期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 46, 页码 23283-23288出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta06658a
关键词
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资金
- Ministry of Education (Singapore) [MOE2012-T2-2-102]
- MOE under AcRF Tier 2 [ARC 26/13, MOE2013-T2-1-034, ARC 19/15, MOE2014-T2-2-093]
- MOE under AcRF Tier 1 [RGT18/13, RG5/13]
- NTU under Start-Up Grant [M4081296.070.500000]
- NTU under iFood Research Grant [M4081458.070.5000000]
- Singapore Millennium Foundation in Singapore
- Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Programme
- National Research Foundation, Prime Minister's Office, Singapore
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.
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