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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions

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Martins, Vitor L. [1] ; Rennie, Anthony J. R. [1] ; Sanchez-Ramirez, Nedher [2] ; Torresi, Roberto M. [2] ; Hall, Peter J. [1]
Total Authors: 5
[1] Univ Sheffield, Chem & Biol Engn, Sir Robert Hadfield Bldg, Mappin St, Sheffield S1 3JD, S Yorkshire - England
[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CHEMELECTROCHEM; v. 5, n. 4, p. 598-604, FEB 2018.
Web of Science Citations: 8

Supercapacitors are energy storage devices designed to operate at higher power densities than conventional batteries, but their energy density is still too low for many applications. Efforts are made to design new electrolytes with wider electrochemical windows than aqueous or conventional organic electrolytes in order to increase energy density. Ionic liquids (ILs) with wide electrochemical stability windows are excellent candidates to be employed as supercapacitor electrolytes. ILs containing tetracyanoborate anions {[}B(CN)(4)] offer wider electrochemical stability than conventional electrolytes and maintain a high ionic conductivity (6.9 mScm(-1)). Herein, we report the use of ILs containing the {[}B(CN)(4)] anion for such an application. They presented a high maximum operating voltage of 3.7 V, and two-electrode devices demonstrate high specific capacitances even when operating at relatively high rates (ca. 20 Fg(-1) @ 15 Ag-1). This supercapacitor stored more energy and operated at a higher power at all rates studied when compared with cells using a commonly studied ILs. (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 type: 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 type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/01987-6 - Study of lithium intercalation into different nanostructured cathode based on oxides of transition metal using ionic liquid (ILs) with low viscosity synthesized from phosphonium and tetracyanoborate like electrolytes.
Grantee:Nédher Sánches Ramírez
Support type: Scholarships in Brazil - Post-Doctorate