Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-delta as a cathode of solid oxide fuel cells operating below 600 degrees C

Zhou, W., Jin, W. Q., Zhu, Z. H. and Shao, Z. P. (2010) Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-delta as a cathode of solid oxide fuel cells operating below 600 degrees C. International Journal of Hydrogen Energy, 35 3: 1356-1366. doi:10.1016/j.ijhydene.2009.11.092


Author Zhou, W.
Jin, W. Q.
Zhu, Z. H.
Shao, Z. P.
Title Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-delta as a cathode of solid oxide fuel cells operating below 600 degrees C
Journal name International Journal of Hydrogen Energy   Check publisher's open access policy
ISSN 0360-3199
Publication date 2010-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.ijhydene.2009.11.092
Open Access Status
Volume 35
Issue 3
Start page 1356
End page 1366
Total pages 11
Place of publication Oxford
Publisher Pergamon Press
Language eng
Subject 2105 Renewable Energy, Sustainability and the Environment
2103 Fuel Technology
3104 Condensed Matter Physics
2102 Energy Engineering and Power Technology
Abstract SrNb0.1Co0.9O3-delta (SNC) perovskite oxide has been prepared by high-energy ball milling followed by calcination at 1100 degrees C. According to oxygen temperature-programmed desorption and thermogravimetry analysis results, highly charged Nb5+ successfully stabilizes the perovskite structure to avoid order-disorder phase transition. The electrical conductivity reaches 550 S cm(-1) at 300 degrees C in air and as high as 106 S cm(-1) under P(O-2) = 1 x 10(-5) atm at 900 degrees C. The high electrical conductivity is beneficial in improving the charge-transfer process for the oxygen reduction reaction on the cathode. Based on the defect chemical analysis, the Nb-doping in SrCoO3-delta perovskite facilitates the formation of Co2+, which increases oxygen nonstoichiometry and, subsequently, the mixed valence of [Co2+]/[CO3+] under lower oxygen partial pressure. A relatively low thermal expansion coefficient of 19.1 x 10(-6) K (1) in air was achieved. All above properties show SNC to be a promising cathode material in the practical application of low-temperature solid oxide fuel cells. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved
Keyword Perovskites
Fuel cell materials
Electrochemistry
Vacancies
Electrochemical impedance
High-temperature transport
Oxygen Nonstoichiometry
Composite Cathode
Ba0.5sr0.5co0.8fe0.2o3-delta Perovskite
Performance
Stability
Permeation
Reduction
Srsc0.2co0.8o3-delta
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 20646002
2007AA05Z133
2007CB209704
Institutional Status UQ
Additional Notes Received 20 October 2009; revised 25 November 2009; accepted 25 November 2009. Available online 22 December 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Sun, 14 Mar 2010, 10:04:37 EST