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Electrochemical Properties of Perovskites Sm-90.5-x0 Gd- x Sr-0.5 CoO -93-δ0 with Mixed Conduction

Author: GuoXiaoYan
Tutor: SongXiWen
School: Inner Mongolia University of Science and Technology
Course: Materials Science
Keywords: Composite cathode Coefficient of thermal expansion Polarization resistance Overpotential
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 35
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Abstract


With the reduction of the SOFC operating temperature, traditional the LSM cathode polarization resistance significantly increased, and the development of new cathode material the SOFC research in the field has become one of the hot spots. Sm 0.5 Sr 0.5 the CoO 3-δ in 500-700 ℃ performance in low temperature out of the good performance of the cathode, an application The cathode material of the prospects. Combination of Baotou rare earth resources, Sm, Gd symbiotic characteristics, this thesis the Sm 0.5-x the Gd x Sr the 0.5 CoO 3 - δ cathode material performance, and high ionic conductivity of the electrolyte Sm 0.2 Ce 0.8 O 2-δ (SDC) . Solid phase was prepared perovskite-type oxides Sm 0.5-x the Gd x the Sr 0.5 of CoO 3-δ (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) powder, low-temperature combustion prepared by the solid electrolyte Sm 0.2 Ce 0.8 O 2 -δ (SDC). XRD analysis of materials phase composition, thermal expansion measure the coefficient of thermal expansion of the material, the AC impedance test Sm 0.5-x the Gd x Sr 0.5 the CoO 3-δ / the SDC composite cathode polarization resistance, the three-electrode method tested Sm 0.5-x Gd x Sr 0.5 CoO 3-δ / SDC composite cathode overpotential the SEM observation electrode surface morphology and the cross-sectional structure. The results show that: The cathode powder after the 1200 ° C heat treatment 6h orthogonal perovskite type structure is formed; from room temperature to a range of 800 ° C, the material has an average coefficient of thermal expansion TEC (11.43-14.35) x 10 -6 ℃ -1 , doping the Gd 3 after Sm 0.5-x Gd x Sr 0.5 CoO 3-δ sample thermal expansion coefficient than Sm 0.5 Sr 0.5 CoO 3-δ Sample a thermal expansion coefficient slightly increases. The the sm 0.5-x the Gd x Sr 0.5 the CoO 3-δ / SDC composite cathode polarization resistance and Gd 3 doping amount and content of the SDC is closely related. 800 ℃, with Gd 3 doping increase in the amount of polarization resistance decreases first larger content of Gd 3 0.1 minimum polarization resistance, the is 0.039Ωcm2; ​​with the SDC content increases, the polarization resistance of the composite cathode is increased, by the SDC content of 10% when 0.039Ωcm2 increased to 30% 0.149Ωcm 2 . With the test temperature increases electrode polarization resistance is decreased. Sm 0.5-x Gd x Sr 0.5 CoO 3-δ / SDC composite cathode overpotential at 800 ℃ when with the increase of Gd 3 doping amount decreases and then increases with increasing SDC content increases with increasing test temperature (from 500 ℃ to 800 ℃) overpotential reduced, consistent with the variation of the polarization resistance; composite cathode of about 20 μm, uniform particles, the composite cathode is expected to become the cathode material for intermediate temperature solid oxide fuel cell.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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