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Updated: Jul 22, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Unexpected behavior of the surface composition of PtRh alloys during chemical reaction
Alessandro Baraldi1, Dario Giacomello, Luca Rumiz
1Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy. alessandro.baraldi@elettra.trieste.it
Abstract:
The changes in the surface composition of a Pt(50)Rh(50)(100) alloy due to an ongoing 2H(2) + O(2)-->2H(2)O chemical reaction have been studied in situ. Exploiting the high-energy resolution and surface sensitivity of synchrotron radiation core-level spectroscopy it was possible to monitor the population of the two transitions metals atoms at the gas-surface interface. Sequences of fast high-resolution core-level spectra of the Rh3d(5/2), Pt4f(7/2), and O1s core levels showed a continuous exchange of atoms between the first and subsurface layers. An unexpected Pt surface enrichement was found under slightly oxidizing conditions, opposite to what found in a highly oxidizing atmosphere.
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