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Structure and Dynamics of Applied Nanomaterials

An In¬-Situ Study of Bond Strains in 1nm Pt Catalysts

BondStrains The electronic and atomic structural properties of nanoscale metal catalysts exhibit complex influences with origins related to particle size, metal-support, and metal-adsorbate interactions. The experimental investigation of these factors, as well as the elucidation of the impacts they have on mechanisms in catalysis, are hindered by their interdependency in working catalysts. We demonstrate in this work that the features underpinning bond strains and adsorbate-bonding effects in nm-scale Pt catalysts supported on both γ-alumina and carbon can be distinguished and analyzed using combined high energy resolution fluorescence detection (HERFD) X-ray absorption spectroscopy methods, namely, HERFD XANES and HERFD EXAFS.  The work extends insights into the fluxional structural dynamics obtained in these systems, a feature harboring significant consequences for understandings of both their properties and mechanisms of action.

A. I. Frenkel, M. W. Small, J. G. Smith, R. G. Nuzzo, K. O. Kvashnina, M. Tromp
An in situ study of bond strains in 1nm Pt catalysts and their sensitivities to the cluster-support and cluster-adsorbate interactions
J. Phys. Chem. C 117, 23286-23294 (2013)

M. W. Small, J. Kas, K. O. Kvashnina, J. J. Rehr, R. G. Nuzzo, M. Tromp, A. I. Frenkel
Effects of adsorbate coverage and bond length disorder on the d-band center in carbon-supported Pt catalysts
Chem. Phys. Chem. 15, 1569-1572 (2014)