期刊
SOLID STATE SCIENCES
卷 13, 期 11, 页码 2000-2006出版社
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2011.08.031
关键词
Ordered mesoporous carbon; Capacitance; Ionic liquid; Surface chemical property; Electrochemical impedance spectroscopy
资金
- Outstanding Young Scientist Foundation of Shandong Province [2008BS09007, BS2009NJ014]
- Key Sci-Tech Development Project of Shandong Province [2009GG10007006]
- Education Department of China [210125]
Ordered mesoporous carbons with tunable pore size and surface chemical properties are prepared by doping boric acid using a hard-templating method. The capacitive performance of these carbons is investigated in two common ionic liquids of EMImBE(4) and EMImTSFI. As demonstrated by the structure analysis, the pore size increases from 3.3 to 5.7 nm and the content of oxygenated groups on the carbon surface increases from 2.0 to 5.2 mol% with the increase of the boron doping from 0 to 50 mol%. In ionic liquid electrolyte, the carbons mainly show typical electric double layer capacitance, and the capacitance retention ratio and ion diffusion in the carbon channels is determined to the surface chemical property. The prepared carbons present visible pseudo-capacitance due to the rapid redox reactions of the oxygenated groups in hydrophilic EMImBF(4), reflecting by the increasing of the specific surface capacitance, while no visible pseudo-capacitive behavior was observed in hydrophobic EMImTSFI. (C) 2011 Elsevier Masson SAS. All rights reserved.
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