Open Access Nano Express

Hierarchical mesoporous nickel cobaltite nanoneedle/carbon cloth arrays as superior flexible electrodes for supercapacitors

Deyang Zhang12, Hailong Yan12, Yang Lu123, Kangwen Qiu12, Chunlei Wang12, Chengchun Tang3, Yihe Zhang4, Chuanwei Cheng5 and Yongsong Luo126*

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 School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, People's Republic of China

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

5 Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China

6 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore

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Nanoscale Research Letters 2014, 9:139  doi:10.1186/1556-276X-9-139

Published: 24 March 2014

Abstract

Hierarchical mesoporous NiCo2O4 nanoneedle arrays on carbon cloth have been fabricated by a simple hydrothermal approach combined with a post-annealing treatment. Such unique array nanoarchitectures exhibit remarkable electrochemical performance with high capacitance and desirable cycle life at high rates. When evaluated as an electrode material for supercapacitors, the NiCo2O4 nanoneedle arrays supported on carbon cloth was able to deliver high specific capacitance of 660 F g-1 at current densities of 2 A g-1 in 2 M KOH aqueous solution. In addition, the composite electrode shows excellent mechanical behavior and long-term cyclic stability (91.8% capacitance retention after 3,000 cycles). The fabrication method presented here is facile, cost-effective, and scalable, which may open a new pathway for real device applications.

Keywords:
Flexible; Supercapacitors; Nickel cobaltite; Nanoneedle; Carbon cloth