Studies on spontaneously reduced vanadium pentoxide xerogel coatings for electro-chromic applications

The aging-induced spontaneous reduction of vanadium pentoxide (V2O5) xerogel coatings and its effects on their electro-chromic properties were investigated through optical and electrochemical techniques. The color change could visually confirm the changes in the oxidation states and formation of V4+...

Full description

Saved in:
Bibliographic Details
Published in:Electrochimica acta 2021-09, Vol.389, p.138629, Article 138629
Main Authors: Surendren, Sajitha, Deb, Biswapriya
Format: Article
Language:English
Subjects:
Aging
Aging (artificial)
Coatings
Electrochromic
Electrochromism
Electrophoresis
Morphology
Optical properties
Optoelectronic devices
Oxidation
Reduction
Spontaneous reduction
Thickness
Vanadium pentoxide
Work functions
Xerogel
Xerogels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The aging-induced spontaneous reduction of vanadium pentoxide (V2O5) xerogel coatings and its effects on their electro-chromic properties were investigated through optical and electrochemical techniques. The color change could visually confirm the changes in the oxidation states and formation of V4+, which quantitatively reach ~25% after three weeks of aging. Here, the xerogel coatings with three different thicknesses were fabricated using sol-electrophoresis. Detailed examination revealed that such self-reduction eventually affects the entire thickness range and considerably decreases the near-surface work function by 0.31-0.36 eV. The coating thicknesses were found to be a dominating factor that controls film morphology, reactivity, and the final opto-electronic response through the formation of midgap-states. The devices made with aged films exhibited relatively better electrochromic performances with higher optical contrast, better coloration efficiency, and faster Li+ intercalation kinetics.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.138629