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Open Access Nano Express

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

Hailong Yan12, Deyang Zhang12, Jinyou Xu12, Yang Lu12, Yunxin Liu3, Kangwen Qiu12, Yihe Zhang4 and Yongsong Luo12*

  • * Corresponding author: Yongsong Luo eysluo@163.com

  • † Equal contributors

Author Affiliations

1 School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, People's Republic of China

2 Key Laboratory of Advanced Micro/Nano Functional Materials, Xinyang Normal University, Xinyang 464000, People's Republic of China

3 Department of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China

4 School of Materials Science and Technology, China University of Geosciences, Beijing 100083, People's Republic of China

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

Published: 22 August 2014

Abstract

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.

Keywords:
NiO nanosheets; Hydrothermal approach; Long cycle life; Flexible supercapacitors