Efficient stabilization of cubic perovskite SrCoO3-δ by B-site low concentration scandium doping combined with sol-gel synthesis

Zeng, Pingying, Ran, Ran, Chen, Zhihao, Zhou, Wei, Gu, Hongxia, Shao, Zongping and Liu, Shaomin (2008) Efficient stabilization of cubic perovskite SrCoO3-δ by B-site low concentration scandium doping combined with sol-gel synthesis. Journal of Alloys and Compounds, 455 1-2: 465-470. doi:10.1016/j.jallcom.2007.01.144


Author Zeng, Pingying
Ran, Ran
Chen, Zhihao
Zhou, Wei
Gu, Hongxia
Shao, Zongping
Liu, Shaomin
Title Efficient stabilization of cubic perovskite SrCoO3-δ by B-site low concentration scandium doping combined with sol-gel synthesis
Formatted title
Efficient stabilization of cubic perovskite SrCoO3-δ by B-site low concentration scandium doping combined with sol-gel synthesis
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2008-05-08
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2007.01.144
Volume 455
Issue 1-2
Start page 465
End page 470
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
SrCoO3−δ is a material with multiple phase structures. The influence of Sc3+ doping in the B-site of SrCoO3−δ on its lattice structure/phase stability, electrical conductivity, and cathode performance for intermediate-temperature solid oxide fuel cells (IT-SOFCs) was investigated by X-ray diffraction, four-probe dc conductivity and impedance spectroscopy measurements, respectively. The introduction of large-size Sc3+ (0.745 Å) cation together with the sol–gel synthesis technique, led to a substantial stabilization of the cubic phase of SrCoO3−δ—even at a Sc3+ doping amount as low as 5 mol%. Such stabilization resulted in a sharp increase in the electrical conductivity of the material, which was found to be p-type in nature. A maximum electrical conductivity and favourable cubic phase stability of the material was reached at the Sc3+ doping concentration of 5–10 mol%. A further increase of Sc3+ doping, however, lowered the electrical conductivity due to the blocking effect of Sc3+ for the electron conduction. An area specific resistance (ASR) as low as 0.25 Ωcm2 was reached at 600 °C for SrSc0.1Co0.9O3−δ as a cathode material based on Sm0.15Ce0.85O1.925 electrolyte.
Keyword Oxygen permeation membrane
Scandium
Perovskite
Cathode
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Available online 2 February 2007

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
School of Engineering Publications
 
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Created: Thu, 03 Sep 2009, 10:08:29 EST by Mr Andrew Martlew on behalf of Functional Nanomaterials