Ionic Liquids Containing Sulfonium Cations as Electrolytes for Electrochemical Double Layer Capacitors

Author(s)

Rennie, Anthony J. R. ^[1] ; Martins, Vitor L. ^{[2, 1]} ; Torresi, Roberto M. ^[2] ; Hall, Peter J. ^[1]

Affiliation

^[1] Univ Sheffield, Chem & Biol Engn, Sheffield S1 3JD, S Yorkshire - England

^[2] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Journal of Physical Chemistry C; v. 119, n. 42, p. 23865-23874, OCT 22 2015.
• Web of Science Citations: 23

Abstract

In this work, we report on the behavior of ionic liquids (ILs) containing sulfonium cations as electrolytes for electrochemical double layer capacitors (EDLCs). Physical properties such as viscosity and ionic conductivity are reported over a range of temperatures for ILs containing the diethylmethyl sulfonium {[}S-221], triethyl sulfonium {[}S-222], and diethylpropyl sulfonium {[}S-223] cations paired with the bis(trifluoromethanesulfonyl) imide {[}Tf2N] anion. The size and structure of the cations are shown to influence the physical and electrochemical properties of the ILs, with a significant degree of ionic coordination being evident in {[}S-223]{[}Tf2N]. The electrochemical behavior of these ILs in EDLCs was compared with that of a fairly established IL electrolyte, N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide ({[}Pyr(14)]{[}Tf2N]), and it is shown that {[}S-221]{[}Tf2N] can perform better in terms of energy and power at room temperature, despite operating at a much reduced potential. (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: 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