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Three-phase conductor-proton-conductor composite cathode material and preparation method thereof

A cathode material, fuel cell cathode technology, applied in the direction of material impedance, chemical instruments and methods, suspension and porous material analysis, etc., can solve problems such as poor stability, uneven mixing of composite cathodes, insufficient active sites, etc.

Active Publication Date: 2021-08-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, conventional composite cathodes suffer from the disadvantages of uneven mixing, poor stability, and insufficient active sites, and are not suitable for low-temperature proton conductor fuel cells. Therefore, new composite methods are urgently needed to provide higher proton conductivity while providing better Oxygen Catalytic Activity

Method used

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  • Three-phase conductor-proton-conductor composite cathode material and preparation method thereof
  • Three-phase conductor-proton-conductor composite cathode material and preparation method thereof
  • Three-phase conductor-proton-conductor composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of Low Temperature Proton Conductor Solid Oxide Fuel Cell Cathode Material SSNCF0.2 in Example 1

[0062] (1) Take 1.382g of scandium trioxide and dissolve it with a certain amount of nitric acid to form a nitrate solution. Weigh 8.4652g of strontium nitrate and 10.7608g of niobium oxalate, add 50mL of deionized water, heat and stir to dissolve to a clear solution, as a metal ion solution;

[0063] (2) Weigh about 24g of ethylenediaminetetraacetic acid and about 34g of citric acid, add 62ml of ammonia water and stir until dissolved, as a complexing agent solution;

[0064] (3) Add the complexing agent solution into the metal ion solution, then dropwise add ammonia water until the pH of the solution is between 7 and 8, and then stir the water under the conditions of magnetic stirring and heating to completely evaporate the water to obtain a gel-like substance;

[0065] (4) Place the gel-like substance in an oven and calcinate at 180°C for 5 hours to obtain t...

Embodiment 2

[0069] Embodiment 2 Symmetric battery preparation

[0070] (1) The isopropanol, the ethylene glycol of 2ml, the glycerin of 0.8ml of the cathode powder SSNCF0.2, 10ml that take 1g embodiment 1 are poured into the high-energy ball mill, under the condition of 400r / min After ball milling for 30 min, the required cathode slurry was obtained after transferring to the seed bottle with a straw.

[0071] (2) Place the prepared BZCYYb and SDC electrolytes on a heating table to preheat at 200°C, use a spray gun to spray the prepared cathode slurry evenly on both sides of the electrolyte under the push of an inert gas, and wait for the liquid to evaporate completely Finally, the sprayed electrolyte was placed in a high-temperature muffle furnace and calcined at 1000°C for 2 hours to prepare the required symmetrical battery, which was used for the test of the polarization resistance of the cathode material in the temperature range of 500-700°C.

Embodiment 3

[0072] The preparation of embodiment 3 single cell

[0073] (1) The isopropanol, the ethylene glycol of 2ml, the glycerin of 0.8ml of the cathode powder SSNCF0.2, 10ml that take 1g embodiment 1 are poured into the high-energy ball mill, under the condition of 400r / min After ball milling for 30 min, the required cathode slurry was obtained after transferring to the seed bottle with a straw.

[0074] (2) Place the prepared dry-pressed battery sheet on a heating table to preheat at 200°C, and use a spray gun to spray the prepared cathode slurry evenly on the electrolyte surface of the dry-pressed sheet under the push of an inert gas. After the liquid is completely volatilized, the sprayed dry-pressed battery is placed in a high-temperature muffle furnace and calcined at 1000°C for 2 hours to obtain the required single cell, which is used for the single cell performance test of the cathode material in the temperature range of 400-650°C .

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Abstract

A cathode material with the molecular formula of Sr < 2-2x > (Sr < 2x > Sc < x > Nb < x >) Co < 1.7-2x > Fe < 0.3 > O < 6-2 delta > is prepared through a two-step method (a sol-gel method and a high-temperature solid-phase method). The performance of a single cell is improved by two optimization strategies of preparing an SSN modified main phase SCFx composite cathode with nano particle size and regulating and controlling the partial pressure of surface water vapor. Through preparation, SSNCF0.2 obtains the optimal performance, and the composite cathode material composed of a main phase perovskite phase SCFx and an additional phase SSN is obtained. In addition, SSN and SCFx are subjected to beneficial phase reaction, the perovskite structure is stabilized, and a firm phase contact interface is obtained; and moreover, a proper amount of SSN is compounded, so that the proton transmission capability of the cathode is effectively improved, a cathode bulk phase conducts protons in a long range, the reaction region of the cathode is expanded, and the performance of the cathode is greatly improved.

Description

technical field [0001] The invention relates to a novel three-phase conductor proton conductor cathode material and a preparation method thereof, and more particularly relates to a solid oxide fuel cell cathode material prepared jointly by a sol-gel method and a solid-phase method, a preparation method and application thereof. Background technique [0002] Due to the urgent need for clean energy, solid oxide fuel cells have attracted worldwide attention because of their extremely high energy conversion efficiency, diverse fuel options, clean and zero pollution. Due to its extremely high operating temperature (800-1000°C), the traditional solid oxide fuel cell has seriously hindered its large-scale industrialization. Therefore, in order to improve the stability of the fuel cell and reduce the cost of materials, the working temperature of medium and low temperature (400-700° C.) is the development trend. As the operating temperature decreases, the advantages of proton conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88C01G51/00G01N15/08G01N27/02
CPCH01M4/9033H01M4/88C01G51/68G01N27/02G01N15/08C01P2002/72C01P2004/03C01P2004/04C01P2004/61Y02E60/50
Inventor 周嵬周川刘栋良沈璇璇刘威梅伟杰杨广明邵宗平
Owner NANJING UNIV OF TECH
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