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Gradient composite cathode for solid oxide fuel cell and preparation method thereof

A solid oxide and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced battery performance and poor initial performance of LNF cathodes

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, La(Ni,Fe)O 3 At the same sintering temperature, compared with the classical (La,Sr)MnO 3 Easier with ZrO 2 base electrolyte reaction, such as when the temperature is higher than 1000 ℃, LaNi 0.6 Fe 0.4 o 3 i.e. with ZrO 2 The base electrolyte reacts to form insulating La 2 Zr 2 o 7 , significantly degrading its battery performance
On the other hand, due to the characteristics of the LNF material itself, such as the reoxidation of the LNF cathode material at the operating temperature and the subsequent decrease in the concentration of oxygen vacancies, the initial performance of the LNF cathode is not very good (see S.I.Hashimoto, K.Kammer, P.H. Larsen, F.W. Poulsen, M. Mogensen, Solid State Ionics 176 (2005) 1013)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 10 grams of ScSZ powder into a mixed solvent of 8 grams of butanone and 4 grams of ethanol, then add 0.5 grams of triethanolamine and mix for 2 hours, then add 0.4 grams of polyvinyl butyral, 1.5 grams of polyvinyl butyral Ethylene glycol and continue ball milling for 2 hours to obtain a stable and uniform slurry. Keep the ball-milled slurry for 10 minutes under a vacuum of 100 mbar to eliminate the air bubbles in the slurry. This is slurry one;

[0050] Add 50g of NiO and 50g of YSZ mixed powder into a mixed solvent of 48 grams of methyl ethyl ketone and 24 grams of ethanol, then add 3 grams of triethanolamine and ball mill and mix for 2 hours, then add 10 grams of polyvinyl butyral, 13.5 grams of polyvinyl butyral Ethylene glycol and continue ball milling for 2 hours to obtain a stable and uniform slurry. Keep the ball-milled slurry for 10 minutes under a vacuum of 100 mbar to eliminate the air bubbles in the slurry. This is slurry 2;

[0051] Pour the uniform and...

Embodiment 2

[0057] The preparation method of the NiO-YSZ / ScSZ anode composite film is the same as that in Example 1.

[0058] Doped CeO with 0.6g LNF powder and 0.4g Sm 2 (Sm 0.2 Ce 0.8 o 2 , SDC) powder mixture mixed with 1g terpineol into a slurry, deposited on the ScSZ electrolyte layer by screen printing and dried at 110°C for 0.5 hours, the LNF-SDC barrier layer was made, the thickness of the barrier layer 8~10 microns;

[0059] Then, a mixture of 0.7g of LNF powder and 0.3g of SDC powder and 1g of terpineol was mixed to form a slurry, which was deposited on the LNF-SDC barrier layer by screen printing and dried at 110°C for 0.5 hours. Form an activation layer LNF-SDC, the thickness of the activation layer is 8-10 microns;

[0060] Finally, 1g of LNF powder and 1g of terpineol were mixed to form a slurry, which was deposited on the LNF-SDC activation layer by screen printing and dried at 110°C for 0.5 hours to form the LNF collector layer. The thickness of the solid oxide fuel ...

Embodiment 3

[0063] The preparation method of the NiO-YSZ / ScSZ anode composite film is the same as that in Example 1.

[0064] A mixture of 0.6g LNF powder, 0.2g GDC powder and 0.2g SDC powder was mixed with 1g terpineol to form a slurry, which was deposited on the ScSZ electrolyte layer by screen printing and dried at 110°C for 0.5 hours. That is to make the LNF-GDC-SDC barrier layer, the thickness of the barrier layer is 8-10 microns;

[0065] Then, a mixture of 0.7 g of LNF powder, 0.15 g of GDC powder and 0.15 g of SDC powder was mixed with 1 g of terpineol to form a slurry, which was deposited on the LNF-GDC-SDC barrier layer by screen printing and processed at 110 After drying at ℃ for 0.5 hours, the LNF-GDC-SDC activation layer is formed, and the thickness of the activation layer is 8-10 microns;

[0066] Finally, 1 g of LNF powder and 1 g of terpineol were mixed to form a slurry, which was deposited on the LNF-GDC-SDC activation layer by screen printing and dried at 110 °C for 0.5...

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Abstract

The invention relates to a cathode for a solid oxide fuel cell and a preparation method thereof. A gradient composite cathode for the solid oxide fuel cell comprises a barrier layer, an activating layer and a current collection layer, wherein the barrier layer is made of an LNF-doped CeO2 material; the activating layer is located on the barrier layer and is made of the LNF-doped CeO2 material; and the current collection layer is located on the activating layer and is made of an LNF material. The preparation method for the gradient composite cathode comprises the following steps of: 1) attaching slurry of the barrier layer to an electrolyte and drying, thereby obtaining the barrier layer; 2) attaching the slurry of the activating layer to the barrier layer and drying, thereby obtaining the activating layer; 3) attaching the slurry of the current collection layer to the activating layer and drying, thereby preparing into the current collection layer and obtaining a blank; and 4) sintering the blank. The gradient composite cathode for the solid oxide fuel cell prepared according to the preparation method provided by the invention is excellent in electrochemical catalysis property. The preparation method for the gradient composite cathode is simple; the preparation period is short; and the gradient composite cathode is low in cost and is suitable for industrial application.

Description

technical field [0001] The invention relates to a cathode of a solid oxide fuel cell, in particular to an LNF gradient composite cathode of the solid oxide fuel cell, and also relates to a preparation method of the LNF gradient composite cathode of the solid oxide fuel cell. Background technique [0002] At present, during the development of solid oxide fuel cells (Solid Oxide Fuel Cell, SOFC), people are more and more aware of the importance of reducing the operating temperature of the battery. If the working temperature of the battery can be lowered to a medium temperature (700-800°C), the stability of the electrode can be improved, the thermal stress can be reduced, the battery life can be prolonged, and cheap metal alloys can also be used as the bipolar plate material of the battery. However, as the operating temperature of the battery decreases, the ionic conductivity of the traditional electrolyte yttria stabilized zirconia (YSZ) and the catalytic activity of the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88
CPCY02E60/50
Inventor 黄波朱新坚任睿轩胡一星刘烨彬丁小益刘宗尧吕尧
Owner SHANGHAI JIAO TONG UNIV
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