Tuning the oxygen vacancy population of cerium oxide (CeO2-x, 0 < x < 0.5) nanoparticles

被引：93

作者：

Della Mea, Guilherme B. ^{[1
]}

Matte, Livia P. ^{[1
]}

Thill, Alisson S. ^{[1
]}

Lobato, Francielli O. ^{[2
]}

Benvenutti, Edilson V. ^{[2
]}

Arenas, Leliz T. ^{[2
]}

Juergensen, Astrid ^{[3
]}

Hergenroeder, Roland ^{[3
]}

Poletto, Fernanda ^{[2
]}

Bernardi, Fabiano ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Inst Fis, Programa Posgrad Fis, Porto Alegre, RS, Brazil

[2] Univ Fed Rio Grande do Sul, Inst Quim, Porto Alegre, RS, Brazil

[3] Leibniz Inst Analyt Wissensch ISAS eV, Dortmund, Germany

来源：

APPLIED SURFACE SCIENCE | 2017年 / 422卷

关键词：

Oxygen vacancy population; Cerium oxide; NAP-XPS; in situ time-resolved XANES; Defect chemistry; Reduction; RAY PHOTOELECTRON-SPECTROSCOPY; AMBIENT CARBON-MONOXIDE; GAS SHIFT REACTION; IN-SITU; ABSORPTION-SPECTROSCOPY; OXIDATION; ADSORPTION; REDUCTION; CO; PHOTOEMISSION;

D O I：

10.1016/j.apsusc.2017.06.101

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：

Oxygen vacancies are one of the most active defects existing at the surface of metal oxides. Engineering of defect chemistry, especially oxygen vacancies, represents the possibility of controlling the catalytic properties of nanoparticles. This work was dedicated to study the reduction properties of CeO2-x nanoparticles prepared using different synthesis parameters when exposed to a CO reducing atmosphere. Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) and in situ time-resolved X-Ray Absorption Near Edge Spectroscopy (XANES) techniques were used to probe in situ the electronic properties of these nanoparticles exposed to the CO atmosphere. Compared to typical results found for CeO2-x nanoparticles, an improved reduction tendency is observed for these synthesized nanoparticles. It was possible to tune the oxygen vacancy population and the reduction temperature (T-R) by means of the combination of synthesis and CO reducing atmosphere. The T-R and Ce(III) fraction values reached can be as low as 108 degrees C and as high as 0.92, respectively. The influence of structural and electronic properties of the nanoparticles on the reduction kinetics of the CeO2-x reduction is elucidated. The results provide a valuable route for the rational design of CeO2-x nanoparticles with the desired oxygen vacancy population, and then preparing them in the best conditions for applications. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1102 / 1112

页数：11

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