A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.electacta.2015.10.077 http://hdl.handle.net/11449/177581 |
Resumo: | This work presents a new Si/TiO2/Pt p-n junction semiconductor prepared by sputtering, chemical vapor deposition (CVD), photolithography and lift-off techniques. XRD, EDS, FE-SEM, diffuse reflectance (DRS) and photocurrent vs potential curves had been used for semiconductor characterization. The material was designed for high porosity and uniformity of both TiO2 and Pt deposits; both TiO2 anatase phase formation and Pt presence were confirmed. This semiconductor has a characteristic of high light absorption in the ultraviolet and visible regions. A good photocurrent response for the cathodic region was obtained in a CO2 saturated solution (-1.0 mA under -0.8 V and UV-vis light), confirming electron-hole pair formation and CO2 electron scavenging. A small Si/TiO2/Pt electrode (1 × 1 cm) was employed in photoelectrocatalytic CO2 reduction, forming methanol (0.88 mmol L-1), ethanol (2.60 mmol L-1) and acetone (0.049 mmol L-1) as products reaching a Faradaic efficiency of 96.5%. These results had been obtained under the following optimal experimental conditions: 0.1 mol L-1 NaHCO3, pH 8 saturated with CO2, 125 W UV-vis irradiation (from 250 to 600 nm) and -0.8 V applied potential. Suitable charge transfer mechanisms in the electrode surface, and products formation after CO2 reduction, are proposed. |
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A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 ConversionCO2 reductionheterojunctionphotoelectrocatalysisSi/TiO2/PtThis work presents a new Si/TiO2/Pt p-n junction semiconductor prepared by sputtering, chemical vapor deposition (CVD), photolithography and lift-off techniques. XRD, EDS, FE-SEM, diffuse reflectance (DRS) and photocurrent vs potential curves had been used for semiconductor characterization. The material was designed for high porosity and uniformity of both TiO2 and Pt deposits; both TiO2 anatase phase formation and Pt presence were confirmed. This semiconductor has a characteristic of high light absorption in the ultraviolet and visible regions. A good photocurrent response for the cathodic region was obtained in a CO2 saturated solution (-1.0 mA under -0.8 V and UV-vis light), confirming electron-hole pair formation and CO2 electron scavenging. A small Si/TiO2/Pt electrode (1 × 1 cm) was employed in photoelectrocatalytic CO2 reduction, forming methanol (0.88 mmol L-1), ethanol (2.60 mmol L-1) and acetone (0.049 mmol L-1) as products reaching a Faradaic efficiency of 96.5%. These results had been obtained under the following optimal experimental conditions: 0.1 mol L-1 NaHCO3, pH 8 saturated with CO2, 125 W UV-vis irradiation (from 250 to 600 nm) and -0.8 V applied potential. Suitable charge transfer mechanisms in the electrode surface, and products formation after CO2 reduction, are proposed.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNESP Chemistry Institute of Araraquara, R. Francisco Degni 55School of Engineering and Computing Sciences Durham University, South RoadUNESP Chemistry Institute of Araraquara, R. Francisco Degni 55FAPESP: 2012/11141-1FAPESP: 2013/25343-8Universidade Estadual Paulista (Unesp)Durham UniversityGuaraldo, Thaís Tasso [UNESP]De Brito, Juliana Ferreira [UNESP]Wood, DavidZanoni, Maria Valnice Boldrin [UNESP]2018-12-11T17:26:12Z2018-12-11T17:26:12Z2015-12-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article117-124application/pdfhttp://dx.doi.org/10.1016/j.electacta.2015.10.077Electrochimica Acta, v. 185, p. 117-124.0013-4686http://hdl.handle.net/11449/17758110.1016/j.electacta.2015.10.0772-s2.0-849464169782-s2.0-84946416978.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengElectrochimica Acta1,439info:eu-repo/semantics/openAccess2023-11-27T06:13:35Zoai:repositorio.unesp.br:11449/177581Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:50:53.227671Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
title |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
spellingShingle |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion Guaraldo, Thaís Tasso [UNESP] CO2 reduction heterojunction photoelectrocatalysis Si/TiO2/Pt |
title_short |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
title_full |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
title_fullStr |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
title_full_unstemmed |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
title_sort |
A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion |
author |
Guaraldo, Thaís Tasso [UNESP] |
author_facet |
Guaraldo, Thaís Tasso [UNESP] De Brito, Juliana Ferreira [UNESP] Wood, David Zanoni, Maria Valnice Boldrin [UNESP] |
author_role |
author |
author2 |
De Brito, Juliana Ferreira [UNESP] Wood, David Zanoni, Maria Valnice Boldrin [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Durham University |
dc.contributor.author.fl_str_mv |
Guaraldo, Thaís Tasso [UNESP] De Brito, Juliana Ferreira [UNESP] Wood, David Zanoni, Maria Valnice Boldrin [UNESP] |
dc.subject.por.fl_str_mv |
CO2 reduction heterojunction photoelectrocatalysis Si/TiO2/Pt |
topic |
CO2 reduction heterojunction photoelectrocatalysis Si/TiO2/Pt |
description |
This work presents a new Si/TiO2/Pt p-n junction semiconductor prepared by sputtering, chemical vapor deposition (CVD), photolithography and lift-off techniques. XRD, EDS, FE-SEM, diffuse reflectance (DRS) and photocurrent vs potential curves had been used for semiconductor characterization. The material was designed for high porosity and uniformity of both TiO2 and Pt deposits; both TiO2 anatase phase formation and Pt presence were confirmed. This semiconductor has a characteristic of high light absorption in the ultraviolet and visible regions. A good photocurrent response for the cathodic region was obtained in a CO2 saturated solution (-1.0 mA under -0.8 V and UV-vis light), confirming electron-hole pair formation and CO2 electron scavenging. A small Si/TiO2/Pt electrode (1 × 1 cm) was employed in photoelectrocatalytic CO2 reduction, forming methanol (0.88 mmol L-1), ethanol (2.60 mmol L-1) and acetone (0.049 mmol L-1) as products reaching a Faradaic efficiency of 96.5%. These results had been obtained under the following optimal experimental conditions: 0.1 mol L-1 NaHCO3, pH 8 saturated with CO2, 125 W UV-vis irradiation (from 250 to 600 nm) and -0.8 V applied potential. Suitable charge transfer mechanisms in the electrode surface, and products formation after CO2 reduction, are proposed. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-10 2018-12-11T17:26:12Z 2018-12-11T17:26:12Z |
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.electacta.2015.10.077 Electrochimica Acta, v. 185, p. 117-124. 0013-4686 http://hdl.handle.net/11449/177581 10.1016/j.electacta.2015.10.077 2-s2.0-84946416978 2-s2.0-84946416978.pdf |
url |
http://dx.doi.org/10.1016/j.electacta.2015.10.077 http://hdl.handle.net/11449/177581 |
identifier_str_mv |
Electrochimica Acta, v. 185, p. 117-124. 0013-4686 10.1016/j.electacta.2015.10.077 2-s2.0-84946416978 2-s2.0-84946416978.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Electrochimica Acta 1,439 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
117-124 application/pdf |
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_ |
1808128990319214592 |