Polymer electrolytes for electrochromic devices through solvent casting and sol-gel routes

Author(s)

Leones, Rita ; Sabadini, Rodrigo C. ; Sentanin, Franciani C. ; Esperanca, Jose M. S. S. ; Pawlicka, Agnieszka ; Silva, Maria Manuela

• Document type: Journal article
• Source: SOLAR ENERGY MATERIALS AND SOLAR CELLS; v. 169, p. 98-106, SEP 2017.
• Web of Science Citations: 7

Abstract

Ionically conductive membranes of gelatin and d-PCL(530)/siloxane doped with cyano-based ionic liquids (ILs) were prepared through solvent casting and sol-gel methods, respectively. The membranes were characterized in terms of ionic conductivity, thermal behavior, morphology, and structure. All samples, except the d-PCL(530)/siloxane matrix, exhibited a predominantly amorphous morphology. The samples prepared through solvent casting and sol-gel displayed a minimum thermal stability of 170 and 230 degrees C, respectively. The ionic conductivity varied according with the type, quantity, and length of the alkyl chain of the cation of the ILs. The sample with the highest ionic conductivity was gelatin(0.5){[}C(2)mim] {[}N(CN)(2)] with 2.40 x 10(-3) S cm(-1) at 25 degrees C and 1.68 x 10(-2) S cm(-1) at 95 degrees C. The good results of ionic conductivity encouraged the assembly and characterization of prototypes of electrochromic devices (ECDs). The best results were obtained with glass/ITO/WO3/gelatins(1) {[}C(2)mim] {[}SCN]/CeO2-TiO2/ITO/glass configuration that showed a fast color switching time (similar to 15 s) and a good open circuit memory (similar to 4 h). The ECD changed its color from pale blue to transparent, and its charge density decreased from -17.53 to -2.71 mC cm(-2) during 640 color/bleaching cycles. (AU)

• FAPESP's process: 14/17174-4 - Reflective properties of electrochromic devices with polymer electrolytes
• Grantee: Agnieszka Joanna Pawlicka Maule
• Support Opportunities: Multi-user Equipment Program