Dodecyl sulfate-induced fast faradic process in nickel cobalt oxide–reduced graphite oxide composite material and its application for asymmetric supercapacitor device

In this contribution, we report a facile preparation method of nickel cobalt oxide-reduced graphite oxide (NiCo sub(2)O sub(4)-rGO) composite material. A fast Faradic process has been realized by sodium dodecyl sulfate (SDS)-induced ultrasmall NiCo sub(2)O sub(4) nanocrystals on rGO. As a result, th...

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Published inJournal of materials chemistry Vol. 22; no. 43; pp. 23114 - 23119
Main Authors Wang, Xu, Liu, Wan Shuang, Lu, Xuehong, Lee, Pooi See
Format Journal Article
LanguageEnglish
Published 01.01.2012
Subjects
Asymmetry
Capacitors
Cobalt
Composite materials
Density
Devices
Graphite
Nickel
Oxides
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Summary:In this contribution, we report a facile preparation method of nickel cobalt oxide-reduced graphite oxide (NiCo sub(2)O sub(4)-rGO) composite material. A fast Faradic process has been realized by sodium dodecyl sulfate (SDS)-induced ultrasmall NiCo sub(2)O sub(4) nanocrystals on rGO. As a result, this composite material gives a high specific capacitance of 1222 F g super(-1) at 0.5 A g super(-1) and 768 F g super(-1) at 40 A g super(-1), showing an outstanding rate capability. An asymmetric supercapacitor device with high energy and power densities has been successfully assembled based on NiCo sub(2)O sub(4)-rGO composite material and activated carbon. The optimized device shows a high energy density of 23.32 Wh kg super(-1) at a power density of 324.9 W kg super(-1). In addition, this asymmetric device shows good stability towards multistage current charge-discharge cycles.
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ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm35307e