Large cation model of dissociative reduction of electrochromic WO3−x films

• Authors: Maria Hepel , Haley Redmond
• Languages of publication: EN

Abstracts

EN

Studies of dissociative reduction processes of electrochromic WO3−x films were conducted to: (i) evaluate their utility for electroetching and (ii) determine their fundamental mechanistic features to reduce or eliminate their occurrence in normal optical switching and modulation operation of WO3−x films. We have found that while the small intercalating cations stabilize WO3−x structure, the large nonintercalating surfactant cations (Et4N+, CtMe3N+) contribute to the dissociative reduction. While these cations do not affect WO3−x structure of anodically protected films (E > 0.2 V), they cause surface lattice polarization on electron injection to the conduction band of WO3−x at lower electrode potentials, in the absence of intercalating cations. We have found that this process is limited to the surface and no structural damage occurs to the underlying film. The mechanistic aspects of the process have been discussed on the basis of experimental voltammetric and electrochemical quartz crystal nanogravimetric (EQCN) measurements and ab initio quantum mechanical calculations. [...]

Keywords

EN

WO3 electrodissolution; Intercalation; WO3 EQCN measurements; Electrochromic film; Double-pulse chronoamperometry; Optical switching

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 2
• Pages: 234-245

Dates

published

1 - 6 - 2009

online

9 - 4 - 2009

Contributors

author

Maria Hepel

author

Haley Redmond

• Department of Chemistry, State University of New York at Potsdam, Potsdam, NY, 13676, USA

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Identifiers

DOI

10.2478/s11532-009-0009-z