How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites

In view of iridium's scarceness and high cost, Ir-containing catalysts for water electrolyzers should have low loadings and maximal utilization. Here, we studied low-Ir-content, highly active, double perovskites (Sr2MIrO6, M = Ni, Co, Sc and Fe) for the oxygen evolution reaction (OER) in acid c...

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Autores: Retuerto, Maria, Pascual, Laura, Pique, Oriol, Kayser González, Paula, Abdel Salam, Mohamed, Mokhtar, Mohamed, Alonso, Jose Antonio, Peña, Miguel, Calle-Vallejo, Federico, Rojas, Sergio
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/92542
Acceso en línea:https://hdl.handle.net/20.500.14352/92542
Access Level:acceso abierto
Palabra clave:546
Electrocatalysts
Iridium
Oxygen
Oxygen evolution reaction
Perovskite
Ciencias
23 Química
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oai_identifier_str oai:docta.ucm.es:20.500.14352/92542
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repository_id_str
spelling How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskitesRetuerto, MariaPascual, LauraPique, OriolKayser González, PaulaAbdel Salam, MohamedMokhtar, MohamedAlonso, Jose AntonioPeña, MiguelCalle-Vallejo, FedericoRojas, Sergio546ElectrocatalystsIridiumOxygenOxygen evolution reactionPerovskiteCiencias23 QuímicaIn view of iridium's scarceness and high cost, Ir-containing catalysts for water electrolyzers should have low loadings and maximal utilization. Here, we studied low-Ir-content, highly active, double perovskites (Sr2MIrO6, M = Ni, Co, Sc and Fe) for the oxygen evolution reaction (OER) in acid combining electrochemical experiments, DFT, and advanced characterization techniques. The initial OER performance depends on Ir's oxidation state and the geometric features of IrO6 frameworks, which are tuned by the choice of M. Higher oxidation states, particularly Ir6+, enhance the OER activity: Sr2NiIrO6 and Sr2CoIrO6 display potentials of ∼1.53 V at 10 mA cm−2, comparable to the best Ir-based catalysts in the literature. However, because of their less symmetric structures, perovskites with Ir6+ are less stable, prone to surface reconstruction and their cations leach under OER conditions. These results show that improved iridium-based OER electrocatalysts in acid can be designed by balancing their activity and stability.Royal Society of ChemistryUniversidad Complutense de Madrid20212021-01-0120212021-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/92542reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/925422026-06-02T12:44:21Z
dc.title.none.fl_str_mv How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
title How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
spellingShingle How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
Retuerto, Maria
546
Electrocatalysts
Iridium
Oxygen
Oxygen evolution reaction
Perovskite
Ciencias
23 Química
title_short How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
title_full How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
title_fullStr How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
title_full_unstemmed How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
title_sort How oxidation state and lattice distortion influence the oxygen evolution activity in acid of iridium double perovskites
dc.creator.none.fl_str_mv Retuerto, Maria
Pascual, Laura
Pique, Oriol
Kayser González, Paula
Abdel Salam, Mohamed
Mokhtar, Mohamed
Alonso, Jose Antonio
Peña, Miguel
Calle-Vallejo, Federico
Rojas, Sergio
author Retuerto, Maria
author_facet Retuerto, Maria
Pascual, Laura
Pique, Oriol
Kayser González, Paula
Abdel Salam, Mohamed
Mokhtar, Mohamed
Alonso, Jose Antonio
Peña, Miguel
Calle-Vallejo, Federico
Rojas, Sergio
author_role author
author2 Pascual, Laura
Pique, Oriol
Kayser González, Paula
Abdel Salam, Mohamed
Mokhtar, Mohamed
Alonso, Jose Antonio
Peña, Miguel
Calle-Vallejo, Federico
Rojas, Sergio
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 546
Electrocatalysts
Iridium
Oxygen
Oxygen evolution reaction
Perovskite
Ciencias
23 Química
topic 546
Electrocatalysts
Iridium
Oxygen
Oxygen evolution reaction
Perovskite
Ciencias
23 Química
description In view of iridium's scarceness and high cost, Ir-containing catalysts for water electrolyzers should have low loadings and maximal utilization. Here, we studied low-Ir-content, highly active, double perovskites (Sr2MIrO6, M = Ni, Co, Sc and Fe) for the oxygen evolution reaction (OER) in acid combining electrochemical experiments, DFT, and advanced characterization techniques. The initial OER performance depends on Ir's oxidation state and the geometric features of IrO6 frameworks, which are tuned by the choice of M. Higher oxidation states, particularly Ir6+, enhance the OER activity: Sr2NiIrO6 and Sr2CoIrO6 display potentials of ∼1.53 V at 10 mA cm−2, comparable to the best Ir-based catalysts in the literature. However, because of their less symmetric structures, perovskites with Ir6+ are less stable, prone to surface reconstruction and their cations leach under OER conditions. These results show that improved iridium-based OER electrocatalysts in acid can be designed by balancing their activity and stability.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-01-01
2021
2021-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/92542
url https://hdl.handle.net/20.500.14352/92542
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.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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