A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells

Jiang, Shanshan, Zhou, Wei, Sunarso, Jaka, Ran, Ran and Shao, Zongping (2015) A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells. International Journal of Hydrogen Energy, 40 45: 15578-15584. doi:10.1016/j.ijhydene.2015.09.097


Author Jiang, Shanshan
Zhou, Wei
Sunarso, Jaka
Ran, Ran
Shao, Zongping
Title A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells
Journal name International Journal of Hydrogen Energy   Check publisher's open access policy
ISSN 0360-3199
1879-3487
Publication date 2015-12-07
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.ijhydene.2015.09.097
Open Access Status Not Open Access
Volume 40
Issue 45
Start page 15578
End page 15584
Total pages 7
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
A cobalt-free layered oxide-Sr4Fe6O13−δ is synthesized and characterized for application as a cathode of intermediate temperature solid oxide fuel cells. High temperature powder x-ray diffraction, oxygen temperature programmed desorption and electrochemical impedance spectroscopy are employed to evaluate the temperature-dependent crystal structure and oxygen reduction reaction (ORR) activity of Sr4Fe6O13−δ. The oxide exhibits a single phase between room temperature and 1050 °C with low thermal expansion coefficient. The drawback of this oxide lies on its low ORR activity which is likely due to its layered structure which favors oxygen ionic transport two-dimensionally in the ac plane along the layered oxide layer. We show here that the original ORR activity can be improved by adjusting the phase compositions through an oxygen-deficient calcination process. An area specific resistance of 0.139 Ω cm2 at 700 °C is attained by calcining Sr4Fe6O13−δ at 900 °C with ∼66.2 wt% of perovskite phase in the composite material.
Keyword Cathode
Cobalt-free
Layered oxides
Perovskites
Solid oxide fuel cells
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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