Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution

Hydrogen, produced by water splitting, has been proposed as one of the main green energy vectors of the future if produced from renewable energy sources. However, to substitute fossil fuels, large amounts of pure water are necessary, scarce in many world regions. In this work, we fabricate efficient...

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Autores: Murcia López, Sebastián|||0000-0002-3703-041X, García de Andrés, Xènia|||0000-0003-0795-4168, Rosado, M, Llorca Piqué, Jordi|||0000-0002-7447-9582, Morante Lleonart, Joan Ramon|||0000-0002-4981-4633
Tipo de documento: artigo
Data de publicação:2021
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositório:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglês
OAI Identifier:oai:upcommons.upc.edu:2117/351143
Acesso em linha:https://hdl.handle.net/2117/351143
https://dx.doi.org/10.1002/cssc.202100194
Access Level:Acceso aberto
Palavra-chave:Electrocatalysis
Green chemistry
Electrocatàlisi
Química verda
Àrees temàtiques de la UPC::Enginyeria química::Impacte ambiental
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repository_id_str
spelling Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolutionMurcia López, Sebastián|||0000-0002-3703-041XGarcía de Andrés, Xènia|||0000-0003-0795-4168Rosado, MLlorca Piqué, Jordi|||0000-0002-7447-9582Morante Lleonart, Joan Ramon|||0000-0002-4981-4633ElectrocatalysisGreen chemistryElectrocatàlisiQuímica verdaÀrees temàtiques de la UPC::Enginyeria química::Impacte ambientalHydrogen, produced by water splitting, has been proposed as one of the main green energy vectors of the future if produced from renewable energy sources. However, to substitute fossil fuels, large amounts of pure water are necessary, scarce in many world regions. In this work, we fabricate efficient and earth-abundant electrodes, study the challenges of using real seawater, and propose an electrode regeneration method to face undesired salt deposition. Ni-Mo-Fe trimetallic electrocatalyst is deposited on non-expensive graphitic carbon felts both for hydrogen (HER) and oxygen evolution reactions (OER) in seawater and alkaline seawater. Cl- pitting and the chlorine oxidation reaction are suppressed on these substrates and alkalinized electrolyte. Precipitations on the electrodes, mainly CaCO3, originating from seawater-dissolved components have been studied, and a simple regeneration technique is proposed to rapidly dissolve undesired deposited CaCO3 in acidified seawater. Under alkaline conditions, Ni-Mo-Fe-based catalyst is found to reconfigure, under cathodic bias, into Ni-Mo-Fe alloy with a cubic crystalline structure and Ni¿:¿Fe(OH)2 redeposits whereas, under anodic bias, it is transformed into a follicular Ni:FeOOH structure. High productivities over 300 mA¿cm-2 and voltages down to 1.59 V@10 mA¿cm-2 for the overall water splitting reaction have been shown, and electrodes are found stable for over 24 h without decay in alkaline seawater conditions and with energy efficiency higher than 61.5¿% which makes seawater splitting promising and economically feasible. Supporting InformationPeer Reviewed20212021-07-2220212021-09-13journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/351143https://dx.doi.org/10.1002/cssc.202100194reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3511432026-05-27T15:37:01Z
dc.title.none.fl_str_mv Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
title Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
spellingShingle Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
Murcia López, Sebastián|||0000-0002-3703-041X
Electrocatalysis
Green chemistry
Electrocatàlisi
Química verda
Àrees temàtiques de la UPC::Enginyeria química::Impacte ambiental
title_short Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
title_full Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
title_fullStr Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
title_full_unstemmed Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
title_sort Facing seawater splitting challenges by regeneration with Ni-Mo-Fe bifunctional electrocatalyst for hydrogen and oxygen evolution
dc.creator.none.fl_str_mv Murcia López, Sebastián|||0000-0002-3703-041X
García de Andrés, Xènia|||0000-0003-0795-4168
Rosado, M
Llorca Piqué, Jordi|||0000-0002-7447-9582
Morante Lleonart, Joan Ramon|||0000-0002-4981-4633
author Murcia López, Sebastián|||0000-0002-3703-041X
author_facet Murcia López, Sebastián|||0000-0002-3703-041X
García de Andrés, Xènia|||0000-0003-0795-4168
Rosado, M
Llorca Piqué, Jordi|||0000-0002-7447-9582
Morante Lleonart, Joan Ramon|||0000-0002-4981-4633
author_role author
author2 García de Andrés, Xènia|||0000-0003-0795-4168
Rosado, M
Llorca Piqué, Jordi|||0000-0002-7447-9582
Morante Lleonart, Joan Ramon|||0000-0002-4981-4633
author2_role author
author
author
author
dc.subject.none.fl_str_mv Electrocatalysis
Green chemistry
Electrocatàlisi
Química verda
Àrees temàtiques de la UPC::Enginyeria química::Impacte ambiental
topic Electrocatalysis
Green chemistry
Electrocatàlisi
Química verda
Àrees temàtiques de la UPC::Enginyeria química::Impacte ambiental
description Hydrogen, produced by water splitting, has been proposed as one of the main green energy vectors of the future if produced from renewable energy sources. However, to substitute fossil fuels, large amounts of pure water are necessary, scarce in many world regions. In this work, we fabricate efficient and earth-abundant electrodes, study the challenges of using real seawater, and propose an electrode regeneration method to face undesired salt deposition. Ni-Mo-Fe trimetallic electrocatalyst is deposited on non-expensive graphitic carbon felts both for hydrogen (HER) and oxygen evolution reactions (OER) in seawater and alkaline seawater. Cl- pitting and the chlorine oxidation reaction are suppressed on these substrates and alkalinized electrolyte. Precipitations on the electrodes, mainly CaCO3, originating from seawater-dissolved components have been studied, and a simple regeneration technique is proposed to rapidly dissolve undesired deposited CaCO3 in acidified seawater. Under alkaline conditions, Ni-Mo-Fe-based catalyst is found to reconfigure, under cathodic bias, into Ni-Mo-Fe alloy with a cubic crystalline structure and Ni¿:¿Fe(OH)2 redeposits whereas, under anodic bias, it is transformed into a follicular Ni:FeOOH structure. High productivities over 300 mA¿cm-2 and voltages down to 1.59 V@10 mA¿cm-2 for the overall water splitting reaction have been shown, and electrodes are found stable for over 24 h without decay in alkaline seawater conditions and with energy efficiency higher than 61.5¿% which makes seawater splitting promising and economically feasible. Supporting Information
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-07-22
2021
2021-09-13
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/351143
https://dx.doi.org/10.1002/cssc.202100194
url https://hdl.handle.net/2117/351143
https://dx.doi.org/10.1002/cssc.202100194
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
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
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
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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