Structural and electrochemical properties of Pr0.3Sr0.7Co0.3Fe0.7O3−δ cathode for IT-SOFC

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The electrochemical properties and microstructure changes of Pr0.3Sr0.7Co0.3Fe0.7O3−δ (PSCF3737) were studied in this paper. It was confirmed through X-ray photoelectron spectroscopy and extended X-ray absorption fine structure analysis that the oxygen vacancy of PSCF3737 was lower and that the atomic distance between an oxygen atom and a neighboring atom (especially cobalt) of PSCF3737 was longer compared to those of Pr0.3Sr0.7CoO3 − δ (PSC37). In addition, the surface reaction of PSCF3737 changed from a one-electron reduction mechanism to a two-electron reduction mechanism, which may lead to enhancement of the cathode performance. The area specific resistance of PSCF3737 was 0.11 Ω cm2 at 700 °C after changing the fabrication conditions of the cathode in order to optimize the microstructure. A single cell test was performed using PSCF3737. A maximum power density of 315 mW/cm2 at 575 °C was obtained.
Publisher
Elsevier
Issue Date
2009-08
Keywords

Strontium-doped praseodymium; cobalt ferrites (PSCF); Oxygen reduction reaction; Gas diffusion; Area specific resistance; Power density

Citation

International Journal of Hydrogen Energy, Vol.34, No.16, pp.6852-6860

ISSN
0360-3199; http://dx.doi.org/10.1016/j.ijhydene.2009.05.138
URI
http://hdl.handle.net/10203/12252
Appears in Collection
ME-Journal Papers(저널논문)

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