Oxidation of Supported PtRh Particles: Size and Morphology Effects

被引：6

作者：

Dalmiglio, M. ^{[1
,2
]}

Amati, M. ^{[1
]}

Gregoratti, L. ^{[1
]}

Mentes, T. O. ^{[1
]}

Nino, M. A. ^{[1
]}

Felisari, L. ^{[3
]}

Kiskinova, M. ^{[1
]}

机构：

[1] Sincrotrone Trieste, I-34012 Basovizza Trieste, Italy

[2] Univ Trieste, Grad Sch Nanotechnol, I-34127 Trieste, Italy

[3] CNR, INFM, Lab TASC, I-34012 Trieste, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 40期

关键词：

NANOPARTICLES; SURFACE; RH; MICROSCOPY; REDUCTION; RHODIUM; OXYGEN; PHOTOEMISSION; CATALYST; METALS;

D O I：

10.1021/jp910370r

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 chemical and structural evolution of supported Path alloy nano- and microparticles during oxidation has been studied by means of scanning photoelectron microscopy (SPEM) and low energy electron microscopy (LEEM). The SPEM Rh 3d and Pt 4f images and microspot spectra revealed a higher reactivity of the Rh atoms and coexistence of several stoichiometric and nonstoichiometric Rh and Pt oxide phases with welt developed lateral variations in the oxidation states with a single microparticle. The observed variations in the local reactivity were correlated to the complex initial surface morphology of the particles and the following structural changes upon oxidation monitored by LEEM.

引用

页码：16885 / 16891

页数：7

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