Pair Distribution Function Analysis of Structural Disorder by Nb5+ Inclusion in Ceria: Evidence for Enhanced Oxygen Storage Capacity from Under-Coordinated Oxide

被引：36

作者：

Hiley, Craig I. ^{[1
]}

Playford, Helen Y. ^{[2
]}

Fisher, Janet M. ^{[3
]}

Felix, Noelia Cortes ^{[3
]}

Thompset, David ^{[3
]}

Kashtiban, Reza J. ^{[4
]}

Walton, Richard I. ^{[1
]}

机构：

[1] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England

[2] Rutherford Appleton Lab, STFC ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] Johnson Matthey Technol Ctr, Sonning Common, Reading RG4 9NH, Berks, England

[4] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2018年 / 140卷 / 05期

关键词：

DOPED CERIA; REDUCTION; COMBUSTION; SITES;

D O I：

10.1021/jacs.7b12421

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Partial substitution of Ce4+ by Nb5+ is possible in CeO2 by coinclusion of Na+ to balance the charge, via hydrothermal synthesis in sodium hydroxide solution. Pair distribution function analysis using reverse Monte Carlo refinement reveals that the small pentavalent substituent resides in irregular coordination positions in an average fluorite lattice, displaced away from the ideal cubic coordination toward four oxygens. This results in under coordinated oxygen, which explains significantly enhanced oxygen storage capacity of the materials of relevance to redox catalysis used in energy and environmental applications.

引用

页码：1588 / 1591

页数：4

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