| Full text | |
| Author(s): |
Rennie, Anthony J. R.
[1]
;
Sanchez-Ramirez, Nedher
[2]
;
Torresi, Roberto M.
[2]
;
Hall, Peter J.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sheffield, Dept Chem & Biol Engn, Sheffield S1 3JD, S Yorkshire - England
[2] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of Physical Chemistry Letters; v. 4, n. 17, p. 2970-2974, SEP 5 2013. |
| Web of Science Citations: | 33 |
| Abstract | |
. Electrochemical Capacitors (ECs) are electrical energy storage devices that have the potential to be very useful in a wide range of applications, especially where there is a large disparity between peak and average power demands. The use of ionic liquids. (ILs) as electrolytes in ECs can increase the energy density of devices; however, the viscosity and conductivity of ILs adversely influence the power density of the device. We present experimental results where several ILs Containing different cations have been employed as the electrolyte in cells containing mesoporous carbon electrodes. Specifically, the behavior of ILs containing in ether bond in an alkyl side chain are compared with those of a similar structure and size but containing purely alkyl side chains. Using electrochemical impedance spectroscopy and constant current cycling we show that the presence of the ether bond can dramatically increase ` the specific capacitance and reduce device;resistance: These results have the important implication that such ILs can be used to tailor the physical properties and electrochemical performance of IL-based electrolytes. (AU) | |
| FAPESP's process: | 09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials |
| Grantee: | Roberto Manuel Torresi |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 10/08646-9 - Synthesis and characterization of ionic liquids based in phosphonium quaternary cations |
| Grantee: | Nédher Sánches Ramírez |
| Support Opportunities: | Scholarships in Brazil - Doctorate |