Journal
RSC ADVANCES
Volume 2, Issue 5, Pages 1835-1841Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ra00771h
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Funding
- China Postdoctoral Science Foundation [20100481401]
- Zhejiang Province Education Deparment [Y201119640]
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We report a single-crystalline Co3O4 nanowire array grown on a nickel foam prepared by a hydrothermal synthesis method for supercapacitor application. The Co3O4 nanowires show sharp tips and have an average diameter of 70 nm, and a length up to 25 mu m. Impressively, the as-prepared single-crystalline Co3O4 nanowire array exhibits noticeable pseudocapacitive performance with a high capacitance of 754 F g(-1) at 2 A g(-1) and 610 F g(-1) at 40 A g(-1) as well as excellent cycling stability. The enhanced supercapacitor performance is due to the unique one-dimensional (1D) architecture, which provides fast diffusion paths for ions and facilitates the electron and ion transfer on the Co3O4/electrolyte interfaces. Moreover, the 1D nanowire array can accommodate the volume expansion and restrain the pulverization and deterioration of Co3O4 during the repeated cycling process, resulting in enhanced cycling stability.
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