Density functional theory analysis of reactivity of Pt_xPd_y alloy clusters Academic Article

abstract

• We investigate the reactivity of various PtxPdy combinations (with x + y = 10 and various x:y ratios) towards the adsorption of specific intermediates of the oxygen reduction, using the B3PW91 hybrid density functional theory. The reactivity is shown to be not only sensitive to the composition of the cluster, but also to the atomic distribution. The calculations indicate that two different ensembles: one ordered and one randomly mixed, with overall composition Pt3Pd7 are thermodynamically more favorable than pure Pt10 for the oxygen reduction reaction. The reasons for this behavior are clearly explained in terms of the atomic and electronic distribution, which makes the Pd atoms to act as electron donors both to Pt atoms and to the adsorbates, thus the reactivity of the Pd atoms in such environment becomes intermediate between Pt and Pd. Moreover, it is found that in a mixed Pt3Pd7 state the electronic distribution makes the average atom more similar to Pt than to Pd, whereas in an ordered Pt3Pd7 cluster, the average atom is more similar to Pd than to Pt. 2006 Elsevier B.V. All rights reserved.

authors

• Balbuena, Perla

published proceedings

• SURFACE SCIENCE

altmetric score

• 3

author list (cited authors)

• Calvo, S. R., & Balbuena, P. B.

citation count

• 29

complete list of authors

• Calvo, Sergio R||Balbuena, Perla B

publication date

• January 2007

publisher

• Elsevier  Publisher

published in

• Surface Science  Journal

keywords

• Bimetallic Nanoclusters
• Density Functional Calculations
• Oxygen Reduction Reaction
• Reactivity

Digital Object Identifier (DOI)

• 10.1016/j.susc.2006.09.017

start page

• 165

end page

• 171

volume

• 601

issue

• 1

URL

• http://dx.doi.org/10.1016/j.susc.2006.09.017