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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

REFERENCES

Hashimoto, S. and Iwahara, H.: Structural, thermal and electrical properties of Ce-doped SrMnO3 . J. Electroceram. 4, 225 (2000).Google Scholar
Hashimoto, S. and Iwahara, H.: Study on the structural and electrical properties of Sr1-xCexO3-α (x = 0.1, 0.3) perovskite oxide. Mater. Res. Bull. 35, 2253 (2000).Google Scholar
Lee, K.J. and Iguchi, E.: Electronic properties of SrMnO3 . J. Solid State Chem. 114, 242 (1995).CrossRefGoogle Scholar
Jeong, C., Ryu, J., Noh, T., Kim, Y-N., and Lee, H.: Structural analysis and electrode performance of Ce doped SrMnO3 synthesized by EDTA citrate complexing process. Adv. Appl. Ceram. 112, 494 (2013).CrossRefGoogle Scholar
Ryu, J., O'Hayre, R., and Lee, H.: Polarization resistance and composite cathode of Ce doped SrMnO3 system for intermediate temperature solid oxide fuel cells. Solid State Ionics 260, 60 (2014).Google Scholar
Huang, K., Lee, H., and Goodenough, J.: Sr- and Ni-doped LaCoO3 and LaFeO3 perovskites new cathode materials for solid oxide fuel cells. J. Electrochem. Soc. 145(9), 3220 (1998).Google Scholar
Chen, F. and Liu, M.: Study of transition metal oxide doped LaGaO3 as electrode materials for LSGM-based solid oxide fuel cells. J. Solid State Electrochem. 3, 7 (1998).CrossRefGoogle Scholar
Noh, T., Ryu, J., Kim, J., Kim, Y-N., and Lee, H.: Structural and impedance analysis of copper doped LSM cathode for IT-SOFCs. J. Alloys Compd. 557, 196 (2013).Google Scholar
Rao, Y., Zhong, S., He, F., Wang, Z., Peng, R., and Lu, Y.: Cobalt-doped BaZrO3: A single phase air electrode material for reversible solid oxide cells. Int. J. Hydrogen Energy 37(17), 12522 (2012).Google Scholar
Trofimenko, N.E. and Ullmann, H.: Oxygen stoichiometry and mixed ionic-electronic conductivity of Sr1-aCeaFe1-bCobO3-x perovskite-type oxides. J. Eur. Ceram. Soc. 20, 1241 (2000).CrossRefGoogle Scholar
Mandal, P., Hassen, A., and Loidl, A.: Effect of Ce doping on structural, magnetic, and transport properties of SrMnO3 perovskite. Phys. Rev. B 69(22), (2004).Google Scholar
Sundaresan, A., Tholence, J.L., Maignan, A., Martin, C., Hervieu, M., Raveau, B., and Suard, E.: Jahn-Teller distortion and magnetoresistance in electron doped Sr1−xCexMnO3 (x = 0.1, 0.2, 0.3 and 0.4). Eur. Phys. J. B 14, 431 (2000).Google Scholar
Fossdal, A., Menon, M., Waernhus, I., Wiik, K., Einarsrud, M-A., and Grande, T.: Crystal structure and thermal expansion of La1-xSrxFeO3-δ materials. J. Am. Ceram. Soc. 87, 1952 (2004).Google Scholar
Ge, L., Zhu, Z., Shao, Z., Wang, S., and Liu, S.: Effects of preparation methods on the oxygen nonstoichiometry, B-site cation valences and catalytic efficiency of perovskite La0.6Sr0.4Co0.2Fe0.8O3−δ . Ceram. Int. 35(8), 3201 (2009).Google Scholar
Sun, C., Hui, R., and Roller, J.: Cathode materials for solid oxide fuel cells: A review. J. Solid State Electrochem. 14(7), 1125 (2009).CrossRefGoogle Scholar
Aguadero, A., Calle, C.D.L., Alonso, J.A., Escudero, M.J., Fernandez-Diaz, M.T., and Daza, L.: Structural and electrical characterization of the novel SrCo0.9Sb0.1O3–δ perovskite: Evaluation as a solid oxide fuel cell cathode material. Chem. Mater. 19, 6437 (2007).Google Scholar
Zener, C.: Interaction between the d-shells in the transition metals. II. Ferromagnetic compounds of manganese with perovskite structure. Phys. Rev. 82(3), 403 (1951).Google Scholar
Pal, S., Banerjee, A., Rozenberg, E., and Chaudhuri, B.K.: Polaron hopping conduction and thermoelectric power in LaMnO3+δ . J. Appl. Phys. 89(9), 4955 (2001).Google Scholar
Murray, E.P., Sever, M.J., and Barnett, S.A.: Electrochemical performance of (La,Sr)(Co,Fe)O3-(Ce,Gd)O3 composite cathodes. Solid State Ionics 148, 27 (2002).Google Scholar
Qiang, F., Sun, K., Zhang, N., Zhu, X.D., Le, S.D., and Zhou, D.R.: Characterization of electrical properties of GDC doped A-site deficient LSCF based composite cathode using impedance spectroscopy. J. Power Sources 168(2), 338 (2007).Google Scholar