Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex

Electrochemical water reduction by employing first‐row transition‐metal nanoparticles (NPs) constitutes a sustainable way for the generation of H2. We have synthesized Co‐based NPs from a molecular CoII/CoIII precursor after its reductive decomposition at –1.86 V versus NHE in different organic solv...

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Autores: Gil-Sepulcre, Marcos, Gimbert-Suriñach, Carolina, Aguilà, David, Velasco, Verónica, García-Antón, Jordi, Llobet, Antoni, Aromí, Guillem, Bofill, Roger, Sala, Xavier
Tipo de documento: artigo
Estado:Versión aceptada para publicación
Data de publicação:2018
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2072/334658
Acesso em linha:http://hdl.handle.net/2072/334658
https://doi.org/10.1002/ejic.201800033
Access Level:Acceso aberto
Palavra-chave:54
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spelling Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complexGil-Sepulcre, MarcosGimbert-Suriñach, CarolinaAguilà, DavidVelasco, VerónicaGarcía-Antón, JordiLlobet, AntoniAromí, GuillemBofill, RogerSala, Xavier54Electrochemical water reduction by employing first‐row transition‐metal nanoparticles (NPs) constitutes a sustainable way for the generation of H2. We have synthesized Co‐based NPs from a molecular CoII/CoIII precursor after its reductive decomposition at –1.86 V versus NHE in different organic solvents. These NPs are able to electrochemically reduce water at pH 14. SEM, EDX and XPS analyses have allowed the determination of the chemical nature of the as‐deposited NPs: CoO when using MeCN as the solvent and CoO(OH) when employing either dichloromethane (DCM) or MeOH. After 2 h of constant polarization at 10 mA cm–2, the electrocatalytic activity of the NPs obtained in MeCN and DCM decreases, whereas it increases for those obtained in MeOH. In this solvent, the overpotential is reduced by 215–220 mV and the specific current density is tripled. Interestingly, during this activation process in MeOH, the precursor CoO(OH) NPs are converted into Co(OH)2. The implications of these results in the context of the current research in the field are also discussed.Wiley2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion1499 p.application/pdfhttp://hdl.handle.net/2072/334658https://doi.org/10.1002/ejic.201800033RECERCAT (Dipòsit de la Recerca de Catalunya)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésEuropean Journal of Inorganix ChemistryL'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:2072/3346582026-05-29T05:05:01Z
dc.title.none.fl_str_mv Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
title Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
spellingShingle Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
Gil-Sepulcre, Marcos
54
title_short Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
title_full Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
title_fullStr Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
title_full_unstemmed Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
title_sort Catalytic H2 evolution with CoO, Co(OH)2 and CoO(OH) NPs generated from a molecular polynuclear Co complex
dc.creator.none.fl_str_mv Gil-Sepulcre, Marcos
Gimbert-Suriñach, Carolina
Aguilà, David
Velasco, Verónica
García-Antón, Jordi
Llobet, Antoni
Aromí, Guillem
Bofill, Roger
Sala, Xavier
author Gil-Sepulcre, Marcos
author_facet Gil-Sepulcre, Marcos
Gimbert-Suriñach, Carolina
Aguilà, David
Velasco, Verónica
García-Antón, Jordi
Llobet, Antoni
Aromí, Guillem
Bofill, Roger
Sala, Xavier
author_role author
author2 Gimbert-Suriñach, Carolina
Aguilà, David
Velasco, Verónica
García-Antón, Jordi
Llobet, Antoni
Aromí, Guillem
Bofill, Roger
Sala, Xavier
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv 54
topic 54
description Electrochemical water reduction by employing first‐row transition‐metal nanoparticles (NPs) constitutes a sustainable way for the generation of H2. We have synthesized Co‐based NPs from a molecular CoII/CoIII precursor after its reductive decomposition at –1.86 V versus NHE in different organic solvents. These NPs are able to electrochemically reduce water at pH 14. SEM, EDX and XPS analyses have allowed the determination of the chemical nature of the as‐deposited NPs: CoO when using MeCN as the solvent and CoO(OH) when employing either dichloromethane (DCM) or MeOH. After 2 h of constant polarization at 10 mA cm–2, the electrocatalytic activity of the NPs obtained in MeCN and DCM decreases, whereas it increases for those obtained in MeOH. In this solvent, the overpotential is reduced by 215–220 mV and the specific current density is tripled. Interestingly, during this activation process in MeOH, the precursor CoO(OH) NPs are converted into Co(OH)2. The implications of these results in the context of the current research in the field are also discussed.
publishDate 2018
dc.date.none.fl_str_mv 2018
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 http://hdl.handle.net/2072/334658
https://doi.org/10.1002/ejic.201800033
url http://hdl.handle.net/2072/334658
https://doi.org/10.1002/ejic.201800033
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv European Journal of Inorganix Chemistry
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1499 p.
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv RECERCAT (Dipòsit de la Recerca de Catalunya)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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