Unexpected behavior of the surface composition of PtRh alloys during chemical reaction

被引：19

作者：

Baraldi, A

Giacomello, D

Rumiz, L

Moretuzzo, M

Lizzit, S

de Mongeot, FB

Paolucci, G

Comelli, G

Rosei, R

Nieuwenhuys, BE

Valbusa, U

Kiskinova, MP

机构：

[1] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[2] CENMAT, I-34127 Trieste, Italy

[3] Sincroteone Triest SCpA, I-34012 Trieste, Italy

[4] Unita Genova, INFM, I-16146 Genoa, Italy

[5] Dipartimento Fis, I-16146 Genoa, Italy

[6] Leiden Univ, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 15期

关键词：

D O I：

10.1021/ja044372+

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The changes in the surface composition of a Pt50Rh50(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.

引用

页码：5671 / 5674

页数：4

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