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

Rita Leones, Rodrigo C. Sabadini, Franciani C. Sentanin, José M. S. S. Esperança, Agnieszka Pawlicka, Maria Manuela Silva

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14 Citations (Scopus)


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 °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 gelatin0.5[C2mim][N(CN)2] with 2.40×10−3 S cm−1 at 25 °C and 1.68×10−2 S cm−1 at 95 °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/gelatin1[C2mim][SCN]/CeO2-TiO2/ITO/glass configuration that showed a fast color switching time (~15 s) and a good open circuit memory (~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.

Original languageEnglish
Pages (from-to)98-106
Number of pages9
JournalSolar Energy Materials and Solar Cells
Publication statusPublished - 1 Sep 2017


  • Cyano-based ionic liquids
  • Electrochromic device
  • Sol-gel
  • Solid polymer electrolyte
  • Solvent casting

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