Atomic layer reversal on CeO2 (100) surface

被引：19

作者：

Huang, Jinglu ^{[1
,2
]}

Yu, Yunbo ^{[3
,4
,5
]}

Zhu, Jing ^{[1
,2
]}

Yu, Rong ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Natl Ctr Electron Microscopy Beijing, Sch Mat Sci & Engn, Key Lab Adv Mat,Minist Educ China, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China

[4] Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China

[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SCIENCE CHINA-MATERIALS | 2017年 / 60卷 / 09期

基金：

中国国家自然科学基金;

关键词：

surface structure; ceria; atomic layer reversal; aberration-corrected TEM; first-principles calculations; TOTAL-ENERGY CALCULATIONS; MICROSCOPIC OBSERVATIONS; CERIA; OXIDATION; NANOPARTICLES; NANOCRYSTALS; CATALYSTS; BEHAVIOR; SHAPE;

D O I：

10.1007/s40843-017-9082-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structure and properties of CeO2 surfaces have been intensively studied due to their importance in a lot of surface-related applications. Since most of surface techniques probe the structure information inside the outermost surface plane, the subsurface structure information has been elusive in many studies. Using the profile imaging with aberration-corrected transmission electron microscopy, the structure information in both the outermost layer and the sublayers of the CeO2 (100) surface has been obtained. In addition to the normal structures that have been reported before, where the surface is Ce-or O-terminated, a metastable surface has been discovered. In the new structure, there is an atomic layer reversal between the outermost layer and the sublayer, giving a structure with O as the outermost layer for the stoichiometry of normal Ce-terminated surface. The charge redistribution for the polarity compensation has also been changed relative to the normal surface.

引用

页码：903 / 908

页数：6

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