Influence of water on the electrochemical properties of CeO2-TiO2 sol-gel coatings and electrochromic devices

Dong Lan Sun; Joerg Puetz; Sabine Heusing; Michel Andre Aegerter

doi:10.1117/12.453903

23 October 2002 Influence of water on the electrochemical properties of CeO₂TiO₂ sol-gel coatings and electrochromic devices

Dong Lan Sun, Joerg Puetz, Sabine Heusing, Michel Andre Aegerter

Author Affiliations +

Proceedings Volume 4804, Sol-Gel Optics VI; (2002) https://doi.org/10.1117/12.453903
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The paper focuses on a systematic study of the influence of water on the electrochemical and optical properties of CeO₂-TiO₂ amd WO₃ sol-gel coatings as well as devices made with these layers. The coatings were studied electrochemically in 1 M LiC1O₄ in propylene carbonate electrolyte with water content up to 3 wt%. The intercalculated and deintercalated charge was measured during Cyclic Voltammetry (CV) and Chronoamperometric (CA) cycles up to 500 cycles (TiO₂-CeO₂) and 7000 cycles (WO₃). For CeO₂-TiO₂ it was found to increase from 3mC/cm² (dry electrolyte) up to 11 mC/cm² (3 wt% water). This increase is important for the coloration of EC-devices because the charge capacity of this counter electrode is known to be a limiting factor for the transmission change of the EC-devices. For WO₃ coatings, the transmission change (T_colored-T_bleached)is higher in wet electrolytes (1 wt% water) than dry electrolyte and above all remains constant (74%). These improvements are essentially due to an increase of the kinetics of the intercalation and deintercalation of Li⁺ ions. The electro-optical behavior of solid state EC-devices with and without incorporation of water in the solid electrolyte measured up to 500000 CA cycles is also presented and discussed.

Citation Download Citation

Dong Lan Sun, Joerg Puetz, Sabine Heusing, and Michel Andre Aegerter "Influence of water on the electrochemical properties of CeO₂TiO₂ sol-gel coatings and electrochromic devices", Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); https://doi.org/10.1117/12.453903

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