Variable-emittance electrochromic devices and methods of preparing the same

摘要

Variable-emittance, electrochromic devices utilizing IR-active conducting polymers and methods of preparing the same are disclosed.

主权项

1. A flexible, variable-emittance, electrochromic device comprising:
(a) a working electrode comprising:
(i) an IR-active, electrochromic conducting polymer layer;(ii) an electrolyte permeable substrate layer; and(iii) a conductive reflective layer disposed between the electrolyte permeable substrate layer and the conducting polymer layer; and (b) an ionic liquid electrolyte in electrochemical communication with the conducting polymer layer; the ionic liquid electrolyte comprising at least one counterion, wherein the ionic liquid electrolyte comprises 1-butyl-3-methyl imidazoliumtetrafluoroborate (BMIM-BF4), 1-butyl-3-methyl imidazoliumtrifluoroacetate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 1-ethyl-3-methyl imidazoliumtetrafluoroborate (EMIM-BF4), BMIM-bis(trifluoromethylsulfonyl)amide (BMIM-TF2N), 1-(4-sulfobutyl)-3-methylimidazolium trifluoromethanesulfonate, or a combination thereof;
wherein the electrochromic conducting polymer layer incorporates the at least one counterion of the ionic liquid electrolyte in an amount effective to enable efficient electrochromic switching of the device at temperatures of about −80° C. to about 95° C.