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Porous electrode of solid oxide fuel cell of asymmetric structure and its preparing method

A solid oxide, asymmetric structure technology, used in battery electrodes, structural parts, circuits, etc., can solve the problems of the material surface affecting the pore structure, increasing the difficulty of preparation, and the uncertainty of the pore structure of the anode matrix, and achieving uniform thickness. Effect

Inactive Publication Date: 2004-02-11
谭小耀
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore structure of the anode substrate obtained in this way mainly depends on the content of the added binding agent and porogen and their distribution in the material. To make the anode substrate obtained in this way have the above-mentioned asymmetric structure, it is best The commonly used method is to modify the surface of the porous electrode before preparing the electrolyte membrane, which will inevitably increase the difficulty of preparation and increase the preparation cost of the battery.
Moreover, in the process of preparing the anode substrate by the pressing method, the inhomogeneity of the material surface will also affect the pore structure, and these factors will also lead to the uncertainty of the pore structure of the anode substrate obtained, which is a serious defect in the prior art

Method used

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  • Porous electrode of solid oxide fuel cell of asymmetric structure and its preparing method
  • Porous electrode of solid oxide fuel cell of asymmetric structure and its preparing method
  • Porous electrode of solid oxide fuel cell of asymmetric structure and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Example 1 Asymmetric Porous Al 2 o 3 Membrane preparation

[0061] Raw material Al 2 o 3 It is commercial activated alumina powder, particle size <300 mesh.

[0062] Using polysulfone as polymer, N-methylpyrrolidone as solvent and PVP K-90 as additive, prepare Al 2 o 3 - Polymer slurry, wherein the weight ratio of each component is: Al 2 o 3 Powder 55%, polymer 10%, solvent 34%, additive 1%. After fully stirring evenly, put it into a vacuum bottle and carry out vacuum degassing treatment for 12 hours. The slurry was poured into a stainless steel mold after degassing, and the surface of the slurry was scraped flat with a blade, and left to stand for 5 minutes, and then immersed in a water bath at 27° C. together with the mold. Let stand for 48 hours, changing the water twice during the period. Finally wash with water. Put the washed electrolyte substrate in an electric furnace and treat it at 600° C. for 4 hours to burn off the organic matter therein. Then tr...

Embodiment 2

[0063] Example 2 Preparation of Asymmetric Porous Electrode

[0064] Ce was first prepared by the sol-gel method 0.9 Gd 0.1 o 1.95 (CGO) Electrolyte powder: Weigh Ga according to the stoichiometric ratio of metal ions in CGO products 2 o 3 and Ce(NO 3 ) 3 ·6H 2 O, the Ga 2 o 3 with HNO 3 Dissolved with Ce(NO 3 ) 3 Mix the aqueous solution, add a certain amount of glycine or citric acid as a gelling agent, stir to dissolve completely, and adjust the pH value of the solution with ammonia water as needed. Heating to 60-80°C under stirring, and keeping the reaction at this temperature and continuously evaporating excess water, finally obtaining a light yellow transparent sol. The sol was heated to form a gel until it spontaneously ignited, resulting in a very fluffy product. After the product is collected, put it into an electric furnace for sintering for 4 hours, and then lower the temperature at a rate of 1°C / min to achieve the oxygen balance in the product. The el...

Embodiment 3

[0066] Example 3 Preparation of Porous Electrode for Solid Oxide Fuel Cell with Asymmetric Structure

[0067] The preparation process comprises the following process steps:

[0068] The electrode matrix is ​​prepared by phase inversion method, wherein:

[0069] Organic polymer is polysulfone or polystyrene; dissolved in organic solvent ethanol or N,N-dimethylacetamide, adding dispersant polyacrylic acid or polyacrylate; plasticizer is polyethylene glycol or polyglycerol , to make a polymer solution, the polymer content in the solution is 30%, the content of the dispersant is 1%, and the content of the plasticizer is 3%; add electrode material powder to it, fully stir to form a suspension polymerization In the polymer slurry, the weight ratio of the electrode material powder to the polymer is 20:1; the slurry is put into the mold for molding, the slurry is put into the mold for molding, and immersed in the condensate methanol at 15-20°C together with the mold , solidified to ...

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Abstract

This invention relates to a preparation method of an asymmetrical solid oxide fuel battery. Micropores of the matrix are asymmetrical and the aperture decreases progressively along the matrix thickness direction. The preparation method: dissolving organic polymers in a solvent added by dispersing agent. Plasticizer and electrolyte material powders mixed by ceramic electrolyte and Nio to be mixed to a suspending state to be immersed into condensate liquid together with a die to be solidized to get the matrix, and to burn out organic compounds for 400~600deg.c / 1í½3h, to be sintered to get porous electrodes at 1200í½1500deg.c / 4í½20h.

Description

technical field [0001] The invention belongs to the category of fuel cells, and specifically relates to a porous electrode of a solid oxide fuel cell with an asymmetric structure and a preparation method thereof, and can also be used for preparing porous ceramic membranes and ceramic membrane reactors. technical background [0002] Solid oxide fuel cell (SOFC) has attracted more and more attention due to its advantages of high energy conversion efficiency, no corrosion, easy realization of combined heat and electricity supply, and little environmental pollution, and has become an energy technology developed by various countries. one. At present, the solid oxide fuel cell is mainly made of YSZ as the electrolyte matrix, and the cathode and the anode are coated on both sides respectively. Such a battery needs to be operated at a high temperature of nearly 1000 ° C, and the requirements for the battery material are very strict. The preparation and operation costs Both are very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 谭小耀孟波杨乃涛
Owner 谭小耀