Show simple item record

dc.creatorVillalobos Porras, Javier
dc.creatorGonzález Flores, Diego
dc.creatorKlingan, Katharina
dc.creatorChernev, Petko
dc.creatorKubella, Paul
dc.creatorUrcuyo, Roberto
dc.creatorPasquini, Chiara
dc.creatorMohammadi, Mohammad Reza
dc.creatorSmith, Rodney D.L.
dc.creatorMontero Villalobos, Mavis Lili
dc.creatorDau, Holger
dc.date.accessioned2020-03-10T15:23:35Z
dc.date.available2020-03-10T15:23:35Z
dc.date.issued2019
dc.identifier.citationhttps://pubs.rsc.org/en/content/articlelanding/2019/cp/c9cp01754b#!divAbstractes_ES
dc.identifier.issn1463-9076
dc.identifier.issn1463-9084
dc.identifier.urihttp://hdl.handle.net/10669/80704
dc.description.abstractDirect (photo)electrochemical production of non-fossil fuels from water and CO2 requires water-oxidation catalysis at near-neutral pH in the presence of appropriate anions that serve as proton acceptors. We investigate the largely enigmatic structural role of anions in water oxidation for the prominent cobalt-phosphate catalyst (CoCat), an amorphous and hydrated oxide material. Co3([(P/As)O]4)2·8H2O served, in conjunction with phosphate–arsenate exchange, as a synthetic model system. Its structural transformation was induced by prolonged operation at catalytic potentials and probed by X-ray absorption spectroscopy not only at the metal (Co), but for the first time also at the anion (As) K-edge. For initially isostructural microcrystals, anion exchange determined the amorphization process and final structure. Comparison to amorphous electrodeposited Co oxide revealed that in CoCat, the arsenate binds not only at oxide-layer edges, but also arsenic substitutes cobalt positions within the layered-oxide structure in an unusual AsO6 coordination. Our results show that in water oxidation catalysis at near-neutral pH, anion type and exchange dynamics correlate with the catalyst structure and redox properties.es_ES
dc.description.sponsorshipUniversidad de Costa Rica/[]/UCR/Costa Ricaes_ES
dc.description.sponsorshipConsejo Nacional para Investigaciones Científicas y Tecnológicas/[]/CONICIT/Costa Ricaes_ES
dc.description.sponsorshipMinisterio de Ciencia, Tecnología y Telecomunicaciones/[]/MICITT/Costa Ricaes_ES
dc.description.sponsorshipGerman Federal Ministry of Education and Research/[]/BMBF/Alemaniaes_ES
dc.description.sponsorshipDeutsche Forschungsgemeinschaft/[]/DFG/Alemaniaes_ES
dc.language.isoen_USes_ES
dc.relation.ispartof
dc.sourcePhysical Chemistry Chemical Physics, vol.21(23), pp.12485-12493es_ES
dc.subjectCobalt-oxide materialses_ES
dc.subjectRole of anionses_ES
dc.subjectElectrochemical water oxidationes_ES
dc.titleStructural and functional role of anions in electrochemical water oxidation probed by arsenate incorporation into cobalt-oxide materialses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.date.updated2020-03-05T20:24:06Z
dc.identifier.doi10.1039/C9CP01754B
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Electroquímica y Energía Química (CELEQ)es_ES
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencia e Ingeniería de Materiales (CICIMA)es_ES


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record