期刊
ELECTROCHIMICA ACTA
卷 105, 期 -, 页码 635-641出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.05.050
关键词
Rice husk; Conventional heating; Microwave heating; Porous carbon; Supercapacitor
资金
- National Science Foundation of China [51272004, 50802002]
- Guangdong Provincial Lab of Green Chemical Technology, China
Rice husk, a renewable agricultural by-product, was used as a precursor for the fabrication of high performance porous carbons for supercapacitors by ZnCl2 activation with or without microwave-assisted heating. Microporous carbons with the surface area bigger than 1442 m(2)/g are made at a ZnCl2/rice husk mass ratio as low as 1/1 from rice husk, which is really worthwhile from the viewpoint of economic, environmental and societal issues. Mesoporous carbons with high surface area and mesopore percentage are made in one-step ZnCl2 activation process by microwave-assisted heating, and the supercapacitors based on mesoporous carbons show high energy density and excellent rate performance in 6 M KOH electrolyte. The specific capacitance of rice husk-derived mesoporous carbons made by conventional heating retains 243 F/g after 1000 charge-discharge cycles. The findings suggest a simple yet efficient approach to producing cost-effective porous carbons with high performance for supercapacitors. (c) 2013 Elsevier Ltd. All rights reserved.
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