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Open Access Nano Express

Solution growth of NiO nanosheets supported on Ni foam as high-performance electrodes for supercapacitors

Hailong Yan, Deyang Zhang, Jinyou Xu, Yang Lu, Yunxin Liu, Kangwen Qiu, Yihe Zhang and Yongsong Luo

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Nanoscale Research Letters 2014, 9:424  doi:10.1186/1556-276X-9-424

Published: 22 August 2014

Abstract (provisional)

Well-aligned nickel oxide (NiO) nanosheets with the thickness of a few nanometers supported on a flexible substrate (Ni foam) have been fabricated by a hydrothermal approach together with a post-annealing treatment. The three-dimensional NiO nanosheets were further used as electrode materials to fabricate supercapacitors, with high specific capacitance of 943.5, 791.2, 613.5, 480, and 457.5 F g-1 at current densities of 5, 10, 15, 20, and 25 A g-1, respectively. The NiO nanosheets combined well with the substrate. When the electrode material was bended, it can still retain 91.1% of the initial capacitance after 1,200 charging/discharging cycles. Compared with Co3O4 and NiO nanostructures, the specific capacitance of NiO nanosheets is much better. These characteristics suggest that NiO nanosheet electrodes are promising for energy storage application with high power demands.

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