SOFC Cathode Materials

B.C.H. Steele, Isotopic oxygen exchange and optimisation of SOFC cathode materials, in F.W. Poulsen, J.J. Bentzen, T. Jacobsen, E. Skou and M.J.L. 0stergSrd (Eds.), High Temperature Electrochemical Behaviour of Fast Ion and Mixed Conductors. Riso National Laboratory, Denmark, 1993, pp. 423-430. 

Key words Manganites/SOFC Cathode Materials/Synthesis/Co-Precipitation/Particle Size... 

The simple method of shortcut determination of a transitional metals charge state in mixed-valence compounds which are applied as SOFC cathode materials is tested. The standard X-ray diffractometers which are present in the majority material-sciency laboratories are used for this purpose. The offered method is applied at the research of 3d-metals valency in some lanthanum manganites, nickelites and cobaltites. As the measurement standards the metals and their oxides were used. 

Perovskites as SOFC cathode material electrode-electrolyte reactions and electrochemical characterisation. Solid Oxide Fuel Cells 10 (Sofc-X), Pts 1 and 2 7 1015... 

Ean, B., Yan, J., and Yan, X. (2011) The ionic conductivity, thermal expansion behaviour and chemical compatibility of hao.S4Sro.44Coo,2Fco.803 s as SOFC cathode material. Solid State Set, 13,... 

Redox behaviour of potential SOFC cathode materials Lai.6Sro.4Nii.xCOx04+6 (x = 0.6 and 0.8) determined from in situ neutron powder diffraction under fiowing O2 and 5%H2... 

A large group of chemical compositions has been investigated as potential candidates for IT SOFC cathode materials. A recent article by Skinner has provided an overview of the progress of perovskite type oxides for the SOFC cathode, with an emphasis on the role of chemical compositions [41]. On the contrary, microstructure plays a major role in the cathode function as well. This is particularly true when the composite cathode, which shows a better performance compared to a single composition cathode, is used. Several authors have shown that electrode microstructure and transport properties have a profound effect on polarization. Tanner et al. [42] have shown that polarization resistance (Rp) depends upon the grain size, d, of the ionic conductor in the composite electrode and the volume fraction porosity, which was further derived as in (1) by considering the monolayer gas adsorption. A similar relation has been proposed as [43] ... 

The solid-state synthesis with low grinding time may be an economically viable technique for the preparation of SOFC cathode in large scale. The reduction in the time of synthesis and energy consumption contributes significantly to the implementation of this methodology for the preparation of SOFC cathode materials. 

A. Aguadero, J.A. Alonso, M.J. Escudero, L. Daza, Evaluation of the La2Nii-xCux04+ system as SOFC cathode material with 8YSZ and LSGM as electrolytes. Solid State Tonies 179, 393 00 (2008)... 

E. Bucher, A. Egger, M. Yang, W. Sitte, F. Klauser, E. Bertel, In situ studies of long term degradation of the IT-SOFC cathode materials LSCF and NDN, in European SOFC Symposium, Lucerne, 2010... 

Strategies for Perspective Cathode Materials for IT-SOFC focuses upon perovskite materials that show promise as intermediate temperature SOFC cathode materials. This chapter discusses perovskites properties and then has a closer look at LSCF (Lai cSrjcCoo.2Feo.803, 5) and how its stmctural and transport properties vary with A or B site doping. 

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