期刊
CARBON
卷 69, 期 -, 页码 287-293出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.12.027
关键词
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资金
- National Science Council of the Republic of China (Taiwan) [NSC-101-2221-E-007-111-MY3]
- Low Carbon Energy Research Center of the National Tsing-Hua University
Tungsten oxide, originally poor in capacitive performance, was made an excellent electrode material for supercapacitors, by dispersing it to carbon aerogels (CA), a conductive and mesoporous hosting template, that drastically improved the utilization of WO3 for capacitance generation. The WO3 was introduced to the CA, in a form of well-dispersed single crystalline nanoparticles of 15-40 nm in size, with a simple immersion-calcination process. A one order of magnitude improvement in specific capacitance was achieved with the present composition, from 54 F/g for WO3 nanoparticles to 700 F/g for WO3/CA composites (scaned at 25 mV/s in 0.5 M H2SO4 over a potential window of -0.3 to 0.5 V). The WO3/CA composites exhibited an excellent high rate capability with a 60% retention in specific capacitance at 500 mV/s, almost perfect cycle efficiency of 99%, and outstanding cycling stability of only 5% decay in specific capacitance after 4000 cycles. (C) 2013 Elsevier Ltd. All rights reserved.
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