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A kind of solid oxide fuel cell two-phase composite cathode material and its preparation method

A solid oxide and fuel cell technology, which is applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of increasing the thermal expansion coefficient of the cathode, and achieve the effects of small thermal expansion, stable material structure, and simplified preparation process

Active Publication Date: 2020-05-26
QUJING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, doping has limited improvement on the intrinsic properties of the material, and compounding other cobalt-based perovskites introduces more cobalt elements, which increases the thermal expansion coefficient of the cathode.

Method used

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  • A kind of solid oxide fuel cell two-phase composite cathode material and its preparation method
  • A kind of solid oxide fuel cell two-phase composite cathode material and its preparation method
  • A kind of solid oxide fuel cell two-phase composite cathode material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0031] According to the single-phase cathode material Ca of solid oxide fuel cells 3 co 2 o 6 (which is x = 0) in the respective molar proportions of calcium and cobalt elements, weigh calcium nitrate and cobalt acetate to make a mixed solution; add ethylenediaminetetraacetic acid (EDTA) and citric acid as complexing agents to the calcium-cobalt mixed ion solution, Add the mass ratio of total metal ions: EDTA: citric acid = 1:1:1 (molar ratio), and keep stirring, and add concentrated ammonia water at the same time until EDTA is completely dissolved and the solution is clarified, and Adjust the pH value of the solution to 8-9 to obtain a brown-red solution; put the brown-red solution in an oven and bake it at a temperature of 100 ºC to evaporate most of the water to obtain a viscous gel. Bake at high temperature, thoroughly dry the moisture in the viscous gel to obtain dry gel; put the dry gel into a muffle furnace at 450 ºC to burn and decompose for 5 hours to obtain a bla...

Embodiment 2

[0034] According to the dual-phase composite cathode material of solid oxide fuel cell 0.75Ca 3 co 2 o 6 / 0.25Ce 1.8 SM 0.2 o 1.9 (which is x = 0.25) in the respective molar ratios of calcium cerium cobalt elements, weigh calcium nitrate, cerium nitrate, and cobalt acetate to make a mixed solution; 3 co 2 o 6 / 0.25Ce 1.8 SM 0.2 o 1.9 The molar ratio of samarium element in medium, weighed Sm 2 o 3 Put it into concentrated nitric acid solution to dissolve, and mix it with a solution containing calcium, cerium, and cobalt ions after the solution is clarified; add ethylenediaminetetraacetic acid (EDTA) and citric acid as complexing agents to the solution of calcium, cerium, cobalt, and samarium ions, and add mass ratio For the total metal ions: EDTA: citric acid = 1:1:1 (molar ratio), and keep stirring, while adding concentrated ammonia water until EDTA is completely dissolved and the solution is clarified, and the pH of the solution is adjusted When the value reache...

Embodiment 3

[0037] According to the dual-phase composite cathode material of solid oxide fuel cell 0.5Ca 3 co 2 o 6 / 0.5Ce 1.8 SM 0.2 o 1.9 (which is x = 0.5) in the respective molar proportions of calcium cerium cobalt elements, weigh calcium nitrate, cerium nitrate, and cobalt acetate to make a mixed solution; 3 co 2 o 6 / 0.5Ce 1.8 SM 0.2 o 1.9 The molar ratio of samarium element in medium, weighed Sm 2 o 3 Put it into concentrated nitric acid solution to dissolve, and mix it with a solution containing calcium, cerium, and cobalt ions after the solution is clarified; add ethylenediaminetetraacetic acid (EDTA) and citric acid as complexing agents to the solution of calcium, cerium, cobalt, and samarium ions, and add mass ratio For the total metal ions: EDTA: citric acid = 1:1:1 (molar ratio), and keep stirring, while adding concentrated ammonia water until EDTA is completely dissolved and the solution is clarified, and the pH of the solution is adjusted When the value reache...

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Abstract

The invention belongs to the technical field of a medium-temperature solid oxide fuel cell (SOFC) and particularly relates to a new double-phase negative electrode material of the SOFC and a preparation method of the double-phase negative electrode material. The double-phase proportion composition of the composite material is (1-x)Ca3Co2O6 / xCe1.8Sm0.2O1.9 (0< / =x< / =1), wherein Ca3Co2O6 is of a hexagonal structure, and the space group of the Ca3Co2O6 is R-3C; Ce1.8Sm0.2)1.9 is of a cubic structure, and the space group of the Ce1.8Sm0.2)1.9 is FM3-M. The double-phase composite negative electrodematerial is prepared by using a sol-gel method in a one-pot and synchronous manner. The preparation method includes: preparing a metal salt (nitrate or acetate) solution according to the stoichiometric ratio of the composite negative electrode material; adding ethylenediamine tetraacetic acid and citric acid which serve as complexing agents, and using ammonia water to regulate pH to be 8-9, wherein the ratio of total metal ions to the ethylenediamine tetraacetic acid to the citric acid is 1:1:1; subjecting the complexing solution to drying, calcining and annealing to obtain the target product.

Description

technical field [0001] The invention belongs to the technical field of medium temperature solid oxide fuel cell (SOFC), and specifically relates to a new SOFC dual-phase composite cathode material (1- x )Ca 3 co 2 o 6 / x Ce 1.8 SM 0.2 o 1.9 (0 ≤ x <1) and its preparation method. [0002] technical background [0003] Solid-oxide fuel cells (SOFC) is a power generation device that directly converts hydrocarbon fuels into electrical energy. It has the advantages of high efficiency, low pollution, and flexible fuel. The operating temperature of traditional SOFC is as high as about 1000 ºC, which puts high demands on electrode materials, battery components and auxiliary equipment, and the cost of battery construction, operation and maintenance is high. Reducing the operating temperature will help improve the matching between the various components of the battery and reduce operating costs. However, once the operating temperature is lowered, the ohmic resistance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M8/124
CPCY02E60/50
Inventor 李付绍夏书标闫宇星成飞翔
Owner QUJING NORMAL UNIV