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In-situ self-stabilized solid oxide fuel cell cathode, cell and preparation method thereof

A fuel cell cathode, solid oxide technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of LSCF modification difficult to promote the industrialization process, etc., and achieve long-term working stability, low phase formation temperature, ORR Highly active effect

Active Publication Date: 2020-08-25
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the modification of LSCF in the prior art is difficult to promote its industrialization process

Method used

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  • In-situ self-stabilized solid oxide fuel cell cathode, cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] LSCF powder preparation steps are as follows:

[0048] Dissolve the stoichiometric metal nitrate in deionized water, and prepare the precursor solution according to the molar ratio of metal ion: EDTA: citric acid of 1:1:1.5. After the precursor solution is dissolved and clarified, add ammonia water to adjust the pH value to 8 , stirred in an oil bath at 70°C until a viscous gel was formed, and then placed in an oven at 200°C for 14 hours to form a porous precursor. Grind the precursor evenly and calcined at 750°C for 5 hours to obtain LSCF powder. The powder after the phase is subjected to ball milling and flotation treatment to obtain nano-scale LSCF cathode powder, and the above-mentioned LSCF powder and carbon powder are added to a binder according to a certain solid content ratio to grind into a cathode slurry, and screened Printed onto the surface of the dense GDC electrolyte and sintered at 1100°C to form a porous LSCF framework.

[0049] The steps of coating the...

Embodiment 2

[0055] LSCF powder preparation steps are as follows:

[0056] Dissolve the stoichiometric metal nitrate in deionized water, and prepare the precursor solution according to the molar ratio of metal ion: EDTA: citric acid of 1:1:1.5. After the precursor solution is dissolved and clarified, add ammonia water to adjust the pH value to 9 , stirred in an oil bath at 90°C until a viscous gel was formed, and then placed in an oven at 160°C for 10 hours to form a porous precursor. Grind the precursor evenly and calcined at 850°C for 3 hours to obtain LSCF powder. The powder after the phase is subjected to ball milling and flotation treatment to obtain nano-scale LSCF cathode powder, and the above-mentioned LSCF powder and carbon powder are added to a binder according to a certain solid content ratio to grind into a cathode slurry, and screened Printed onto the surface of the dense GDC electrolyte and sintered at 900°C to form a porous LSCF framework.

[0057] The steps of coating the ...

Embodiment 3

[0063] LSCF powder preparation steps are as follows:

[0064] Dissolve the stoichiometric metal nitrate in deionized water, and prepare the precursor solution according to the molar ratio of metal ion: EDTA: citric acid of 1:1:1.5. After the precursor solution is dissolved and clarified, add ammonia water to adjust the pH value to 8.5 , stir in an oil bath at 80°C until a viscous gel is formed, then place it in an oven at 180°C for 12 hours to form a porous precursor, grind the precursor evenly, and calcinate at 800°C for 4 hours to obtain LSCF powder. The powder after the phase is subjected to ball milling and flotation treatment to obtain nano-scale LSCF cathode powder, and the above-mentioned LSCF powder and carbon powder are added to a binder according to a certain solid content ratio to grind into a cathode slurry, and screened Printed onto the surface of the dense GDC electrolyte and sintered at 1000°C to form a porous LSCF framework.

[0065] The steps of coating the L...

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Abstract

The invention discloses an in-situ self-stabilized solid oxide fuel cell cathode, a cell and a preparation method thereof, and belongs to the field of a fuel cell. The in-situ self-stabilized solid oxide fuel cell cathode comprises an active material with a core-shell structure, wherein the core body is La0.6Sr0.4Co0.2Fe0.8O3-delta; the shell layer is a perovskite material La1-xCoO3-delta with A-site vacancy, wherein the perovskite material La1-xCoO3-delta with A-site vacancy is compactly coated on the surface of La0.6Sr0.4Co0.2Fe0.8O3-delta, x being more than 0 and less than or equal to 0.1,and delta being a value for keeping the compound electrically neutral. A La1-xSryCoO3-delta interface transition layer is formed in situ between the core body and the shell layer of the active material, wherein x is more than 0 and less than or equal to 0.1, y is more than 0 and less than or equal to x, and delta is a value for keeping the compound electrically neutral. The invention further provides a preparation method of the in-situ self-stabilized solid oxide fuel cell cathode. Compared with a traditional process, the method omits the step of calcining in advance.

Description

technical field [0001] The invention belongs to the field of fuel cells, and more specifically relates to an in-situ self-stabilizing solid oxide fuel cell cathode, a cell and a preparation method thereof. Background technique [0002] The energy shortage and environmental pollution brought about by the rapid operation of the world economy and the surge in population are common challenges faced by the international community today. Promoting the large-scale application of new energy economically and rationally is an important way to achieve sustainable social development. Among many new energy systems, solid oxide fuel cell (SOFC) has attracted widespread attention due to its high efficiency, cleanliness, and quietness. Compared with traditional coal-fired thermal power generation, SOFC can directly convert chemical energy into electrical energy, avoiding the Carnot cycle and reducing fuel energy loss. The industrialization of SOFC technology is expected to alleviate the p...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/86H01M4/88H01M8/1246B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8657H01M4/8835H01M4/8885H01M4/905H01M4/9075H01M8/1246Y02E60/50
Inventor 李矜赵丽吴聪聪董兵海王世敏
Owner HUBEI UNIV
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