Solid oxide fuel cell and functional gradient composite cathode and preparation method thereof

A solid oxide, fuel cell technology, used in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve the problems of reducing battery performance, the initial performance of LNF cathode is not very good, etc., to increase ionic conductivity, improve oxygen Reduction reaction kinetic performance, excellent effect of anti-chromium poisoning performance

Active Publication Date: 2012-09-19
中氢新能源(江苏)有限公司
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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 LaNi at temperatures above 1000°C 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 , greatly reducing 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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preparation example Construction

[0045] The preparation method of the above-mentioned solid oxide fuel cell functionally graded composite cathode comprises the following steps:

[0046] a), LNF and doped CeO 2 The mixture (combining LNF and doped CeO 2 Just mix directly) and terpineol to form a slurry, and after the slurry is attached to the electrolyte layer and dried, the material is LNF-doped CeO 2 Anti-chromium poisoning layer; LNF and doped CeO 2 The mass ratio of LNF and doped CeO is preferably 7~8:3~2; 2 The mass ratio of the mixture and terpineol is preferably 1:0.7~1; the slurry is attached to the electrolyte layer, and the method used is a screen printing method; the drying temperature is preferably 100°C~120°C, and the drying The time is preferably 0.5 hours to 2 hours (drying time and temperature, those skilled in the art can adjust according to the actual situation, as long as the water is evaporated);

[0047] b), LSM and doped CeO 2 The mixture (combining LSM and doped CeO 2 Just mix dire...

Embodiment 1

[0081]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; mix 50gNiO and 50gYSZ Add the mixed powder to a mixed solvent of 48 grams of methyl ethyl ketone and 24 grams of ethanol, then add 3 grams of triethanolamine and mix for 2 hours, then add 10 grams of polyvinyl butyral, 13.5 grams of polyethylene glycol and continue ball milling A stable and uniform slurry was obtained in 2 hours, and the ball-milled slurry was kept for 10 minutes under the condition of a vacuum of 100 mbar to eliminate air bubbles in the slurry, which is slurry 2. Pour the uniform and stable slurry 1 into the...

Embodiment 2

[0084] Add 10 grams of ScSZ powder into a mixed solvent of 8 grams of methyl ethyl ketone 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; mix 50gNiO and 50gYSZ Add the mixed powder to a mixed solvent of 48 grams of methyl ethyl ketone and 24 grams of ethanol, then add 3 grams of triethanolamine and mix for 2 hours, then add 10 grams of polyvinyl butyral, 13.5 grams of polyethylene glycol and continue ball milling A stable and uniform slurry was obtained in 2 hours, and the ball-milled slurry was kept for 10 minutes under the condition of a vacuum of 100 mbar to eliminate air bubbles in the slurry, which is slurry 2. Pour the uniform and stable slurr...

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Abstract

The invention relates to a solid oxide fuel cell and a functional gradient composite cathode and a preparation method thereof. The functional gradient composite cathode for the solid oxide fuel cell comprises a chromium poisoning resistant layer, an activation layer and a current collection layer, wherein the chromium poisoning resistant layer is made of LNF (LaNi0.6Fe0.4O3) and doped CeO2, the activation layer is positioned above the chromium poisoning resistant layer and made of LSM (La0.8Sr0.2MnO3) and doped CeO2, and the current collection layer is positioned above the activation layer and made of LSM. The preparation method of the functional gradient composite cathode for the solid oxide fuel cell includes the steps: a, attaching paste of the chromium poisoning resistant layer onto an electrolyte layer and drying to obtain the chromium poisoning resistant layer; b, attaching paste of the activation layer onto the chromium poisoning resistant layer and drying to obtain the activation layer; c, attaching paste of the current collection layer to the activation layer and drying to obtain the current collection layer, so that a blank is obtained; and d, sintering the blank to obtain the functional gradient composite cathode. Chromium deposition of high-volatility CrO3 and CrO2 (OH)2 on cathode / electrolyte interfaces is reduced.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a functionally graded composite cathode of the solid oxide fuel cell; the invention also relates to a preparation method of the functionally graded 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. [0003] Among various metal alloys, Cr-containing metal alloys have become the most promising bipolar plate materials due to their advantages of low cost, easy processing, high el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/12H01M4/90H01M4/88H01M8/126
CPCY02E60/521Y02E60/525Y02E60/50
Inventor 黄波
Owner 中氢新能源(江苏)有限公司
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