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B-site vacancy Fe-doped strontium titanate and preparation method thereof

A strontium titanate and vacancy technology, which is applied in the field of B-site vacancy Fe-doped strontium titanate and its preparation, can solve problems such as poor electrical conductivity and catalytic activity, achieve low cost, improve ionic conductivity, and improve particle size. Evenly distributed effect

Inactive Publication Date: 2019-11-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this prior art still has problems such as poor electrical conductivity and catalytic activity, and does not dope any elements on the B site

Method used

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  • B-site vacancy Fe-doped strontium titanate and preparation method thereof
  • B-site vacancy Fe-doped strontium titanate and preparation method thereof
  • B-site vacancy Fe-doped strontium titanate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The B site vacancy Fe doped strontium titanate, the molecular formula is Sr(Ti 0.6 Fe 0.4 ) 1-x O 3-δ , The amount of vacancy in position B is x , A / B>1, where A is Sr, B is Ti and Fe; the amount of B site vacancy x Is 0.04.

[0024] The method for preparing Fe-doped strontium titanate with B-site vacancy includes the following steps:

[0025] Step 1. Use sol-gel method to synthesize precursor powder:

[0026] 1.0286g of strontium acetate was dissolved in 4mL of deionized water, 0.1533g of iron oxide and 0.9801g of tetrabutyl titanate were dissolved in 34mL of isopropanol and 4mL of absolute ethanol, and stirred on a magnetic stirrer for 40 minutes to form a sol; Leave it for 12 hours to form a wet gel in layers; put it in a drying box and dry it at 60°C to form a fluffy dry gel, and then grind to obtain a precursor powder;

[0027] Step 2. The precursor powder obtained in step 1 was calcined at 1100°C for 10 hours to obtain Fe-doped strontium titanate powder (Sr(Ti 0.6 Fe 0.4 ...

Embodiment 2

[0032] The B site vacancy Fe doped strontium titanate, the molecular formula is Sr(Ti 0.6 Fe 0.4 ) 1-x O 3-δ , The amount of vacancy in position B is x , A / B>1, where A is Sr, B is Ti and Fe; the amount of B site vacancy x Is 0.05.

[0033] The method for preparing Fe-doped strontium titanate with B-site vacancy includes the following steps:

[0034] Step 1. Use sol-gel method to synthesize precursor powder:

[0035] 1.0286g of strontium acetate was dissolved in 4mL of deionized water, 0.1517g of iron oxide and 0.9699g of tetrabutyl titanate were dissolved in 34mL of isopropanol and 4mL of absolute ethanol, and stirred on a magnetic stirrer for 40 minutes to form a sol; Leave it for 12 hours to form a wet gel in layers; put it in a drying box and dry it at 60°C to form a fluffy dry gel, and then grind to obtain a precursor powder;

[0036] Step 2. The precursor powder obtained in step 1 was calcined at 1100°C for 10 hours to obtain Fe-doped strontium titanate powder (Sr(Ti 0.6 Fe 0.4 ...

Embodiment 3

[0040] The B site vacancy Fe doped strontium titanate, the molecular formula is Sr(Ti 0.6 Fe 0.4 ) 1-x O 3-δ , The amount of vacancy in position B is x , A / B>1, where A is Sr, B is Ti and Fe; the amount of B site vacancy x Is 0.07.

[0041] The method for preparing Fe-doped strontium titanate with B-site vacancy includes the following steps:

[0042] Step 1. Use sol-gel method to synthesize precursor powder:

[0043] 1.0286g of strontium acetate was dissolved in 4mL of deionized water, 0.1485g of iron oxide and 0.9495g of tetrabutyl titanate were dissolved in 34mL of isopropanol and 4mL of absolute ethanol, and stirred on a magnetic stirrer for 40 minutes to form a sol; Leave it for 12 hours to form a wet gel in layers; put it in a drying box and dry it at 60°C to form a fluffy dry gel, and then grind to obtain a precursor powder;

[0044] Step 2. The precursor powder obtained in step 1 was calcined at 1100°C for 10 hours to obtain Fe-doped strontium titanate powder (Sr(Ti 0.6 Fe 0.4 ...

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Abstract

The invention relates to B-site vacancy Fe-doped strontium titanate and a preparation method thereof, and belongs to the technical field of functional materials. The molecular formula of the B-site vacancy Fe doped strontium titanate is Sr (Ti0. 6Fe0. 4) < 1-x > O < 3-delta >, wherein the B-site vacancy amount is x, A / B is greater than 1, A is the molar weight of Sr, and B is the total molar weight of Ti and Fe. The preparation method comprises the following steps: synthesizing precursor powder by adopting a sol-gel method: dissolving strontium acetate, ferric oxide and tetrabutyl titanate which serve as raw materials into isopropanol and absolute ethyl alcohol according to a molecular formula molar ratio, and sufficiently stirring on a magnetic stirrer for 40 minutes to form sol; standingfor 12 hours, and layering to form wet gel; putting into a drying box, drying at 60 DEG C to form fluffy dry gel, and grinding to obtain precursor powder; and calcining the obtained precursor powderat 1100 DEG C for 10 hours to obtain the B-site vacancy Fe-doped strontium titanate powder. The purpose of the method is to improve the conductivity and catalytic activity of the material by doping pure SrTiO3.

Description

Technical field [0001] The invention relates to a B-site vacancy Fe-doped strontium titanate and a preparation method thereof, and belongs to the technical field of functional materials. Background technique [0002] A solid oxide fuel cell (SOFC) is an energy conversion device that directly converts chemical energy into electrical energy. As an all-ceramic power generation system, the solid oxide fuel cell (SOFC) has attracted wide attention because of its more advantages than traditional power generation systems in terms of conversion efficiency, fuel adaptability and environmental pollution. Ni / YSZ cermet is a commonly used traditional SOFC anode material, which has excellent combustion catalytic activity, good ionic conductivity and electronic conductivity. But when using hydrocarbons as fuel, Ni / YSZ cermets have low tolerance to sulfur and carbon. The oxidation of Ni will cause the thermal cycle instability of Ni / YSZ cermet during redox. Due to the existence of these prob...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/624C04B35/626C04B35/622H01M4/90H01M4/86
CPCC04B35/47C04B35/624C04B35/626C04B35/622H01M4/9033H01M4/86H01M2004/8689C04B2235/3272C04B2235/656C04B2235/6567Y02E60/50
Inventor 周俊文李润萍刘建华邵娅敏崔凯辉李熙腾
Owner KUNMING UNIV OF SCI & TECH
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