Novel perovskite materials for thermal water splitting at moderate temperature

Materials with the formula Sr_2CoNb_1-xTi_xO_(6-delta) (x=1.00, 0.70; delta=number of oxygen vacancies) present a cubic perovskite-like structure. They are easily and reversibly reduced in N_2 or Ar and re-oxidized in air upon heating. Oxidation by water (wet N_2), involving splitting of water at a...

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Authors: Azcondo, M. Teresa, Orfila, María, Marugán, Javier, Sanz Martín, Raúl, Muñoz Noval, Álvaro, Salas Colera, Eduardo, Ritter, Clemens, García Alvarado, Flaviano, Amador, Ulises
Format: article
Publication Date:2019
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/13665
Online Access:https://hdl.handle.net/20.500.14352/13665
Access Level:Open access
Keyword:538.9
Ray-absorption spectroscopy
Solar thermochemical h-2
Equal-to 0.5
Hydrogen-production
Redox-pair
Oxides
Stability
Cathode
Cycles
Edge
Hydrogen generation
Perovskite phases
Solar fuel
Thermochemical cycle
Water splitting
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
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oai_identifier_str oai:docta.ucm.es:20.500.14352/13665
network_acronym_str ES
network_name_str España
repository_id_str
spelling Novel perovskite materials for thermal water splitting at moderate temperatureAzcondo, M. TeresaOrfila, MaríaMarugán, JavierSanz Martín, RaúlMuñoz Noval, ÁlvaroSalas Colera, EduardoRitter, ClemensGarcía Alvarado, FlavianoAmador, Ulises538.9Ray-absorption spectroscopySolar thermochemical h-2Equal-to 0.5Hydrogen-productionRedox-pairOxidesStabilityCathodeCyclesEdgeHydrogen generationPerovskite phasesSolar fuelThermochemical cycleWater splittingFísica de materialesFísica del estado sólido2211 Física del Estado SólidoMaterials with the formula Sr_2CoNb_1-xTi_xO_(6-delta) (x=1.00, 0.70; delta=number of oxygen vacancies) present a cubic perovskite-like structure. They are easily and reversibly reduced in N_2 or Ar and re-oxidized in air upon heating. Oxidation by water (wet N_2), involving splitting of water at a temperature as low as 700 ºC, produces hydrogen. Both compounds displayed outstanding H_2 production in the first thermochemical cycle, the Sr_2CoNb_(0.30)Ti_(0.70)O_(6-delta) material retaining its outstanding performance upon cycling, whereas the hydrogen yield of the x=1 oxide showed a continuous decay. The retention of the materials' ability to promote water splitting correlated with their structural, chemical, and redox reversibility upon cycling. On reduction/oxidation, Co ions reversibly changed their oxidation state to compensate the release/recovery of oxygen in both compounds. However, in Sr_2CoTiO_(6-delta), two phases with different oxygen contents segregated, whereas in Sr_2CoNb_(0.30)Ti_(0.70)O_(6-delta) this effect was not evident. Therefore, this latter material displayed a hydrogen production as high as 410 mu molH_2/g_(perovskite) after eight thermochemical cycles at 700 ºC, which is among the highest ever reported, making this perovskite a promising candidate for thermosolar water splitting in real devices.Wiley-V C H VERLAG GMBHUniversidad Complutense de Madrid20192019-07-0820192019-07-08journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/13665reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/136652026-06-02T12:44:21Z
dc.title.none.fl_str_mv Novel perovskite materials for thermal water splitting at moderate temperature
title Novel perovskite materials for thermal water splitting at moderate temperature
spellingShingle Novel perovskite materials for thermal water splitting at moderate temperature
Azcondo, M. Teresa
538.9
Ray-absorption spectroscopy
Solar thermochemical h-2
Equal-to 0.5
Hydrogen-production
Redox-pair
Oxides
Stability
Cathode
Cycles
Edge
Hydrogen generation
Perovskite phases
Solar fuel
Thermochemical cycle
Water splitting
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
title_short Novel perovskite materials for thermal water splitting at moderate temperature
title_full Novel perovskite materials for thermal water splitting at moderate temperature
title_fullStr Novel perovskite materials for thermal water splitting at moderate temperature
title_full_unstemmed Novel perovskite materials for thermal water splitting at moderate temperature
title_sort Novel perovskite materials for thermal water splitting at moderate temperature
dc.creator.none.fl_str_mv Azcondo, M. Teresa
Orfila, María
Marugán, Javier
Sanz Martín, Raúl
Muñoz Noval, Álvaro
Salas Colera, Eduardo
Ritter, Clemens
García Alvarado, Flaviano
Amador, Ulises
author Azcondo, M. Teresa
author_facet Azcondo, M. Teresa
Orfila, María
Marugán, Javier
Sanz Martín, Raúl
Muñoz Noval, Álvaro
Salas Colera, Eduardo
Ritter, Clemens
García Alvarado, Flaviano
Amador, Ulises
author_role author
author2 Orfila, María
Marugán, Javier
Sanz Martín, Raúl
Muñoz Noval, Álvaro
Salas Colera, Eduardo
Ritter, Clemens
García Alvarado, Flaviano
Amador, Ulises
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 538.9
Ray-absorption spectroscopy
Solar thermochemical h-2
Equal-to 0.5
Hydrogen-production
Redox-pair
Oxides
Stability
Cathode
Cycles
Edge
Hydrogen generation
Perovskite phases
Solar fuel
Thermochemical cycle
Water splitting
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
topic 538.9
Ray-absorption spectroscopy
Solar thermochemical h-2
Equal-to 0.5
Hydrogen-production
Redox-pair
Oxides
Stability
Cathode
Cycles
Edge
Hydrogen generation
Perovskite phases
Solar fuel
Thermochemical cycle
Water splitting
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
description Materials with the formula Sr_2CoNb_1-xTi_xO_(6-delta) (x=1.00, 0.70; delta=number of oxygen vacancies) present a cubic perovskite-like structure. They are easily and reversibly reduced in N_2 or Ar and re-oxidized in air upon heating. Oxidation by water (wet N_2), involving splitting of water at a temperature as low as 700 ºC, produces hydrogen. Both compounds displayed outstanding H_2 production in the first thermochemical cycle, the Sr_2CoNb_(0.30)Ti_(0.70)O_(6-delta) material retaining its outstanding performance upon cycling, whereas the hydrogen yield of the x=1 oxide showed a continuous decay. The retention of the materials' ability to promote water splitting correlated with their structural, chemical, and redox reversibility upon cycling. On reduction/oxidation, Co ions reversibly changed their oxidation state to compensate the release/recovery of oxygen in both compounds. However, in Sr_2CoTiO_(6-delta), two phases with different oxygen contents segregated, whereas in Sr_2CoNb_(0.30)Ti_(0.70)O_(6-delta) this effect was not evident. Therefore, this latter material displayed a hydrogen production as high as 410 mu molH_2/g_(perovskite) after eight thermochemical cycles at 700 ºC, which is among the highest ever reported, making this perovskite a promising candidate for thermosolar water splitting in real devices.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-07-08
2019
2019-07-08
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/13665
url https://hdl.handle.net/20.500.14352/13665
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 Wiley-V C H VERLAG GMBH
publisher.none.fl_str_mv Wiley-V C H VERLAG GMBH
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
_version_ 1869422038616113152
score 15.300719

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