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A kind of preparation method of strontium titanate lanthanum base powder material

A powder material, strontium lanthanum-based technology, applied in the field of preparation of strontium lanthanum titanate-based powder materials, can solve the problems of affecting battery performance, less active area, and unfavorable post-production of solid oxide fuel cells, etc.

Inactive Publication Date: 2016-12-14
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0003] However, the perovskite-type lanthanum-doped strontium titanate anode material is usually synthesized by solid-state reaction method, which requires repeated calcination, the final phase formation temperature is high, and the obtained powder particles are relatively large, which is not conducive to the later preparation of solid oxide fuel cells. At the same time, the large particles lead to a small specific surface area, and the active area for effective reaction on the anode side is small, which in turn affects the performance of the battery.

Method used

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  • A kind of preparation method of strontium titanate lanthanum base powder material
  • A kind of preparation method of strontium titanate lanthanum base powder material

Examples

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example 1

[0021] La 0.3 Sr 0.7 Ti 0.99 co 0.01 o 3 ±δ (0≦δ≦1) powder synthesis, the specific steps are as follows:

[0022] The raw material is: tetrabutyl titanate (C 16 h 36 o 4 Ti), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 3 ·6H 2 O), calcined lanthanum oxide (La 2 o 3 ), citric acid, nitric acid, ammonia water, absolute ethanol.

[0023] Synthesize 0.01 mol La according to the stoichiometric ratio 0.3 Sr 0.7 Ti 0.99 co 0.01 o 3 ±δ (0≦δ≦1), weigh the required strontium nitrate, cobalt nitrate, lanthanum oxide, 20 ml deionized water, 15 ml concentrated nitric acid, and ammonia water to prepare a uniform light red solution A.

[0024] Weigh the required citric acid and dissolve it in 20 ml of deionized water to adjust the pH with ammonia water to obtain solution B; add 40 ml of absolute ethanol to the weighed tetrabutyl titanate solution to obtain a uniform solution C; Add it dropwise to the C solution, and keep stirring, then at 80 o C water b...

example 2

[0028] La 0.3 Sr 0.7 Ti 0.97 co 0.03 o 3 ±δ (0≦δ≦1) powder synthesis, the specific steps are as follows:

[0029] The raw material is: tetrabutyl titanate (C 16 h 36 o 4 Ti), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 3 ·6H 2 O), calcined lanthanum oxide (La 2 o 3 ), citric acid, nitric acid, ammonia water, absolute ethanol.

[0030] Synthesize 0.01 mol La according to the stoichiometric ratio 0.3 Sr 0.7 Ti 0.97 co 0.03 o 3 ±δ (0≦δ≦1), weigh the required strontium nitrate, cobalt nitrate, lanthanum oxide, 20 ml deionized water, 15 ml concentrated nitric acid, and ammonia water to prepare a uniform light red solution A.

[0031] Weigh the required citric acid and dissolve it in 20 ml deionized water to adjust the pH with ammonia water to obtain solution B. Add 40 ml of absolute ethanol to the weighed tetrabutyl titanate solution to obtain a homogeneous solution C. Then add the B solution dropwise to the C solution, and keep stirring, then...

example 3

[0035] La 0.3 Sr 0.7 Ti 0.95 co 0.05 o 3 ±δ (0≦δ≦1) powder synthesis, the specific steps are as follows:

[0036] The raw material is: tetrabutyl titanate (C 16 h 36 o 4 Ti), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 3 ·6H 2 O), calcined lanthanum oxide (La 2 o 3 ), citric acid, nitric acid, ammonia water, absolute ethanol.

[0037] Synthesize 0.01mol La according to the stoichiometric ratio 0.3 Sr 0.7 Ti 0.95 co 0.05 o 3 ±δ (0≦δ≦1), weigh the required strontium nitrate, cobalt nitrate, lanthanum oxide, 20 ml deionized water, 15 ml concentrated nitric acid, and ammonia water to prepare a uniform light red solution A.

[0038] Weigh the required citric acid and dissolve it in 20 ml deionized water to adjust the pH with ammonia water to obtain solution B. Add 40 ml of absolute ethanol to the weighed tetrabutyl titanate solution to obtain a homogeneous solution C. Then add the B solution dropwise to the C solution, and keep stirring, then ...

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Abstract

A preparation method for a strontium titanate lanthanum based powder material belongs to the field of fuel cells. The method adopts a citric acid-nitrate spontaneous combustion method, using citric acid as a complexing agent and a reducing agent, using nitric acid as an oxidizing agent, introducing a sintering acid ammonium nitrate in-situ, dissolving with metal nitrate in deionized water, adding a tetrabutyl titanate citric acid solution to form an even transparent solution, heating in water bath, removing surplus water, forming even sol, and heating the sol in a muffle furnace till spontaneous combustion happens to form fluffy precursor powder. Then Grinding and calcining in an electric furnace to obtain single strontium lanthanum based anode powder. The preparation method has the advantages of being simple in synthesis process, low in cost, fine and even in powder particles and low in material phase forming temperature. The method is also applicable to synthesis preparation of strontium titanate based nanometer powder and can be used for laboratory synthesis and industrial production of a solid oxide fuel cell anode powder material.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a method for preparing a strontium lanthanum titanate-based powder material suitable for solid oxide fuel cell anodes. technical background [0002] In recent decades, SOFC, as an alternative energy technology with the most commercial potential, has become a research hotspot worldwide. At present, the fuel gas used in SOFC work is mainly hydrogen, and because the preparation cost of hydrogen is very high, and there are still big problems in the transportation and storage of hydrogen, these make the cost of SOFC remain high, and it is difficult to realize commercial application. Therefore, the current development trend of SOFC is to directly use hydrocarbons as fuel. Because the traditional anode material Ni / YSZ will cause severe carbon deposition and sulfur poisoning when it catalyzes hydrocarbon fuels, Ni sintering and other problems will occur after long-term work, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/626H01M4/86
CPCY02E60/50
Inventor 赵海雷杜志鸿夏青沈永娜王捷
Owner UNIV OF SCI & TECH BEIJING
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