| Summary: | Solid oxide fuel cell (SOFC) performance is highly dictated by the ohmic
loss of the electrolyte and the resistance due to the cathodic polarization. To reduce
the large polarization losses, dual composite cathodes have been introduced. The
objectives of this research are to fabricate the LSCF-SDCC/YSZ-SDCC and LSCF�SDC/YSZ-SDC dual composite cathodes powders via ball milling process and
evaluate the influence of dual cathode composition and carbonate on the
characteristics on physical, morphology and chemical bonding of cathode. In this
study, the cathode composite powder is developed from mixture of YSZ-SDC
electrolyte powders will be mixed with various ratio 50:50, 60:40 and 70:30 wt%.
Powder mixing was done through ball milling method. After mixing, YSZ-SDC
electrolyte powders were calcined at 950℃. The morphology of YSZ-SDC powder
showed intergranular pores textures are observed at the contact of YSZ and SDC due
to SDC lower melting point compared to YSZ which made SDC easily diffuse into
YSZ. No additional phase formation is presented in XRD patterns which indicates
that there are no crystalline impurities. There is no other chemical bond pattern on
side A and B such as carbon. Therefore, YSZ-SDC combination will work together
to improve the SOFC conductivity and it is expected to allow the cell operates at
intermediate to low temperature.
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