JP3342707B2 - Gas diffusion electrode - Google Patents
Gas diffusion electrodeInfo
- Publication number
- JP3342707B2 JP3342707B2 JP32655291A JP32655291A JP3342707B2 JP 3342707 B2 JP3342707 B2 JP 3342707B2 JP 32655291 A JP32655291 A JP 32655291A JP 32655291 A JP32655291 A JP 32655291A JP 3342707 B2 JP3342707 B2 JP 3342707B2
- Authority
- JP
- Japan
- Prior art keywords
- ridge
- gas diffusion
- diffusion electrode
- carbon fiber
- paper
- 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 - Fee Related
Links
Classifications
-
- 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
- Inert Electrodes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、特に燃料電池用に好適
なガス拡散電極及びその製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas diffusion electrode particularly suitable for a fuel cell and a method for producing the same.
【０００２】[0002]
【従来の技術】ガス拡散電極の代表的構造を図５に示
す。ガス拡散電極はその一面に複数の突条部（２）とセ
パレータ（３）と呼ばれる気体不透過性の黒鉛板で形成
されるガス流路（１−２）を設け平板部（１）の反対面
に触媒層（１−３）を設けた炭素多孔質体である。2. Description of the Related Art A typical structure of a gas diffusion electrode is shown in FIG. The gas diffusion electrode is provided with a plurality of ridges (2) and a gas flow path (1-2) formed of a gas-impermeable graphite plate called a separator (3) on one surface, and is provided opposite to the flat plate (1). It is a carbon porous body having a surface provided with a catalyst layer (1-3).
【０００３】このガス拡散電極は、多孔質体でありなが
ら、電気伝導性、ガス流路（１−２）形成のための機械
加工、電池構成に当って電極の積層圧力に耐える十分な
機械的強度等が要求される。Although this gas diffusion electrode is a porous material, it has sufficient mechanical properties to withstand electrical conductivity, machining for forming a gas flow path (1-2), and stacking pressure of the electrode in battery construction. Strength is required.
【０００４】従来、電極用多孔質体を製造するための技
術としては、数ミリメートルの炭素繊維を出来るだけ方
向性（平面方向及び厚さ方向）のない様に抄紙した薄板
に樹脂含浸を行った後、この樹脂を炭化して繊維の結合
材とした多孔質体を機械加工によりガス流路を形成した
ものであるが多孔質性と前記要求性能の向上は相反する
ものでありこの両者を満足せしめることは困難であっ
た。Heretofore, as a technique for producing a porous body for an electrode, a resin sheet has been impregnated into a thin sheet made of carbon fibers of several millimeters so as to have as little directionality (plane direction and thickness direction) as possible. After that, a gas flow path was formed by machining a porous body obtained by carbonizing this resin to form a fiber binding material. However, the improvement of the required performance and the porosity are contradictory, and both are satisfied. It was difficult to make it go.
【０００５】この様な問題に対し特公平１−２９３０９
号公報、特開昭６３−９６８号公報等には補強成分を付
加することによって解決する方法が提案されている。し
かし従来提案された方法では、多孔性を犠牲にしたり経
済的或は具体性に欠ける等の問題を含んでいた。[0005] To deal with such a problem, Japanese Patent Publication No.
And JP-A-63-968 propose a method for solving the problem by adding a reinforcing component. However, the methods proposed heretofore include problems such as sacrificing porosity and lacking in economy or specificity.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、ガス
拡散電極を突条部と平面部に分離することによって電極
の各部位に最も好ましい構造を実現するための新規なガ
ス拡散電極を具体化することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a novel gas diffusion electrode for realizing the most preferable structure in each part of the electrode by separating the gas diffusion electrode into a ridge and a flat portion. It is to become.
【０００７】[0007]
【課題を解決するための手段】本発明は、ガス拡散電極
用多孔質体の構造、特に燃料電池のガス拡散電極として
炭素繊維により構成された多孔質電極でガス流路を形成
する所定間隔毎の突条部を有する電極板の構造に係るも
ので、その要旨とするところは、平板部上に突条部と該
突条部間に形成されるガス流路とを有するガス拡散電極
に於て、突条部と平板部が構造的に分離されており、且
つ、突条部の中央部の密度が側部よりも低いことを特徴
とするガス拡散電極にある。SUMMARY OF THE INVENTION The present invention relates to a structure of a porous body for a gas diffusion electrode, and more particularly, to a method for forming a gas flow path with a porous electrode made of carbon fiber as a gas diffusion electrode of a fuel cell. The gist of the invention relates to a gas diffusion electrode having a ridge on a flat plate portion and a gas flow path formed between the ridges. The gas diffusion electrode is characterized in that the ridge portion and the flat plate portion are structurally separated, and the density of the central portion of the ridge portion is lower than that of the side portion.
