A medium-temperature solid oxide fuel cell cathode having a Ba<2+>-vacant Cu<2+>-doped perovskite structure and a preparing method thereof

Abstract

The invention relates to a medium-temperature solid oxide fuel cell cathode having a Ba<2+>-vacant Cu<2+>-doped perovskite structure and a preparing method thereof, and belongs to the field of energy materials. The chemical formula of the medium-temperature SOFC cathode having the Ba<2+>-vacant Cu<2+>-doped perovskite structure is PrBa<1-x>Co<2-y>CuyO<6-delta>, wherein the vacancy amount x of Ba<2+> is 0.02-0.1, the doping amount y of Cu<2+> is 0.2-1.5, and the delta is the oxygen vacancy content and changes along with the vacancy amount of the Ba<2+> and the doping amount of the Cu<2+>. By introduction of Ba<2+> vacancy and Cu<2+> doping into the PrBa<1-x>Co<2-y>CuyO<6-delta>, oxygen reduction catalytic activity of the cathode is improved by 30-60%, the thermal expansion coefficient (TEC) is reduced by 20-40%, and comprehensive performance of the SOFC cathode is improved. The cathode material is prepared by a sol-gel method and is simple in preparation process.

Description

technical field [0001] The present invention relates to a Ba 2+ Vacancies and Cu 2+ The invention relates to a cathode of a medium-temperature solid oxide fuel cell with a doped perovskite structure and a preparation method thereof, belonging to the field of energy materials. Background technique [0002] Solid oxide fuel cell (SOFC) is a new type of green alternative energy, which reduces the working temperature from 1000℃ to 600-800℃, which is an important development direction in the field of SOFC. As the operating temperature of SOFC decreases, the oxygen reduction catalytic activity of the cathode decreases, and the polarization impedance increases rapidly, which becomes the key factor limiting the output power of SOFC at medium and low temperature. Therefore, high oxygen reduction catalytic activity is the primary condition that the cathode of medium temperature SOFC must have. . Cobalt-based perovskite structure oxide is an important SOFC cathode material, which ha...

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Problems solved by technology

[0003] In order to solve the problems of low oxygen reduction catalytic activity and high TEC existing in medium temperature SOFC cathode materials with cobalt-based perovskite structure, the present invention provides a Ba 2+ Vacancies and Cu 2+ Doped perovskite structure medium temperature SOFC cathode material and preparation method thereof; the Ba 2+ Vacancies and Cu 2+ The chemical formula of doped perovskite structure SOFC cathode material is PrBa 1-x co 2-y Cu y o 6-δ , Ba 2+ Defect x=0.02-0.1, Cu 2+ Doping amount y=0.2-1.5, δ is oxygen vacancy content, with Ba 2+ Vacancies and Cu 2+ Doping amount changes; the PrBa 1-x co 2-y Cu y o 5+δ The cathode material is prepared by a sol-gel method, and the preparation process is simple; the present invention passes through the PrBa 1-x co 2-y Cu y o 6-δ Introduce Ba into the oxide 2+ Vacancies and Cu 2+ Doping, improve the oxygen reduction catalytic activity of the SOFC cathode and reduce the TEC value, and realize the optimization of the comprehensive performance of the cathode