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Stable solid oxide fuel cell cathode material realized by A-site regulation and preparation and application thereof

A fuel cell cathode, solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of decreased battery performance, increased battery area, slow kinetic process, etc., to achieve low activation energy, high power density, The effect of good stability

Pending Publication Date: 2022-07-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the decrease in temperature will also cause the kinetic process of the oxygen reduction reaction (Oxygen Reduction Reaction, ORR) related to the cathode to become significantly slower, resulting in a significant increase in the area specific resistance or interface resistance of the battery and a decrease in battery performance.

Method used

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  • Stable solid oxide fuel cell cathode material realized by A-site regulation and preparation and application thereof
  • Stable solid oxide fuel cell cathode material realized by A-site regulation and preparation and application thereof
  • Stable solid oxide fuel cell cathode material realized by A-site regulation and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a stable solid oxide fuel cell cathode material Ba realized by A-site regulation 0.8 Gd 0.8 Pr 0.4 Co 2 O 6-δ The preparation method specifically comprises the following steps:

[0038] 1) Take by weighing the barium nitrate of 4.182g, the gadolinium nitrate of 7.222g, the praseodymium nitrate of 3.480g, the cobalt nitrate of 11.641g, add deionized water to dissolve completely; Press metal ion (Ba, Gd, Pr and Co): Glycine: The molar ratio of citric acid monohydrate is 4:3:3. Weigh 4.504g of glycine and 12.608g of citric acid monohydrate as complexing agents, and add them to the above solution to obtain a mixed solution;

[0039] 2) The mixed solution is heated and stirred at a constant temperature of 120 ° C until the water evaporates to dryness to form a gel-like substance;

[0040] 3) heating the gelatinous substance in an oven at 300° C. to complete combustion, and keeping the temperature for 5 hours to obtain fluffy cathode material pre...

Embodiment 2

[0043] This embodiment provides a Ba 0.8 Gd 0.8 Pr 0.4 Co 2 O 6-δ A symmetrical battery is prepared for the battery cathode. The symmetrical battery adopts a "cathode|electrolyte|cathode" structure, which specifically includes the following steps:

[0044] 1) Weigh 1 g of the cathode powder obtained in Example 1, and weigh 0.76 g of terpineol and 0.04 g of ethyl cellulose according to the powder: terpineol: ethyl cellulose mass ratio of 100:76:4 Place in a mortar and grind to make cathode slurry;

[0045] 2) Evenly brush the cathode slurry on the dense LSGM (La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ ) on both sides of the electrolyte sheet, sintered at 1050 °C for 2 h in an air atmosphere to form a layered double perovskite Ba 0.8 Gd 0.8 Pr 0.4 Co 2 O 6-δ Porous electrode, the effective cathode area of ​​the battery is 0.47cm 2 , to obtain a symmetrical battery; it is used for the polarization impedance test of the cathode material in the temperature range of 600-800 °C...

Embodiment 3

[0047] This embodiment provides a Ba 0.8 Gd 0.8 Pr 0.4 Co 2 O 6-δ A single cell is prepared for the battery cathode. The single cell adopts the "Ni-GDC|LDC|LSGM|Cathode" structure, which specifically includes the following steps:

[0048] 1) Weigh 1 g of the cathode powder obtained in Example 1, and weigh 0.76 g of terpineol and 0.04 g of ethyl cellulose according to the powder: terpineol: ethyl cellulose mass ratio of 100:76:4 Place in a mortar and grind to make cathode slurry;

[0049] 2) The cathode slurry was evenly brushed on the surface of the LSGM electrolyte, and sintered at 1050 °C for 2 h in an air atmosphere to form a layered double perovskite Ba 0.8 Gd 0.8 Pr 0.4 Co 2 O 6-δ Porous electrode, the effective cathode area of ​​the battery is 0.2826cm 2 ; A transition layer LDC is prepared on the other side of the electrolyte, and an anode Ni-GDC is prepared on the other side of the transition layer; it is used for the output power test of the cathode material...

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Abstract

The invention belongs to the technical field of solid oxide fuel cells, and discloses a stable solid oxide fuel cell cathode material realized by A-site regulation and preparation and application thereof. The cathode material is characterized in that the composition general formula of the cathode material is AA 'B2O6-delta, the specific molecular formula of the cathode material is Ba < 1-x > Gd < 0.8 > Pr < 0.2 + x > Co2O6-delta, delta is larger than or equal to 0 and smaller than or equal to 1, and delta is the oxygen vacancy content; x satisfies 0 < = x < = 0.4. The invention also discloses a preparation method of the cathode material. The anionic material disclosed by the invention has relatively high electronic conductivity, relatively low polarization impedance, relatively low activation energy, relatively high power density and good stability. The cathode material is used for the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular relates to a stable solid oxide fuel cell cathode material realized by A-position regulation and its preparation and application. Background technique [0002] Solid oxide fuel cells (Solid Oxide Fuel Cells, SOFCs) is an energy storage and conversion device, which can directly convert chemical energy stored in fuels (mainly hydrogen and hydrocarbons) and oxidants into electrical energy. It is not limited by the Carnot cycle, and has the characteristics of high energy conversion efficiency, no pollutant emission, and environmental friendliness. The main structure of SOFCs includes dense electrolyte layer, porous cathode layer and anode layer. At present, perovskite-type materials are widely used as cathode materials for SOFCs due to their characteristics of both oxygen ion conduction and electron conduction. However, since SOFCs often need to operate under high t...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/9025H01M4/8825H01M4/88Y02E60/50
Inventor 陈宇朱峰
Owner SOUTH CHINA UNIV OF TECH
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