Issue 5, 2012

Freestanding Co3O4nanowire array for high performance supercapacitors

Abstract

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 μm. 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.

Graphical abstract: Freestanding Co3O4 nanowire array for high performance supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
22 Sep 2011
Accepted
18 Nov 2011
First published
04 Jan 2012

RSC Adv., 2012,2, 1835-1841

Freestanding Co3O4 nanowire array for high performance supercapacitors

X. Xia, J. Tu, Y. Zhang, Y. Mai, X. Wang, C. Gu and X. Zhao, RSC Adv., 2012, 2, 1835 DOI: 10.1039/C1RA00771H

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