Issue 46, 2015

Conformally deposited NiO on a hierarchical carbon support for high-power and durable asymmetric supercapacitors

Abstract

Metal oxide based supercapacitors can provide much higher energy densities as compared with carbon-based ones. However, metal oxides usually suffer from low power densities together with poor cycle life, which is a big barrier for their practical applications. In this work, purposely confined NiO nanoparticles have been deposited uniformly on a three-dimensional graphite foam–carbon nanotube forest substrate, giving rise to a well-integrated free-standing electrode (GF–CNT@NiO) with strong synergetic effects generated from nickel oxide and the carbon support. The electrode with 57.6% mass content of NiO delivers a high specific capacity of 196.5 mA h g−1 and excellent cycling stability for 30 000 cycles. By coupling with a graphene–CNT paper anode, an asymmetric supercapacitor (GF–CNT@NiO//G–CNT) is assembled, which demonstrates excellent cycling ability (only 18.3% of capacitance drop after 30 000 cycles) and high power density (1.06–7.14 kW kg−1), suggesting its great promise for advanced supercapacitors.

Graphical abstract: Conformally deposited NiO on a hierarchical carbon support for high-power and durable asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
24 Aug 2015
Accepted
08 Oct 2015
First published
08 Oct 2015

J. Mater. Chem. A, 2015,3, 23283-23288

Author version available

Conformally deposited NiO on a hierarchical carbon support for high-power and durable asymmetric supercapacitors

C. Guan, Y. Wang, Y. Hu, J. Liu, K. H. Ho, W. Zhao, Z. Fan, Z. Shen, H. Zhang and J. Wang, J. Mater. Chem. A, 2015, 3, 23283 DOI: 10.1039/C5TA06658A

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