Imaging the Atomic Surface Structures of CeO2 Nanoparticles

Yuyuan Lin; Zili Wu; Jianguo Wen; Kenneth R. Poeppelmeier; Laurence D. Marks

doi:10.1021/nl403713b

Imaging the Atomic Surface Structures of CeO₂ Nanoparticles

Yuyuan Lin
, Zili Wu
, Jianguo Wen
, Kenneth R. Poeppelmeier
, Laurence D. Marks

Surface Chemistry & Catalysis Group

Research output: Contribution to journal › Letter › peer-review

213 Scopus citations

Abstract

Atomic surface structures of CeO₂ nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures of the (100), (110), and (111) surfaces of CeO₂ nanocubes. The predominantly exposed (100) surface has a mixture of Ce, O, and reduced CeO terminations, underscoring the complex structures of this polar surface that previously was often oversimplified. The (110) surface shows “sawtooth-like” (111) nanofacets and flat CeO_2–x terminations with oxygen vacancies. The (111) surface has an O termination. These findings can be extended to the surfaces of differently shaped CeO₂ nanoparticles and provide insight about face-selective catalysis.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Nano Letters
Volume	14
Issue number	1
DOIs	https://doi.org/10.1021/nl403713b
State	Published - Jan 8 2014

Funding

We acknowledge funding from Northwestern University Institute for Catalysis in Energy Processes (ICEP) on Grant DOE DE-FG02-03-ER15457 (Y.L., K.R.P., and L.D.M.). The electron microscopy was performed at the Electron Microscopy Center for Materials Research at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory operated under Contract No. DE-AC02-06CH11357 by UChicago Argonne, LLC. The synthesis of CeO nanoparticles and the IR work were conducted at Oak Ridge National Laboratory and sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. Part of the synthesis and IR work were conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. 2

Keywords

CeO
aberration corrected HREM
atomic surface structures
nanocube
nanoparticle catalysis

Access to Document

10.1021/nl403713b

Cite this

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title = "Imaging the Atomic Surface Structures of CeO2 Nanoparticles",

abstract = "Atomic surface structures of CeO2 nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures of the (100), (110), and (111) surfaces of CeO2 nanocubes. The predominantly exposed (100) surface has a mixture of Ce, O, and reduced CeO terminations, underscoring the complex structures of this polar surface that previously was often oversimplified. The (110) surface shows {\textquotedblleft}sawtooth-like{\textquotedblright} (111) nanofacets and flat CeO2{\textendash}x terminations with oxygen vacancies. The (111) surface has an O termination. These findings can be extended to the surfaces of differently shaped CeO2 nanoparticles and provide insight about face-selective catalysis.",

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doi = "10.1021/nl403713b",

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T1 - Imaging the Atomic Surface Structures of CeO2 Nanoparticles

AU - Lin, Yuyuan

AU - Wu, Zili

AU - Wen, Jianguo

AU - Poeppelmeier, Kenneth R.

AU - Marks, Laurence D.

PY - 2014/1/8

Y1 - 2014/1/8

N2 - Atomic surface structures of CeO2 nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures of the (100), (110), and (111) surfaces of CeO2 nanocubes. The predominantly exposed (100) surface has a mixture of Ce, O, and reduced CeO terminations, underscoring the complex structures of this polar surface that previously was often oversimplified. The (110) surface shows “sawtooth-like” (111) nanofacets and flat CeO2–x terminations with oxygen vacancies. The (111) surface has an O termination. These findings can be extended to the surfaces of differently shaped CeO2 nanoparticles and provide insight about face-selective catalysis.

AB - Atomic surface structures of CeO2 nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures of the (100), (110), and (111) surfaces of CeO2 nanocubes. The predominantly exposed (100) surface has a mixture of Ce, O, and reduced CeO terminations, underscoring the complex structures of this polar surface that previously was often oversimplified. The (110) surface shows “sawtooth-like” (111) nanofacets and flat CeO2–x terminations with oxygen vacancies. The (111) surface has an O termination. These findings can be extended to the surfaces of differently shaped CeO2 nanoparticles and provide insight about face-selective catalysis.

KW - CeO

KW - aberration corrected HREM

KW - atomic surface structures

KW - nanocube

KW - nanoparticle catalysis

UR - https://www.scopus.com/pages/publications/84892149114

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DO - 10.1021/nl403713b

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