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Cathode material of solid oxide fuel cell and preparation method of cathode material

A solid oxide, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of easy detachment of cathodes, high prices, mismatched thermal expansion coefficients, etc., to achieve cost reduction, high catalytic activity, and reduced cathode attenuation. Effect

Pending Publication Date: 2021-09-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the perovskite cathode materials have the following problems: (1) generally contain Sr and Co elements; the existing high catalytic activity materials contain Sr and Co elements, and the Sr element of the cathode material diffuses into the electrolyte at high temperature to form SrZrO 3 Miscellaneous phase; the Co element in the cathode material is likely to cause the thermal expansion coefficient of the material to be too large, which does not match the thermal expansion coefficient of the electrolyte material. The cathode is easy to fall off under long-term operating conditions, which increases the battery decay rate. In addition, Co is expensive in actual use and cannot be used. Facilitate commercial scale production
(2) In order to improve the high-temperature catalytic activity of cathode materials, noble metals such as Pt and Ag are doped with perovskite materials, although it is beneficial to improve the material performance, but it increases the commercialization cost
(3) Rare earth raw materials Co, Pr, Nb, and Ta used in the cathode are relatively expensive, which is not conducive to commercial mass production
(4) The currently reported perovskite cathode materials are all double-element doped at the A-site or double-element doped or triple-element doped at the B-site, but there are few reports of three-element doping at the A-site
Dong et al. published a Ba 0.95 La 0.05 FeO 3-d Cathode material whose polarization surface resistance (ASR) reaches 0.037Ωcm at 700°C 2 , but its coefficient of thermal expansion is 24.5×10 -6 K -1 , and the coefficient of thermal expansion of the electrolyte (10.5×10 - 6 K -1 ) has a large gap and does not match

Method used

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  • Cathode material of solid oxide fuel cell and preparation method of cathode material
  • Cathode material of solid oxide fuel cell and preparation method of cathode material
  • Cathode material of solid oxide fuel cell and preparation method of cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Ba by solid-liquid composite method 0.5 La 0.125 Zn 0.375 NiO 3 ,Proceed as follows:

[0034] (1) According to Ba 0.5 La 0.125 Zn 0.375 NiO 3 The stoichiometric ratio of the corresponding barium acetate, lanthanum nitrate, zinc acetate and nickel nitrate is taken as raw materials; the raw materials are put into the grinding tank, and deionized water and citric acid complexing agent are added, wherein the raw materials, deionized water, citric acid The mass ratio of zirconium balls is 1:0.5:0.8. After adding zirconium balls, put them into a ball mill to grind for 10 h at a speed of 300 r / min to obtain a gel-like precursor.

[0035] (2) Put the gel-like precursor in an oven, dry it at 120°C for 3 hours, then raise the temperature to 250°C and dry it for 3 hours; calcinate the dried precursor in a high-temperature furnace at a temperature of 800°C. The time is 2 hours; the calcined product is crushed by a high-speed sand mill and dried to obtain a po...

Embodiment 2

[0044] Preparation of BaLa by sol-gel method 0.25 Zn 0.75 FeO 4 ,Proceed as follows:

[0045] (1) According to BaLa 0.25 Zn 0.75 FeO 4 The stoichiometric ratio of the corresponding barium acetate, lanthanum nitrate, zinc acetate and ferric nitrate is weighed as raw materials; the raw materials are put into the grinding tank, and deionized water and citric acid complexing agent are added to form a mixed solution, wherein the raw materials, deionized water , The mass ratio of citric acid is 1:0.5:0.8.

[0046] (2) Put the mixed solution into a water-bath evaporator, stir while heating, set the temperature of the water-bath evaporator to 80°C until the water evaporates; put the evaporated precursor into an oven, and dry at 120°C for 3 hours The temperature was raised to 250°C and dried for 3 hours; the dried precursor was calcined in a high-temperature furnace at a temperature of 800°C for 2 hours; the calcined product was crushed by a high-speed ball mill and dried to obta...

Embodiment 3

[0052] Preparation of Ca by solid state reaction method 1.12 La 0.28 Zn 0.6 Ni 2 o 5 ,Proceed as follows:

[0053] (1) According to Ca 1.12 La 0.28 Zn 0.6 Ni 2 o 5 Weigh the corresponding calcium acetate, lanthanum nitrate, zinc acetate and nickel nitrate as raw materials; put the raw materials into a grinding tank, add zirconium balls and put them into a ball mill for grinding for 10 hours at a speed of 300r / min to obtain a mixed powder.

[0054](2) Calcining the mixed powder in a high-temperature furnace, the calcination temperature is 800° C., and the calcination time is 2 hours; the calcined product is crushed by a high-speed sand mill and dried to obtain a powder product.

[0055] Put the powder product sample prepared above into an X-ray diffractometer, and test the XRD spectrum of the powder, the results are as follows: figure 1 As shown, the refined test results show that its crystal structure is a rhombohedral perovskite structure, and the average crystal pa...

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Abstract

The invention provides a cathode material of a solid oxide fuel cell, wherein the chemical molecular formula of the cathode material is A'[1-x-y]A''[y]Zn[x]BO[3], A'[2-x-y]A''[y]Zn[x]B[2]O[5] and A'[2-x-y]A''[y]Zn[x]BO[4], wherein A' and A'' are two different elements, A' is a non-Sr alkali metal, and A'' is a non-Sr alkali metal; B is one of Fe, Ni and Mn; and x is more than 0.2 and less than 0.8, and Y is more than 0.1 and less than 0.5. The cathode material does not contain common Sr and Co elements, the A site is a three-doped element comprising a cheap alkali metal Zn, the cost is low, and commercial mass production is realized while the cathode material has high catalytic activity. The thermal expansion coefficient of the material at high temperature is close to that of an electrolyte, so that cathode attenuation caused by mismatching of the thermal expansion coefficients can be remarkably reduced, and the durability of the solid oxide fuel cell is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a cathode material of a solid oxide fuel cell and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an all-solid-state chemical power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy efficiently and environmentally friendly at medium and high temperatures. It has high efficiency, no pollution, and all-solid-state The advantage of the structure is that it can adapt to a variety of fuel gases and does not require an additional reforming device. [0003] The solid oxide fuel cell structure mainly includes cathode, anode, electrolyte, support and so on. Among them, the cathode is an electrode where the cathode material catalyzes oxygen to form oxygen ions at high temperature. With the progress of research, cathode materials have developed a variety of materials, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M4/86
CPCH01M4/9033H01M4/8825H01M4/8842H01M2004/8684Y02E60/50
Inventor 曹宝华王建新官万兵杨钧
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI