期刊
ELECTROCHIMICA ACTA
卷 231, 期 -, 页码 403-411出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.01.194
关键词
Nitrogen-doped porous carbons; Longan shell; High surfacearea; CO2 capture; Supercapacitor
资金
- Shanghai Leading Academic Discipline Project [J51503]
- National Natural Science Foundation of China [20976105, 51641208, 21606151]
- Shanghai excellent technical leaders [17XD1424900]
- Shanghai Association for Science and Technology Achievements Transformation Alliance Program [LM201559]
- Shanghai Municipal Education Commission boosting project [15cxy39]
- Science and Technology Commission of Shanghai Municipality Project [14520503200]
- Shanghai Municipal Education Commission (Plateau Discipline Construction Program)
- Shanghai Talent Development Funding [201335]
- laboratory technique project-Chemical engineering simulation training cente [3921NH163004007]
We present a low-cost approach for facile synthesis of nitrogen-doped porous carbons by utilising waste longan shell as carbon source and carbamide as additional nitrogen source through KOH activation at 600 degrees C-900 degrees C for 2 hours under N-2 atmosphere. The obtained porous carbons possess highly-developed ultra-micropores (approximately 0.6 nm), an ultrahigh specific surface area (up to 3260 m(2) g(-1)) and a nitrogen content of 2.3 at.%. The porous carbon exhibits excellent electrochemical properties (a high specific capacity up to 322 F g(-1) and an energy density of up to 20.4 W h kg(-1)) at a current density of 0.5 A g(-1) in 6 M KOH and an excellent cycle stability (retained almost 96.2% specific capacitance after 5000 cycles). In addition, the porous carbon shows high CO2 adsorption capacities of 5.6 mmol g(-1) (at 0 degrees C) and 4.3 mmol g(-1) (at 25 degrees C) and high CO2 selectivity against N-2. These results indicate that the fabricated porous carbon is a promising electrode material for supercapacitors and a solid adsorbent for CO2 uptake. (C) 2017 Elsevier Ltd. All rights reserved.
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