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TitleGellan gum-Ionic liquid membranes for electrochromic device application
Author(s)Neto, M. J.
Sentanin, F.
Esperança, J. M. S. S.
Medeiros, Maria José
Pawlicka, A.
Bermudez, V. D. Z.
Silva, Maria Manuela
Electrochromic devices
Ionic liquid
Ionic liquids
Issue date2015
PublisherElsevier B.V.
JournalSolid State Ionics
CitationNeto, M. J., Sentanin, F., Esperanca, J. M. S. S., Medeiros, M. J., Pawlicka, A., Bermudez, V. d. Z., & Silva, M. M. (2015). Gellan gum-Ionic liquid membranes for electrochromic device application. Solid State Ionics, 274, 64-70. doi: 10.1016/j.ssi.2015.02.011
Abstract(s)Biopolymer-based materials have been of particular interest and they are alternatives to synthetic polymers based on the decreasing oil resources. The polymer electrolytes were doped with choline-based IL N,N,Ntrimethyl- N-(2-hydroxyethyl)ammonium bis(trifluoromethylsulfonyl)imide ([N1 1 1 2(OH)][NTf2]), or Er (CF3SO3)3 or both. The polymer electrolytes were employed in the production of glass/ITO/WO3/electrolyte/ CeO2–TiO2/ITO/glass electrochromic devices (ECDs). The lowest onset temperature for the degradation of all the SPEs is at ~130 °C for the Gellan Er (CF3SO3)3 (10:1) this temperature range of stability is wide enough for a material to be applied as an electrolyte/separator component in electrochemical devices. The three ECDs displayed fast switching speed (ca. 15 s). Gellan [N1 1 1 2(OH)][NTf2] Er (CF3SO3)3 (5:1:10) exhibited an electrochromic contrast of 4.2% in the visible region, the coloration efficiency attained at 555 nm was 3.5 and 0.90 cm-2 C-1 in the “colored” and “bleached” states, respectively, and the open circuit memorywas 48 h. Preliminary tests performed with a prototype electrochromic device (ECD) incorporating WO3 as cathodic electrochromic layer, are extremely encouraging.
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