Effects of Adsorbate Coverage and Bond-Length Disorder on the d-Band Center of Carbon-Supported Pt CatalystsSmall, 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.
Research output: Contribution to journal › Article › Academic › peer-review
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.
|Number of pages||4|
|Publication status||Published - 6-Jun-2014|
- catalysis, nanoparticles, platinum, resonant inelastic X-ray scattering, X-ray absorption spectroscopy, METAL-SURFACES, ELECTRONIC-STRUCTURE, OXYGEN REDUCTION, CO, REACTIVITY, ADSORPTION, STRAIN, EXAFS