Journal
THIN SOLID FILMS
Volume 682, Issue -, Pages 163-168Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2019.02.027
Keywords
Indium-tin oxide; Electrochemistry; Dissolution reaction; Tungsten oxide; Electrochromism
Categories
Funding
- Swedish Research Council [VR-2016-03713]
- China Scholarship Council Doctoral Joint-Training Program
- University of Costa Rica
- Swedish Research Council [2016-03713] Funding Source: Swedish Research Council
- Vinnova [2016-03713] Funding Source: Vinnova
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Recent work has shown that electrochromic WO3 films, backed by In2O3:Sn (ITO) and immersed in a lithium-ion-conducting electrolyte, can attain unprecedented electrochemical cycling durability after potentiostatic pretreatment at high voltage. Here we demonstrate that this intriguing feature is associated with changes in the properties of the ITO film. Specifically, we studied thin films of ITO and WO3/ITO immersed in an electrolyte of LiClO4 in propylene carbonate at potentials up to 6.0 V vs. Li/Li+ by cyclic voltammetry and impedance spectroscopy and present evidence that electrochemical reactions occur under these conditions. X-ray photoemission spectroscopy indicated that the ITO film was partly dissolved at high voltages and that the dissolution reaction promoted diffusion of In and Sn into the WO3 film.
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