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Method for preparing composite oxides mischcrystal jelly glue with gadolinium oxide adulterating cerium oxide

A composite oxide, cerium oxide technology, applied in solid electrolyte fuel cells, electrochemical generators, final product manufacturing, etc., can solve problems such as unavoidable, and achieve the effects of improving sintering activity, simple preparation process, and low reaction temperature

Inactive Publication Date: 2009-10-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also difficult to avoid the above problems when preparing electrolyte membranes for solid oxide fuel cells

Method used

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  • Method for preparing composite oxides mischcrystal jelly glue with gadolinium oxide adulterating cerium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a composite oxide solid solution gel of gadolinium oxide doped cerium oxide, which comprises the following steps:

[0027] 1) Selection of raw materials: each raw material is weighed according to the following weights: acetylacetone cerium hydrate [Ce(CH) 3 COCHCOCH 3 ) 3 ·3H 2 O] 1.554g, gadolinium acetylacetonate [Gd(CH 3 COCHCOCH 3 ) 3 ·3H 2 O] 0.355g, methanol 25.37g, N,N-dimethylformamide 0.415g; Described methanol, N,N-dimethylformamide are analytically pure, and the purity is greater than 98wt%;

[0028] 2) Add acetylacetonate cerium hydrate [Ce(CH) to the three-necked flask equipped with electromagnetic stirring. 3 COCHCOCH 3 ) 3 ·3H 2 O], gadolinium acetylacetonate hydrate [Gd(CH 3 COCHCOCH 3 ) 3 ·3H 2 O], methanol and N,N-dimethylformamide, stirred at room temperature for 1.5 hours (without adding deionized water);

[0029] 3) Pour the stable and clear sol solution into a glass petri dish, cover the petri dish, put it int...

Embodiment 2

[0034] The preparation method is the same as that of Example 1, except that the non-deionized water in step 2) of Example 1 is replaced with 0.315 g of deionized water. The test results of its basic physical properties are shown in Table 1.

Embodiment 3

[0036] A preparation method of a composite oxide solid solution gel of gadolinium oxide doped cerium oxide, which comprises the following steps:

[0037] 1) Selection of raw materials: each raw material is weighed according to the following weights: acetylacetone cerium hydrate [Ce(CH) 3 COCHCOCH 3 ) 3 ·3H 2 O] 1.554g, gadolinium acetylacetonate [Gd(CH 3 COCHCOCH 3 ) 3 ·3H 2 O] 0.355g, methanol 25.37g, N,N-dimethylformamide 0.415g, deionized water 0.315g; the methanol and N,N-dimethylformamide are analytically pure, and the purity is greater than 98wt%;

[0038] 2) Add acetylacetonate cerium hydrate [Ce(CH) to the three-necked flask equipped with electromagnetic stirring. 3 COCHCOCH 3 ) 3 ·3H 2 O], gadolinium acetylacetonate hydrate [Gd(CH 3COCHCOCH 3 ) 3 ·3H 2 O], methanol and N,N-dimethylformamide, add deionized water and stir at room temperature for 1 hour;

[0039] 3) Pour the stable and clear sol solution into a glass petri dish, cover the petri dish, put i...

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Abstract

The present invention relates to a method for preparing composite oxides mischcrystal jelly glue with gadolinium oxide adulterating cerium oxide. The method has characteristics of including steps as follows: (1) selecting raw material: weighing each raw material by weight part as follows: acetylacetone cerium aqua compound 1.5-2.5, acetylacetone gadolinium aqua compound 0.35-0.45, methanol 20-30, N, N-dimethylformamide 0.3-0.5; (2) mixing in room temperature and stirring 40-60 minutes, obtaining the colloidal solution; (3) gelating the colloidal solution in 45-70 DEG C and dehydrating dealcoholize 8-30 hours; (4) when the colloidal solution becomes viscous, the gelating reaction continues 40-60 minutes for obtaining jelly glue; (5) displacing the jelly glue to a vacuum drying case, vacuum drying 1-2 hours in 130 DEG C, and obtaining the composite oxides mischcrystal jelly glue with gadolinium oxide adulterating cerium oxide. The product has high denseness and low jelly glue porosity which is benefit for low temperature sintering into a gadolinium oxide adulterating cerium oxide electrolytes film with compact and high density.

Description

technical field [0001] The invention relates to a preparation method of a composite oxide solid solution gel containing gadolinium and cerium. Such composite oxide solid solution gels can be used as electrolytes for solid oxide fuel cells. Background technique [0002] Cerium oxide is an important compound in the rare earth family, and has attracted much attention for its excellent oxygen storage performance and high dispersion of supported metals. The conductivity of pure cerium oxide is not high, and the ionic conductivity at 600°C is only 10 -5 s / cm. But after doping, its oxygen ion conductivity will be greatly improved. The ionic conductivity of gadolinia doped ceria (GDC) at moderate temperature (500-700°C) is 1-2 orders of magnitude higher than that of zirconia (YSZ), which is a traditional electrolyte material for solid oxide fuel cells. It is an ideal electrolyte material for medium and low temperature solid oxide fuel cells. The primary requirement for the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/1246H01M8/126
CPCY02E60/523Y02E60/50Y02P70/50
Inventor 沈春晖
Owner WUHAN UNIV OF TECH
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