Journal
CHEMISTRYSELECT
Volume 1, Issue 7, Pages 1441-1446Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201600133
Keywords
Supercapacitors; carbon nanosheet; nitrogen doping; hierarchical pores; grapefruit peels
Categories
Funding
- Science Technology Program of Jilin Province [20140101087JC, 20150520027JH]
- International Postdoctoral Exchange Fellowship Program
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In this work, the low-cost hierarchically porous nitrogen-doped carbon nanosheets (PNCNs) were prepared via one-step carbonization and KOH activation process of grapefruit peels. The prepared PNCNs exhibit higher specific surface area due to the inducement of the KOH-assisted carbonization compared to directly carbonized grapefruit peels (DCGPs). The PNCNs exhibit excellent electrochemical performances with high specific capacitance up to 311 Fg (-1), superior cycling stability over 10000 cycles with only 5.95% capacitance degradation, high energy density of 17.7 W h kg (-1) and power density of 1100 W kg (-1) in 1 mol L (-1) H2SO4 electrolyte. All these electrochemical data are significantly better than the comparative DCGPs material. Moreover, the assembled symmetric supercapacitor in 1 mol L (-1) Na2SO4 aqueous electrolyte exhibits a high energy density of 34.05 W h kg (-1) at a power density of 180 W kg (-1) and retains 14.25 W h kg(-1) even at 5400 W kg(-1)
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