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Structural analysis and electrochemical properties of cobalt-doped Sr0.9Ce0.1MnO3−δ cathode for IT-SOFCs

Published online by Cambridge University Press:  31 October 2014

Jiseung Ryu ,
Ryan O'Hayre  and
Heesoo Lee
Jiseung Ryu
Affiliation:
Department of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
Ryan O'Hayre
Affiliation:
Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, USA
Heesoo Lee*
Affiliation:
Department of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
*
a)Address all correspondence to this author. e-mail: heesoo@pusan.ac.kr
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Abstract

Cobalt was doped into the Ce-doped SrMnO3 system to enhance the low ionic conductivity of Ce-doped SrMnO3 (SCM) for solid oxide fuel cell cathode application. Structural and conductivity changes as a function of the Co content were investigated. Sr0.9Ce0.1Mn1–xCoxO3−δ (SCMCo, x = 0.1, 0.2, 0.3) cathode materials were synthesized by an EDTA citrate complexing process, which yielded a single perovskite structure, and the lattice volume was expanded by substituting Ce and Co ions. The increased lattice volume was attributed to a decrease in the valence state of the manganese and cobalt and an increase in the oxygen vacancy concentration. An increase in the concentration of oxygen vacancies with increasing Co content was identified by thermogravimetric analysis. The electrical conductivity decreased with increasing Co content, which was attributed to an increase in the activation energy for polaron hopping. Although the electrical conductivity was decreased by cobalt-doping, the polarization resistance of SCMCo also decreased significantly (from 5.611 to 1.171 Ω cm2 at 800 °C). The decreased polarization resistance is attributed to enhanced oxygen-ion transfer kinetics with cobalt-doping. We conclude that cobalt substitution leads to enhancement in the electrochemical properties of the cathode due to an increase in oxygen vacancy concentration.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 22 , 28 November 2014 , pp. 2667 - 2672
Copyright
Copyright © Materials Research Society 2014 

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References

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