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dc.contributor.authorBau, Jeremy
dc.contributor.authorHaspel, Henrik
dc.contributor.authorOuld-Chikh, Samy
dc.contributor.authorAguilar-Tapia, Antonio
dc.contributor.authorHazemann, Jean-Louis
dc.contributor.authorIdriss, Hicham
dc.contributor.authorTakanabe, Kazuhiro
dc.date.accessioned2019-07-10T12:19:22Z
dc.date.available2019-07-10T12:19:22Z
dc.date.issued2019
dc.identifier.citationBau, J. A., Haspel, H., Ould-Chikh, S., Aguilar-Tapia, A., Hazemann, J.-L., Idriss, H., & Takanabe, K. (2019). On the reconstruction of NiMo electrocatalysts by operando spectroscopy. Journal of Materials Chemistry A, 7(25), 15031–15035. doi:10.1039/c9ta04494a
dc.identifier.doi10.1039/c9ta04494a
dc.identifier.urihttp://hdl.handle.net/10754/655966
dc.description.abstractOperando spectroscopy is critical for the understanding of electrocatalytic reactions. The structural dynamics of NiMo, one of the most active non-precious catalysts for the H2 evolution reaction (HER) under alkaline conditions, were studied by X-ray absorption spectroscopy (XAS) and Raman spectroscopy. We observed considerably unexpected results, some of which may change the way we look at data interpretation. Under operando HER conditions under XAS or visible-light laser irradiation, trace amounts of Mo ions were liberated and then redeposited on the electrodes as a Mo4+-containing oxide, giving the appearance that the HER-active catalyst is in the oxide phase. The Mo oxide self-propagated under sufficiently energetic light, resulting in a pattern matching the irradiated catalyst area. Detailed spectroscopic characterization of the role of Mo in NiMo may be hindered under operando conditions and care needs to be taken to avoid misleading data interpretation.
dc.description.sponsorshipThe research reported in this study was supported by the King Abdullah University of Science and Technology. The authors acknowledge the support of SABIC in funding this research. The FAME-UHD project is financially supported by the French large loan EquipEx (EcoX, ANR-10-EQPX-27-01), the CEA-CNRS CRG consortium and the INSU CNRS Institute.
dc.publisherRoyal Society of Chemistry (RSC)
dc.relation.urlhttp://xlink.rsc.org/?DOI=C9TA04494A
dc.rightsArchived with thanks to Journal of Materials Chemistry A
dc.titleOn the reconstruction of NiMo electrocatalysts by operando spectroscopy
dc.typeArticle
dc.contributor.departmentCatalysis for Energy Conversion (CatEC)
dc.contributor.departmentCentre for Research and Development, Saudi Arabian Basic Industries Corporation, KAUST, Saudi Arabia
dc.contributor.departmentChemical Science
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Catalysis Center
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Materials Chemistry A
dc.rights.embargodate2020-07-10
dc.eprint.versionPost-print
dc.contributor.institutionInstitut Néel, UPR2940, CNRS, University of Grenoble Alpes, F-38000 Grenoble, France
dc.contributor.institutionDepartment of Chemical Systems Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Japan
kaust.personBau, Jeremy
kaust.personHaspel, Henrik
kaust.personOuld-Chikh, Samy
kaust.personIdriss, Hicham
kaust.personTakanabe, Kazuhiro
refterms.dateFOA2019-07-11T06:49:17Z


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