Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion

The development of efficient photoanodes that reduce external energy requirements for the electrochemical conversion of CO2 to formate is essential for the future implementation of this technology. In this work, we explore different photoanode structures based on electrodeposited BiVO4 onto transpar...

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Autores: Abarca, José Antonio, Molera Janer, Martí, Merino-García, Ivan, Díaz-Sainz, Guillermo, Irabien, Angel, Solla-Gullón, José, Fàbrega Gallego, Cristian, Andreu Arbella, Teresa, Albo, Jonathan
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2025
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/222064
Acceso en línea:https://hdl.handle.net/2445/222064
Access Level:acceso abierto
Palabra clave:Electroquímica
Bismut
Fotònica
Electrochemistry
Bismuth
Photonics
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spelling Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversionAbarca, José AntonioMolera Janer, MartíMerino-García, IvanDíaz-Sainz, GuillermoIrabien, AngelSolla-Gullón, JoséFàbrega Gallego, CristianAndreu Arbella, TeresaAlbo, JonathanElectroquímicaBismutFotònicaElectrochemistryBismuthPhotonicsThe development of efficient photoanodes that reduce external energy requirements for the electrochemical conversion of CO2 to formate is essential for the future implementation of this technology. In this work, we explore different photoanode structures based on electrodeposited BiVO4 onto transparent FTO substrates to achieve a more efficient PEC reduction of CO2. Among the tested structures, the photoanode incorporating a Bi2O3 underlayer, which enhances the BiVO4-FTO interface by reducing electron-hole recombination, exhibits the best PEC performance. Integrating this photoanode into a CO2 photoelectrolyzer with back visible light illumination achieves an impressive current density of −29 mA cm−2 at constant −1.8 V (vs. Ag/AgCl). Using a Bi/C GDE as the cathode, the system produces up to 56.2 g L−1 of formate with a Faradaic efficiency of 96 %. In terms of energy performance, illuminating the photoanode reduces energy consumption by nearly 40 %, bringing it down to 317 kWh kmol−1, with an energy efficiency of 38 %. The external bias can be further decreased by increasing the irradiation intensity to 2.5 suns using concentrated solar light, resulting in an additional 10 % reduction in energy consumption (290 kWh kmol−1), while maintaining high conversion efficiencies for CO2 to formate (over 95 % Faradaic efficiency). Besides, energy efficiency improves by 12 %, as the cathodic potential is reduced to −1.65 V (vs. Ag/AgCl). These results represent significant progress in reducing the external bias required for CO2 to formate conversion in PEC systems, marking a step toward the industrial application of CO2 conversion technology.Elsevier B.V.2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/222064Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.cej.2025.163348Chemical Engineering Journal, 2025, vol. 514https://doi.org/10.1016/j.cej.2025.163348cc-by-nc-nd (c) Elsevier B.V., 2025http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2220642026-05-27T06:46:51Z
dc.title.none.fl_str_mv Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
title Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
spellingShingle Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
Abarca, José Antonio
Electroquímica
Bismut
Fotònica
Electrochemistry
Bismuth
Photonics
title_short Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
title_full Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
title_fullStr Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
title_full_unstemmed Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
title_sort Electrodeposited BiVO4-based photoanodes for an energy-efficient photo-assisted CO2-to-formate conversion
dc.creator.none.fl_str_mv Abarca, José Antonio
Molera Janer, Martí
Merino-García, Ivan
Díaz-Sainz, Guillermo
Irabien, Angel
Solla-Gullón, José
Fàbrega Gallego, Cristian
Andreu Arbella, Teresa
Albo, Jonathan
author Abarca, José Antonio
author_facet Abarca, José Antonio
Molera Janer, Martí
Merino-García, Ivan
Díaz-Sainz, Guillermo
Irabien, Angel
Solla-Gullón, José
Fàbrega Gallego, Cristian
Andreu Arbella, Teresa
Albo, Jonathan
author_role author
author2 Molera Janer, Martí
Merino-García, Ivan
Díaz-Sainz, Guillermo
Irabien, Angel
Solla-Gullón, José
Fàbrega Gallego, Cristian
Andreu Arbella, Teresa
Albo, Jonathan
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Electroquímica
Bismut
Fotònica
Electrochemistry
Bismuth
Photonics
topic Electroquímica
Bismut
Fotònica
Electrochemistry
Bismuth
Photonics
description The development of efficient photoanodes that reduce external energy requirements for the electrochemical conversion of CO2 to formate is essential for the future implementation of this technology. In this work, we explore different photoanode structures based on electrodeposited BiVO4 onto transparent FTO substrates to achieve a more efficient PEC reduction of CO2. Among the tested structures, the photoanode incorporating a Bi2O3 underlayer, which enhances the BiVO4-FTO interface by reducing electron-hole recombination, exhibits the best PEC performance. Integrating this photoanode into a CO2 photoelectrolyzer with back visible light illumination achieves an impressive current density of −29 mA cm−2 at constant −1.8 V (vs. Ag/AgCl). Using a Bi/C GDE as the cathode, the system produces up to 56.2 g L−1 of formate with a Faradaic efficiency of 96 %. In terms of energy performance, illuminating the photoanode reduces energy consumption by nearly 40 %, bringing it down to 317 kWh kmol−1, with an energy efficiency of 38 %. The external bias can be further decreased by increasing the irradiation intensity to 2.5 suns using concentrated solar light, resulting in an additional 10 % reduction in energy consumption (290 kWh kmol−1), while maintaining high conversion efficiencies for CO2 to formate (over 95 % Faradaic efficiency). Besides, energy efficiency improves by 12 %, as the cathodic potential is reduced to −1.65 V (vs. Ag/AgCl). These results represent significant progress in reducing the external bias required for CO2 to formate conversion in PEC systems, marking a step toward the industrial application of CO2 conversion technology.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/222064
url https://hdl.handle.net/2445/222064
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.cej.2025.163348
Chemical Engineering Journal, 2025, vol. 514
https://doi.org/10.1016/j.cej.2025.163348
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2025
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier B.V., 2025
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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