Multidimensional structure of CoNi 2 S 4 materials: structural regulation promoted electrochemical performance in a supercapacitor

Multidimensional architectures of CoNi S electrode materials are rationally designed by engineering the surface structure toward that of high-performance supercapacitors. The fabrication of a special morphology is highly dependent on the synergistic effect between the guidance of Co-Ni precursor arr...

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Veröffentlicht in:RSC advances 2020-02, Vol.10 (13), p.7541-7550
Hauptverfasser: Han, Yue, Sun, Shishuai, Cui, Wen, Deng, Jiachun
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creator Han, Yue
Sun, Shishuai
Cui, Wen
Deng, Jiachun
description Multidimensional architectures of CoNi S electrode materials are rationally designed by engineering the surface structure toward that of high-performance supercapacitors. The fabrication of a special morphology is highly dependent on the synergistic effect between the guidance of Co-Ni precursor arrays and a subsequent sulfidation process. The unparalleled CoNi S electrode materials (NS-3) deliver a significantly enhanced specific capacitance (3784.6 F g at 3 A g ), accompanied by an extraordinary rate capability (2932.3 F g at 20 A g ) and excellent cycling life. The outstanding supercapacitor performance stated above stems from the advantages of a multidimensional structure generated by crosslinking 2D microsheets/1D nanowires/2D ultrathin nanosheets; this structure supplies additional efficient active sites and a large contact area at the electrode-electrolyte interface, providing faster transport kinetics for electrons and ions. For practical applications, asymmetric devices based on an NS-3 positive electrode and active carbon negative electrode exhibit a high energy density of 38.5 W h kg accompanied by a power density of 374.9 W kg (22 W h kg at 7615.4 W kg ). The above results indicate that the design of multidimensional Co-Ni-S materials is an effective strategy to achieve a high-performance supercapacitor.
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title Multidimensional structure of CoNi 2 S 4 materials: structural regulation promoted electrochemical performance in a supercapacitor
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