Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apsusc.2020.146927 http://hdl.handle.net/11449/201879 |
Resumo: | Indirect photoelectrochemical processes are possible when employing a palladium film to separate photochemical and electrochemical reactions. Here, an exploratory indirect photoelectrochemical system is developed based on ZnO or Pt@ZnO nanoparticle photocatalysts ambiently deposited onto platinum, glassy carbon, or palladium membrane electrodes and exposed to blue (385 nm) LED light in the presence of glucose hole quencher (in aqueous NaCl). It is demonstrated that under these conditions photo-excitation followed by charge transport of conduction band electrons via inter-grain conduction across ZnO particles triggers the photo-current responses. The conduction band electrons then trigger formation of interstitial hydrogen in a palladium membrane. Transport of the hydrogen across the palladium membrane into the electrochemical compartment occurs within 1–2 min of switching on the light. A proof-of-principle fuel cell with oxygen gas diffusion electrode (cathode) and indirect photo-anode is shown to operate with up to 28 μW cm−2 power output during illumination. Important power-limiting parameters and suggestions for future improvements are discussed. |
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Repositório Institucional da UNESP |
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Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticlesGlucosePalladium membranePhotocatalytic hydrogen generationPt@ZnOZnO nanoparticlesIndirect photoelectrochemical processes are possible when employing a palladium film to separate photochemical and electrochemical reactions. Here, an exploratory indirect photoelectrochemical system is developed based on ZnO or Pt@ZnO nanoparticle photocatalysts ambiently deposited onto platinum, glassy carbon, or palladium membrane electrodes and exposed to blue (385 nm) LED light in the presence of glucose hole quencher (in aqueous NaCl). It is demonstrated that under these conditions photo-excitation followed by charge transport of conduction band electrons via inter-grain conduction across ZnO particles triggers the photo-current responses. The conduction band electrons then trigger formation of interstitial hydrogen in a palladium membrane. Transport of the hydrogen across the palladium membrane into the electrochemical compartment occurs within 1–2 min of switching on the light. A proof-of-principle fuel cell with oxygen gas diffusion electrode (cathode) and indirect photo-anode is shown to operate with up to 28 μW cm−2 power output during illumination. Important power-limiting parameters and suggestions for future improvements are discussed.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)São Paulo State University (Unesp) Institute of ChemistryNational Institute of Alternative Technologies for Detection Toxicological Evaluation and Removal of Micropollutants and Radioactive Substances (INCT-DATREM) São Paulo State University (Unesp) Institute of ChemistryUniversity of Bath Department of ChemistryUniversity of Bath Materials and Chemical Characterisation Facility MC2São Paulo State University (Unesp) Institute of ChemistryNational Institute of Alternative Technologies for Detection Toxicological Evaluation and Removal of Micropollutants and Radioactive Substances (INCT-DATREM) São Paulo State University (Unesp) Institute of ChemistryFAPESP: 2014/50945-1FAPESP: 2019/07020-3FAPESP: 465571/2014-0FAPESP: INCT-DATRENUniversidade Estadual Paulista (Unesp)University of BathMaterials and Chemical Characterisation Facility MC2Irikura, Kallyni [UNESP]Marken, FrankFletcher, Philip J.Kociok-Köhn, GabrieleZanoni, Maria Valnice Boldrin [UNESP]2020-12-12T02:44:15Z2020-12-12T02:44:15Z2020-10-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.apsusc.2020.146927Applied Surface Science, v. 527.0169-4332http://hdl.handle.net/11449/20187910.1016/j.apsusc.2020.1469272-s2.0-85086461870Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Surface Scienceinfo:eu-repo/semantics/openAccess2021-10-23T02:54:00Zoai:repositorio.unesp.br:11449/201879Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:15:40.372465Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
title |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
spellingShingle |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles Irikura, Kallyni [UNESP] Glucose Palladium membrane Photocatalytic hydrogen generation Pt@ZnO ZnO nanoparticles |
title_short |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
title_full |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
title_fullStr |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
title_full_unstemmed |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
title_sort |
Direct and indirect light energy harvesting with films of ambiently deposited ZnO nanoparticles |
author |
Irikura, Kallyni [UNESP] |
author_facet |
Irikura, Kallyni [UNESP] Marken, Frank Fletcher, Philip J. Kociok-Köhn, Gabriele Zanoni, Maria Valnice Boldrin [UNESP] |
author_role |
author |
author2 |
Marken, Frank Fletcher, Philip J. Kociok-Köhn, Gabriele Zanoni, Maria Valnice Boldrin [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) University of Bath Materials and Chemical Characterisation Facility MC2 |
dc.contributor.author.fl_str_mv |
Irikura, Kallyni [UNESP] Marken, Frank Fletcher, Philip J. Kociok-Köhn, Gabriele Zanoni, Maria Valnice Boldrin [UNESP] |
dc.subject.por.fl_str_mv |
Glucose Palladium membrane Photocatalytic hydrogen generation Pt@ZnO ZnO nanoparticles |
topic |
Glucose Palladium membrane Photocatalytic hydrogen generation Pt@ZnO ZnO nanoparticles |
description |
Indirect photoelectrochemical processes are possible when employing a palladium film to separate photochemical and electrochemical reactions. Here, an exploratory indirect photoelectrochemical system is developed based on ZnO or Pt@ZnO nanoparticle photocatalysts ambiently deposited onto platinum, glassy carbon, or palladium membrane electrodes and exposed to blue (385 nm) LED light in the presence of glucose hole quencher (in aqueous NaCl). It is demonstrated that under these conditions photo-excitation followed by charge transport of conduction band electrons via inter-grain conduction across ZnO particles triggers the photo-current responses. The conduction band electrons then trigger formation of interstitial hydrogen in a palladium membrane. Transport of the hydrogen across the palladium membrane into the electrochemical compartment occurs within 1–2 min of switching on the light. A proof-of-principle fuel cell with oxygen gas diffusion electrode (cathode) and indirect photo-anode is shown to operate with up to 28 μW cm−2 power output during illumination. Important power-limiting parameters and suggestions for future improvements are discussed. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T02:44:15Z 2020-12-12T02:44:15Z 2020-10-15 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apsusc.2020.146927 Applied Surface Science, v. 527. 0169-4332 http://hdl.handle.net/11449/201879 10.1016/j.apsusc.2020.146927 2-s2.0-85086461870 |
url |
http://dx.doi.org/10.1016/j.apsusc.2020.146927 http://hdl.handle.net/11449/201879 |
identifier_str_mv |
Applied Surface Science, v. 527. 0169-4332 10.1016/j.apsusc.2020.146927 2-s2.0-85086461870 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Surface Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128911855321088 |