【０００８】本発明の電極構造は、図１に模式的に示さ
れる如く平板部（１）と突条部（２）が分離された構造
を基本とする。この様な構造は従来技術により得た多孔
質体では機械的強度が低いため実現することが不可能で
あったが、本発明の構成に於ては可能となりこの様な分
離された構造をとることによって電極各部位に最も好ま
しい多孔質構造を実現することが可能となる。The electrode structure of the present invention is based on a structure in which a flat plate (1) and a ridge (2) are separated as schematically shown in FIG. Such a structure could not be realized with the porous body obtained by the prior art because of its low mechanical strength. However, the structure according to the present invention becomes possible and takes such a separated structure. This makes it possible to realize the most preferable porous structure at each part of the electrode.
【０００９】なお、この平板部（１）と突条部（２）の
分離した構造は、それぞれを製作した後接着或は機械的
接合を行った電極、さらには、構造の異なる突条部と平
板部を炭化前に接合した後炭化処理を行って得た電極も
含まれるものであり、本発明に於ける分離した構造とは
多孔質の構造が分離しているか否かであり、外見状分離
しているか否かを定義するものではない。The structure in which the flat plate portion (1) and the ridge portion (2) are separated from each other is manufactured by bonding or mechanically joining the electrodes after manufacturing them, and furthermore, by using different ridge portions having different structures. An electrode obtained by performing a carbonization treatment after bonding a flat plate portion before carbonization is also included, and the separated structure according to the present invention refers to whether a porous structure is separated or not, and It does not define whether they are separated or not.
【００１０】また、本発明は、突条部（２）の構造に於
て、中央部（６）の密度を側部（４）の密度より低くす
ることを特徴とする。そして、本発明に於て突条部
（２）の好ましい性質は、細い角柱（辺寸法が１〜２ｍ
ｍ、長さが１ｍ程度）を取扱うのに十分な曲げ強度を持
つこと、突条部の高さ方向に高い電気伝導性を有するこ
と、電解質の供給と貯蔵に適すること等を満足する多孔
質体であることである。Further, the present invention is characterized in that in the structure of the ridge portion (2), the density of the central portion (6) is lower than the density of the side portions (4). In the present invention, a preferable property of the ridge portion (2) is a thin prism (having a side dimension of 1 to 2 m).
m, the length is about 1m), which has sufficient bending strength, has high electrical conductivity in the height direction of the ridge, and is suitable for supplying and storing electrolyte. Being a body.
【００１１】本発明の突条部（２）の構造は図２に示す
如く、突条部を形成する角柱はその側部（４）は主とし
て突条部の高さ方向（５）に添った方向に配向方向を有
する炭素繊維からなる紙状物により構成され、側部に挟
まれた中央部（６）は主として突条部の長手方向（７）
に添った方向に配向方向を有する炭素繊維からなる紙状
物により構成されていることを特徴とするものである。As shown in FIG. 2, the structure of the ridge portion (2) of the present invention is such that the side portion (4) of the prism forming the ridge portion mainly follows the height direction (5) of the ridge portion. The central portion (6) sandwiched between the side portions is mainly composed of a paper-like material made of carbon fiber having an orientation direction in the longitudinal direction of the ridge portion (7).
Characterized by being made of a paper-like material made of carbon fiber having an orientation direction along the direction described in (1).
【００１２】配向方向を有する炭素繊維からなる紙状物
とは、特定の方向に対し±５°以内の方向に配向してい
る炭素繊維の重量が全体の繊維重量に対し（割合をパー
セントで示した配向度が）３０％以上９５％未満の紙状
物を意味し、配向性を有する紙状物は上記範囲の配向度
に於て良好な機械的性質と多孔質性が維持される。A paper-like material composed of carbon fibers having an orientation direction means that the weight of carbon fibers oriented in a direction within ± 5 ° with respect to a specific direction is expressed as a percentage of the total fiber weight. Means a paper-like material having a degree of orientation of 30% or more and less than 95%, and a paper-like material having an orientation maintains good mechanical properties and porosity in the above-mentioned range of orientation.
