Ion Trapping and Detrapping in Amorphous Tungsten Oxide Thin Films Observed by Real-Time Electro-Optical Monitoring

Rui Tao Wen, Miguel A. Arvizu, Michael Morales-Luna, Claes G. Granqvist, Gunnar A. Niklasson

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Several technologies for energy saving and storage rely on ion exchange between electrodes and electrolytes. In amorphous electrode materials, a detailed knowledge of Li-ion intercalation is hampered by limited information about the structure and transport properties of the materials. Amorphous tungsten oxide is the most studied electrochromic material and suffers from ion trapping-induced degradation of charge capacity and optical modulation span upon extensive electrochemical cycling. In this paper, we investigate trapping and detrapping processes in connection with performance degradation and specifically use real-time electro-optical monitoring to identify different trap energy ranges pertinent to the ion-intercalated system. Evidence of three kinds of traps that degrade electrochromic tungsten oxide during ion intercalation is presented: (i) shallow traps that Erode the colored state, (ii) deep traps that lower the bleached-state transmittance, and (iii) irreversible traps. Importantly, Li-ion detrapping from shallow and deep traps takes place by different processes: continuous Li-ion extraction is possible from shallow traps, whereas a certain release time must be exceeded for detrapping from deep traps. Our notions for ion trapping and detrapping, presented here, may serve as a starting point for discussing ion intercalation in various amorphous materials of interest for energy-related applications.

Original languageEnglish
Pages (from-to)4670-4676
Number of pages7
JournalChemistry of Materials
Volume28
Issue number13
DOIs
Publication statusPublished - 12 Jul 2016
Externally publishedYes

Fingerprint

Oxide films
Tungsten
Ions
Thin films
Monitoring
Intercalation
Degradation
Electrodes
Oxides
tungsten oxide
Light modulation
Transport properties
Energy storage
Electrolytes
Ion exchange
Energy conservation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Wen, Rui Tao ; Arvizu, Miguel A. ; Morales-Luna, Michael ; Granqvist, Claes G. ; Niklasson, Gunnar A. / Ion Trapping and Detrapping in Amorphous Tungsten Oxide Thin Films Observed by Real-Time Electro-Optical Monitoring. In: Chemistry of Materials. 2016 ; Vol. 28, No. 13. pp. 4670-4676.
@article{3a8ae4f91d0043f38fefe11989f6edfc,
title = "Ion Trapping and Detrapping in Amorphous Tungsten Oxide Thin Films Observed by Real-Time Electro-Optical Monitoring",
abstract = "Several technologies for energy saving and storage rely on ion exchange between electrodes and electrolytes. In amorphous electrode materials, a detailed knowledge of Li-ion intercalation is hampered by limited information about the structure and transport properties of the materials. Amorphous tungsten oxide is the most studied electrochromic material and suffers from ion trapping-induced degradation of charge capacity and optical modulation span upon extensive electrochemical cycling. In this paper, we investigate trapping and detrapping processes in connection with performance degradation and specifically use real-time electro-optical monitoring to identify different trap energy ranges pertinent to the ion-intercalated system. Evidence of three kinds of traps that degrade electrochromic tungsten oxide during ion intercalation is presented: (i) shallow traps that Erode the colored state, (ii) deep traps that lower the bleached-state transmittance, and (iii) irreversible traps. Importantly, Li-ion detrapping from shallow and deep traps takes place by different processes: continuous Li-ion extraction is possible from shallow traps, whereas a certain release time must be exceeded for detrapping from deep traps. Our notions for ion trapping and detrapping, presented here, may serve as a starting point for discussing ion intercalation in various amorphous materials of interest for energy-related applications.",
author = "Wen, {Rui Tao} and Arvizu, {Miguel A.} and Michael Morales-Luna and Granqvist, {Claes G.} and Niklasson, {Gunnar A.}",
year = "2016",
month = "7",
day = "12",
doi = "10.1021/acs.chemmater.6b01503",
language = "English",
volume = "28",
pages = "4670--4676",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "13",

}

Ion Trapping and Detrapping in Amorphous Tungsten Oxide Thin Films Observed by Real-Time Electro-Optical Monitoring. / Wen, Rui Tao; Arvizu, Miguel A.; Morales-Luna, Michael; Granqvist, Claes G.; Niklasson, Gunnar A.

In: Chemistry of Materials, Vol. 28, No. 13, 12.07.2016, p. 4670-4676.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ion Trapping and Detrapping in Amorphous Tungsten Oxide Thin Films Observed by Real-Time Electro-Optical Monitoring

AU - Wen, Rui Tao

AU - Arvizu, Miguel A.

AU - Morales-Luna, Michael

AU - Granqvist, Claes G.

AU - Niklasson, Gunnar A.

PY - 2016/7/12

Y1 - 2016/7/12

N2 - Several technologies for energy saving and storage rely on ion exchange between electrodes and electrolytes. In amorphous electrode materials, a detailed knowledge of Li-ion intercalation is hampered by limited information about the structure and transport properties of the materials. Amorphous tungsten oxide is the most studied electrochromic material and suffers from ion trapping-induced degradation of charge capacity and optical modulation span upon extensive electrochemical cycling. In this paper, we investigate trapping and detrapping processes in connection with performance degradation and specifically use real-time electro-optical monitoring to identify different trap energy ranges pertinent to the ion-intercalated system. Evidence of three kinds of traps that degrade electrochromic tungsten oxide during ion intercalation is presented: (i) shallow traps that Erode the colored state, (ii) deep traps that lower the bleached-state transmittance, and (iii) irreversible traps. Importantly, Li-ion detrapping from shallow and deep traps takes place by different processes: continuous Li-ion extraction is possible from shallow traps, whereas a certain release time must be exceeded for detrapping from deep traps. Our notions for ion trapping and detrapping, presented here, may serve as a starting point for discussing ion intercalation in various amorphous materials of interest for energy-related applications.

AB - Several technologies for energy saving and storage rely on ion exchange between electrodes and electrolytes. In amorphous electrode materials, a detailed knowledge of Li-ion intercalation is hampered by limited information about the structure and transport properties of the materials. Amorphous tungsten oxide is the most studied electrochromic material and suffers from ion trapping-induced degradation of charge capacity and optical modulation span upon extensive electrochemical cycling. In this paper, we investigate trapping and detrapping processes in connection with performance degradation and specifically use real-time electro-optical monitoring to identify different trap energy ranges pertinent to the ion-intercalated system. Evidence of three kinds of traps that degrade electrochromic tungsten oxide during ion intercalation is presented: (i) shallow traps that Erode the colored state, (ii) deep traps that lower the bleached-state transmittance, and (iii) irreversible traps. Importantly, Li-ion detrapping from shallow and deep traps takes place by different processes: continuous Li-ion extraction is possible from shallow traps, whereas a certain release time must be exceeded for detrapping from deep traps. Our notions for ion trapping and detrapping, presented here, may serve as a starting point for discussing ion intercalation in various amorphous materials of interest for energy-related applications.

UR - http://www.scopus.com/inward/record.url?scp=84978370332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84978370332&partnerID=8YFLogxK

U2 - 10.1021/acs.chemmater.6b01503

DO - 10.1021/acs.chemmater.6b01503

M3 - Article

AN - SCOPUS:84978370332

VL - 28

SP - 4670

EP - 4676

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 13

ER -