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Low thermal expansion cathode material for solid oxide fuel cell and preparation method thereof

A solid oxide and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the overall thermal expansion coefficient of the composite cathode, weakening the performance of the composite cathode, and reducing the electrical performance, achieving low cost and simple preparation method. , the effect of simple equipment

Active Publication Date: 2019-11-29
HUAIBEI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In another case, the cathode and the electrolyte are mixed in a certain proportion to make a composite cathode to reduce the overall thermal expansion coefficient of the composite cathode to adapt to the electrolyte. gradually weaken
2. The thermal expansion of the material is weakened and the electrical performance is reduced

Method used

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  • Low thermal expansion cathode material for solid oxide fuel cell and preparation method thereof
  • Low thermal expansion cathode material for solid oxide fuel cell and preparation method thereof
  • Low thermal expansion cathode material for solid oxide fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare BSCF, where x=0;

[0025] 1) Before weighing, Ba(NO 3 ) 2 ,Sr(NO 3 ) 2 ,Co(NO 3 ) 2 ·6H 2 O,Fe(NO 3 ) 3 9H 2 O placed in a dry box 40 o C dried for 3 hours;

[0026] 2) Dissolve the weighed EDTA in ammonia solution and set aside;

[0027] 3) Ba(NO 3 ) 2 ,Sr(NO 3 ) 2 ,Co(NO 3 ) 2 ·6H 2 O,Fe(NO 3 ) 3 9H 2 O powder is weighed according to the molar ratio of 0.5:0.5:0.8:0.2, and the four raw materials are added to EDTA-ammonia solution and mixed, and the mixed solution is stirred on a heatable magnetic stirrer, and the heating temperature is set to 80 o C;

[0028] 4) After the nitrate is fully dissolved, add citric acid and adjust the pH value of the solution to 5 with ammonia water;

[0029] 5) Keep the solution temperature at 80 o C, until the gel is formed;

[0030] 6) Place the colloid at 85 o Dry in an oven at C for 20 hours, then increase the oven temperature to 110 o C placed for 6 hours until completely dry;

[0031] 7) Precursor...

Embodiment 2

[0037] Prepare BSCFM-0.1, where x=0.1;

[0038] 1) Before weighing, Ba(NO 3 ) 2 ,Sr(NO 3 ) 2 ,Co(NO 3 ) 2 ·6H 2 O,Fe(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 ·6H 2 O placed in a dry box 40 o C dried for 3 hours;

[0039] 2) Dissolve the weighed EDTA in ammonia solution and set aside;

[0040] 3) Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 ·6H 2 O powder is weighed according to the molar ratio of 0.5:0.5:0.7:0.2:0.1, and the five raw materials are mixed in EDTA-ammonia solution, and the mixed solution is stirred on a heatable magnetic stirrer, and the heating temperature is set to 80 o C;

[0041] 4) After the nitrate is fully dissolved, add citric acid and adjust the pH value of the solution to 5 with ammonia water;

[0042] 5) Keep the solution temperature at 80 o C, until the gel is formed;

[0043] 6) Place the colloid at 85 o Dry in an oven at C for 20 hours, then increase the oven temperature to 110 o C placed for ...

Embodiment 3

[0051] Prepare BSCFM-0.3, where x=0.3;

[0052] 1) Before weighing, Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 ·6H 2 O placed in a dry box 40 o C dried for 3 hours;

[0053] 2) Dissolve the weighed EDTA in ammonia solution and set aside;

[0054] 3) Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(NO 3 ) 2 ·6H 2 O powder is weighed according to the molar ratio of 0.5:0.5:0.5:0.2:0.3, and the five raw materials are mixed in EDTA-ammonia solution, and the mixed solution is stirred on a heatable magnetic stirrer, and the heating temperature is set to 80 o C;

[0055] 4) After the nitrate is fully dissolved, add citric acid and adjust the pH value of the solution to 5 with ammonia water;

[0056] 5) Keep the solution temperature at 80 o C, until the gel is formed;

[0057] 6) Place the colloid at 85 o Dry in an oven at C for 20 hours, then increase the oven temperature to 110 o C placed f...

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PUM

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Abstract

The invention discloses a low thermal expansion cathode material for a solid oxide fuel cell. The low thermal expansion cathode material is prepared from barium, strontium, cobalt, iron and manganese, wherein Mn partially replaces Co in a Ba0.5Sr0.5Co0.8Fe0.2O3-delta-based cathode material; replacement is carried out in a position B of a perovskite structure; the content of manganese in a cathode is not greater than 15%, and the proportion of Co and Mn in a chemical formula is (0.8-x):x; and a cathode composition is expressed as Ba0.5Sr0.5Co0.8-xFe0.2MnxO3-delta, wherein x is greater than 0 and less than 0.3. The cathode material releases lattice oxygen at a slower speed, oxygen vacancy concentration in lattices is controlled, and thermal expansion changes slowly along with rise of the temperature, so that the thermal matching performance of the cathode and an electrolyte is improved; further the electrical property of the cathode is not weakened; and the preparation method is simple, uses simple equipment, is low-cost, has high repeatability, and is easy for industrial production.

Description

technical field [0001] The present invention relates to a kind of Ba for SOFC 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ A (BSCF)-based cathode material and a preparation method thereof belong to the technical field of solid oxide fuel cells. Background technique [0002] The BSCF-based cathode is a kind of iron-cobaltate, which is used in the middle temperature stage of SOFC (600-800 o C) has a high electrical conductivity, and its oxygen surface exchange coefficient and oxygen self-diffusion coefficient are both high. It has high catalytic activity for the reduction of oxygen, and the cathode material has no chemical reaction with the cerium-based electrolyte, and has good chemical compatibility. The material belongs to ABO 3 Type perovskite structure, its A and B site elements have strong openness and can be replaced or doped. In general, A-site doping can increase the oxygen vacancies in the perovskite structure and increase the conductivity of oxygen ions, but the concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8652H01M4/88Y02E60/50
Inventor 李德川张永兴朱光平汪徐德
Owner HUAIBEI NORMAL UNIVERSITY
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