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dc.creatorPasquini, Chiara
dc.creatorLiu, Si
dc.creatorChernev, Petko
dc.creatorGonzález Flores, Diego
dc.creatorMohammadi, Mohammad Reza
dc.creatorKubella, Paul
dc.creatorJiang, Shan
dc.creatorLoos, Stefan
dc.creatorKlingan, Katharina
dc.creatorSikolenko, Vadim V.
dc.creatorMebs, Stefan
dc.creatorHaumann, Michael
dc.creatorBeyer, Paul
dc.creatorD’Amario, Luca
dc.creatorSmith, Rodney D.L.
dc.creatorZaharieva, Ivelina
dc.creatorDau, Holger
dc.date.accessioned2022-07-22T20:08:33Z
dc.date.available2022-07-22T20:08:33Z
dc.date.issued2021
dc.identifier.citationhttps://link.springer.com/article/10.1007/s00216-021-03515-0es_ES
dc.identifier.issn1618-2650
dc.identifier.urihttps://hdl.handle.net/10669/87034
dc.description.abstractTransition metal oxides are promising electrocatalysts for water oxidation, i.e., the oxygen evolution reaction (OER), which is critical in electrochemical production of non-fossil fuels. The involvement of oxidation state changes of the metal in OER electrocatalysis is increasingly recognized in the literature. Tracing these oxidation states under operation conditions could provide relevant information for performance optimization and development of durable catalysts, but further methodical developments are needed. Here, we propose a strategy to use single-energy X-ray absorption spectroscopy for monitoring metal oxidation-state changes during OER operation with millisecond time resolution. The procedure to obtain time-resolved oxidation state values, using two calibration curves, is explained in detail. We demonstrate the significance of this approach as well as possible sources of data misinterpretation. We conclude that the combination of X-ray absorption spectroscopy with electrochemical techniques allows us to investigate the kinetics of redox transitions and to distinguish the catalytic current from the redox current. Tracking of the oxidation state changes of Co ions in electrodeposited oxide films during cyclic voltammetry in neutral pH electrolyte serves as a proof of principle.es_ES
dc.description.sponsorshipOpen access funding enabled and organized by Projekt DEAL. The implementation of the operando XAS experiments was financially supported by the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF) under grants 05K16KE2 (IN-SITU-XAS) and 05K19KE1 (OPERANDO-XAS). This project was also funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC 2008 – 390540038 – UniSysCat. We thank the Alexander-von-Humboldt (AvH) Foundation for a postdoctoral fellowship awarded to R.D.L.S. and the Chinese Scholarship Council (CSC) for supporting S.J. and S.L. by PhD fellowshipses_ES
dc.language.isoenges_ES
dc.sourceAnalytical and Bioanalytical Chemistry, 413, p. 5395–5408es_ES
dc.subjectElectrocatalystses_ES
dc.subjectTime-resolvedX-ray absorption spectroscopyes_ES
dc.subjectTransition metal oxideses_ES
dc.subjectWater oxidationes_ES
dc.titleOperando tracking of oxidation-state changes by coupling electrochemistry with time-resolved X-ray absorption spectroscopy demonstrated for water oxidation by a cobalt-based catalysts filmes_ES
dc.typeartículo científicoes_ES
dc.identifier.doihttps://doi.org/10.1007/s00216-021-03515-0
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 Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Químicaes_ES


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