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Perovskite mixed conductor material and preparation method thereof

A cathode material, the technology of the implementation mode, applied in the field of perovskite mixed conductor material and its preparation, can solve the problems of high operating temperature, obstruction, etc.

Active Publication Date: 2019-05-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its extremely high operating temperature (800-1000 °C), the traditional solid oxide fuel cell seriously hinders the development of its large-scale industrialization.

Method used

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  • Perovskite mixed conductor material and preparation method thereof
  • Perovskite mixed conductor material and preparation method thereof
  • Perovskite mixed conductor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Composite cathode material Sr for medium and low temperature solid oxide fuel cells 2 sc 0.1 Nb 0.1 co 1.5 Fe 0.3 o 6−δ preparation of

[0049] (1) Weigh 0.0691 g of scandium oxide, add 10 mL of concentrated nitric acid, then add 40 mL of deionized water, cover with a plastic film and heat to boil until transparent and clear.

[0050] (2) Weigh 4.2326 g of strontium nitrate, 4.3655 g of cobalt nitrate, 1.212 g of ferric nitrate, and 1.1632 g of niobium oxalate, add a small amount of deionized water to dissolve and mix with scandium nitrate solution. Weigh 11.7 g of ethylenediamine tetraacetic acid and 16.8 g of citric acid hydrate as a complexing agent and dissolve them in deionized water at a molar ratio of ethylenediaminetetraacetic acid: hydrated citric acid: total metal ions of 1:2:1.

[0051] (3) After adding the solution containing complexing agent to the solution containing metal ions, add an appropriate amount of ammonia water dropwise to make th...

Embodiment 2

[0054] Example 2 Preparation of symmetrical battery

[0055] (1) Weigh 1 g of the cathode powder Sr prepared in Example 1 2 sc 0.1 Nb 0.1 co 1.5 Fe 0.3 o 6−δ , 10 ml of isopropanol, 2 ml of ethylene glycol, and 0.8 ml of glycerol were poured into a high-energy ball mill, and after ball milling at 400 r / min for 30 min, they were transferred to a strain bottle with a straw to obtain the desired Cathode slurry.

[0056] (2) Place the prepared BZCYYb electrolyte on a heating platform to preheat at 200 °C, and use a spray gun to spray the prepared cathode slurry evenly on both sides of the electrolyte under the push of an inert gas. After the liquid is completely volatilized, The sprayed electrolyte was placed in a high-temperature muffle furnace and calcined at 900 °C for 2 h to obtain the desired symmetrical battery, which was used for the cathode material at 500-700 ℃ Measurement of polarization resistance over temperature range. Among them, the battery is at 700 ℃ The ...

Embodiment 3

[0057] Example 3 Preparation of Single Cell

[0058] (1) Weigh 1 g of the cathode powder Sr prepared in Example 1 2 sc 0.1 Nb 0.1 co 1.5 Fe 0.3 o 6−δ , 10 ml of isopropanol, 2 ml of ethylene glycol, and 0.8 ml of glycerol were poured into a high-energy ball mill, and after ball milling at 400 r / min for 30 min, they were transferred to a strain bottle with a straw to obtain the desired Cathode slurry.

[0059] (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 evaporated, the sprayed dry-pressed battery is placed in a high-temperature muffle furnace and calcined at 900 °C for 2 hours to obtain the desired symmetrical battery, which is used to measure the polarization impedance of the cathode material in the temperature range of 450-650 °C. test.

[0060] C...

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Abstract

The invention relates to a novel oxygen ion, proton and electron mixed conductor solid oxide fuel cell cathode material. The composition molecular formula of the cathode material is Sr2Sc0.1Nb0.1Co1.5Fe0.3O<6-delta> (SSNCF), wherein [delta] represents the content of oxygen vacancies, and the invention belongs to the field of solid oxide fuel cell cathode materials. The cathode material also has excellent proton conductivity under the condition that the cathode material has certain oxygen ion and electron conductivity. The cathode material has proton, oxygen ion and electron mixed conductivity,so that the SSNCF has excellent electrochemical performance on a proton conductor, and correspondingly, the maximum output power at 650 DEG C is up to 840 mW.cm<-2>. Meanwhile, through a hydrogen permeation method, the hydrogen permeation performances of the two materials (SSNCF and Ba0.5Sr0.5Co0.8Fe0.2O<3-delta> (BSCF)) are compared by using an experimental method, the proton conductivity of thetwo materials is compared, and the proton conductivity of the two materials is estimated.

Description

technical field [0001] The invention relates to a perovskite mixed conductor material and a preparation method thereof, more particularly to a solid oxide fuel cell cathode material Sr prepared by a sol-gel method. 2 sc 0.1 Nb 0.1 co 1.5 Fe 0.3 o 6−δ (SSNCF) and its preparation method and application. 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 ℃), the traditional solid oxide fuel cell seriously hinders its large-scale industrialization. Therefore, in order to improve the stability of fuel cells and reduce the cost of materials, the working temperature of medium and low temperature (400-700 ℃) is the development trend. As the operating temperature decreases, the advantages of proton conductors appear. Compared with o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88C01G51/00
CPCY02E60/50
Inventor 周嵬周川杨广明何帆王纬邵宗平
Owner NANJING UNIV OF TECH
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