Kinetics, Energetics, and Size Dependence of the Transformation from Pt to Ordered PtSn Intermetallic Nanoparticles

dc.contributor.author Chen, Minda
dc.contributor.author Han, Yong
dc.contributor.author Goh, Tian Wei
dc.contributor.author Sun, Rong
dc.contributor.author Maligal‐Ganesh, Raghu
dc.contributor.author Pei, Yuchen
dc.contributor.author Evans, James
dc.contributor.author Tsung, Chia‐ Kuang
dc.contributor.author Huang, Wenyu
dc.contributor.department Ames National Laboratory
dc.contributor.department Physics and Astronomy
dc.contributor.department Chemistry
dc.date 2019-08-18T08:23:42.000
dc.date.accessioned 2020-06-30T01:16:40Z
dc.date.available 2020-06-30T01:16:40Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.issued 2019-01-01
dc.description.abstract <p>The outstanding catalytic activity and chemical selectivity of intermetallic compounds make them excellent candidates for heterogeneous catalysis. However, the kinetics of their formation at the nanoscale is poorly understood or characterized, and precise control of their size, shape as well as composition during synthesis remains challenging. Here, using well-defined Pt nanoparticles (5 nm and 14 nm) encapsulated in mesoporous silica, we study the transformation kinetics from monometallic Pt to intermetallic PtSn at different temperatures by a series of time-evolution X-ray diffraction studies. Observations indicate an initial transformation stage mediated by Pt surface-controlled intermixing kinetics, followed by a second stage with distinct transformation kinetics corresponding to a Ginstling-Brounstein (G-B) type bulk diffusion mode. Moreover, the activation barrier for both surface intermixing and diffusion stages are obtained through the development of appropriate kinetic models for analysis of experimental data. Our density-functional-theory (DFT) calculations provide further insights into the atomistic-level processes and associated energetics underlying surface-controlled intermixing.</p>
dc.description.comments <p>This is article is published as Chen, Minda, Yong Han, Tian Wei Goh, Rong Sun, Raghu V. Maligal-Ganesh, Yuchen Pei, Chia-Kuang Frank Tsung, James Evans, and Wenyu Huang. "Kinetics, Energetics, and Size Dependence of the Transformation from Pt to Ordered PtSn Intermetallic Nanoparticles." <em>Nanoscale</em> 11 (2019): 5336. DOI: <a href="http://dx.doi.org/10.1039/C8NR10067E" target="_blank">10.1039/C8NR10067E</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/chem_pubs/1106/
dc.identifier.articleid 2109
dc.identifier.contextkey 13934511
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath chem_pubs/1106
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/14408
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/chem_pubs/1106/2019_HuangWenyu_KineticsEnergetics.pdf|||Fri Mar 08 17:48:32 UTC 2019
dc.source.bitstream archive/lib.dr.iastate.edu/chem_pubs/1106/2019_HuangWenyu_KineticsEnergeticsSize.pdf|||Fri Jan 14 18:41:21 UTC 2022
dc.source.uri 10.1039/C8NR10067E
dc.subject.disciplines Biological and Chemical Physics
dc.subject.disciplines Materials Chemistry
dc.subject.disciplines Nanoscience and Nanotechnology
dc.title Kinetics, Energetics, and Size Dependence of the Transformation from Pt to Ordered PtSn Intermetallic Nanoparticles
dc.type article
dc.type.genre article
dspace.entity.type Publication
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