Perovskite Co-based composite negative electrode material as well as preparation and application thereof

A composite cathode and perovskite-type technology, applied in battery electrodes, solid electrolyte fuel cells, electrical components, etc., can solve the problems of low thermal expansion coefficient of cathode materials, inconsistent thermal matching of base electrolyte, high thermal expansion coefficient, etc., and achieve high output Effects of power, excellent electrochemical performance, and catalytic activity at high and medium temperatures

Active Publication Date: 2012-07-11
锦州宇博保温建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At 800 °C, the electronic conductivity of the LSCF system reaches 10 2 ~10 3 S/cm, the conduction of oxygen ions through the oxygen vacancy diffusion mechanism can reach 10 -2 ~100S/cm oxygen ion conductivity, but the thermal expansion coefficient of

Method used

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  • Perovskite Co-based composite negative electrode material as well as preparation and application thereof
  • Perovskite Co-based composite negative electrode material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0034] Example 1

[0035] ①Electron-oxygen ion mixed conductor La 0.7 Sr 0.15 Ca 0.15 co 0.8 Fe 0.2 o 3-δ Cathode material preparation

[0036] a. La(NO 3 ) 3 ·6H 2 O(AR), Sr(NO 3 ) 2 (AR), Ca(NO 3 ) 2 4H 2 O(AR), Co(NO 3 ) 3 ·6H 2 O(AR) and Fe(NO 3 ) 3 9H 2 O(AR) by La 0.7 Sr 0.15 Ca 0.15 co 0.8 Fe 0.2 o 3-δ After weighing the stoichiometric ratio, dissolve with distilled water to form a nitrate mixed solution; be 1.5: 1 to take citric acid according to the mol ratio of citric acid (AR) and metal ion, and dissolve citric acid with distilled water;

[0037] b. Pour the citric acid solution into the nitrate mixed solution, and adjust the pH to 2 with ammonia water;

[0038] c. Stir the mixed solution magnetically at 65-75°C. With the continuous evaporation of the solvent, the solution gradually thickens and finally forms a gel; place the gel in an electric constant temperature blast drying oven at 120°C to dry the precursor ;

[0039] d. The precursor ...

Example Embodiment

[0057] Example 2

[0058] ①Electron-oxygen ion mixed conductor La 0.7 Sr 0.15 Ca 0.15 co 0.8 Fe 0.2 o 3-δ Cathodic material synthesis

[0059] a. La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Ca(NO 3 ) 2 4H 2 O, Co(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O Press La 0.7 Sr 0.15 Ca 0.15 co 0.8 Fe 0.2 o 3-δ After the stoichiometric ratio is weighed, it is dissolved in distilled water to form a mixed solution of nitrate; the citric acid is weighed according to the molar ratio of metal ions in the mixed solution of citric acid and nitrate is 2:1, and the citric acid is dissolved in distilled water.

[0060] b. with embodiment 1.

[0061] c. With embodiment 1.

[0062] d. The precursor was microwave-calcined at 1000 °C for 1.5 h to prepare the electron-oxygen ion mixed conductor La with perovskite structure 0.7 Sr 0.15 Ca 0.15 co 0.8 Fe 0.2 o 3-δ cathode material.

[0063] Step 2. and 3. are with embodiment 1;

[0064] Wherein 4. b step is as follows, other ste...

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Abstract

The invention relates to an A-site double-doped Co-based perovskite composite negative electrode material as well as preparation and application thereof, and relates to the field of an intermediate-temperature solid oxide fuel cell, belonging to the field of new energy materials. The perovskite Co-based composite negative electrode material consists of the following components in percentage by mass: 50% of La0.7Sr0.15Ca0.15Co0.8Fe0.2O(3-delta), 37.5% of Ce0.8Sm0.2O(2-delta) and 12.5% of Li2CO3 and Na2CO3. The composite negative electrode material has high electronic and ionic conductivities, relatively high intermediate-temperature catalytic activity and good electrochemical performance, and is relatively well compatible with a cerium-based electrolytic material in terms of thermal performance and chemical performance; and moreover, as the negative electrode of a intermediate-temperature solid oxide fuel cell, the composite negative electrode material has relatively high output power.

Description

technical field [0001] The invention relates to an A-site double-doped Co-based perovskite type composite cathode material and its preparation and application, relates to the field of medium-temperature solid oxide fuel cells, and belongs to the field of new energy materials. Background technique [0002] Solid oxide fuel cell (SOFC, solid oxide fuel cell) is an energy conversion device that directly converts the chemical energy of fuel gas and oxidizing gas into electrical energy. It has the advantages of cleanliness and high efficiency, so it is called two Green energy in the eleventh century. [0003] At present, the traditional cathode material lanthanum manganate has a rapid decrease in conductivity and a rapid increase in polarization resistance under medium temperature conditions, that is, below 800 °C, which is difficult to meet the requirements of intermediate temperature solid oxide fuel cells (ITSOFC, Intermediate temperature solid oxide fuel cell). ) requirement...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/48H01M4/86H01M8/12
CPCY02E60/122Y02E60/521Y02E60/525Y02E60/10Y02E60/50
Inventor 高文元刘建波韩庆贺
Owner 锦州宇博保温建材有限公司
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