have been extensively studied in energy storage capacitors. Herein, the core-shell cobalt sulfide/manganese molybdate composites grown on reduced graphene oxide/Ni foam (CoS/MMO/rGO/NF) have been successfully prepared via hydrothermal and followed by electrodeposition methods. It is found that the deposition mass of CoS has a significant effect on the morphologies and electrochemical properties of CoS/MMO/rGO/NF electrodes. When the mass of CoS is 0.4 mg cm−2 (CoS-0.4/MMO/rGO/NF), the composite yields a remarkable specific capacitance of 3074.5 F g−1 (1 A g−1) and a good cycling performance of 87% through 5000 cycles. Moreover, an asymmetric device based on the CoS-0.4/MMO/rGO/NF composite shows a maximum energy density (50.3 W h kg−1 at 415.8 W kg−1) and a good long-term stability (retention 96% even after 8000 cycles). These characteristics of CoS-0.4/MMO/rGO/NF are mainly attributed to the high conductivity of reduced graphene oxide and the synergistic effects of MnMoO4 and CoS, as well as its unique morphology. These superior properties of CoS-0.4/MMO/rGO/NF demonstrate its potential application as electrode material in energy storage capacitors.
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•A core-shell CoS-0.4/MMO/rGO/NF composite is prepared via hydrothermal and electrodeposition methods.•The influences of different mass loading of CoS on morphology and electrochemical performances are investigated.•Interconnected CoS-0.4/MMO/rGO/NF composite exhibits a highly improved specific capacitance of 3074.5 F g−1.•Asymmetric supercapacitor device delivers an excellent energy density and a high cycling stability. |
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ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/j.electacta.2019.05.008 |