Journal
JOURNAL OF POWER SOURCES
Volume 282, Issue -, Pages 179-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.047
Keywords
Co3O4 nanowires; Carbon aerogel; All-solid state; Asymmetric supercapacitor; Energy storage
Funding
- National Science Foundation of China [21176052]
- Specialized Research Fund for the Doctoral Program of Higher Education [20122302110043]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2013TS05]
- Program for Innovation Research of Science in Harbin Institute of Technology
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An all-solid state asymmetric supercapacitor has been fabricated using carbon aerogel (CA) microspheres as the negative electrode and CO3O4 nanowires on nickel foam (Co3O4-NF) as the positive electrode separated by PVA-KOH membrane as the electrolyte. For the desirable porous structure, high specific capacitance and rate capability of CA and Co3O4-NF, broader potential window of the two electrodes, no binder and conductive agent added, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0-1.5 V with an energy density of 17.9 Wh kg(-1) at a power density of 750 W The energy density of the asymmetric supercapacitor is significantly improved in comparison with those of the symmetric supercapacitors based on CA (6.28 Wh kg(-1)) and Co3O4 NF (2.42 Wh kg(-1)). The asymmetric supercapacitor can also deliver a high energy density of 10.44 Wh kg(-1), even at a high power density of 7.5 kW kg(-1). In addition, the asymmetric device shows good stability with approximately 85% of its initial capacitance after 1000 cycles. (C) 2015 Elsevier B.V. All rights reserved.
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