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dc.date.accessioned2020-02-17T19:31:19Z
dc.date.available2020-02-17T19:31:19Z
dc.date.created2019-02-05T15:42:05Z
dc.date.issued2019
dc.identifier.citationKumar, Susmit Waller, David Fjellvåg, Helmer Sjåstad, Anja Olafsen . Development of custom made bimetallic alloy model systems based on platinum-rhodium for heterogeneous catalysis. Journal of Alloys and Compounds. 2019
dc.identifier.urihttp://hdl.handle.net/10852/73124
dc.description.abstractThe current study extends the insight into solid-state diffusion in alloys of the Platinum Group Metals (PGMs). Thereby, we pave the way for tailor making surface compositions of binary platinum (Pt) – rhodium (Rh) model catalysts, with deposited rhodium layers on the surface of Pt single crystals (SCs) as the starting point. Platinum single crystals with (100), (110) and (111) orientations were studied by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In addition, X-ray Photoelectron spectroscopy (XPS) characterization was carried out on Pt(110). The crystallographic orientation has a prominent effect on diffusion characteristics. The slowest moving Kirkendall – plane was observed for Pt(110) at xK = 250 nm from reference point x0, while, the fastest for Pt(100) was at xK = 450 nm, indicating that the inter-diffusion rate with respect to orientation increases in the sequence Pt(110) < Pt(111) < Pt(100). The diffusion coefficient of Rh into Pt is of the order ~ 1017 – 1018 m2/s, whereas it was slightly less than ~ 1019 m2/s for Pt into Rh; albeit comparable to the vacancy diffusion rate from Pt into Rh. Our experimental findings show good agreement with calculated inter-diffusion coefficients using Darken analysis. A theoretical direction is proposed for improved fitting of data.
dc.languageEN
dc.publisherElsevier Science
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleDevelopment of custom made bimetallic alloy model systems based on platinum-rhodium for heterogeneous catalysis
dc.typeJournal article
dc.creator.authorKumar, Susmit
dc.creator.authorWaller, David
dc.creator.authorFjellvåg, Helmer
dc.creator.authorSjåstad, Anja Olafsen
cristin.unitcode185,15,17,10
cristin.unitnameSenter for Materialvitenskap og Nanoteknologi kjemi
cristin.ispublishedfalse
cristin.fulltextpostprint
cristin.qualitycode1
dc.identifier.cristin1673754
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Alloys and Compounds&rft.volume=&rft.spage=&rft.date=2019
dc.identifier.jtitleJournal of Alloys and Compounds
dc.identifier.volume786
dc.identifier.startpage1021
dc.identifier.endpage1029
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2019.02.026
dc.identifier.urnURN:NBN:no-76252
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0925-8388
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/73124/4/1-s2.0-S0925838819304608-main.pdf
dc.type.versionPublishedVersion
dc.relation.projectNFR/215461/E30
dc.relation.projectNFR/237922


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