Ion-conducting membranes based on gelatin and containing LiI/I-2 for electrochromic devices

• Main Authors: Ponez, L., Sentanin, F.C., Majid, Siti Rohana, Arof, Abdul Kariem, Pawlicka, A.
• Format: Article
• Published: Taylor & Francis 2012
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/7698/; https://doi.org/10.1080/15421406.2012.634345
• Institution: Universiti Malaya

Ionic conducting membranes of gelatin plasticized with glycerol and containing LiI/I-2 have been obtained and characterized by X-ray diffraction measurements, UV-Vis-NIR spectroscopy, thermal analysis and impedance spectroscopy. The transparent (80-90% in the visible range) membranes showed ionic conductivity value of 5 x 10(-5) S/cm at room temperature, which increased to 3 x 10(-3) S/cm at 80 degrees C. All the ionic conductivity measurements as a function of temperature showed VTF dependence and activation energy of 8 kJ/mol. These samples also showed low glass transition temperature of -76 degrees C. Moreover the samples were predominantly amorphous. The membranes applied to small electrochromic devices showed 20% of color change from colored to bleached states during more than 70 cronoamperometric cycles.