Journal
JOURNAL OF POWER SOURCES
Volume 212, Issue -, Pages 105-110Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.03.101
Keywords
Low temperature; Ambient pressure; Partially reduced; Functionalized graphene; Supercapacitors; Electrochemical properties
Funding
- National Natural Science Foundation of China [20971027]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20094420110005]
- Guangdong Provincial Natural Science Foundation of China [9251009001000006]
- Science and Technology Program of Guangdong Province of China [2009A030301008, 2010A011300041, 20118050300017]
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Thermally exfoliated graphite oxide (GO) has been prepared at a low temperature and ambient pressure usually contains flourish oxygen functional groups. We find that complete oxidized graphite can be successfully expanded, as well as partially exfoliated and reduced at a very low temperature about 200 degrees C and ambient pressure without any supplementary conditions such as high vacuum or under hydrogen environment. The electrochemical properties of supercapacitor electrodes are studied by cyclic voltammetry (CV) and galvanostatic charge/discharge (DC) methods. Supercapacitors are constructed with as-prepared functionalized graphene have good electrochemical performance, with a maximum specific capacitance of 315 F g(-1) at the charge/discharge current density of 100 mA g(-1) using 1 M KOH electrolyte and a high charge/discharge efficiency of about 97%. (C) 2012 Elsevier B.V. All rights reserved.
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