Solid oxide fuel cell electrode material and preparation method thereof

A fuel cell electrode, solid oxide technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of high interface polarization resistance and low chemical catalytic activity, and achieve low interface polarization resistance and simple operation. , the effect of good compatibility

Inactive Publication Date: 2021-12-31
苏州正义新能源科技有限公司
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is for SmBaCo in the prior art 2 o 5+δ In order to solve the problems of low electrochemical catalytic activity and high interfacial polarization resistance of the base double perovskite cathode material, a double perovskite intermediate temperature solid oxide fuel cell cathode material and its preparation method are provided, through the cheap and stable Ca and Fe To SmBaCo 2 o 5+δ Co-doping, replacing Ba and Co with Ca and Fe respectively, can obtain a new type of solid oxide fuel cell cathode material with stable performance in the medium temperature range and good electrochemical catalytic performance, which can effectively reduce the SmBaCo 2 o 5+δ Interfacial polarization resistance of the base double perovskite cathode material in the medium temperature region, and significantly improve its electrochemical catalytic activity

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  • Solid oxide fuel cell electrode material and preparation method thereof
  • Solid oxide fuel cell electrode material and preparation method thereof

Examples

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Embodiment 1

[0040] This embodiment provides a kind of medium temperature solid oxide fuel cell cathode material, chemical formula is SmBa 0.9 Ca 0.1 co 1.5 Fe 0.5 o 5+δ , δ is the content of oxygen vacancies, and the content of oxygen vacancies in the sample is measured by iodometric titration method δ=0.72.

[0041] In this example, SmBa 0.9 Ca 0.1 co 1.5 Fe 0.5 o 5+δ A method for preparing a cathode material for a medium-temperature solid oxide fuel cell, comprising the following steps:

[0042] (a) According to the stoichiometric ratio of the chemical formula, weigh Sm 2 o 3 8.72g, BaCO 3 8.88g, CaCO 3 0.5g, Co 2 o 3 6.22g and Fe 2 o 3 2.0g raw material;

[0043] (b) Fully mix all the above-mentioned weighed powders with deionized water and balls, the mass ratio of material: balls: water is 1:2:3, and put it on a planetary ball mill for ball milling. The speed of the ball mill is 300r / min. The ball milling time is 8 hours. After ball milling, pour the material into a ...

Embodiment 2

[0052] This embodiment provides a kind of medium temperature solid oxide fuel cell cathode material, chemical formula is SmBa 0.8 Ca 0.2 co 1.25 Fe 0.75 o 5+δ , δ is the content of oxygen vacancies, and the content of oxygen vacancies in the sample is measured by iodometric titration method δ=0.76.

[0053] In this example, SmBa 0.8 Ca 0.2 co 1.25 Fe 0.75 o 5+δ A method for preparing a cathode material for a medium-temperature solid oxide fuel cell, comprising the following steps:

[0054] (a) According to the stoichiometric ratio of the chemical formula, weigh Sm 2 o 3 8.72g, BaCO 3 7.89g, CaCO 3 1.0g, Co 2 o 3 5.18g and Fe 2 o 3 3.0g raw material;

[0055] (b) Fully mix all the above-mentioned weighed powders with deionized water and balls, the mass ratio of material: balls: water is 1:2:3, and put it on a planetary ball mill for ball milling. The speed of the ball mill is 300r / min. The ball milling time is 16 hours. After ball milling, pour the material in...

Embodiment 3

[0064] This embodiment provides a kind of medium temperature solid oxide fuel cell cathode material, chemical formula is SmBa 0.75 Ca 0.25 CoFeO 5+δ , δ is the content of oxygen vacancies, and the content of oxygen vacancies in the sample is measured by iodometric titration method δ=0.88.

[0065] In this example, SmBa 0.75 Ca 0.25 CoFeO 5+δ A method for preparing a cathode material for a medium-temperature solid oxide fuel cell, comprising the following steps:

[0066] (a) According to the stoichiometric ratio of the chemical formula, weigh Sm 2 o 3 8.72g, BaCO 3 7.4g, CaCO 3 1.25g, Co 2 o 3 4.15g and Fe 2 o 3 4.0g raw material;

[0067] (b) Fully mix all the above-mentioned weighed powders with deionized water and balls, the mass ratio of material: balls: water is 1:2:3, and put it on a planetary ball mill for ball milling. The speed of the ball mill is 300r / min. The ball milling time is 12 hours. After ball milling, pour the material into a beaker and put it i...

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Abstract

The invention discloses a Ca and Fe co-doped SmBaCo2O5+delta-based double-perovskite type intermediate-temperature solid oxide fuel cell cathode material and a preparation method thereof. The chemical formula of the cathode material is SmBa1-xCaxCo2-yFeyO5+delta, (x = 0, y = 0; x = 0.25, y = 0; andx = 0.25, y = 1.0), x is the doping amount of Ca, x is more than 0 and less than or equal to 0.25, y is the doping amount of Fe, y is more than 0 and less than or equal to 1.0, delta is the oxygen vacancy content, and delta is more than 0 and less than 1. The cathode material is prepared in one step by adopting a solid-phase reaction method, co-doping is performed through low-cost and stable Ca and Fe, Ba and Co in SmBaCo2O5+delta are replaced with Ca and Fe respectively, the cathode material which is stable in structure in a medium-temperature range, good in oxygen reduction catalytic property and excellent in single-cell performance can be obtained, and the material is suitable for preparing a medium-temperature solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular relates to a double perovskite type intermediate temperature solid oxide fuel cell cathode material and a preparation method thereof. Background technique [0002] The solid oxide fuel cell (SOFC) is an all-solid-state power generation device with the advantages of high efficiency, low environmental pollution, and excellent fuel applicability, which can directly convert the chemical energy stored in the fuel into electrical energy. However, the cathode material The operating temperature is generally greater than 800°C, and high operating temperature will lead to disadvantages such as poor material compatibility, long-term stability of the battery, and high cost. Therefore, lowering the operating temperature of SOFC to medium temperature (600-800°C) has become a research hotspot of SOFC. However, the reduction of operating temperature will weaken the diffusion of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M8/10
CPCH01M8/10H01M4/9025Y02E60/50
Inventor 郑益锋
Owner 苏州正义新能源科技有限公司
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