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A mixed conductor material of a-site and b-site co-doped strontium titanate with a-site vacancy

A mixed conductor and co-doping technology, which is applied in the manufacture of oxide conductors, non-metallic conductors, cables/conductors, etc., can solve problems such as poor ionic conductivity, increase vacancy concentration, improve ionic conductivity and comprehensive conductivity Effect

Inactive Publication Date: 2018-05-11
HONGHE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the literature Fergus J W. Oxide anode materials for solid oxide fuel cells. Solid State Ionics, 2006, 177: 1529-1541 Report: La doping can improve SrTiO 3 electronic conductivity, but its ionic conductivity is relatively poor
How to improve the ion conductivity, so as to greatly improve the conductivity of this material, at present, people have not found an effective solution

Method used

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  • A mixed conductor material of a-site and b-site co-doped strontium titanate with a-site vacancy
  • A mixed conductor material of a-site and b-site co-doped strontium titanate with a-site vacancy
  • A mixed conductor material of a-site and b-site co-doped strontium titanate with a-site vacancy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: (La 0.3 Sr 0.7 ) 0.95 Ti 0.96 SM 0.04 o 3−δ Synthesized by solid phase reaction method

[0029] to La 2 o 3 , Sr(CO 3 ) 2 ,,Sm 2 o 3 ,TiO 2 As raw material, according to (La 0.3 Sr 0.7 ) 0.95 Ti 0.96 SM 0.04 o 3−δ The proportion of the elements in the mixture is prepared, using absolute ethanol as the medium, milling in an agate ball milling tank for 8 hours, mixing evenly, drying in an oven, submerging the dried powder and sieving (100 mesh), after sieving The powder was filled in a corundum crucible and synthesized at 1100°C for 10 hours in an air atmosphere. Sieve the synthesized powder (100 mesh), add 50 vol% carbon powder, 5 vol% PVA solution, mix and dry press to form, and keep the prepared sample at 1500°C for 5 hours to make a porous mixed conductor material.

Embodiment 2

[0030] Embodiment 2: (La 0.3 Sr 0.7 ) 0.93 Ti 0.96 SM 0.04 o 3−δ hydrothermal synthesis of

[0031] The raw material was La(NO 3 ) 3 , Sr(NO 3 ) 2 , Sm(NO 3 ) 3 , TiCl 4 As raw material, according to (La 0.3 Sr 0.7 ) 0.93 Ti 0.96 SM 0.04 o 3−δ The mixture was configured in a metering ratio of 1 mol / L KOH solution as a solvent, and the reaction was carried out in a sealed autoclave, and the temperature of the autoclave was raised to 150°C and kept for half an hour. After the autoclave is naturally cooled, the precipitate is washed and dried to obtain a synthetic powder. The synthesized powder was sieved (200 mesh), 10 wt% soluble starch and 5 volume% PVA solution were added, mixed and dry-pressed, and the prepared sample was kept at 1450°C for 10 hours to make a porous mixed conductor material .

Embodiment 3

[0032] Embodiment 3: (La 0.3 Sr 0.7 ) 0.91 Ti 0.96 SM 0.04 o 3−δ sol-gel synthesis

[0033] to La 2 o 3 , SrAc 2 , Sm 2 o 3 , Ti(CH 3 CH 2 CH 2 CH 2 O) 4 According to (La 0.3 Sr 0.7 ) 0.91 Ti 0.96 SM 0.04 o 3−δ Weigh the stoichiometric ratio, dissolve strontium acetate in deionized water, then dissolve butyl titanate in the mixed solution of isopropanol and absolute ethanol, stir well and add La 2 o 3 and Sm 2 o 3 . Take strontium acetate solution, add tetrabutyl titanate and La 2 o 3 and Sm 2 o 3 In the mixed solution, after magnetic stirring at room temperature for 30 minutes, let it stand for 12 hours, put it into an oven and dry it at 50 ℃ to form a fluffy xerogel. After the dry gel powder is ground, it is pre-fired at 1100°C for 12 hours to remove organic matter and obtain a powder.

[0034] The co-doped strontium titanate powder synthesized at 1100°C was dry-pressed at 50MPa, densified and sintered at 1400°C for 5 hours in the atmosphere, an...

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Abstract

The invention discloses an A-site and B-site co-doping strontium titanate mixed conductor material with A-site deficiency. The material is a product in which A-site of perovskite type SrTiO3 is doped with 30 mol% of La and B-site of perovskite type SrTiO3 is doped with 4 mol% of Sm, and a molecular formula after co-doping is (La0.3Sr0.7)1-xTi0.96Sm0.04O3-delta, in which x is equal to 0.05 to 0.09. A preparation method comprises the following steps: using a compound containing lanthanum, samarium, strontium and titanium to configure raw materials according to a stoichiometric proportion of the (La0.3Sr0.7)1-xTi0.96Sm0.04O3-delta; compounding the configured raw materials into A-site and B-site co-doping SrTiO3 powder in an air atmosphere at the temperature of 900 to 1200 DEG C with a sol-gel method; grinding the powder into fine powder with 100 to 200 meshes; adding 10% to 50% of an inflammable substance into the fine powder for press molding, and calcining for 2 to 12 hours at the temperature of 1300 to 1600 DEG C so as to obtain a mixed conductor block body. According to the material, on the basis of La doping, un-equivalent metal ions are doped on the B-site of the material, so that the ion deficiency concentration is improved, and the ionic conductivity and comprehensive conductivity of La-doped SrTiO3 are improved.

Description

technical field [0001] The invention relates to a mixed conductor material, in particular to a mixed conductor material in which the A and B positions are co-doped with strontium titanate. Background technique [0002] Oxide mixed conductors have high electronic conductivity, ion conductivity and selective oxygen permeability, and have important applications in heterogeneous catalysis, solid oxide fuel cells, sensors, oxygen ion permeable membranes, etc., and are rapidly developing in recent years. a functional material. The research on mixed conductor membrane materials is currently in the rapid development stage in the world, and many materials with high oxygen permeability have been found, but the oxygen transport mechanism, the relationship between oxygen transport and conductance, bulk properties and surface properties are not very important for oxygen. The impact of transmission and other aspects are to be further studied. It is generally believed that the oxygen per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/08H01B13/00H01M4/86H01M4/88
CPCH01B1/08H01B13/00H01M4/8652H01M4/88Y02E60/50
Inventor 单科翟凤瑞易中周刘卫
Owner HONGHE COLLEGE
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