The gasochromic colouration of sputtered WO3 films with a low water content

被引：29

作者：

Georg, A ^{[1
]}

Graf, W ^{[1
]}

Wittwer, V ^{[1
]}

机构：

[1] Fraunhofer Inst Solar Energy Syst, D-79100 Freiburg, Germany

来源：

ELECTROCHIMICA ACTA | 2001年 / 46卷 / 13-14期

关键词：

gasochromic colouration; sputtered films; WO3; films; hydrogen diffusion;

D O I：

10.1016/S0013-4686(01)00416-9

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Sputtered WO3 films were coated with platinum and coloured by exposure to diluted hydrogen gas. Films with a high water content show a fast exponential increase of the optical density with time, whereas films with a low water content show a square root dependence, which is typical for slow diffusion. The combination of several experiments led us to a mechanism for the diffusion: the WO3 layer consists of columns with surfaces, which are covered by water. The hydrogen gas is dissociated by the Pt, and reacts with the water to form H3O+ and electrons, which reduce the WO3. The protons diffuse via the formation of H3O+ along the water on the interior WO3 surface. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：2001 / 2005

页数：5

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