【００１３】図２に示された本発明の突条部（２）を形
成する角柱は、例えば図３に示す如く矢印（８）の方向
に配向方向を有する炭素繊維からなる紙状物の間に矢印
（９）の方向に配向方向を有する炭素繊維からなる紙状
物を積層して得た板状物を図の一点鎖線（１０）に添っ
て切断することによって得ることが出来る。この様にし
て得た本発明の突条部の構造は、突条部の高さ方向に配
向した繊維によって高い圧縮強度と、高さ方向の高い電
気伝導度を実現することが可能となり中央部を構成する
突条部の長手方向に配向した繊維により高い曲げ強度と
電解質の高い流動性を実現することが出来る。本発明の
構造によれば、特公平１−２９３０９号公報に記載され
ている如く緻密な異種の材料を配置する必要がなく、単
純な積層作業によって好ましい構造が得られる特徴があ
る。The prisms forming the ridges (2) of the present invention shown in FIG. 2 are formed, for example, as shown in FIG. 3 between paper-like objects made of carbon fibers having an orientation direction in the direction of arrow (8). Can be obtained by laminating a sheet-like material made of carbon fibers having an orientation direction in the direction of arrow (9) along the dashed line (10) in the figure. The structure of the ridge portion of the present invention obtained in this manner makes it possible to realize a high compressive strength and a high electrical conductivity in the height direction by fibers oriented in the height direction of the ridge portion. A high bending strength and a high fluidity of the electrolyte can be realized by the fibers oriented in the longitudinal direction of the ridges constituting the ridge. According to the structure of the present invention, it is not necessary to dispose dense different kinds of materials as described in Japanese Patent Publication No. 1-29309, and a preferable structure can be obtained by a simple laminating operation.
【００１４】本発明の突条部（２）の構造に於て中央部
（６）及び側部（４），（４）の構成は、例えば多孔質
性の維持、層間の強度向上等の理由により若干の無配向
の炭素繊維からなる紙状体或は反する配向方向の炭素繊
維からなる紙状体を含んで構成することを防げるもので
はない。In the structure of the ridge portion (2) of the present invention, the configuration of the central portion (6) and the side portions (4), (4) is based on, for example, reasons such as maintenance of porosity and improvement of strength between layers. However, this does not prevent the configuration including a paper-like body made of some non-oriented carbon fibers or a paper-like body made of carbon fibers in the opposite orientation direction.
【００１５】本発明の突条部（２）の構造に於て、中央
部（６）の密度が側部（４），（４）の密度より下げて
構成されていることによって中央部（６）のガス透過性
と電解質の保持量増加に有効である。In the structure of the ridge portion (2) of the present invention, the density of the central portion (6) is lower than that of the side portions (4) and (4). ) Is effective for increasing the gas permeability and the amount of retained electrolyte.
【００１６】このための手段としては、側部（４），
（４）と中央部（６）の樹脂含有率に予め差を設けて達
成する方法、側部と中央部に炭素化収率の異る樹脂を用
いる方法等がある。As means for this, side parts (4),
There is a method in which a difference is previously provided in the resin content between (4) and the central portion (6), and a method using resins having different carbonization yields in the side portion and the central portion.
【００１７】突条部（２）の中央部（６）と側部
（４），（４）の比率については特に限定するものでは
ないが中央部の厚さは、突条部（２）巾の１／３〜３／
４程度が一般的で圧縮強度、電気的特性、角柱の曲げ強
度等によって決定される。The ratio of the central portion (6) of the ridge portion (2) to the side portions (4) and (4) is not particularly limited, but the thickness of the central portion is determined by the width of the ridge portion (2) width. 1/3 to 3 /
Approximately four is generally determined by the compressive strength, electrical characteristics, bending strength of the prism, and the like.
【００１８】本発明の平板部（１）の構造を図４に示
す。本発明の平板部（１）に於ては平板部の全体又は一
部が配向性を有する炭素繊維からなる紙状物で構成さ
れ、平板部（１）が突条部（２）と接する表層（１３）
は突条部（２）の長手方向と交叉する方向（１１）に配
向方向を有する炭素繊維からなる紙状物で構成されてい
ることを特徴とする構造であって、この様な構造によ
り、ガス拡散（特に突条部下部）の向上と極板積層に係
る積層圧力を向上せしめることが可能となる。表層（１
３）の下部に位置する多孔質体（１２）の構成及び表層
（１３）の厚さについては特に限定されない。FIG. 4 shows the structure of the flat plate portion (1) of the present invention. In the flat plate portion (1) of the present invention, the whole or a part of the flat plate portion is formed of a paper-like material made of carbon fiber having orientation, and the flat plate portion (1) is in contact with the ridge portion (2). (13)
Is a paper-like material made of carbon fiber having an orientation direction in a direction (11) intersecting with the longitudinal direction of the ridge portion (2). It is possible to improve gas diffusion (especially at the lower part of the ridge) and increase the laminating pressure for laminating the electrode plates. Surface layer (1
The configuration of the porous body (12) located below 3) and the thickness of the surface layer (13) are not particularly limited.
