Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 13, Pages 4920-4928Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta09740a
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Funding
- National Natural Science Foundation of China [21403044, 51472077, 51572052]
- China Postdoctoral Science Foundation [2014M561332]
- Heilongjiang Postdoctoral Fund [LBH-Z13059]
- Major Project of Science and Technology of Heilongjiang Province [GA14A101]
- Fundamental Research Funds for the Central Universities [HEUCF20151004]
- Program for New Century Excellent Talents in University [NCET-13-0779]
- Project of Research
- Development of Applied Technology of Harbin [2014DB4AG016]
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Large surface area, high electrical conductivity, and abundant channels have been recognized to favor faradic capacitors, but their realization at the same time by a facile preparation process is still a great challenge. Here, we synthesized porous cadmium sulphide freely standing on nickel foam (CdS/NF) via a one-step hydrothermal method which possesses high specific capacitance, good rate capability and outstanding cycling stability. The CdS/NF microspheres present pores with a mean size of similar to 3 nm, resulting in fast diffusion of ions, facile transportation of electrons and high activity, which make great synergistic contributions to reversible redox reactions. In the resulting supercapacitors, a specific capacitance of 909 F g(-1) is achieved at a current density of 2 mA cm(-2) with excellent rate capability that 88% of the original capacitance is retained at 50 mA cm(-2). After 5000 charge-discharge cycles at current densities as large as 50 mA cm(-2), 104% of initial capacitance is maintained. Finally, asymmetric supercapacitors with a high energy density of 28 W h kg(-1) at a power density of 160 W kg(-1) were obtained.
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