Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7733411 | Journal of Power Sources | 2015 | 8 Pages |
Abstract
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 kgâ1 at a power density of 750 W kgâ1. The energy density of the asymmetric supercapacitor is significantly improved in comparison with those of the symmetric supercapacitors based on CA (6.28 Wh kgâ1) and Co3O4-NF (2.42 Wh kgâ1). The asymmetric supercapacitor can also deliver a high energy density of 10.44 Wh kgâ1, even at a high power density of 7.5 kW kgâ1. In addition, the asymmetric device shows good stability with approximately 85% of its initial capacitance after 1000 cycles.
Related Topics
Physical Sciences and Engineering
Chemistry
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Authors
Weiwei Liu, Xin Li, Menghua Zhu, Xiong He,