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, the introduction of SrO is difficult to promote the transport of cerium oxide substances in the sintering process, it can only play a hindering role
Another classic document D (Solid State Ionics, 178 (2007) 1187) used the famous Vegard'Slope to calculate the Vegard'Slope value of Sr ions in the cerium oxide lattice, proving the compatibility of Sr ions with the cerium oxide lattice Very poor, not easy to play a sintering aid effect
[0005] As mentioned above, the valence-stabilized SrO has been considered unsuitable as a sintering aid for cerium oxide materials.

Method used

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  • Method for improving sintering activity of cerium oxide doped electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Ce with 0.05 mol% 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 , dissolved in deionized water, and prepared as 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 , dissolved in deionized water, and prepared as a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0025] Then, take 100ml of the above-mentioned metal ion solution, drop it into 500ml of the above-mentioned ammonium oxalate solution in a stirred state, and carry out co-precipitation, and use ammonia water to control the pH value between 6.5 and 6.8 during the precipitation reaction.

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

Embodiment 2

[0030] Preparation of Ce with 0.5 mol% 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, dissolved in deionized water, and prepared as 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 , dissolved in deionized water, and prepared as a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0033] Then, take 100ml of the above-mentioned metal ion solution, drop it into 500ml of the above-mentioned ammonium oxalate solution in a stirred state, and carry out co-precipitation, and use ammonia water to control the pH value between 6.5 and 6.8 during the precipitation reaction.

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

Embodiment 3

[0038] Preparation of Ce with 5 mol% 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 , dissolved in deionized water, and prepared as 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 , dissolved in deionized water, and prepared as a 1mol / L ammonium oxalate solution in a 1L volumetric flask.

[0041] Then, take 100ml of the above-mentioned metal ion solution, drop it into 500ml of the above-mentioned ammonium oxalate solution in a stirred state, and carry out co-precipitation, and use ammonia water to control the pH value between 6.5 and 6.8 during the precipitation reaction.

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

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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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