Method for preparing intermediate-tmeperature solid oxide electrolyte superfine powder for fuel cell

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, oxide conductors, etc., can solve problems such as agglomeration of finished powder, difficult control of preparation conditions, and segregation of metal ions

Inactive Publication Date: 2004-01-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation methods generally have problems such as difficult to control the preparation conditions, prone to segregation of metal ions, and serious agglomeration of finished powders.

Method used

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  • Method for preparing intermediate-tmeperature solid oxide electrolyte superfine powder for fuel cell
  • Method for preparing intermediate-tmeperature solid oxide electrolyte superfine powder for fuel cell
  • Method for preparing intermediate-tmeperature solid oxide electrolyte superfine powder for fuel cell

Examples

Experimental program
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Effect test

example 1

[0021] Example 1, La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ (LSGM 9182) Synthesis of Ultrafine Powder

[0022] According to the stoichiometric ratio, La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O and Ga 2 o 3 The amount of reagents, the above reagents are selected analytical grade reagents. The excess La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O is dissolved in deionized water, and the molar concentration of the metal ions of each nitrate solution is accurately calibrated by chemical analysis (such as EDTA complexometric titration), and the volume of each nitrate solution required is calculated accordingly. Press the Calculate the amount to accurately weigh Ga 2 o 3 , and then dissolved in concentrated nitric acid, because Ga 2 o 3 It is relatively insoluble, so it must be heated with stirring long enough to ensure complete dissolution. Accurately measure La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O solution, with Ga 2 o...

example 2

[0023] Example 2, La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ (LSGM9182) Determination of roasting temperature of superfine powder, detection of particle size and electrical conductivity of synthetic powder

[0024] Use the differential thermal-thermogravimetric (TG-DTA) method to measure the mass change (weight loss) and heat absorption and heat release during the roasting process of the precursor powder, and preliminarily determine the changes in the precursor during the heating process, such as figure 1 shown. Then the precursor powder was calcined at different temperatures (290°C, 390°C, 590°C, 740°C, 950°C, 1120°C, 1320°C, 1450°C) for 180min, and the phase structure of the product was determined by X-ray diffraction method. The results are as follows: figure 2 shown. Finally, the precursor powder was roasted at 1200°C and 1300°C for 180min, and the morphology and particle size of the finished LSGM powder were observed with a transmission electron microscope (TEM), as shown in ...

example 3

[0027] Example 3, Sm 0.5 Sr 0.5 CoO 3-δ Synthesis of (SSC) Superfine Powder

[0028] According to the stoichiometric ratio, the Sr(NO 3 ) 2 , Co(NO 3 ) 3 ·6H 2 O and Sm 2 o 3 The amount of reagents, the above reagents are selected analytical grade reagents. Will Co(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Dissolved in deionized water, using chemical analysis methods, such as EDTA complexometric titration, to accurately calibrate the molar concentration of metal ions in each nitrate solution, and calculate the required volume of each nitrate solution accordingly. Accurately weigh Sm according to the calculated amount with an analytical balance 2 o 3 , and then dissolved in concentrated nitric acid. Accurately measure Co(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 solution, with Sm 2 o 3 The solution obtained by dissolving in nitric acid was mixed well. Weigh EDTA acid at a ratio of 1.2:1, add ammonia water until completely dissolved. Add this solution into the mixed solution...

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Abstract

First, complexing metal ion by complexing agent, then adding organic gel-forming agent also as auxiliary complexing agent and fuel, and finally adding proper amount of NH4NO3. With being concentrated under 40-100 DEG C, the glue is heated till drastic combustion reaction similar to explode happens so as to generate superfine precursory powder of composite oxides. The method can synthesize electrolytical micropowder material possessing favorable sintering character with granularity in tens nano for solid oxide fuel cell. The method makes phasing temperature(superfine LSGM powder with granularity less then 100 nano is obtained) of La0.9 Sr0.1 Ca0.8 Mg0.2O[3-delta](LSGM9182) reduce to 1120 DEG C from 1500 DEG C by using solid state reaction method.

Description

technical field [0001] The invention relates to a method for preparing fuel cell electrolyte superfine powder, in particular to a method for preparing medium temperature solid oxide fuel cell electrolyte superfine powder. technical background [0002] Solid Oxide Fuel Cell (SOFC) is a new green power generation technology developed rapidly in the 1980s. SOFC converts the chemical energy of the fuel directly into electrical energy, and has the advantages of not being limited by the Carnot cycle, high energy utilization rate, and environmental friendliness, which cannot be compared with other power generation technologies. The SOFC system that was first developed and also the most widely studied is a high-temperature fuel cell system that uses yttrium-stabilized zirconia (YSZ) as the electrolyte. Due to the low ionic conductivity of YSZ at low temperatures, to obtain commercially meaningful output power densities, the cells must be operated at very high operating temperatures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/08H01B13/00H01M8/126
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 阎景旺程谟杰董永来
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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