Journal
MATERIALS LETTERS
Volume 68, Issue -, Pages 475-477Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2011.11.008
Keywords
Carbon materials; Energy storage and conversion
Funding
- Chinese Academy of Sciences [KJCX2-YW-W26]
- Beijing Municipal Science and Technology Commission [Z111100056011007]
- National Natural Science Foundation of China [21001103, 51025726]
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Reduced graphene oxide (RGO) has been prepared with HBr as a reducing reagent. RGO-based supercapacitors in two-electrode systems have been fabricated in ionic liquid electrolytes of 1-butyl-3-methylimidazolium hexafluorphosphate (BMIPF6) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4), respectively. RGO in BMIBF4 shows higher capacitance of 74 F g(-1) at 10 mV s(-1), while RGO in BMIPF6 merely exhibits 45 F g(-1). However, due to wider potential window of 4 V for BMIPF6. RGO in BMIPF6 has higher energy and power densities. The highest power density of 27.8 kW kg(-1) is obtained at 14 A g(-1) and the maximum energy density of 18.9 Wh kg(-1) at 1 A g(-1) for BMIPF6. The exciting results infer potential application for RGO in BMIPF6. (C) 2011 Elsevier B.V. All rights reserved.
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