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Proceedings Paper

Influence of water on the electrochemical properties of CeO2-TiO2 sol-gel coatings and electrochromic devices
Author(s): Dong Lan Sun; Joerg Puetz; Sabine Heusing; Michel Andre Aegerter
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Paper 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 (Tcolored-Tbleached)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.

Paper Details

Date Published: 23 October 2002
PDF: 9 pages
Proc. SPIE 4804, Sol-Gel Optics VI, (23 October 2002); doi: 10.1117/12.453903
Show Author Affiliations
Dong Lan Sun, Institut für Neue Materialien GmbH (Germany)
Joerg Puetz, Institut für Neue Materialien GmbH (Germany)
Sabine Heusing, Institut für Neue Materialien GmbH (Germany)
Michel Andre Aegerter, Institut für Neue Materialien GmbH (Germany)

Published in SPIE Proceedings Vol. 4804:
Sol-Gel Optics VI
Edward J. A. Pope; Helmut K. Schmidt; Bruce S. Dunn; Shuichi Shibata, Editor(s)

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