In situ infrared spectroscopic study of the electrochromic reactions of tungsten trioxide films

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085918· OSTI ID:7293515

Habib, M A; Maheswari, S P ^[1]

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1. General Motors Research Lab., Physical Chemistry Dept., Warren, MI (US)

This paper reports on thin WO{sub 3} films which are transparent in the oxidized state and colored in the reduced state. These changes in optical properties are associated with compositional variations of the material. Changes in vibrational intensities of W{double bond}O, W{emdash}O, and W{double bond}O{emdash}H bonds in the electrochromic WO{sub 3} film were detected by an in situ FTIR technique at various stages of reduction (coloration). The absorbance due to O{emdash}H stretching and bending vibrations was found to increase during the electrochemical reduction of the film, indicating the incorporation of water into the film along with the formation of H{sub x}WO{sub 3} bronze during coloration. The absorbance due to W{double bond}O vibration decreased while that due to W{emdash}O vibration increased during reduction. These observations suggest that during the coloration process W{double bond}O bonds break and new W{emdash}O bonds form in the film, and thus, provide direct evidence for the electrochromic reaction. O{sub 2}W{double bond}O + xH{sup +} + xe{sup {minus}} {leftrightarrow} O{sub 2}W{emdash}O{emdash}H{sub x}.

• OSTI ID: 7293515
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:7; ISSN JESOA; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
664200 -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALLOYS
BRONZE
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
COPPER ALLOYS
COPPER BASE ALLOYS
ELECTRO-OPTICAL EFFECTS
ELECTROCHROMISM
ENERGY LEVELS
EXCITED STATES
FILMS
KINETICS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
THIN FILMS
TIN ALLOYS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VIBRATIONAL STATES