| Full text | |
| Author(s): |
Benedetti, Tania M.
[1]
;
Carvalho, Tania
[2]
;
Lwakura, Daniel C.
[1]
;
Braga, Filipe
[1]
;
Vieira, Bruna R.
[1]
;
Vidinha, Pedro
[2]
;
Gruber, Jonas
[1]
;
Torresi, Roberto M.
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil
[2] Univ Nova Lisboa, Fac Ciencias & Tecnol, REQUIMTE, Dept Quim, P-2829516 Caparica - Portugal
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | SOLAR ENERGY MATERIALS AND SOLAR CELLS; v. 132, p. 101-106, JAN 2015. |
| Web of Science Citations: | 14 |
| Abstract | |
An all solid-state electrochromic system made of a viologen dissolved in a gelatin-based ionogel called Ion Jelly is presented. The obtained Ion Jelly possesses higher ionic conductivity than the constituent ionic liquid, which is ascribed to the broken ionic aggregates caused by the presence of water. Spectro-electrochemical studies carried out with the solid-state cell show that the kinetics of the reduction process is slower than that of the oxidation process, as denoted by the calculated time constants obtained from current vs. time plots. This may be owing to formation of an insoluble reduced species, which remains at the surface of the current collector, facilitating its oxidation process. The kinetics studies also show that the color change in response to the charge transfer process is faster during the reduction step. Both reversibility and durability of the device, upon successive oxidation/reduction steps, are related with the employed reduction potential, being the best compromise with the color contrast achieved at -0.25 V vs. Ag/Ag+, where 30% of transmittance change is observed up to 75 switching cycles. (C) 2014 Elsevier B.V. All rights reserved. (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: | 12/02117-0 - Poly(ionic liquids) in electrochemical devices: polyelectrolytes for energy storage and conversion devices and stabilization of graphene and poly(3,4-etylenedioxidethiophene) (PEDOT) for electroactive films obtention |
| Grantee: | Tania Machado Benedetti |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |