Performance evaluation of Mn and Fe doped SrCo0.9Nb0.1O3-δ cathode for IT-SOFC application

International Conference on Advances in Materials and Manufacturing Applications 2017

Bele, Lokesh^1 ; Lenka, R.K.^2 ; Patro, P.K.^2 ; Muhmood, L.^1 ; Mahata, T.^2 ; Sinha, P.K.^2

K J Somaiya College of Engineering, Vidyavihar, Mumbai, India^1

Powder Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, India^2

关键词: Area-specific resistances;    Electrical conductivity;    Electrochemical activities;    Gadolinia-doped ceria electrolytes;    Intermediate-temperature fuel cells;    Performance evaluations;    Phase compatibility;    Thermal expansion coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012107/pdf
DOI  :  10.1088/1757-899X/310/1/012107

来源: IOP

【 摘 要 】

Cathode materials of Mn and Fe doped SrCo0.9Nb0.1O3-δ, are synthesized by solid state route for intermediate temperature fuel cell applications. Phase pure material is obtained after calcining the precursors at 1100 °C. Phase compatibility is observed between this novel cathode material with gadolinia doped ceria (GDC) electrolyte material as reflected in the diffraction pattern. The state of art YSZ electrolyte is not compatible with this cathode material. Average thermal expansion coefficient of the material varies between 17 to 22 X 10-6K-1on doping, from room temperature to 800 °C. Increase in thermal expansion coefficient is observed with Mn and Fe doping associated with the loss of oxygen from the crystal. The electrical conductivity of the cathode material decreases with Fe and Mn doping. Mn doped samples show lowest conductivity. From the symmetric cell measurement lower area specific resistance (0.16 o-cm2) is obtained for un-doped samples, at 850 °C. From the initial results it can be inferred that Mn/Fe doping improves neither the thermal expansion co-efficient nor the electrochemical activity.