Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400025 |
Resumo: | Amorphous vanadium oxide films were synthesized onto ITO-coated glass substrates by the hot filament metal oxide deposition technique. The as-deposited samples were heat-treated in an argon atmosphere. X-ray diffraction analysis revealed that the films treated at 200 and 300 ºC were still amorphous, while those treated at 400 and 500 ºC were crystalline, with a V2O5 structure. All electrodes were electrochemically reversible for Li+ intercalation, exhibiting the electrochromic effect, observed from optical transmittance measurements at 632.8 nm. The Li-diffusion coefficient, DC, was measured by the galvanostatic intermittent titration technique (GITT) as function of the inserted charge. For the crystalline films it was observed that the optical absorbance and the DC increase with increasing Li insertion in the single-phase regions of crystalline Li xV2O5 and decrease in the two-phase regions. For the latter, an effective DC was considered. The presence of other vanadium oxides mixed to the V2O5 matrix was inferred for the crystalline films from the chronopotentiometric and DC measurements. |
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Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodesvanadium oxide filmchronopotentiometricDC measurementsAmorphous vanadium oxide films were synthesized onto ITO-coated glass substrates by the hot filament metal oxide deposition technique. The as-deposited samples were heat-treated in an argon atmosphere. X-ray diffraction analysis revealed that the films treated at 200 and 300 ºC were still amorphous, while those treated at 400 and 500 ºC were crystalline, with a V2O5 structure. All electrodes were electrochemically reversible for Li+ intercalation, exhibiting the electrochromic effect, observed from optical transmittance measurements at 632.8 nm. The Li-diffusion coefficient, DC, was measured by the galvanostatic intermittent titration technique (GITT) as function of the inserted charge. For the crystalline films it was observed that the optical absorbance and the DC increase with increasing Li insertion in the single-phase regions of crystalline Li xV2O5 and decrease in the two-phase regions. For the latter, an effective DC was considered. The presence of other vanadium oxides mixed to the V2O5 matrix was inferred for the crystalline films from the chronopotentiometric and DC measurements.Sociedade Brasileira de Química2008-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400025Journal of the Brazilian Chemical Society v.19 n.4 2008reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532008000400025info:eu-repo/semantics/openAccessScarminio,JairCatarini,Paulo R.Urbano,AlexandreGelamo,Rogério V.Rouxinol,Francisco P.Moraes,Mário A. Bica deeng2008-06-11T00:00:00Zoai:scielo:S0103-50532008000400025Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2008-06-11T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
title |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
spellingShingle |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes Scarminio,Jair vanadium oxide film chronopotentiometric DC measurements |
title_short |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
title_full |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
title_fullStr |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
title_full_unstemmed |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
title_sort |
Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes |
author |
Scarminio,Jair |
author_facet |
Scarminio,Jair Catarini,Paulo R. Urbano,Alexandre Gelamo,Rogério V. Rouxinol,Francisco P. Moraes,Mário A. Bica de |
author_role |
author |
author2 |
Catarini,Paulo R. Urbano,Alexandre Gelamo,Rogério V. Rouxinol,Francisco P. Moraes,Mário A. Bica de |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Scarminio,Jair Catarini,Paulo R. Urbano,Alexandre Gelamo,Rogério V. Rouxinol,Francisco P. Moraes,Mário A. Bica de |
dc.subject.por.fl_str_mv |
vanadium oxide film chronopotentiometric DC measurements |
topic |
vanadium oxide film chronopotentiometric DC measurements |
description |
Amorphous vanadium oxide films were synthesized onto ITO-coated glass substrates by the hot filament metal oxide deposition technique. The as-deposited samples were heat-treated in an argon atmosphere. X-ray diffraction analysis revealed that the films treated at 200 and 300 ºC were still amorphous, while those treated at 400 and 500 ºC were crystalline, with a V2O5 structure. All electrodes were electrochemically reversible for Li+ intercalation, exhibiting the electrochromic effect, observed from optical transmittance measurements at 632.8 nm. The Li-diffusion coefficient, DC, was measured by the galvanostatic intermittent titration technique (GITT) as function of the inserted charge. For the crystalline films it was observed that the optical absorbance and the DC increase with increasing Li insertion in the single-phase regions of crystalline Li xV2O5 and decrease in the two-phase regions. For the latter, an effective DC was considered. The presence of other vanadium oxides mixed to the V2O5 matrix was inferred for the crystalline films from the chronopotentiometric and DC measurements. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400025 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000400025 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532008000400025 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.19 n.4 2008 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318168979537920 |