Method for improving sintering activity of cerium oxide doped electrolyte

A technology for sintering activity and cerium oxide, which is applied in the field of improving the sintering activity of doped cerium oxide electrolytes, can solve the problems of sintering obstacles, obstacles, and difficulty in promoting the transport of cerium oxide materials, and achieves the effect of improving electrical conductivity and expanding the selection range.

Active Publication Date: 2019-03-08
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When selecting SrO, Sr(NO 3 ) 2 In terms of Sr-containing compounds, the classic literature C (Journal of Power Sources, 157 (2006) 688) adopts a content range of 2mol% to 6mol%, and compares sintering aids containing elements such as Sr, Co, Cu, Fe, Ni, La, etc. After the sintering effect on doped ceria, it is clearly pointed out that SrO has no sintering effect on doped ceria, but only hinders sintering. The reason is that the radius of Sr ions reaches 0.140nm, while the radius of Ce ions in cerium oxide Only 0.111nm, the radius difference is too large,

Method used

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  • Method for improving sintering activity of cerium oxide doped electrolyte
  • Method for improving sintering activity of cerium oxide doped electrolyte

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0021] Example 1

[0022] Preparation of Ce containing 0.05mol% SrO sintering aid 0.8 Sm 0.2 O 1.9 Electrolyte material.

[0023] First, weigh 347.378g of Ce(NO 3 ) 3 ·6H 2 O, 88.893g of Sm(NO 3 ) 3 ·6H 2 O, 0.106g of Sr(NO 3 ) 2 , Dissolve in deionized water and prepare a metal ion solution with a concentration of 1mol / L in a 1L volumetric flask.

[0024] Then, weigh 124.10g of (NH 4 ) 2 C 2 O 4 , Dissolve in deionized water and prepare a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0025] Then, take 100 ml of the above metal ion solution and drop it into 500 ml of the above ammonium oxalate solution under stirring for co-precipitation. During the precipitation reaction, ammonia water is used to control the pH between 6.5 and 6.8.

[0026] Then, the composite powder obtained by the co-precipitation is centrifuged from the solution, the precipitate is taken out, and washed with deionized water and ethanol to obtain the precursor powder.

[0027] Then, the precursor powder...

Example Embodiment

[0029] Example 2

[0030] Preparation of Ce containing 0.5mol% SrO sintering aid 0.8 Sm 0.2 O 1.9 Electrolyte material.

[0031] First, weigh 347.378g of Ce(NO 3 ) 3 ·6H 2 O, 88.893g of Sm(NO 3 ) 3 ·6H 2 O, 1.058g of Sr(NO 3 ) 2 , Dissolve in deionized water and prepare a metal ion solution with a concentration of 1mol / L in a 1L volumetric flask.

[0032] Then, weigh 124.10g of (NH 4 ) 2 C 2 O 4 , Dissolve in deionized water and prepare a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0033] Then, take 100 ml of the above metal ion solution and drop it into 500 ml of the above ammonium oxalate solution under stirring for co-precipitation. During the precipitation reaction, ammonia water is used to control the pH between 6.5 and 6.8.

[0034] Then, the composite powder obtained by the co-precipitation is centrifuged from the solution, the precipitate is taken out, and washed with deionized water and ethanol to obtain the precursor powder.

[0035] Then, the precursor powder ...

Example Embodiment

[0037] Example 3

[0038] Preparation of Ce containing 5mol% SrO sintering aid 0.8 Sm 0.2 O 1.9 Electrolyte material.

[0039] First, weigh 347.378g of Ce(NO 3 ) 3 ·6H 2 O, 88.893g of Sm(NO 3 ) 3 ·6H 2 O, 10.581g of Sr(NO 3 ) 2 , Dissolve in deionized water and prepare a metal ion solution with a concentration of 1mol / L in a 1L volumetric flask.

[0040] Then, weigh 124.10g of (NH 4 ) 2 C 2 O 4 , Dissolve in deionized water and prepare a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0041] Then, take 100 ml of the above metal ion solution and drop it into 500 ml of the above ammonium oxalate solution under stirring for co-precipitation. During the precipitation reaction, ammonia water is used to control the pH between 6.5 and 6.8.

[0042] Then, the composite powder obtained by the co-precipitation is centrifuged from the solution, the precipitate is taken out, and washed with deionized water and ethanol to obtain the precursor powder.

[0043] Then, the precursor powder i...

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Abstract

The invention discloses a method for improving the sintering activity of cerium oxide doped electrolyte. Specifically, SrO is added into cerium oxide doped electrolyte powder. The relative content ofthe SrO in the cerium oxide doped electrolyte is in a range of 0.05 mol percent to 0.5 mol percent. The method disclosed by the invention can remarkably improve the sintering activity of the cerium oxide doped electrolyte, and meanwhile can further improve the electrical conductivity of the electrolyte.

Description

technical field [0001] The invention belongs to the field of solid electrolyte materials and relates to a method for improving the sintering activity of doped cerium oxide electrolyte. Background technique [0002] Doped cerium oxide is an important type of electrolyte material, which is used in solid oxide fuel cells, sensors and other fields, but its sintering performance is poor, and it generally requires a higher temperature to obtain a dense sintered body, resulting in complex preparation process and cost. improve. In order to improve the sintering activity of doped ceria, a sintering aid can usually be added therein. Document A (Journal of Power Sources, 162 (2006) 480) and Document B (Ceramics International, 41 (2015) 4161) used sintering aids containing Cu and Co elements, and the amount added to doped cerium oxide was 1 mol % to 2.5 mol%, the sintering temperature of the doped cerium oxide material can be significantly reduced, and the sintering activity can be im...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622C04B35/64
CPCC04B35/50C04B35/622C04B35/64C04B2235/3213C04B2235/3224
Inventor 李宝光张诚然刘良禄戴欢李阳李海滨白露吴笑婕周公文
Owner YUNNAN UNIV
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