LI, Qiang; SUN, Liping; LIHUA, Huo; ZHAO, Hui; GRENIER, Jean-Claude

doi:10.1016/j.ijhydene.2010.06.048

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LI, Qiang
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

SUN, Liping
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

LIHUA, Huo
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

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International Journal of Hydrogen Energy. 2010, vol. 35, n° 17, p. 9151-9157

Elsevier

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Brownmillerite oxide Ca2Fe2−xCoxO5 (x = 0.2, 0.4, 0.6) was characterized by XRD, SEM and electrochemical impedance spectrum (EIS), respectively. Ca2Fe2−xCoxO5 has no reaction with Sm0.2Ce0.8O1.9 (SDC) electrolyte at 1100 °C for 10 h in air. The thermal expansion coefficient (TEC) of Ca2Fe2−xCoxO5 increased with increasing Co content, and the TEC value was compatible with SDC. The electrode properties of Ca2Fe2−xCoxO5 were studied under various temperatures and oxygen partial pressures. The polarization resistance (Rp) of Ca2Fe2−xCoxO5 with x = 0.2, 0.4 and 0.6 are 0.23, 0.48 and 1.05 Ω cm2 at 700 °C in air, respectively. The rate-limiting step for oxygen reduction reaction was the charge transfer process. Ca2Fe1.8Co0.2O5 cathode exhibits the lowest overpotential of about 50 mV at a current density of 70 mA cm−2 at 700 °C in air.< Réduire

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Brownmillerite oxide

IT-SOFCs

Ca2Fe2−xCoxO5 cathodes

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Electrode properties of Co-doped Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> as new cathode materials for intermediate-temperature SOFCs

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