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An Investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance

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DALTON_FINAL_REVISED.pdf (1.115Mb)
Date
04/2013
Author
Efstathiou, Paraskevi
Xu, Xiaoxiang
Menard, Herve
Irvine, John Thomas Sirr
Funder
EPSRC
Grant ID
EP/K015540/1
Keywords
Sr1−xNbO3
Photocatalytic activity
Crystal structure
Strontium niobate
Orthorhombic symmetry
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Abstract
Sr1−xNbO3 is an unusual material that displays both metallic type conduction and photocatalytic activity, despite being an NbIV oxide, and it sustains photo-oxidation without degradation. The influence of crystal structure, surface area and surface chemistry on the photocatalytic activity of strontium niobate has been investigated. The crystal structure of strontium niobate depends on the Sr content of the A site, with cubic symmetry for Sr ≤ 0.92 and orthorhombic symmetry for 0.92 < Sr ≤ 0.97. The change of crystal structure from cubic to orthorhombic symmetry seems to have a negative effect on the photocatalytic activity, as the NbO6 octahedra become distorted and unfavourable for d-orbital overlapping. The photocatalytic activity increased significantly by enlarging the surface area through ball milling, nevertheless, a clear trend for the surface area effect on activity is not obtained among samples with different Sr content. An enrichment of Sr on the surface of strontium niobate was observed by XPS, which seems to be a governing factor for improving stability.
Citation
Efstathiou , P , Xu , X , Menard , H & Irvine , J T S 2013 , ' An Investigation of crystal structure, surface area and surface chemistry of strontium niobate and their influence on photocatalytic performance ' , Dalton Transactions , vol. 42 , pp. 7880-7887 . https://doi.org/10.1039/c3dt32064b
Publication
Dalton Transactions
Status
Peer reviewed
DOI
https://doi.org/10.1039/c3dt32064b
ISSN
1477-9226
Type
Journal article
Rights
Copyright 2013, the authors. Publisher retains rights to publish. The version of record is avialable from DOI: 10.1039/C3DT32064B
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4571

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