The Study on Electrical Properties of Composite Material NdBaCo2O5+δ-NdMnO3 as IT-SOFC Cathode
Perovskite oxides NdBaCo2O5+δ(NBCO)and NdMnO3(NMO)are prepared by sol-gel method and solid-state method as cathode materials of intimidate-temperature solid oxide fuel cells(IT-SOFC).The two oxides can keep good compatibility.The conductivity of NBCO cathode presents metallic conductive properties,while that of NMO exhibits semiconductor properties,therefore the addition of NMO is unfavorable to improve the conductivity of NBCO cathode materials.Electrochemical impedance spectroscopy shows that the polarization resistance of composite cathode NBC-NM20 at 800℃ is 0.026 Ωcm2,and the addition of proper amount NMO oxide to the NBCO cathode can reduce the polarization resistance,and can effectively improve the kinetic performance of charge transfer at cathode/electrolyte interface.
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