Preparation of spiro-type quaternary ammonium salt via economical and efficient synthetic route as electrolyte for electric double-layer capacitor
A spiro-type quaternary ammonium salt, spiro-(1,1′)-bipyrrolidinium tetrafluoroborate (SBP-BF 4 ) was successfully prepared by an economical and efficient three-step process comprising the cyclization reaction of 1,4-dibromobutane and pyrrolidine, and subsequent ion exchange pathway with KOH followe...
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Published in | Journal of Central South University Vol. 22; no. 7; pp. 2435 - 2439 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Changsha
Central South University
01.07.2015
|
Subjects | |
Online Access | Get full text |
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Summary: | A spiro-type quaternary ammonium salt, spiro-(1,1′)-bipyrrolidinium tetrafluoroborate (SBP-BF
4
) was successfully prepared by an economical and efficient three-step process comprising the cyclization reaction of 1,4-dibromobutane and pyrrolidine, and subsequent ion exchange pathway with KOH followed by neutralization reaction via HBF
4
in the system of ethanol solution.
1
H NMR,
13
C NMR, FI-IR and XPS analyses showed the structure of SBP-BF
4
. The as-obtained SBP-BF
4
was dissolved in AN and used as the electrolyte for supercapacitor. Electrochemical measurements demonstrate that, compared with commercial electrolyte TEMA-BF
4
/AN, SBP-BF
4
/AN exhibits high ionic conductivity, lower resistance and improved cycling performance, which is due to its smaller ion size and stable symmetry structure. |
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ISSN: | 2095-2899 2227-5223 |
DOI: | 10.1007/s11771-015-2770-9 |