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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Surface restructuring of Pt films on Au stepped surfaces: effects on catalytic behaviour

Full text
Author(s):
Prieto, Mauricio J. [1] ; Tremiliosi-Filho, Germano [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566970 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 15, n. 31, p. 13184-13189, 2013.
Web of Science Citations: 9
Abstract

In this paper, the reconstruction of Pt films deposited on stepped Au(hkl) surfaces belonging to the {[}n(111) x (110)] family of planes has been studied. Pt films were deposited using the galvanic displacement procedure of a pre-deposited Cu monolayer. We experimentally found that the Pt film deposition onto Au(hkl) surfaces is not fully epitaxial suggesting an atomic arrangement different from the underlying substrate. Additionally, we found that even though voltammetric profiles are not much different from those reported in the literature for Pt single crystals having the same crystallographic orientation, there is a reconstruction of the Pt layers on all Pt/Au(hkl) surfaces upon CO adsorption/oxidation as indicated by comparing the active areas of the Pt films before and after stripping. Additional FTIR in situ experiments on ethanol oxidation confirm that film reconstruction affects the reaction by product yield modification. (AU)

FAPESP's process: 11/12566-3 - Electronic and Structural Characterization of Pt monolayers deposited on Au vicinal surfaces
Grantee:Mauricio Javier Prieto
Support Opportunities: Scholarships in Brazil - Post-Doctoral