Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system

BACKGROUND The recycling of CO2 by photo-electrochemical reduction has attracted wide interest due to its potential benefits when compared to electro-, and photo-catalysis approaches. Among the different available semiconductors, TiO2 is the most employed material in photo-electrochemical cells. Bes...

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Autores: Castro González, Sergio, Albo Sánchez, Jonathan|||0000-0001-6781-5704, Irabien Gulías, Ángel|||0000-0002-2411-4163
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/18638
Acceso en línea:http://hdl.handle.net/10902/18638
Access Level:acceso abierto
Palabra clave:Photoelectrocatalysis
CO2 reduction
TiO2
Cu
Methanol
Ethanol
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spelling Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical systemCastro González, SergioAlbo Sánchez, Jonathan|||0000-0001-6781-5704Irabien Gulías, Ángel|||0000-0002-2411-4163PhotoelectrocatalysisCO2 reductionTiO2CuMethanolEthanolBACKGROUND The recycling of CO2 by photo-electrochemical reduction has attracted wide interest due to its potential benefits when compared to electro-, and photo-catalysis approaches. Among the different available semiconductors, TiO2 is the most employed material in photo-electrochemical cells. Besides, Cu is a well-known electrocatalyst for alcohols production from CO2 reduction. RESULTS In this study, a photo-electrochemical cell consisting on a TiO2 photoanode Membrane Electrode Assembly (MEA) and a Cu plate are employed to reduce CO2 to methanol and ethanol continuously under UV illumination (100 mW·cm-2). A maximum increment of 4.3 mA·cm-2 in current between the illuminated and dark conditions is achieved at -2 V vs. Ag/AgCl. The continuous photo-electrochemical reduction process in the filter-press cell is evaluated in terms of reaction rate (r), as well as Faradaic (FE) and energy (EE) efficiencies. At -1.8 V vs. Ag/AgCl, a maximum reaction rate of r=-9.5 -mol·m-2·s-1, FE=-16.2 % and EE=-5.2 % for methanol, and r=-6.8 -mol·m-2·s-1, FE=-23.2 % and EE=-6.8 % for ethanol can be achieved. CONCLUSIONS The potential benefits of the photoanode-driven system, in terms of yields and efficiencies, are observed when employing a TiO2-based MEA photoanode and Cu as dark cathode. The results demonstrate first the effect of UV illumination on current density, and then the formation of alcohols from the continuous photoreduction of CO2. Increasing the external applied voltage led to an enhanced production of methanol, but decreases ethanol formation. The system outperforms previous photoanode-based systems for the CO2-to-alcohols reactions.The authors gratefully acknowledge the financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) through the projects CTQ2016-76231-C2-1-R and Ramón y Cajal programme (RYC-2015-17080).Wiley-BlackwellUniversidad de Cantabria20202020-07-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/18638Journal of Chemical Technology and Biotechnology, 2020, 95(7), 1876-1882reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/186382026-06-02T12:39:31Z
dc.title.none.fl_str_mv Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
title Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
spellingShingle Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
Castro González, Sergio
Photoelectrocatalysis
CO2 reduction
TiO2
Cu
Methanol
Ethanol
title_short Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
title_full Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
title_fullStr Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
title_full_unstemmed Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
title_sort Continuous conversion of CO2 to alcohols in a TiO2 photoanode-driven photoelectrochemical system
dc.creator.none.fl_str_mv Castro González, Sergio
Albo Sánchez, Jonathan|||0000-0001-6781-5704
Irabien Gulías, Ángel|||0000-0002-2411-4163
author Castro González, Sergio
author_facet Castro González, Sergio
Albo Sánchez, Jonathan|||0000-0001-6781-5704
Irabien Gulías, Ángel|||0000-0002-2411-4163
author_role author
author2 Albo Sánchez, Jonathan|||0000-0001-6781-5704
Irabien Gulías, Ángel|||0000-0002-2411-4163
author2_role author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Photoelectrocatalysis
CO2 reduction
TiO2
Cu
Methanol
Ethanol
topic Photoelectrocatalysis
CO2 reduction
TiO2
Cu
Methanol
Ethanol
description BACKGROUND The recycling of CO2 by photo-electrochemical reduction has attracted wide interest due to its potential benefits when compared to electro-, and photo-catalysis approaches. Among the different available semiconductors, TiO2 is the most employed material in photo-electrochemical cells. Besides, Cu is a well-known electrocatalyst for alcohols production from CO2 reduction. RESULTS In this study, a photo-electrochemical cell consisting on a TiO2 photoanode Membrane Electrode Assembly (MEA) and a Cu plate are employed to reduce CO2 to methanol and ethanol continuously under UV illumination (100 mW·cm-2). A maximum increment of 4.3 mA·cm-2 in current between the illuminated and dark conditions is achieved at -2 V vs. Ag/AgCl. The continuous photo-electrochemical reduction process in the filter-press cell is evaluated in terms of reaction rate (r), as well as Faradaic (FE) and energy (EE) efficiencies. At -1.8 V vs. Ag/AgCl, a maximum reaction rate of r=-9.5 -mol·m-2·s-1, FE=-16.2 % and EE=-5.2 % for methanol, and r=-6.8 -mol·m-2·s-1, FE=-23.2 % and EE=-6.8 % for ethanol can be achieved. CONCLUSIONS The potential benefits of the photoanode-driven system, in terms of yields and efficiencies, are observed when employing a TiO2-based MEA photoanode and Cu as dark cathode. The results demonstrate first the effect of UV illumination on current density, and then the formation of alcohols from the continuous photoreduction of CO2. Increasing the external applied voltage led to an enhanced production of methanol, but decreases ethanol formation. The system outperforms previous photoanode-based systems for the CO2-to-alcohols reactions.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-07-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/18638
url http://hdl.handle.net/10902/18638
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Wiley-Blackwell
publisher.none.fl_str_mv Wiley-Blackwell
dc.source.none.fl_str_mv Journal of Chemical Technology and Biotechnology, 2020, 95(7), 1876-1882
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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