NDLI: Lattice polarization effects in electrochromic switching in WO3−x films studied by pulse-nanogravimetric technique

Content Provider	Springer Nature Link
Author	Hepel, Maria Dela Moss, Lumbini Indee Redmond, Haley
Copyright Year	2013
Abstract	The interactions of various types of cations with the tungsten trioxide lattice have been investigated to evaluate possible intercalation of these cations and the occurrence of lattice polarization leading to the near-surface structural lattice damage. The interactions of cations, such as the large monovalent cations (K+, Et4N+, CtMe3N+ cations), transition metal dications (Ni2+), heavy metal ions (Cd2+), and representative lanthanides (La3+) and actinides (Th4+), in competition with intercalation of H+ ions have been investigated using pulse-nanogravimetric technique. The effects of these cations in electrochromic processes of WO3 proceeding during cathodic reduction have been assessed. For all of the metal ions studied, a large increase in the apparent mass uptake (up to eightfold) in comparison to pure H+ ion ingress was observed upon the film coloration induced by a cathodic potential pulse. The experiments indicate that the apparent mass gains, although large, are insufficient to confirm predominant contribution of metal ions in the ion transport along the channels in WO3 lattice. The lower decoloration rate in the case of Ni2+ ions, in comparison to H+ and other transition metal cations (Cd2+), has been attributed to a slow dissociation of Ni2+ ions from lattice-bound oxygen atoms. For et4N+ cation, which is too large to enter channels in WO3, a dissociative reduction of the WO3 and severe lattice damage was observed. Among the metal ions investigated, only K+ ions have been found to cause a dissociative reduction of WO3 and near-surface lattice damage. Strong lattice polarization effects and irreversible binding have been found for La3+ and Th4+ cations.
Starting Page	1251
Ending Page	1260
Page Count	10
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	18
Issue Number	5
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Intercalation WO3 electrochromic films WO3 lattice polarization Dissociative reduction Heavy metal cation insertion WO3 interaction with La(III) and Th(IV) Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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