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Effects of Adsorbate Coverage and Bond-Length Disorder on the d-Band Center of Carbon-Supported Pt Catalysts

Small, M. W., Kas, J. J., Kvashnina, K. O., Rehr, J. J., Nuzzo, R. G., Tromp, M. & Frenkel, A. I., 6-Jun-2014, In : Chemphyschem. 15, 8, p. 1569-1572 4 p.

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  • Effects of Adsorbate Coverage and Bond‐Length Disorder on the d‐Band Center

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DOI

  • Matthew W. Small
  • Joshua J. Kas
  • Kristina O. Kvashnina
  • John J. Rehr
  • Ralph G. Nuzzo
  • Moniek Tromp
  • Anatoly I. Frenkel

Determination of the factors that affect the d-band center of catalysts is required to explain their catalytic properties. Resonant inelastic X-ray scattering (RIXS) enables direct imaging of electronic transitions in the d-band of Pt catalysts in real time and in realistic environmental conditions. Through a combination of in situ, temperature-resolved RIXS measurements and theoretical simulations we isolated and quantified the effects of bond-length disorder and adsorbate coverage (CO and H-2) on the d-band center of 1.25 nm size Pt catalysts supported on carbon. We found that the decrease in adsorbate coverage at elevated temperatures is responsible for the d band shifts towards higher energies relative to the Fermi level, whereas the effect of the increase in bond-length disorder on the d-band center is negligible. Although these results were obtained for a specific case of non-interacting support and weak temperature dependence of the metal-metal bond length in a model catalyst, this work can be extended to a broad range of real catalysts.

Original languageEnglish
Pages (from-to)1569-1572
Number of pages4
JournalChemphyschem
Volume15
Issue number8
Publication statusPublished - 6-Jun-2014
Externally publishedYes

    Keywords

  • catalysis, nanoparticles, platinum, resonant inelastic X-ray scattering, X-ray absorption spectroscopy, METAL-SURFACES, ELECTRONIC-STRUCTURE, OXYGEN REDUCTION, CO, REACTIVITY, ADSORPTION, STRAIN, EXAFS

ID: 107582084