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Solid oxide fuel cell

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, fuel cell components, battery electrodes, etc., can solve problems such as low sinterability and difficulty in controlling the amount of manganese

Inactive Publication Date: 2006-11-15
TOTO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxides containing yttrium oxide, zirconium oxide, and cerium oxide have low sinterability, and a sintering temperature of about 1500°C is required to form an electrolyte without gas permeability.
Therefore, it is considered difficult to control the amount of manganese that diffuses through the electrolyte to the fuel electrode

Method used

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Examples

Experimental program
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preparation example Construction

[0069] The preparation method of the raw material of the fuel electrode is not particularly limited as long as the fuel electrode materials such as NiO / SSZ and NiO / YSZ are uniformly mixed, but co-precipitation method, spray drying method and the like are listed.

[0070] In order to efficiently react oxygen ions and fuel gas, it is preferable to provide a fuel-side electrode reaction layer between the electrolyte and the fuel electrode. Details of the fuel-side electrode reaction layer will be described later.

[0071] Air side electrode reaction layer

[0072] According to a preferred solution of the present invention, at the interface of the air pole and the electrolyte, in order to promote

[0073] reaction, it is preferable to set an air-side electrode reaction layer between the air electrode and the electrolyte.

[0074] In the present invention, it is preferable that the oxygen ion conductivity of the air-side electrode reaction layer is high. In addition, by fur...

Embodiment

[0130] The present invention will be described in more detail by the following examples, but the present invention is not limited by these examples.

[0131] Test methods for various physical properties, performance, etc. in the examples are as follows.

[0132] Grain Size Measurement on Electrolyte Membrane Surface

[0133] Using S-4100 manufactured by Hitachi, Ltd., the membrane surface of the electrolyte was observed by SEM, and the fuel electrode side surface of the electrolyte was photographed at a magnification of 300 times. In addition, the particle size distribution of the particles is calculated by planimetric method in the photograph taken. In addition, the average grain size was also measured. That is, draw a known circle with area (A) on the photo, and the number n of particles in the circle c and the number n of particles falling on the circumference i And use the following formula to find the number of particles per unit area N G .

[0134] ...

Embodiment A1

[0157] Example A1: Fuel cell when the electrolyte is a layer containing SSZ

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Abstract

A solid oxide fuel cell is disclosed which is excellent in output performance and durability. The solid oxide fuel cell comprises at least an electrolyte, an air electrode and a fuel electrode, and the air electrode includes a perovskite oxide containing at least manganese. A layer which is in contact with the fuel electrode is formed to contain 0.3-4 weight% of manganese in the surface facing the fuel electrode. This invention has been made basing on the finding such that, in a solid oxide fuel cell having an air electrode composed of a perovskite oxide containing manganese, the manganese content in the fuel electrode side surface of a layer which is in contact with the fuel electrode greatly affects the performance of the fuel cell, and thus an excellent fuel cell can be obtained by controlling this manganese content.

Description

field of invention [0001] The present invention relates to a solid oxide fuel cell, and more specifically, to a solid oxide fuel cell excellent in output performance and durability. Background technique [0002] A solid oxide fuel cell is expected to be a fuel cell with a high operating temperature (900-1000° C.) and high efficiency. In order to realize a solid oxide fuel cell excellent in output performance and durability, various proposals have been made. [0003] For example, in JP-A-2003-22821 and JP-A-2003-22822, the following schemes are proposed: In a solid oxide fuel cell, in order to increase the oxygen ion concentration of an electrolyte containing zirconia in which scandium oxide is solid-dissolved, For conductivity stability and high temperature strength stability, at least one oxide selected from group 4A, group 5A, group 7A and group 4B is added. [0004] However, these publications do not disclose the combination with an air electrode containing manganese-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/12
CPCH01M4/8605H01M4/8657H01M4/9016H01M4/9033Y02E60/50
Inventor 樋渡研一村上弘展中村朋之盐野光伸
Owner TOTO LTD