Cathode material of solid oxide fuel cell and preparation method thereof

A fuel cell cathode, solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inconsistent thermal matching of LSGM electrolyte and high thermal expansion coefficient of LSFO system, and achieve short preparation cycle, small particle diameter, speed up The effect of speed of reaction

Inactive Publication Date: 2011-05-11
UNIV OF SCI & TECH BEIJING
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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 Oxygen ion conductivity of ~100 S / cm (Beson S J, Waller D, Kilner J A), however, the thermal expansion coefficient of the LSFO system is high, which does not match the thermal compatibility of the LSGM electrolyte

Method used

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  • Cathode material of solid oxide fuel cell and preparation method thereof
  • Cathode material of solid oxide fuel cell and preparation method thereof
  • Cathode material of solid oxide fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: 0.04mol La 1.2 Sr 0.8 FeO 4±δ Synthesis of Glycine Method and Its Conductivity Test

[0022] 1. Weigh 0.048mol of lanthanum nitrate into a beaker, add deionized water, heat on an electric furnace at 200°C, stir, and dissolve to form a colorless transparent solution.

[0023] 2. Weigh 0.032mol of strontium nitrate, put it into a beaker, add deionized water, and ultrasonically disperse it to completely dissolve it.

[0024] 3. Weigh 0.04mol of ferric nitrate nonahydrate, add deionized water and ultrasonically disperse to completely dissolve

[0025] 4. Weigh 0.24 mol of glycine, add deionized water and ultrasonically disperse to dissolve completely.

[0026] 5. Mix the above-mentioned transparent solution evenly, heat to 230°C in an evaporating dish, and evaporate the excess water until it spontaneously ignites to form a porous foamy powder.

[0027] 6. After the foamy powder is pretreated at 600°C, it is ground, and a part of the powder is taken out and c...

Embodiment 2

[0030] Example 2: 0.08mol La 1.2 Sr 0.8 FeO 4±δ Synthesis of Glycine Method and Its Conductivity Test

[0031] 1. According to La 1.2 Sr 0.8 FeO 4±δ For the stoichiometric ratio of substances, weigh 0.096mol of lanthanum nitrate, 0.064mol of strontium nitrate, and 0.08mol of ferric nitrate nonahydrate, and dissolve them in deionized water to form a colorless transparent solution.

[0032] 2. According to the ratio of glycine to metal ion is 1.8, weigh 0.432 mol of glycine, add deionized water and ultrasonically disperse to dissolve completely.

[0033] 3. Mix the above transparent solution evenly, stir and heat to 200°C in an evaporating dish, evaporate the excess water until it spontaneously ignites to form a porous foamy powder.

[0034] 4. After the foamy powder is pretreated at 500°C, it is ground, and a part of the powder is taken out and calcined at 950°C for 10b, cooled to room temperature, ground, and tested by X-ray diffraction.

[0035] 5. Grind the pretreated...

Embodiment 3

[0037] Example 3: 0.02mol La 1.2 Sr 0.8 FeO 4±δ Synthesis of Glycine Method and Its Conductivity Test

[0038] 1. According to La 1.2 Sr 0.8 FeO 4±δ The stoichiometric ratio of the metal ions, weighing 0.024mol of lanthanum nitrate, 0.016mol of strontium nitrate, 0.02mol of iron nitrate nonahydrate, according to the ratio of glycine and metal ions is 2.2, weighing 0.132mol of glycine, dissolved into Ionized water, ultrasonically dispersed to make it completely dissolved, forming a colorless and transparent solution, heated to 250 ° C in an evaporating dish, evaporated to dry excess water, until spontaneous combustion, forming a porous foamy powder.

[0039] 2. Pretreat the foamy powder at 650°C, grind it, take out a part of the powder and calcinate at 1000°C for 8 hours, cool to room temperature, grind it, and do X-ray diffraction test.

[0040] 3. Grind the powder after pretreatment at 650°C, add it to the mold, hold the pressure for 35 minutes under the gauge pressure ...

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Abstract

The invention belongs to the field of fuel cells, in particular the field of a cathode material of a solid oxide fuel cell. The cathode material of the solid oxide fuel cell has a molecular formula of LaxSr2-xFeO4+ / -delta, and is characterized in that: x is equal to 1.2; and the molecular formula is La1.2Sr0.8FeO4+ / -delta. The invention also discloses a method for preparing the cathode material. Compared with the prior art, a glycine method provided by the invention for preparing the cathode material of the solid oxide fuel cell has the advantages that: 1, compared with a solid-state reactionmethod, the glycine method has short preparation period and low thermal treatment temperature of powder, and the obtained powder is purer and can be produced on a large scale; 2, compared with a citric acid-nitrate method and an ethylene diamine tetraacetic acid (EDTA)-citric acid method, the glycine method has a simple preparation process and the pH value of solution is not required to be adjusted; and 3, the glycine is used as an oxidant, so the reaction is quickened and smaller particle diameter can be obtained.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to the field of solid oxide fuel cell cathode materials. Background technique [0002] A fuel cell is a device that converts the chemical energy of fuel into electrical energy. It is not limited by the Carnot cycle. x , SO 2 and noise emissions), almost no nitrogen oxides and sulfur oxides, and carbon dioxide emissions are reduced by more than 40% compared with conventional power plants. In addition, the construction of fuel cell power plants has the advantages of short construction time and small footprint Features. Therefore, it is one of the most promising and clean power generation technologies, known as the green energy of the 21st century. In addition to the characteristics of fuel cells, solid oxide fuel cells (SOFC) are widely used because of their solid-state structure, wide fuel range, high operating temperature, and high comprehensive utilization rate. [0003] At present, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50
Inventor 张跃尹艳萍刘邦武齐俊杰廖庆亮秦子李占强蒋壹桥
Owner UNIV OF SCI & TECH BEIJING
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