Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 25, Pages 9319-9325Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10946d
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Funding
- China Postdoctoral Science Foundation [20100481401]
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We report a facile hydrothermal synthesis method for the large-area growth of self-supported hollow Co3O4 nanowire arrays. The Co3O4 nanowires have an average diameter of 200 nm and grow vertically to the substrates forming aligned nanowire arrays. Interestingly, the as-prepared Co3O4 nanowire arrays combine properties of hollow structure and quasi-single crystallinity. A plausible formation mechanism of hollow Co3O4 nanowire arrays is proposed here. The Co3O4 nanowire arrays grown on the nickel foam are tested as a cathode electrode material for supercapacitor by cyclic voltammograms (CVs) and galvanostatic charge-discharge tests in 1 M KOH. The self-supported hollow Co3O4 nanowire arrays exhibit superior supercapacitor performances with high specific capacitances (599 F g(-1) at 2 A g(-1) and 439 F g(-1) at 40 A g(-1)) as well as excellent cycle life, making them suitable for high-rate supercapacitor application. The enhanced supercapacitor performances are due to its unique porous structure providing fast ion and electron transfer, large reaction surface area and good strain accommodation.
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