JPH07109767B2 - Air electrode structure of solid electrolyte fuel cell - Google Patents
Air electrode structure of solid electrolyte fuel cellInfo
- Publication number
- JPH07109767B2 JPH07109767B2 JP2254715A JP25471590A JPH07109767B2 JP H07109767 B2 JPH07109767 B2 JP H07109767B2 JP 2254715 A JP2254715 A JP 2254715A JP 25471590 A JP25471590 A JP 25471590A JP H07109767 B2 JPH07109767 B2 JP H07109767B2
- Authority
- JP
- Japan
- Prior art keywords
- solid electrolyte
- electrode
- fuel cell
- air electrode
- electrolyte fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
- H01M4/9025—Oxides specially used in fuel cell operating at high temperature, e.g. SOFC
- H01M4/9033—Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inert Electrodes (AREA)
- Fuel Cell (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、固体電解質燃料電池の空気極構造体に関す
る。更に詳しくは、従来の多孔質電極で見られるよう
な、電極材の電気伝導率の低下乃至濃度分極を最小限に
抑えるようにした固体電解質燃料電池の空気極構造体に
関する。TECHNICAL FIELD The present invention relates to an air electrode structure for a solid oxide fuel cell. More specifically, the present invention relates to an air electrode structure of a solid electrolyte fuel cell in which a decrease in electric conductivity of an electrode material or a concentration polarization as seen in a conventional porous electrode is suppressed to a minimum.
（従来の技術） 従来、Y2O3で安定化したZrO2を固体電解質として使用し
たH2−O2、CO−O2などの固体電解質燃料電池の空気極と
しては、できるだけ多くの三相帯を供給するために、多
孔質な構造のものが主に開発研究されてきた。(Prior Art) Conventionally, as an air electrode of a solid electrolyte fuel cell of the ZrO 2 stabilized with Y 2 O 3 such as H 2 -O 2, CO-O 2 was used as a solid electrolyte, as many of the three-phase Porous structures have been mainly developed and studied for supplying the ribbon.
また、従来の多孔質電極では、電池の内部抵抗を小さく
するために、電極の厚みをかなり厚くする必要があっ
た。Further, in the conventional porous electrode, the thickness of the electrode needs to be considerably increased in order to reduce the internal resistance of the battery.
（発明が解決しようとする問題点） ところで、現在開発されている固体電解質燃料電池は構
造上、幾つかの種類に分類されるが、そのうち、最も開
発の進んでいる円筒型のものにおいては、電子が電極膜
中を膜に沿って流れるので、電極材料には非常に電気導
伝度の良いものが望まれる。(Problems to be Solved by the Invention) The solid electrolyte fuel cells currently being developed are structurally classified into several types. Among them, the cylindrical type which has been most developed is Electrons flow in the electrode film along the film, so that an electrode material having a very good electric conductivity is desired.
しかし、この電気導伝率はそれ自身の気孔率に非常に大
きく依存し、気孔率が大きくなると電気導伝率は激減す
るので、従来の多孔質電極は電気導伝性において望まし
いものではない。However, this electric conductivity depends very much on its own porosity, and when the porosity increases, the electric conductivity decreases sharply, so that the conventional porous electrode is not desirable in terms of electric conductivity.
また上述のような多孔質電極の厚みを厚くすると反応気
体が拡散によって単位時間に反応箇所に到達できる量が
少なくなるので反応種による濃度分極の影響が大きくな
るという問題点があった。Further, if the thickness of the porous electrode is increased, the amount of the reaction gas that can reach the reaction site per unit time due to diffusion is reduced, so that there is a problem that the influence of the concentration polarization by the reaction species is increased.
そこで、本願発明者は従来の多孔質電極で見られるよう
な濃度分極を最小限に抑えることを目的とするものであ
る。Therefore, the present inventor aims to minimize the concentration polarization as seen in the conventional porous electrode.
