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

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 na...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-01, Vol.3 (46), p.23283-23288
Main Authors: Guan, Cao, Wang, Yadong, Hu, Yating, Liu, Jilei, Ho, Kuan Hung, Zhao, Wei, Fan, Zhanxi, Shen, Zexiang, Zhang, Hua, Wang, John
Format: Article
Language:English
Subjects:
Asymmetry
Carbon
Cycles
Electrodes
Energy density
Metal oxides
Nanostructure
Supercapacitors
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Summary: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[at]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[at]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.
ISSN:2050-7488
2050-7496
DOI:10.1039/c5ta06658a