【００１９】また、該下部構造は突条部（２）の長手方
向の平板部強度向上のためのこの方向に添った配向方向
を有する炭素繊維からなる紙状物、極大の多孔質性を維
持するための無配向の炭素繊維からなる紙状物等の積層
構造をとることが可能であるが、平板部の形態繊維（平
面性、低歪性）を考慮すると平板部（１）はその中心に
対し対称積層構造であることが好ましい。Further, the lower structure is a paper-like material made of carbon fibers having an orientation direction along this direction for improving the strength of the flat portion in the longitudinal direction of the ridge portion (2), and maintains maximum porosity. Although it is possible to adopt a laminated structure of a paper-like material made of non-oriented carbon fibers for the purpose of carrying out, the flat plate portion (1) is positioned at the center thereof in consideration of the form fiber (flatness, low distortion) of the flat plate portion. It is preferable to have a symmetric laminated structure.
【００２０】さらに、平板部（１）はガス拡散性が要求
される部位であり、平板部の機械的強度に寄与率の小さ
い中層部の密度を表層部及び下層部よりも低くすること
が電極性能の向上に効果的である。Further, the flat plate portion (1) is a region where gas diffusibility is required, and the density of the middle layer portion, which has a small contribution to the mechanical strength of the flat plate portion, is made lower than that of the surface layer portion and the lower layer portion. It is effective for improving performance.
【００２１】[0021]
【実施例】以下、本発明を実施例を挙げて説明する。 実施例１ 特開昭６０−１９９９９６号公報に記載されている方法
によって太さ７〜８μ、繊維長１０ｍｍ、弾性率２４ト
ン／ｍｍ2 の炭素繊維が紙状物の巾方向に８５％配向し
た目付１０ｇ／ｍ2 の炭素繊維からなる紙状物を得、次
いで１５ｇ／ｍ2 のエポキシ樹脂を含浸樹脂含有率６０
％のプリプレグとした。The present invention will be described below with reference to examples. Example 1 A carbon fiber having a thickness of 7 to 8 μm, a fiber length of 10 mm, and an elastic modulus of 24 ton / mm 2 was oriented 85% in the width direction of a paper-like material by the method described in JP-A-60-199996. A paper made of carbon fiber having a basis weight of 10 g / m 2 was obtained, and then an epoxy resin impregnated with 15 g / m 2 was used.
% Prepreg.
【００２２】このプリプレグを０°×８プライ／９０°
×１６プライ／０°×８プライの積層を行い、１ｋｇ／
ｃｍ2 の圧力下、１３０℃×９０分の樹脂硬化を行い厚
さ１．２ｍｍの成形板とした。次にこれをＮ2 ガス中で
２０００℃でエポキシ樹脂の炭化処理を行い、厚さ１４
ｍｍの炭素繊維が炭素で結着された多孔質板（以下Ｃ／
Ｃ多孔質板と称す）を得た。このＣ／Ｃ多孔質板の密度
は０．２６ｇ／ｃｍ3 であり、その空隙率は凡そ８６％
（計算による推定値）であった。This prepreg is placed at 0 ° × 8 plies / 90 °
× 16 plies / 0 ° × 8 plies are laminated and 1 kg /
The resin was cured at 130 ° C. for 90 minutes under a pressure of cm 2 to obtain a molded plate having a thickness of 1.2 mm. Next, this was carbonized at 2000 ° C. in N 2 gas to obtain a resin having a thickness of 14
mm carbon fiber bonded with carbon (hereinafter C /
C porous plate). The density of this C / C porous plate is 0.26 g / cm 3 , and its porosity is about 86%.
(Estimated value by calculation).
【００２３】次いで、このＣ／Ｃ多孔質板を外層部の繊
維配向方向（０°）と直交する方向（９０°）に巾１．
４ｍｍに裁断し、一辺が１．４ｍｍの角柱を得た。Next, the C / C porous plate was placed on the outer layer portion in the direction (90 °) orthogonal to the fiber orientation direction (0 °) with a width of 1.
It was cut to 4 mm to obtain a prism having a side of 1.4 mm.
【００２４】前記プリプレグを、０°×３プライ／９０
°／０°／９０°／０°／９０°／０°×３プライ計１
１プライの積層を行い、上記と同様の熱処理を行い厚さ
０．３５ｍｍの成形薄板とし、次いで上記と同様の炭化
処理を行って厚さ０．４ｍｍ、密度０．３２、空隙率８
２％のＣ／Ｃ多孔質板を得た。The prepreg was prepared as follows: 0 ° × 3 plies / 90
° / 0 ° / 90 ° / 0 ° / 90 ° / 0 ° x 3-ply total 1
One ply was laminated and subjected to the same heat treatment as above to form a molded thin plate having a thickness of 0.35 mm, and then subjected to the same carbonization treatment as described above to a thickness of 0.4 mm, a density of 0.32 and a porosity of 8
A 2% C / C porous plate was obtained.
【００２５】前記で得た一辺が１．４ｍｍの角柱を厚さ
０．４ｍｍの気体不透過性黒鉛板に角柱の側部の繊維配
向が黒鉛板に直交する（突条部の高さ方向となる）様
に、かつ、該角柱の長手方向が０．４ｍｍのＣ／Ｃ多孔
質板の表面の繊維配向と直交するようにグラファイト系
接着剤で３ｍｍピッチで並列に接着した。The thus obtained prism having a side of 1.4 mm and a gas-impermeable graphite plate having a thickness of 0.4 mm are perpendicular to the graphite plate at the side of the prism (the height direction of the ridge portion is perpendicular to the graphite plate). ), And the prisms were bonded in parallel at a pitch of 3 mm with a graphite-based adhesive such that the longitudinal direction of the prisms was orthogonal to the fiber orientation on the surface of the C / C porous plate of 0.4 mm.
【００２６】前記、厚さ０．４ｍｍのＣ／Ｃ多孔質板を
電極の平板部として用い、また１辺１．４ｍｍの断面を
有する角柱を突条部として用いたガス拡散電極は、取扱
い、及び積層に十部耐える機械的強度を有し、かつ電気
伝導性ガス拡散性能の優れたガス拡散電極であった。The gas diffusion electrode using the C / C porous plate having a thickness of 0.4 mm as a flat plate portion of the electrode and using a prism having a cross section of 1.4 mm on a side as a ridge portion is used. In addition, the gas diffusion electrode had mechanical strength enough to withstand the lamination of 10 parts and was excellent in electric conductive gas diffusion performance.
【００２７】実施例２ 実施例１で得た厚さ１．２ｍｍの樹脂硬化成形板を実施
例１と同様な方向に１．４ｍｍ巾に切断して断面が１．
２ｍｍ×１．４ｍｍの角柱とし、この角柱を実施例１で
得た厚さ０．３５ｍｍの成形薄板（未だ炭素化されない
状態）に、角柱の側部の繊維配向方向が成形薄板の表面
に直立する様にエポキシ樹脂で３ｍｍピッチで固定し、
突条部を形成した。Example 2 The resin cured molded plate having a thickness of 1.2 mm obtained in Example 1 was cut to a width of 1.4 mm in the same direction as in Example 1 so that the cross section was 1.
A prism having a size of 2 mm x 1.4 mm was formed. The prism was placed on the 0.35 mm-thick shaped thin plate (not yet carbonized) obtained in Example 1 with the fiber orientation direction of the side of the prism standing upright on the surface of the formed thin plate. And fix it with epoxy resin at 3mm pitch.
A ridge was formed.
【００２８】こうして製造した未炭素化状態の電極前駆
体を巾１．４ｍｍ、深さ１．４ｍｍの溝が３ｍｍピッチ
に刻まれた黒鉛板と平らな平面を有する黒鉛板の間に固
定し、その状態でエポキシ樹脂の炭化処理を行い平板部
に突条部が形成されたガス拡散電極を得た。The non-carbonized electrode precursor thus produced is fixed between a graphite plate having a groove of 1.4 mm in width and 1.4 mm in depth and having a pitch of 3 mm and a graphite plate having a flat surface. Then, carbonization treatment of the epoxy resin was performed to obtain a gas diffusion electrode having a ridge portion formed on a flat plate portion.