（問題点を解決するための手段） この発明では、以上の問題点を解決するために、固体電
解質燃料電池において固体電解質と接する部分の空気極
をペロブスカイト構造を持った物質の緻密膜で構成した
固体電解質燃料電池の空気極構造体を提案するものであ
る。(Means for Solving Problems) In the present invention, in order to solve the above problems, in the solid electrolyte fuel cell, the air electrode in contact with the solid electrolyte is formed of a dense film of a substance having a perovskite structure. An air electrode structure for a solid oxide fuel cell is proposed.
この発明で使用するペロブスカイト構造を持った物質と
しては、例えばLa0.7Sr0.3CoO3、La0.7Sr0.3MnO3等を挙
げることができる。Examples of the substance having a perovskite structure used in the present invention include La 0.7 Sr 0.3 CoO 3 and La 0.7 Sr 0.3 MnO 3 .
また、固体電解質としてはY2O3で安定化したZrO2等を挙
げることができる。Examples of the solid electrolyte include ZrO 2 stabilized with Y 2 O 3 .
更に、固体電解質と接する部分にペロブスカイト構造を
持った物質の緻密膜を形成するには溶射法よって行なう
ことができる。Further, in order to form a dense film of a substance having a perovskite structure in a portion in contact with the solid electrolyte, a thermal spraying method can be used.
（作用） この発明によれば、混合導伝性を有するペロブスカイト
構造を持った物質の緻密膜で空気極の大半を形成するた
め、従来の電極構造に見られるような気孔率の増大によ
る電極材の電気伝導率の低下は殆どなく、また多孔質膜
部分の厚みを薄くすることができるため、反応種の拡散
速度低下による濃度分極も最小限に抑えることができ
る。(Operation) According to the present invention, since most of the air electrode is formed by a dense film of a substance having a perovskite structure having mixed conductivity, the electrode material due to the increase in porosity as seen in the conventional electrode structure is formed. There is almost no decrease in the electric conductivity and the thickness of the porous film portion can be reduced, so that the concentration polarization due to the decrease in the diffusion speed of the reactive species can be suppressed to the minimum.
更に、上記緻密膜の空気極上に同一の材質で多孔質構造
の薄い層を載せることにより、電極反応の起こる電極表
面の反応性を大きくすることができる。この場合、表面
の多孔質構造の層は極めて薄いため、反応種の拡散速度
の低下による濃度分極の影響も非常に少ない。Furthermore, by placing a thin layer of the same material having a porous structure on the air electrode of the dense film, the reactivity of the electrode surface where the electrode reaction occurs can be increased. In this case, since the layer having the porous structure on the surface is extremely thin, the influence of concentration polarization due to the decrease in the diffusion rate of the reactive species is very small.
（実施例） 以下、この発明を図示の実施例に基づいて詳細に説明す
る。(Example) Hereinafter, the present invention will be described in detail based on an illustrated example.
第１図は、この発明による電極構造の断面である。１は
Y2O3で安定化したZrO2で構成される固体電解質層、固体
電解質層１の表面には溶射法により形成したLa0.7Sr0.3
MnO3からなる緻密膜電極層２を形成し、更に緻密膜電極
層２上には緻密膜電極層２と同一の材料で多孔質電極層
３を薄く形成する。FIG. 1 is a cross section of an electrode structure according to the present invention. 1 is
A solid electrolyte layer composed of ZrO 2 stabilized with Y 2 O 3 and La 0.7 Sr 0.3 formed on the surface of the solid electrolyte layer 1 by a thermal spraying method.
A dense film electrode layer 2 made of MnO 3 is formed, and a porous electrode layer 3 made of the same material as the dense film electrode layer 2 is thinly formed on the dense film electrode layer 2.
以上の構造の緻密膜電極層２、多孔質電極層３を空気極
とし、一方の多孔質電極（図示せず）を負極とし、負極
には水素ガスを導入して空気極の酸素との間に酸化還元
の電極反応を行なわせた。The dense membrane electrode layer 2 and the porous electrode layer 3 having the above structures are used as an air electrode, one porous electrode (not shown) is used as a negative electrode, and hydrogen gas is introduced into the negative electrode so as to be connected to oxygen in the air electrode. Was subjected to an electrode reaction of redox.
