@article {18693, title = {Electrochromic devices incorporating biohybrid electrolytes doped with a lithium salt, an ionic liquid or a mixture of both}, journal = {Electrochimica Acta}, volume = {161}, year = {2015}, month = {2015-04-10 00:00:00}, pages = {226-235}, publisher = {Elsevier Ltd.}, abstract = {

The sol-gel method was employed in the synthesis of di-urethane cross-linked poly(ϵ-caprolactone) (PCL(530))/siloxane biohybrid ormolytes incorporating either a mixture of lithium triflate (LiCF3SO3) and the ionic liquid (IL) 1-ethyl-3-methyl imidazolium tetrafluoroborate ([Emim]BF4), or solely with [Emim]BF4\ or LiCF3SO3. The ormolyte doped with [Emim]BF4\ is thermally more stable and exhibits higher ionic conductivity (4\ {\texttimes}\ 10-4\ and 2\ {\texttimes}\ 10-3\ S cm-1\ at 36 and 98\ {\textdegree}C, respectively) than those containing the LiCF3SO3/[Emim]BF4\ mixture or just LiCF3SO3. The three ormolytes were employed in the production of glass/ITO/ormolyte/WO3/ITO/glass electrochromic devices (ECDs) designated as ECD@Y with Y\ =\ Li-[Emim]BF4, [Emim]BF4\ and Li. The three ECDs displayed fast switching speed (ca. 30\ s). ECD@Li-[Emim]BF4\ exhibited an electrochromic contrast of 18.4\% and an optical density change of 0.11 in the visible region, the coloration efficiency attained at 555\ nm was 152 and 80.2\ cm2C-1\ in the {\textquotedblleft}on{\textquotedblright} and {\textquotedblleft}off{\textquotedblright} states, respectively, and the open circuit memory was 48\ hours. In the {\textquotedblleft}on{\textquotedblright} state the CIE 1931 color space coordinates were x\ =\ 0.29 and y\ =\ 0.30, corresponding to blue color.

}, keywords = {1-ethyl-3-methyl imidazolium tetrafluoroborate, electrochromic devices, lithium triflate, organic-inorganic biohybrids, sol-gel process}, issn = {0013-4686}, doi = {10.1016/j.electacta.2015.02.036}, url = {http://www.sciencedirect.com/science/article/pii/S0013468615003138}, author = {Fernandes, M. and Leones, R. and Costa, A. M. S. and Silva, M. M. and Pereira, S. and Mano, J. F. and Fortunato, E. and Rego, R. and de Bermudez, Z. V.} }