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Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode

Atomic hydrogen and oxygen adsorption on a platinum electrode in H /sub 2/SO/sub 4/ and HClO/sub 4/ electrolytes were studied by Pt L /sub 23/ XANES. The Pt electrode was formed of highly dispersed 1.5-3.0 nm particles supported on $9 carbon. A difference procedure utilizing the L/sub 2/ and L/sub 3...

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Detalles Bibliográficos
Autores principales: O'Grady, W E, Ramaker, D E
Lenguaje:eng
Publicado: 1999
Materias:
XX
Acceso en línea:https://dx.doi.org/10.1107/S0909049599000035
http://cds.cern.ch/record/409722
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author O'Grady, W E
Ramaker, D E
author_facet O'Grady, W E
Ramaker, D E
author_sort O'Grady, W E
collection CERN
description Atomic hydrogen and oxygen adsorption on a platinum electrode in H /sub 2/SO/sub 4/ and HClO/sub 4/ electrolytes were studied by Pt L /sub 23/ XANES. The Pt electrode was formed of highly dispersed 1.5-3.0 nm particles supported on $9 carbon. A difference procedure utilizing the L/sub 2/ and L/sub 3/ spectra at various applied voltages was used to isolate the electronic and geometric effects in the XANES spectra. At 0.54 V (relative to RHE) the Pt electrode in $9 HClO/sub 4/ is assumed to be "clean". By taking the difference between the spectra at 0.0 and 0.54 V, the Pt-H antibonding state (electronic effect) is isolated and found to have a Fano-resonance line shape. In addition, a $9 significant Pt-H EXAFS scattering (geometric effect) was found for photon energies 0 to 20 eV above the edge. The difference between the spectra at 1.14 and 0.54 V allows isolation of the Pt-O antibonding state and the Pt-O EXAFS $9 scattering. (7 refs).
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1999
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spelling cern-4097222019-09-30T06:29:59Zdoi:10.1107/S0909049599000035http://cds.cern.ch/record/409722engO'Grady, W ERamaker, D EShape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrodeXXAtomic hydrogen and oxygen adsorption on a platinum electrode in H /sub 2/SO/sub 4/ and HClO/sub 4/ electrolytes were studied by Pt L /sub 23/ XANES. The Pt electrode was formed of highly dispersed 1.5-3.0 nm particles supported on $9 carbon. A difference procedure utilizing the L/sub 2/ and L/sub 3/ spectra at various applied voltages was used to isolate the electronic and geometric effects in the XANES spectra. At 0.54 V (relative to RHE) the Pt electrode in $9 HClO/sub 4/ is assumed to be "clean". By taking the difference between the spectra at 0.0 and 0.54 V, the Pt-H antibonding state (electronic effect) is isolated and found to have a Fano-resonance line shape. In addition, a $9 significant Pt-H EXAFS scattering (geometric effect) was found for photon energies 0 to 20 eV above the edge. The difference between the spectra at 1.14 and 0.54 V allows isolation of the Pt-O antibonding state and the Pt-O EXAFS $9 scattering. (7 refs).oai:cds.cern.ch:4097221999
spellingShingle XX
O'Grady, W E
Ramaker, D E
Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title_full Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title_fullStr Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title_full_unstemmed Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title_short Shape resonances and EXAFS scattering in the $Pt L_{2,3}$ XANES from a Pt electrode
title_sort shape resonances and exafs scattering in the $pt l_{2,3}$ xanes from a pt electrode
topic XX
url https://dx.doi.org/10.1107/S0909049599000035
http://cds.cern.ch/record/409722
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