この結果、緻密膜電極２単層からなる電極特性よりもは
るかに良い特性が得られ、また濃度分極の影響は殆どな
かった。As a result, much better characteristics were obtained than the electrode characteristics composed of the single layer of the dense film electrode 2, and there was almost no effect of concentration polarization.
（発明の効果） 以上要するに、この発明によれば従来の多孔質電極を使
用した固体電解質燃料電池で見られるような、電極材の
電気伝導率の低下或は濃度分極というような問題点を一
挙に解決することができる。(Effects of the Invention) In summary, according to the present invention, the problems such as the decrease in the electric conductivity of the electrode material or the concentration polarization, which are observed in the conventional solid electrolyte fuel cell using the porous electrode, are all solved. Can be solved.
第１図は、この発明の一実施例を示す空気極構造の断面
図である。 図中、１は固体電解質層、２は緻密膜電極層、３は多孔
質電極層。FIG. 1 is a sectional view of an air electrode structure showing an embodiment of the present invention. In the figure, 1 is a solid electrolyte layer, 2 is a dense membrane electrode layer, and 3 is a porous electrode layer.
Claims (2)
接する部分の空気極を、ペロプスカイト構造を持った物
質の緻密膜で構成し、更に上記緻密膜上にこれと同一物
質で形成された多孔質膜を設けたことを特徴とする固体
電解質燃料電池の空気極構造体。1. A solid electrolyte fuel cell, wherein an air electrode in contact with a solid electrolyte is composed of a dense film of a substance having a perovskite structure, and a porous material formed of the same substance on the dense film. An air electrode structure for a solid oxide fuel cell, comprising a membrane.
接する部分に溶射法でペロプスカイト構造を持った物質
の緻密膜を形成し、更に上記緻密膜上にこれと同一物質
で形成された多孔質膜を設けたことを特徴とする固体電
解質燃料電池の空気極構造体の製造方法。2. A dense film of a substance having a perovskite structure is formed by a thermal spraying method at a portion in contact with a solid electrolyte in a solid electrolyte fuel cell, and a porous film made of the same substance as the dense film is further formed on the dense film. A method for manufacturing an air electrode structure for a solid oxide fuel cell, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2254715A JPH07109767B2 (en) | 1990-09-25 | 1990-09-25 | Air electrode structure of solid electrolyte fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2254715A JPH07109767B2 (en) | 1990-09-25 | 1990-09-25 | Air electrode structure of solid electrolyte fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04133265A JPH04133265A (en) | 1992-05-07 |
| JPH07109767B2 true JPH07109767B2 (en) | 1995-11-22 |
Family
ID=17268843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2254715A Expired - Lifetime JPH07109767B2 (en) | 1990-09-25 | 1990-09-25 | Air electrode structure of solid electrolyte fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07109767B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07109768B2 (en) * | 1990-09-25 | 1995-11-22 | 工業技術院長 | Air electrode structure of solid electrolyte fuel cell |
| JP4715135B2 (en) * | 2004-09-08 | 2011-07-06 | トヨタ自動車株式会社 | Fuel cell manufacturing method and fuel cell |
| JP4748964B2 (en) * | 2004-09-28 | 2011-08-17 | 京セラ株式会社 | Fuel cell, fuel cell stack, fuel cell |
| JP2007149439A (en) * | 2005-11-25 | 2007-06-14 | Shinko Electric Ind Co Ltd | Solid electrolyte fuel cell |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6337569A (en) * | 1986-08-01 | 1988-02-18 | Toa Nenryo Kogyo Kk | Oxygen electrode structure for high-temperature solid electrolyte fuel cell |
| JPS6358766A (en) * | 1986-08-29 | 1988-03-14 | Toa Nenryo Kogyo Kk | Oxygen electrode structure for high temperature solid electrolyte fuel cell |
| JP2818948B2 (en) * | 1989-04-28 | 1998-10-30 | 株式会社フジクラ | Method for manufacturing solid electrolyte fuel cell |
| JPH07109768B2 (en) * | 1990-09-25 | 1995-11-22 | 工業技術院長 | Air electrode structure of solid electrolyte fuel cell |
-
1990
- 1990-09-25 JP JP2254715A patent/JPH07109767B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04133265A (en) | 1992-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |