Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 29, Issue 9, Pages 7707-7717Publisher
SPRINGER
DOI: 10.1007/s10854-018-8766-0
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Funding
- China Government 1000 Plan Talent Program
- China MOE NCET Program
- Natural Science Foundation of China [51322204]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120111120009]
- Fundamental Research Funds for the Central Universities [WK2060140014, WK2060140017, 2013HGXJ0199, J2014HGXJ0092]
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The plant waste pomelo peels are used as carbon precursors to fabricate nitrogen-doped hierarchical porous carbon. The sample PC600 is fabricated at mild calcination temperature of 600 A degrees C, which has nitrogen content of as high as 4.47% and hierarchical pores with a BET surface area of 1104 m(2) g(-1). The symmetric supercapacitor based on PC600//PC600 electrodes exhibits excellent electrochemical performance benefiting from both the electric double-layer capacitance and pseudocapacitance of PC600. In 1 M H2SO4 electrolyte, this supercapacitor delivers gravimetric capacitance of 208.7 F g(-1), volumetric capacitance of 219.3 F cm(-3), and energy density of 7.3 Wh kg(-1) at a current density of 1 A g(-1). Furthermore, the extraordinary energy density of 21.6 Wh kg(-1) at 1 A g(-1) and 17.1 Wh kg(-1) at 20 A g(-1) are obtained in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) electrolyte. The suitable calcination process can make the contents of nitrogen atoms and pores structures in PC600 to achieve an optimal combination, leading to improved electrochemical performance.
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