Mesoporous amorphous tungsten oxide electrochromic films: a Raman analysis of their good switching behavior

被引：30

作者：

Chatzikyriakou, Dafni ^{[1
]}

Krins, Natacha ^{[1
]}

Gilbert, Bernard ^{[2
]}

Colson, Pierre ^{[1
]}

Dewalque, Jennifer ^{[1
]}

Denayer, Jessica ^{[1
]}

Cloots, Rudi ^{[1
]}

Henrist, Catherine ^{[1
]}

机构：

[1] Univ Liege, Dept Chem, Grp Res Energy & Environm Mat GREEnMat, B-4000 Liege 1, Belgium

[2] Univ Liege, Dept Chem, Analyt Chem Lab, B-4000 Liege 1, Belgium

来源：

ELECTROCHIMICA ACTA | 2014年 / 137卷

关键词：

WO3; THIN-FILMS; SOL-GEL; MICROSTRUCTURE; SPECTROSCOPY; COMPOSITE; DIFFUSION; OXYGEN;

D O I：

10.1016/j.electacta.2014.05.139

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The intercalation and de-intercalation of lithium cations in electrochromic tungsten oxide thin films are significantly influenced by their structural and surface characteristics. In this study, we prepared two types of amorphous films via the sol-gel technique: one dense and one mesoporous in order to compare their response upon lithium intercalation and de-intercalation. According to chronoamperometric measurements, Li+ intercalates/de-intercalates faster in the mesoporous film (24s/6s) than in the dense film (48s/10s). The electrochemical measurements (cyclic voltammetry and chronoamperometry) also showed worse reversibility for the dense film compared to the mesoporous film, giving rise to important Li+ trapping and remaining coloration of the film. Raman analysis showed that the mesoporous film provides more accessible and various W-O surface bonds for Li+ intercalation. On the contrary, in the first electrochemical insertion and de-insertion in the dense film, Li+ selectively reacts with a few surface W-O bonds and preferentially intercalates into pre-existing crystallites to form stable irreversible LixWO3 bronze. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：75 / 82

页数：8

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