Preparation for high-performance solid oxidate electrolytic cell perovskite oxygen electrode powder

A solid oxide and oxygen electrode technology, applied in electrolysis process, electrolysis components, etc., can solve the problems of inaccurate product stoichiometric ratio, complex condition control, metal ion segregation, etc., and achieve accurate stoichiometric ratio and high product specific surface area , active effect

Inactive Publication Date: 2008-10-01
TSINGHUA UNIV
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Problems solved by technology

The solid-phase method uses high-temperature sintering, which has the disadvantages of high operating temperature, long holding time, large product particles, easy introduction of impurities, and low specific surface area; liquid-phase methods include coprecipitation method, sol-gel method, citric acid method, etc., these Although the method can reduce the phase formation temperature of powder materials to a certain extent and prepare oxide powders with high specific surface area, these methods have complex condition control, inaccurate stoichiometric ratio of products, long sintering time and easy occurrence of metal ions Disadvantages such as segregation

Method used

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  • Preparation for high-performance solid oxidate electrolytic cell perovskite oxygen electrode powder
  • Preparation for high-performance solid oxidate electrolytic cell perovskite oxygen electrode powder
  • Preparation for high-performance solid oxidate electrolytic cell perovskite oxygen electrode powder

Examples

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Effect test

example 1

[0024] Example 1: Nanoscale perovskite oxygen electrode material Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 (BSCF) powder preparation

[0025] Preparation of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 The solution and reagents were of analytical grade, dissolved in deionized water, and constant volume in a volumetric flask; Sr(NO 3 ) 2 , Co(NO 3 ) 2 and Fe(NO 3 ) 3 The concentration was accurately calibrated by EDTA complexometric titration, Ba(NO 3 ) 2 The concentration was calibrated by gravimetric method. Accurately pipette Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 solution, mix and stir evenly; take citric acid according to the ratio of citric acid: metal ion is 2: 1, add appropriate amount of water to dissolve and stir, add in the mixed solution of metal ion, stir and mix evenly in 80 ℃ water bath; according to ammonium nitrate: citric acid is Add solid ammonium nitrate at a ratio of 2:1, stir and add the mixed solution, and stir in a wa...

example 2

[0030] Example 2: Perovskite Oxygen Electrode Material La 0.5 Sr 0.5 co 0.8 Fe 0.2 (LSCF) powder preparation

[0031] Preparation of Sr(NO 3 ) 2 , La(NO 3 ) 3 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 The solutions and reagents were all of analytical grade and dissolved in deionized water; high-purity La was dissolved in nitric acid 2 o 3 The method of preparing La(NO 3 ) 3Solution, constant volume in volumetric flask; La(NO 3 ) 3 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 and Fe(NO 3 ) 3 The concentration of the concentration is accurately calibrated by the EDTA complexometric titration method; the La(NO 3 ) 3 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 solution, mix and stir evenly; take citric acid according to the ratio of citric acid: metal ion is 2: 1, add appropriate amount of water to dissolve and stir, add in the mixed solution of metal ion, stir and mix evenly in 80 ℃ water bath; according to ammonium nitrate: citric acid is Add solid ammonium nitrate at a ratio of 2:...

example 3

[0032] Example 3: Perovskite Oxygen Electrode Material Pr 0.5 Sr 0.5 co 0.8 Fe 0.2 (PSCF) powder preparation

[0033] Preparation of Sr(NO 3 ) 2 , Pr(NO 3 ) 4 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 The solution and reagents were of analytical grade, dissolved in deionized water; constant volume in a volumetric flask; Pr(NO 3 ) 4 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 and Fe(NO 3 ) 3 The concentration of the concentration is accurately calibrated by the EDTA complexometric titration method; the Pr(NO 3 ) 4 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 , Fe(NO 3 ) 3 solution, mix and stir evenly; take citric acid according to the ratio of citric acid: metal ion is 2: 1, add appropriate amount of water to dissolve and stir, add in the mixed solution of metal ion, stir and mix evenly in 80 ℃ water bath; according to ammonium nitrate: citric acid is Add solid ammonium nitrate at a ratio of 2:1, stir and add the mixed solution, and stir in a water bath at 80°C for about an hour; transfer the solu...

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Abstract

The invention belongs to the high-temperature water vapor electrolyzing hydrogen preparation field, in particular to relating a preparation method of high performance solid oxide electrolytic cell oxygen electrode material. The method uses metal nitrate with the weight ratio of 5wt% to 30wt%, citric acid with the weight ratio of 1wt% to 10wt%, ammonium nitrate with the ratio percentage of 1wt% to 10wt%, ammonia with the weight ratio of 5wt% to 20wt% and deionized water with the weight ratio of 50wt% to 80wt% as raw material, and adopts a low-temperature self-propagating method to effectively prepare the powder. Firstly a plurality of metal nitrate solutions needed by the special oxygen electrode material are demarcated and prepared according to stoichiometric ratio, and after the metal nitrate solutions are mixed and stirred uniformly, incendiary agent citric acid and combustion improver ammonium nitrate are added, and ph value of the solutions is adjusted to the range of 7 to 9 by using the ammonia, and the mixed solution is evaporated till the solution changes into jelly, and then the jelly is heated continuously till the low-temperature self-propagating combustion is initiated to gain a first powder, then the first powder is processed heat treatment again to gain the aim powder. The method has the advantages of low operation temperature, high product ratio surface area, uniformed granularity, small average particle size, good sintering temperature activity, exact stoichiometric ratio and so on.

Description

technical field [0001] The invention belongs to the field of hydrogen production by high-temperature steam electrolysis, and in particular relates to a method for preparing a perovskite oxygen electrode powder for a high-performance solid oxide electrolytic cell. Background technique [0002] The high-temperature steam electrolysis hydrogen production technology uses a solid oxide high-temperature electrolytic cell to decompose water vapor into hydrogen and oxygen, and its theoretical hydrogen production efficiency can be as high as 50%. It is the most efficient large-scale hydrogen production technology that has been realized so far. The high-temperature solid oxide electrolytic cell is a high-efficiency, low-pollution energy conversion device. The development of high-performance oxygen electrode materials is one of the core issues in the development of high-temperature solid oxide electrolytic cells. The performance of the oxygen electrode material is closely related to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04
CPCY02E60/366Y02E60/36
Inventor 于波张文强陈靖徐景明
Owner TSINGHUA UNIV
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