Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces

被引：8
作者：
Ginting, Elfrida [1 ]
Peterson, Erik Wayne [1 ]
Zhou, Jing [1 ]
机构：
[1] Univ Wyoming, Dept Chem, Laramie, WY 82071 USA
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2016年 / 197卷
基金：
美国国家科学基金会;
关键词：
Ceria; Manganese; Dopant; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; CEO2(111) THIN-FILMS; GAS-SHIFT REACTION; ELECTRONIC-STRUCTURE; VACANCY FORMATION; REDOX BEHAVIOR; CO OXIDATION; CATALYSTS; OXIDE; XPS; NANOPARTICLES;
D O I：
10.1016/j.apcatb.2016.04.020
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 growth and structure of Mn on reducible ceria were investigated under ultrahigh vacuum conditions with X-ray photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy techniques. Submonolayer coverage of Mn was deposited on well-ordered CeOx(111) (1.5<x<2) thin films by physical vapor deposition method at room temperature. Mn is oxidized and formally in the +2 oxidation state on both fully oxidized and partially reduced ceria. Oxidation of Mn is accompanied with the reduction of ceria. STM results show the presence of atomic-layer high islands of Mn forming Mn-O-Ce linkages uniformly distributed on the ceria surface. With heating to higher temperatures, these Mn0 features can coalesce to form slightly larger two-dimensional structures. Our combined spectroscopy and microscopy studies demonstrate a strong interaction between Mn and ceria supports. Introduction of Mn can form mixed Mn-Ce oxides at the interface which can represent model metal-doped ceria surfaces for further examination of the chemical behavior. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：337 / 342
页数：6
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