期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 73, 期 3, 页码 385-390出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2011.10.028
关键词
Microporous materials; Differential scanning calorimetry (DSC); Raman spectroscopy; Electrochemical properties
资金
- National Natural Science Foundation of China [50872032]
- Fundamental Research Funds for the Central Universities [531107040185]
In the absence of activation process, we prepared a series of carbon particles from saccharine, in which hydrothermal carbonization method was used. These particles have spherical or near-spherical morphology, controllable monodisperse particle size from the analyses of SEM. Raman and XRD results show that they are nongraphitizable. The BET surface area of these carbon spherules is around 400-500 m(2) g(-1) and the microporosity is about 84%, suggesting that the carbon particles are rich in micropores. The electrochemical behaviors were characterized by means of galvanostatic charging/discharging, cycle voltammetry and impedance spectroscopy. The results show that the specific capacitance of sucrose-based carbon spherule reached 164 F g(-1) in 30% KOH electrolyte and a high volumetric capacitance over 170 F cm(-3) was obtained. These carbon spherules could be promising materials for EDLC according to their facile preparation way, low cost and high packing density. (C) 2011 Elsevier Ltd. All rights reserved.
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