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ABO3 type perovskite composite oxides having high mixed conductivity

A composite oxide and conductivity technology, applied in the field of materials, can solve the problems of high preparation cost and complicated separation process of a single rare earth composite oxide, and achieve the effect of reducing preparation cost and high conductivity

Inactive Publication Date: 2009-04-15
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

Due to the similarity and continuity of rare earth elements in structure and physical and chemical properties, the separation process is complicated, and the preparation cost of single rare earth composite oxide is higher than that of mixed rare earth

Method used

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  • ABO3 type perovskite composite oxides having high mixed conductivity
  • ABO3 type perovskite composite oxides having high mixed conductivity
  • ABO3 type perovskite composite oxides having high mixed conductivity

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Embodiment Construction

[0016] The material of the present invention can be synthesized by solid phase reaction method, glycine-nitrate method and sol-gel method. The synthesis method of the material of the present invention will be described below by taking the sol-gel synthesis as an example.

[0017] The chemical composition formula is Sm 0.5-x Gd x Sr 0.5 CoO 3-δ System oxide, wherein: 0<x<0.5.

[0018] There are 4 examples in the embodiment of the present invention. To synthesize 0.05mol of Sm 0.5-x Gd x Sr 0.5 CoO 3-δ For example, the required ingredients are shown in Table 1. The synthesis process is as follows:

[0019] 1. Weigh a certain amount of Sm according to the stoichiometric ratio 2 o 3 (chemically pure), Gd 2 o 3 (Chemical pure) add appropriate amount of distilled water, and add excess HNO 3 Make Sm 2 o 3 、Gd 2 o 3 Dissolve completely, then add 5.317g Sr(NO 3 ) 2 , 14.625g Co(NO 3 ) 2 ·6H 2 O, control the pH value of the mixed solution between 1 and 2.

[002...

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Abstract

The invention relates to an ABO3 type perovskite composite oxide system with high mixed conductivity, in particular to double rare earth doping of A bit based on Sm0.5Sr0.5CoO3-delta (SSC), which belongs to the field of materials. The chemical equation is Sm0.5-xGdxCoO3-delta (0<x<0.5). The perovskite composite oxide has higher mixed conductivity in the scope of 500 to 800 DEG C; at 500 DEG C, the chemical equation is Sm0.3Gd0.2Sr0.5CoO3-delta, and the conductivity can reach 1820.8S.cm<-1>, which is basically the same as that of the A bit without doping Sm0.5Sr0.5CoO3-delta. The perovskite composite oxide has certain application prospect in the fields of middle-low-temperature solid oxide fuel cells, oxygen separation membranes, sensors, and the like.

Description

technical field [0001] The present invention relates to an ABO with high mixed conductivity 3 type perovskite composite oxide system, specifically related to Sm 0.5 Sr 0.5 CoO 3-δ (SSC) based on the doping of double rare earth elements at the A site, which belongs to the field of materials. Background technique [0002] LnMO 3 (Ln: rare earth element, M: Fe, Co, Ni) type perovskite composite oxide is an ion-electronic mixed conductor material (MIEC), which generally has high electronic (ion) conductivity and good catalytic performance It has broad application prospects in many fields such as solid oxide fuel cells, oxygen separation membranes, sensors, membrane catalysis and membrane reactors. [0003] Taking its application in solid oxide fuel cells (SOFC) as an example, it is well known that the operating temperature of traditional solid oxide fuel cells is often in the range of 800-1000 °C, which brings about reactions between interfaces, sealing of materials, Many ...

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Application Information

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IPC IPC(8): C04B35/32
Inventor 宋希文周芬仲崇英郭晓燕安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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