Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149194 | Journal of Power Sources | 2017 | 9 Pages |
Abstract
Vastly improving the charge storage capability of supercapacitors without sacrificing their high power density and cycle performance would bring bright application prospect. Herein, we report a nitrogen and sulfur co-doped hierarchical porous carbon (NSHPC) with very superior capacitance performance fabricated by KOH activation of nitrogen and sulfur co-doped ordered mesoporous carbon (NSOMC). A high electrochemical double-layer (EDL) capacitance of 351Â FÂ gâ1 was observed for the reported NSHPC electrodes, and the capacitance remains at 288Â FÂ gâ1 even under a large current density of 20Â AÂ gâ1. Besides the high specific capacitance and outstanding rate capability, symmetrical supercapacitor cell based on the NSHPC electrodes also exhibits an excellent cycling performance with 95.61% capacitance retention after 5000 times charge/discharge cycles. The large surface area caused by KOH activation (2056Â m2Â gâ1) and high utilized surface area owing to the ideal micro/mesopores ratio (2.88), large micropores diameter (1.38Â nm) and short opened micropores structure as well as the enhanced surface wettability induced by N and S heteroatoms doping and improved conductivity induced by KOH activation was found to be responsible for the very superior capacitance performance.
Related Topics
Physical Sciences and Engineering
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Electrochemistry
Authors
Deyi Zhang, Mei Han, Bing Wang, Yubing Li, Longyan Lei, Kunjie Wang, Yi Wang, Liang Zhang, Huixia Feng,