Cobalt-site cerium doped SmxSr1-xCoO3-δ oxides as potential cathode materials for solid-oxide fuel cells

Zhang, Guangru, Dong, Xueliang, Liu, Zhengkun, Zhou, Wei, Shao, Zongping and Jin, Wanqin (2010) Cobalt-site cerium doped SmxSr1-xCoO3-δ oxides as potential cathode materials for solid-oxide fuel cells. Journal of Power Sources, 195 11: 3386-3393. doi:10.1016/j.jpowsour.2009.12.039


Author Zhang, Guangru
Dong, Xueliang
Liu, Zhengkun
Zhou, Wei
Shao, Zongping
Jin, Wanqin
Title Cobalt-site cerium doped SmxSr1-xCoO3-δ oxides as potential cathode materials for solid-oxide fuel cells
Formatted title
Cobalt-site cerium doped SmxSr1-xCoO3 oxides as potential cathode materials for solid-oxide fuel cells
Journal name Journal of Power Sources   Check publisher's open access policy
ISSN 0378-7753
1873-2755
Publication date 2010-06-01
Sub-type Article (original research)
DOI 10.1016/j.jpowsour.2009.12.039
Open Access Status
Volume 195
Issue 11
Start page 3386
End page 3393
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
A series of new oxides with the nominal composition of SmxSr1-xCo1-yCeyO3-δ (x = 0.1, 0.3, 0.5; y = 0.05, 0.1) were synthesized. Their crystal structure, morphology, thermal expansion and electrochemical properties were systematically investigated. A phase-pure perovskite-type Sm0.3Sr0.7Co0.95Ce0.05O3-δ oxide is obtained, while the other samples are actually composed of B-site cation deficient SmxSr1-xCo1-yCey-zO3-δ (0 < z < y) and CeO2 mixed phases. These two-phase samples exhibit larger oxygen nonstoichiometry (δ) and higher average thermal expansion coefficients (TEC), while the single-phase Sm0.3Sr0.7Co0.95Ce0.05O3-δ oxide shows a smaller δ and a lower TEC as compared to Sm0.3Sr0.7CoO3-δ. The introduction of cerium also effectively suppresses the chemical expansion and the growth of grain particles. The smaller grain size is beneficial in improving the electrode surface area. In addition, the electrical conductivities of Ce-doped SmxSr1-xCoO3-δ are all higher than 200 S cm-1. EIS tests demonstrate that partially substituting Co with Ce and the B-site deficiency improve the cathode performance. Sm0.3Sr0.7Co0.95Ce0.05O3-δ shows the lowest area specific resistance (ASR) among the others. Through proper cobalt-site cerium doping, the SmxSr1-xCoO3-δ related oxides could be developed into promising cathode materials for SOFC.
Keyword Cathode
Cerium dioxide
Electrical conductivity
Solid-oxide fuel cell
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Published online 16 December 2009

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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