Scandium-cerium co-doped zirconium oxide powder and preparation method thereof

A technology of zirconia powder and powder, which is applied in the field of solid oxide fuel cells, can solve the problems such as unsuitable casting process, and achieve the effects of good sintering, good dispersion and good sintering activity

Inactive Publication Date: 2015-03-04
SUZHOU HUA TSING POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tape-casting process is widely used in the batch preparation of SOFC electrolyte films, and the nano-powders prepared by this process have a large specific surface area, which is not suitable for the tape-casting process, so the process needs to be rationally optimized To obtain 10Sc1CeSZ powder with suitable specific surface area and good sintering activity

Method used

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  • Scandium-cerium co-doped zirconium oxide powder and preparation method thereof
  • Scandium-cerium co-doped zirconium oxide powder and preparation method thereof
  • Scandium-cerium co-doped zirconium oxide powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of mixed salt solution: the chemical composition of the synthesized 10Sc1CeSZ powder is (Sc 2 o 3 )0.1(CeO 2 )0.01 (ZrO 2 )0.89, take by weighing 2290.37g of ZrOCl according to its composition requirements 2 ·8H 2 O, 34.68g of Ce(NO 3 ) 3 ·xH 2 O and 369.02g of Sc(NO 3 ) 3 Dissolved in 44L water, making ZrO 2+ The ion concentration is 0.1mol / L, and PEG400 and PEG6000 are added therein as (non-ionic) surfactants, the mass of which is 1% and 0.5% of the mass of the generated hydroxide precursor, and stirred to fully dissolve it.

Embodiment 2

[0039] Precipitant solution preparation: according to ZrOCl 2 ·8H 2 O, Ce(NO 3 ) 3 ·xH 2 O and Sc(NO 3 ) 3 1.5 times of the required ammonia stoichiometric ratio for precipitation reaction takes by weighing 2.2L concentrated ammonia water (25%-28%, density 0.9g / cm 3 ), add surfactant ammonium polyacrylate (NH 4 PPA), stir and mix evenly, then the concentration of ammonia water is diluted to about 2.5%.

Embodiment 3

[0041] Formation of precursor precipitation: under strong stirring, slowly pour the mixed salt solution obtained in Example 1 into the precipitant solution obtained in Example 2, and continuously increase the stirring speed to prevent uneven mixing of the solution, and the precipitation reaction ends Then continue to stir at high speed for 0.5h to ensure uniform mixing, so that the precipitation reaction is more complete, and then stand for aging.

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Abstract

A disclosed preparation method for a scandium-cerium co-doped zirconium oxide powder comprises the following steps: A, preparing a mixed salt solution; B, preparing a precipitating-agent solution; C, generating a precursor precipitate; D, post-processing the precursor precipitate; and E, post-processing the scandium-cerium co-doped zirconium oxide powder. The scandium-cerium co-doped zirconium oxide powder prepared by using the preparation method has the advantages of relatively simple operation technology, uniform particle size distribution of the prepared powder, relatively good sintering activity, low cost and the like, and therefore the technology is suitable for large-scale production of the scandium-cerium co-doped zirconium oxide powder.

Description

technical field [0001] The invention relates to the field of solid oxide fuel cells, in particular to scandium and cerium mixed-doped zirconia powder used for solid oxide fuel cell electrolytes and a preparation method thereof. Background technique [0002] Undoped ZrO 2 It is non-conductive, and changes from monoclinic phase to tetragonal phase and cubic phase with the increase of temperature, accompanied by volume change. However, doping ZrO with divalent or trivalent oxides 2 , a stable cubic or tetragonal phase can be obtained at room temperature, and at the same time when using low-valence ions Sc 3+ or Y 3+ Substitution of ZrO 2 Zr in 4+ In order to maintain electrical neutrality, corresponding positively charged oxygen vacancies are formed in the crystal. It is the oxygen vacancies formed in this way that lead to the equivalent ion conductivity of zirconia, and thus are widely used as SOFC electrolyte materials. [0003] In doped zirconia-based electrolytes, Sc ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
Inventor 韩敏芳杜晓佳丁佐龙黄彭年
Owner SUZHOU HUA TSING POWER SCI & TECH
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