Rattle-type NiCo 2 O 4 –carbon composite microspheres as electrode materials for high-performance supercapacitors

In this work, NiCo 2 O 4 –carbon composite microspheres with rattle-type structure were successfully prepared by a template-engaged hydrothermal and subsequent calcination treatment. These rattle-type microspheres are composed of a solid carbon core and a porous shell with nanorods as building block...

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Veröffentlicht in:New journal of chemistry 2015, Vol.39 (9), p.7495-7502
Hauptverfasser: Ma, Yongchao, Jiang, Haiyan, Liu, Qingzhi, Kang, Wukui, Shi, Jinsheng
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container_issue 9
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container_title New journal of chemistry
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creator Ma, Yongchao
Jiang, Haiyan
Liu, Qingzhi
Kang, Wukui
Shi, Jinsheng
description In this work, NiCo 2 O 4 –carbon composite microspheres with rattle-type structure were successfully prepared by a template-engaged hydrothermal and subsequent calcination treatment. These rattle-type microspheres are composed of a solid carbon core and a porous shell with nanorods as building blocks. The calcination temperature of the NiCo 2 O 4 –carbon precursor has an obvious effect on the morphology as well as the resultant capacitive performances. Because of their unique structure and high specific surface area, these rattle-type NiCo 2 O 4 –carbon composite microspheres exhibited excellent electrochemical performances with high specific capacitance (790 F g −1 at 1 A g −1 ), and it even reached as high as 609 F g −1 at 10 A g −1 . Additionally, excellent cycling stability with 99.4% specific capacitance retention after continuous 2000 cycles at a current density of 2 A g −1 was observed, suggesting their promising application in supercapacitors. The synergistic effect of different components and the rattle-type structure may contribute to the outstanding performance of the composite electrode.
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title Rattle-type NiCo 2 O 4 –carbon composite microspheres as electrode materials for high-performance supercapacitors
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