Insight into restructuring of Pd-Au nanoparticles using EXAFS

Boubnov, Alexey; Timoshenko, Janis; Wrasman, Cody J.; Hoffman, Adam S.; Cargnello, Matteo; Frenkel, Anatoly I.; Bare, Simon R.

doi:10.1016/j.radphyschem.2019.04.054

Insight into restructuring of Pd-Au nanoparticles using EXAFS

Journal Article · Mon Apr 29 00:00:00 EDT 2019 · Radiation Physics and Chemistry (1993)

DOI:https://doi.org/10.1016/j.radphyschem.2019.04.054· OSTI ID:1769959

Boubnov, Alexey ^[1]; Timoshenko, Janis ^[2]; Wrasman, Cody J. ^[3]; Hoffman, Adam S. ^[1]; Cargnello, Matteo ^[1]; Frenkel, Anatoly I. ^[4]; Bare, Simon R. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stony Brook Univ., NY (United States)
Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

We acquired Pd K-edge and Au L₃-edge EXAFS spectra of two libraries of titania-supported Pd-doped Au nanoparticle catalysts representing the as-prepared and post-catalysis state. The nanoparticles have narrow particle size distributions, in the range 2.8–6.6 nm, and were synthesized to preferentially locate the palladium atoms on the surface of a gold core, with Pd mole fractions of 1.4–38%. EXAFS spectra of both the as-prepared samples and post-catalysis Pd-Au particles were collected and modeled. EXAFS refinement of all samples showed contributions from both Pd-Au and Pd-Pd scattering paths, revealing that Pd and Au components alloyed together. Pd was in a partially oxidized state as evidenced by a Pd-O scattering contribution, unlike Au. Overlaying measured coordination numbers from the libraries with predicted values, using models of surface and bulk alloying, showed that Pd restructures among Au as a result of exposure to the reaction conditions.

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC02-76SF00515; FG02-03ER15476

OSTI ID:: 1769959

Alternate ID(s):: OSTI ID: 1634256
OSTI ID: 1635036

Journal Information:: Radiation Physics and Chemistry (1993), Journal Name: Radiation Physics and Chemistry (1993) Vol. 175; ISSN 0969-806X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (9)

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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
Catalyst
Dilute alloy
Gold
Multi-edge EXAFS
Palladium
Structural model

Insight into restructuring of Pd-Au nanoparticles using EXAFS

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