Composite zirconia powder for solid oxide fuel cell and preparation method of composite zirconia powder

A solid oxide and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as difficult industrial production, agglomeration of zirconia powder, strong mechanical properties, etc., and achieve high powder activity, less agglomeration, The effect of uniform particle size distribution

Active Publication Date: 2017-12-15
SANXIANG ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In general, a lot of research has been done on zirconia for solid oxide fuel cells at home and abroad, mainly including YSZ and ScSZ, as well as stable zirconia doped with a third phase, and some preparation methods are limited to laboratories. Or small-scale preparation, it is difficult to form industrial production; zirconia powder prepared by some methods has problems such as serious agglomeration and difficult sintering; electrolyte materials prepared by zirconia powder prepared by some methods cannot meet the requirements of high conductivity and strong mechanical properties at the same time

Method used

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  • Composite zirconia powder for solid oxide fuel cell and preparation method of composite zirconia powder

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preparation example Construction

[0021] A preparation method for composite zirconia powder for solid oxide fuel cells, comprising the steps of:

[0022] Step 1, preparing zirconium oxychloride aqueous solution with zirconium oxychloride concentration of 0.5-1.5mol / L, heating to 70°C; 2 o 3 , Y 2 o 3 Dissolve in zirconium oxychloride aqueous solution heated to 70°C, Sc 2 o 3 The content is 1-7mol%, Y 2 o 3 The content is 1-7mol%;

[0023] Step 2, add composite oxide additive and PEG dispersant in step 1 gained solution, described composite oxide additive is made of Al 2 o 3 、TiO 2 , CeO 2 、 Bi 2 o 3 , Li 2 O composition, the mass fraction range of each component of the composite oxide additive in the total system is 0.2-5wt.%, and the mass fraction of the PEG dispersant in the total system is 0.2-0.5wt.%.

[0024] Step 3, add urea to the resultant in step 2 under stirring, the mass fraction of urea in the total system is 5-10wt.%, and then slowly add ammonia water to adjust the pH value of the sy...

Embodiment 1

[0032] A method for preparing composite zirconia powder for solid oxide fuel cells, the specific steps of which are:

[0033] (1) Weigh zirconium oxychloride and add deionized water to prepare an aqueous solution with a concentration of 1mol / L, heat to 70°C, and 2 o 3 , Y 2 o 3 Dissolved in zirconium oxychloride solution, the Sc 2 o 3 The content is 3mol%, the Y 2 o 3 The content is 7mol%, add composite oxide additive, composite oxide additive consists of Al 2 o 3 、TiO 2 , CeO 2 、 Bi 2 o 3 , Li 2 O composition, the mass fraction of the total system is 4wt.%, where Al 2 o 3 The addition amount is 1.5wt.%, TiO 2 The addition amount is 0.5wt.%, CeO 2 The addition amount is 0.5wt.%, Bi 2 o 3 The addition amount is 1wt.%, Li 2 O addition is 0.5wt.%, adding 0.2wt.% PEG dispersant;

[0034] (2) Slowly add urea under stirring, the mass fraction of urea in the total system is 5wt.%, slowly add ammonia water, hydrolyze and precipitate, and adjust the pH value of the ...

Embodiment 2

[0040] A method for preparing composite zirconia powder for solid oxide fuel cells, the specific steps of which are:

[0041] (1) Weigh zirconium oxychloride and add deionized water to prepare an aqueous solution with a concentration of 1mol / L, heat to 70°C, and 2 o 3 , Y 2 o 3 Dissolved in zirconium oxychloride solution, the Sc 2 o 3 The content is 5mol%, the Y 2 o 3 The content is 5mol%, add composite oxide additive, composite oxide additive consists of Al 2 o 3 、TiO 2 , CeO 2 、 Bi 2 o 3 , Li 2 O composition, the mass fraction of the total system is 5wt.%, where Al 2 o 3 The addition amount is 2wt.%, TiO 2 The addition amount is 1wt.%, CeO 2 The addition amount is 0.5wt.%, Bi 2 o 3 The addition amount is 0.5wt.%, Li 2 The amount of O added is 1wt.%, and 0.3wt.% of PEG dispersant is added;

[0042] (2) Slowly add urea under stirring, the mass fraction of urea in the total system is 7wt.%, slowly add ammonia water, hydrolyze and precipitate, and adjust the ...

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Abstract

The invention discloses composite zirconia powder for a solid oxide fuel cell and a preparation method of composite zirconia powder. The method comprises the following steps: adding a composite oxide additive and a PEG dispersing agent into a zirconium oxychloride aqueous solution, and performing precipitation, aging, filtration, washing and the like, wherein the composite oxide additive consists of Al2O3, TiO2, CeO2, Bi2O3 and Li2O; each component of the composite oxide additive accounts for 0.2 to 5 weight percent of the total system; a solid oxide fuel cell electrolyte piece which is prepared from the composite zirconia powder prepared by the method has the conductivity of 0.37 s / cm at 800 DEG C and the bending strength Kf of greater than 580 MPa; the application of serving as a high-performance electrolyte material in the solid oxide fuel cell can be met, and moreover, the preparation method disclosed by the invention has the characteristics of few aggregates, small particle sizes, uniform particle size distribution, high powder activity, safety and convenience in operation and the like, and is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the field of production methods of solid oxide fuel cells, in particular to composite zirconia powder for solid oxide fuel cells and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cells (Solid Oxide Full Cells, SOFC) is an efficient and clean energy conversion system, which can directly convert the chemical energy of fuel gas and oxidizing gas into electrical energy, and has high power generation efficiency and fast response speed. With the advantages of small size, low pollution, easy assembly and maintenance, etc., it is known as a high-efficiency, energy-saving and environmentally friendly power generation technology after hydropower, thermal power and nuclear power. The development and application of SOFC has become a research hotspot in the field of new materials and new energy. [0003] The electrolyte material is the key component of SOFC. At present, most SOFCs use 5-10mol% yttria-stabiliz...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/622H01M8/1253
CPCC04B35/48C04B35/622C04B2235/3203C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/3232C04B2235/3298C04B2235/96H01M8/1253Y02E60/50Y02P70/50
Inventor 胡天喜叶旦旺包晓刚李小毅叶海龙颜玉萍
Owner SANXIANG ADVANCED MATERIALS
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