Oxidation of palladium on Au(111) and ZnO(0001) supports

Lallo, J.; Tenney, S. A.; Kramer, A.; Sutter, P.; Batzill, M.

doi:10.1063/1.4898086

Title: Oxidation of palladium on Au(111) and ZnO(0001) supports

Journal Article · Tue Oct 21 00:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4898086· OSTI ID:1182507

Lallo, J. ^[1]; Tenney, S. A. ^[2]; Kramer, A. ^[1]; Sutter, P. ^[2]; Batzill, M. ^[1]

Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials

The oxidation of supported Pd-deposits on Au(111) and ZnO(0001) single crystals has been studied by x- ray photoemission spectroscopy (XPS). Oxidation has been carried out ex-situ in a high-pressure cell with subsequent vacuum-transfer and characterization by XPS in ultrahigh vacuum (UHV), as well as using in-situ characterization by synchrotron based near-ambient pressure XPS. On Au(111) alloying of Pd with the substrate competes with oxidation and only sufficiently thick Pd films have been found to oxidize. For Pd on ZnO the oxidation conditions depend on the amount of deposited Pd. Thicker Pd deposits behave similar to bulk Pd, while thinner films oxidize already at lower temperatures. Interestingly, for very small amounts of Pd, in-situ XPS shows full oxidation at room temperature and at less than 0.6 mbar O₂ pressure. This indicates a lowering of the kinetic barriers for oxidation of very small supported Pd-clusters. The formed oxide is, however, not stable in UHV and a slow reduction is observed. The instability of this oxide indicates that the Pd-oxide formed at the interface to ZnO may have different chemical properties compared to bulk PdO or surface oxides on Pd.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC00112704; AC02-98CH10886; FG02-09ER1608

OSTI ID:: 1182507

Alternate ID(s):: OSTI ID: 1224232

Report Number(s):: BNL-107469-2015-JA; JCPSA6; R&D Project: 16080/16080; KC0403020; TRN: US1500506

Journal Information:: Journal of Chemical Physics, Vol. 141, Issue 15; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Oxidation of palladium on Au(111) and ZnO(0001) supports

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