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Solid-oxide fuel battery complex cathode and method for making same

A solid oxide, fuel cell technology, applied in fuel cell parts, battery electrodes, circuits, etc., can solve problems such as poor long-term stability of cathodes with high activity, and achieve the effects of easy to master, simple preparation process, and improved performance

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a solid oxide fuel cell composite cathode and its preparation method to solve the problems of high cathode activity and poor long-term stability of the cathode, thereby obtaining a cathode with both high activity and long-term stability

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: Preparation of solid oxide fuel cell LSC-SDC composite cathode by co-firing impregnation

[0033] (1) Electrolyte SDC (Sm 0.2 Ce 0.8 0 1.9 ) powder: put the Ce calibrated in advance 2+ 、Sm 3+ The nitrate solution was mixed stoichiometrically, keeping the molar ratio of Ce and Sm at 4:1 to form the nitrate precursor Sm 0.2 Ce 0.8 (NO 3 ) x , then add a certain amount of glycine, the molar ratio of glycine to nitrate ion is 1:2, dissolve, stir for 1 hour, after mixing evenly, take about 0.02mol of Sm each time 0.2 Ce 0.8 (NO 3 ) x The nitrate solution was placed in a 1000mL beaker, heated on a 500W electric hot plate, and the excess water was evaporated. At this time, the solution becomes viscous, continue to heat, the jelly starts to fuel, and emits light yellow powder, which is collected as electrolyte SDC powder. These powders were heat treated at 800°C for 2 hours to obtain the desired electrolyte SDC powder.

[0034] (2) Preparation of the ele...

Embodiment 2

[0045] Example 2: Preparation of solid oxide fuel cell YSZ-LSM composite cathode by co-firing impregnation

[0046] (1) Electrolyte YSZ (8mol% Y 2 o 3 -ZrO 2 ) powder: the pre-calibrated Y 3+ 、Zr 4+ The nitrate solution was mixed stoichiometrically, keeping the molar ratio of Y and Zr at 0.16:0.92 to form the nitrate precursor Y 0.16 Zr 0.92 (NO 3 ) x , then add a certain amount of glycine, the molar ratio of glycine and nitrate ions is 1:2, dissolve, stir for 1 hour, after mixing evenly, take about 0.02mol of Y each time 0.16 Zr 0.92 (NO 3 ) x The nitrate solution was placed in a 1000mL beaker, heated on a 500W electric hot plate, and the excess water was evaporated. At this time, the solution becomes viscous, continue to heat, the gel starts to fuel, and emits light white powder, which is collected as electrolyte YSZ powder. These powders were heat treated at 1000°C for 2 hours to obtain the desired electrolyte YSZ powder. The powder preparation process is the s...

Embodiment 3

[0054] Example 3: Preparation of solid oxide fuel cell GDC-SSC composite cathode by co-firing impregnation

[0055] (1) Electrolyte GDC (Gd 0.1 Ce 0.9 o 1.95 ) powder: put the Ce calibrated in advance 2+ 、Gd 3+ The nitrate solution was mixed stoichiometrically, keeping the molar ratio of Ce and Gd at 9:1 to form the nitrate precursor Gd 0.1 Ce 0.9 (NO 3 ) x , then add a certain amount of glycine, the molar ratio of glycine and nitrate ions is 1:2, dissolve, stir for 1 hour, after mixing evenly, take about 0.02mol of Gd each time 0.1 Ce 0.9 (NO 3 ) x The nitrate solution was placed in a 1000mL beaker, heated on a 500W electric hot plate, and the excess water was evaporated. At this time, the solution becomes viscous, continue to heat, the jelly starts to fuel, and emits white powder, which is collected as electrolyte GDC powder. These powders were heat-treated at 900°C for 2 hours to obtain the desired electrolyte GDC powder.

[0056] (2) Preparation of the electro...

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Abstract

The invention relates to the solid fuel battery technology area, specifically relates to a composit cathode of solid oxide compound fuel cell with high stable and its preparation method. The composit cathode includes the negative pole material thin film which is composed by nanometer level spheroidal particle whose diameter is the 50-100nm the and the electrolyte basis, electrolyte basis thickness is 0.7-1mm, the negative pole material thin film quality / ( the quality of negative pole material thin film + the quality of porous electrolyte skeleton) =50%-55%. The preparation method is that first prepares electrolyte powder body by the metal nitrate forerunner body, and forms the basis and the pulp, prints the pulp on the basis drtying, heating to obtain the porous three dimensional electrolyte skeleton, soaks the negative pole material forerunner body solution to the skeleton, puts heat treatment 2-3 hours under the 700-900deg.C , soaks the heat treatment cycle operation many times. The composit cathode has the very good electrochemistry performance.

Description

technical field [0001] The invention relates to the technical field of solid fuel cells, in particular to a high-stability solid oxide fuel cell composite cathode and a preparation method thereof. Background technique [0002] Fuel cell (FC) is a new secondary energy device in the 21st century. It is a high-tech solution to the dual problems of low energy utilization efficiency and environmental pollution, and an effective means to maintain the sustainable development of human civilization. Since the solid oxide fuel cell (SOFC) has the highest energy utilization efficiency among all fuel cells, which can reach 90%, and the power generation efficiency can also be as high as 70%, so there is great competition in the power system and transportation system that consume a lot of energy. , and its application potential is great. At present, high-temperature (800-1000°C) SOFC is more researched, but a series of problems brought about by traditional high-temperature SOFC, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/02H01M4/88
CPCY02E60/50
Inventor 夏长荣赵飞
Owner UNIV OF SCI & TECH OF CHINA
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