| Full text | |
| Author(s): |
Martins, Vitor L.
;
Rennie, Anthony J. R.
;
Torresi, Roberto M.
;
Hall, Peter J.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 19, n. 25, p. 16867-16874, JUL 7 2017. |
| Web of Science Citations: | 10 |
| Abstract | |
We investigated the use of fluorine free ionic liquids (ILs) containing the tricyanomethanide anion ({[}C(CN)(3)]) as an electrolyte in electrochemical double-layer capacitors (EDLCs). Three cations were used; 1-butyl-3-methylimidazolium ({[}Im(1,4)]), N-butyl-N-methylpyrrolidinium ({[}Pyr(1,4)]) and N-butyl-N-methylpiperidinium ({[}Pip(1,4)]). Their physicochemical properties are discussed alongside with their performance as electrolytes. We found that the cyano-based ILs present higher ionic conductivity (9.4, 8.7 and 4.2 mS cm(-1) at 25 C for {[}Im(1,4)], {[}Pyr(1,4)] and {[}Pip(1,4)], respectively) than the widely studied IL containing the bis(trifluoromethylsulfonyl)imide anion, namely {[}Pyr(1,4)]{[}Tf2N] (2.7 mS cm(-1) at 25 C). Of the three ILs investigated, {[}Pip(1,4)]{[}C(CN)(3)] presents the widest electrochemical stability window, 3.0 V, while {[}Pyr(1,4)]{[}C(CN)(3)] is stable up to 2.9 V and its {[}Tf2N] analogue can operate at 3.5 V. Despite operating at a lower voltage, {[}Pyr(1,4)]{[}C(CN)(3)] EDLC is capable of delivering up to 4.5 W h kg(-1) when operating at high specific power of 7.2 kW kg-1, while its {[}Pyr(1,4)]{[}Tf2N] counterpart only delivered 3.0 W h kg(-1) when operated at similar power. (AU) | |
| FAPESP's process: | 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage |
| Grantee: | Roberto Manuel Torresi |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/22748-7 - Development of High Performance Electrochemical Capacitors Based on Graphene and Ionic Liquids. |
| Grantee: | Vitor Leite Martins |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/14690-1 - Development and improvement of electrochemical capacitors containing ionic liquids as electrolytes |
| Grantee: | Vitor Leite Martins |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |