Abstract
In order to decrease the sintering temperature and increase the electrode properties, Bi2O3 was employed as an addition to composite cathode material based on lanthanum manganite(LSM) and lanthanum cobaltite (LSC), and the composite material could be prepared at 1050°C in a short time. XRD result shows that it is a composite material without any obvious reaction between Bi2O3 and the LSM matrix. The material doped by 15wt% Bi2O3 had the highest conductivity. The conductivity of composite materials is lower than that of LSM and LSC without Bi2O3 addition. SEM photographs show a suitable microstructure for SOFC usage. Electrochemical polarization test shows that the exchange current density improved by the addition of Bi2O3. This improvement can be attributed to the increase of contact area between the electrolyte Bi2O3 and the LSM or LSC, and the sintering temperature has been decreased by Bi2O3 melt. These materials have been tested in SOFCs and show good properties.
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