期刊
ENERGY STORAGE MATERIALS
卷 24, 期 -, 页码 486-494出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.07.009
关键词
Porous carbon; Ultrahigh surface area; C-N etching; KOH activation; Supercapacitors
资金
- National Natural Science Foundation of China [51673117, 21805193, 51574166, 51602199]
- Science and Technology Innovation Commission of Shenzhen [JSGG20160226201833790, JCYJ20170818093832350, JCYJ2017 0818112409808, JSGG20170824112840518, JCYJ201805071847 11069, JCYJ20170818100112531, JCYJ20170818101016362, JCYJ20 170817094628397, JCYJ20180305125319991]
- Key R&D Programme of Guangdong Province [2019B010929002, 2019B010941001]
In consideration of the C-N bond is significantly weaker than C-C bond by about 30 kcal/mol, a selective etching of C-N bonds strategy has been put forward to prepare porous carbons with high specific surface area. The strategy has been characterized by a combination of experimental and theoretical techniques. The key to this success includes two-folds: the uniformly distributed C-N bonds and their preferential etching over the vast C-C bonds in the carbon precursors. Consequently, polydopamine with high nitrogen content is chosen as the precursor, through in situ C-N bond etching with KOH, a hierarchical porous carbon with an ultrahigh specific surface area of 3965m(2)/g has been prepared, and the total pore volume is as high as 4.02 cm(3)/g. Specifically, the porous carbon showed a high specific capacitance of 342 F/g at 1 A/g and retained 268 F/g even at 10 A/g in 6M KOH. Meanwhile, the symmetric supercapacitor devices deliver energy density of 29.2 Wh/kg at 347.5 W/kg and 20.7 Wh/kg at 10.3 kW/kg in 1M Li2SO4 aqueous electrolyte. Impressively, in organic electrolyte, it retains a high energy density of 80.8 Wh/kg even at 26.9 kW/kg.
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