STRUCTURE, COMPOSITION AND THERMAL-PROPERTIES OF CERIUM OXIDE-FILMS ON PLATINUM(111)

被引：97

作者：

HARDACRE, C ^{[1
]}

ROE, GM ^{[1
]}

LAMBERT, RM ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT CHEM,CAMBRIDGE CB2 1EW,ENGLAND

来源：

SURFACE SCIENCE | 1995年 / 326卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

CERIUM; NITROGEN OXIDES; OXIDATION; OXYGEN; PLATINUM;

D O I：

10.1016/0039-6028(94)00783-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxidation of Ce films on Pt(111) by O-2 and N2O and the thermal properties of the resulting oxide layers have been studied by a combination of LEED, Delta phi measurements, XP and Auger spectroscopy. Reaction with N2O results in the formation of {0001}-oriented Ce2O3, whereas O-2 generates {111}-oriented defective CeO2 containing about 20% Ce3+. Annealing results in partial reduction of these oxide layers and at similar to 1100 K a Pt/Ce surface alloy is formed, characterised by the appearance of (2 X 2) and (2 X 2)R30 degrees structures. The implications of these findings for the catalytic behaviour of Pt/ceria systems is discussed.

引用

页码：1 / 10

页数：10

共 35 条

[1] THE GROWTH, STRUCTURE AND STABILITY OF CERIA OVERLAYERS ON PD(111) [J].