High performance of supercapacitor based on aligned activated graphene with extremely wide temperature range

Title
High performance of supercapacitor based on aligned activated graphene with extremely wide temperature range
Issue Date
2015-08
Publisher
RSC advances
Citation
VOL 5, 71699-71703
Abstract
Supercapacitors with a broad operational temperature range, especially with the capability of operating at low temperature (below 50 C), are required for applications in extreme environments. This paper presents a high performance supercapacitor, consisting of highly aligned nano-porous graphene(A-NPG) with an eutectic mixture of ionic liquids (ILs), 1-butyl-4-methylpyridinium tetrafluoroborate (BMPBF4) in 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4), which exhibits a high capacitance performance over a temperature range from 50 C to 80 C. The experimental results reveal a reducing of melting temperature Tm of the eutectic mixture to 74 C, compared with 39 C of BMIBF4. The increased ionic conductivity and reduced Tm of the eutectic mixture, combined with ultrahigh density A-NPG electrodes, enable the supercapacitor to show a high capacitance of 125 F cm 3 at room temperature and 106 F cm 3 at 50 C. In contrast, the supercapacitor with pure BMIBF4 shows a capacitance of 119 F cm 3 and 16.5 F cm 3 at room temperature and 50 C, respectively
URI
http://pubs.kist.re.kr/handle/201004/50224
ISSN
20462069
Appears in Collections:
KIST Publication > Article
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