Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 10, Pages 7626-7632Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5009369
Keywords
needle-like Co3O4; graphene; aqueous supercapacitor; electrochemical performance; needle-like CoO; urchin-like spheres
Funding
- Startup Foundation of China Academy of Engineering Physics, Institute of Chemical Materials [KJCX201301, KJCX201306]
- National High-tech Research and Development Program (863 Program) [2013AA050905]
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We synthesized the needle-like cobalt oxide/graphene composites with different mass ratios, which are composed of cobalt oxide (Co3O4 or CoO) needle homogeneously anchored on graphene nanosheets as the template, by a facile hydrothermal method. Without the graphene as the template, the cobalt precursor tends to group into urchin-like spheres formed by many fine needles. When used as electrode materials of aqueous supercapacitor, the composites of the needle-like Co3O4/graphene (the mass ratio of graphene oxide(GO) and Co(NO3)(2)center dot 6H(2)O is 1:5) exhibit a high specific capacitance of 157.7 F g(-1) at a current density of 0.1 A g(-1) in 2 mol L-1 KOH aqueous solution as well as good rate capability. Meanwhile, the capacitance retention keeps about 70% of the initial value after 4000 cycles at a current density of 0.2 A g(-1). The enhancement of excellent electrochemical performances may be attributed to the synergistic effect of graphene and cobalt oxide components in the unique multiscale structure of the composites.
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