【００２９】実施例３ 実施例１で用いた１５ｇ／ｍ2 のエポキシ樹脂をマトリ
ックスとする炭素繊維／エポキシプリプレグと、マトリ
ックス樹脂をフェノール樹脂に変更した炭素繊維／フェ
ノールプリプレグの２種のプリプレグを作成した。Example 3 Two types of prepregs were prepared: a carbon fiber / epoxy prepreg having a matrix of 15 g / m 2 epoxy resin used in Example 1 and a carbon fiber / phenol prepreg having a matrix resin of phenol resin. did.
【００３０】実施例１の突条部を得るための積層板構成
（０°×８プライ／９０°×１６プライ／０°×８プラ
イ）の内側部を形成する０°×８プライの内の外側６プ
ライを炭素繊維／フェノールプリプレグ、残りの積層
（０°×２プライ／９０°×１６プライ／０°×２プラ
イ）を全て炭素繊維／エポキシプリプレグを用いて樹脂
の硬化を行い、さらに炭化処理を行い電極の突条部の側
部に相当するＣ／Ｃ多孔質板の表面の密度が高く内層部
の密度が低い構造のガス拡散電極を得た。（フェノール
樹脂とエポキシ樹脂の炭素化収率の異いによる。）Of the 0 ° × 8 plies forming the inner part of the laminated plate configuration (0 ° × 8 plies / 90 ° × 16 plies / 0 ° × 8 plies) for obtaining the ridges of Example 1 The outer 6 plies are carbon fiber / phenol prepreg, and the remaining lamination (0 ° × 2 plies / 90 ° × 16 plies / 0 ° × 2 plies) are all cured with carbon fiber / epoxy prepreg, and then carbonized. By performing the treatment, a gas diffusion electrode having a structure in which the surface density of the C / C porous plate corresponding to the side of the ridge portion of the electrode was high and the density of the inner layer portion was low was obtained. (Due to the difference in carbonization yield between phenolic resin and epoxy resin.)
【００３１】実施例４ 実施例１の電極の平板部に構成すべき厚さ０．３５ｍｍ
の成形薄板の製作に於て、薄板の内層部を形成する９０
°／０°／９０°／０°／９０°の５プライの代りに通
常の抄紙法により得られた１０ｇ／ｍ2 の炭素繊維が無
配向の状態である紙状物に１５ｇ／ｍ2 のエポキシ樹脂
を含浸せしめた。無配向炭素繊維／エポキシプリプレグ
を４プライ積層した成形薄板とした。この成形薄板を炭
化して得た０．４ｍｍのＣ／Ｃ多孔質薄板は、表層に対
して内層の密度の低い多孔質板であり、ガス拡散性能の
向上が期待されるものであった。Example 4 A thickness of 0.35 mm to be formed on the flat plate portion of the electrode of Example 1.
Forming the inner layer portion of the thin plate 90
10 g / m 2 of carbon fiber obtained by a normal papermaking method instead of 5 plies of ° / 0 ° / 90 ° / 0 ° / 90 ° was added to 15 g / m 2 of a paper-like material in an unoriented state. Epoxy resin impregnated. A molded thin plate was obtained by laminating non-oriented carbon fiber / epoxy prepreg in four plies. The 0.4 mm C / C porous thin plate obtained by carbonizing this molded thin plate was a porous plate having a lower inner layer density than the surface layer, and was expected to have improved gas diffusion performance.
【００３２】またこの様な製造法を採用するとき平板部
に強度上の異方性（例えば本実施例の平板部の積層構
成）がある場合突条部の長手方向の強度が利用出来るの
で特に有益な製法上の利点となる。Further, when such a manufacturing method is adopted, if the flat portion has anisotropy in strength (for example, the laminated structure of the flat portion in this embodiment), the strength in the longitudinal direction of the ridge portion can be used, so that it is particularly useful. A beneficial manufacturing advantage.
【００３３】[0033]
【発明の効果】本発明のガス拡散電極は、電極の機械的
強度ガス拡散性能、電気伝導性に優れ、又ガス拡散電極
を経済的に得ることが可能となった。According to the gas diffusion electrode of the present invention, the mechanical strength of the electrode is excellent in gas diffusion performance and electric conductivity, and the gas diffusion electrode can be obtained economically.
【図１】本発明のガス拡散電極の部分外観模式図であ
る。FIG. 1 is a schematic view of a partial external appearance of a gas diffusion electrode of the present invention.
【図２】突条部の繊維配向方向と一部積層構造を示す外
観模式図。FIG. 2 is a schematic external view showing a fiber orientation direction of a ridge portion and a partially laminated structure.
【図３】突条部の製作法を示す部分外観模式図。FIG. 3 is a schematic partial external view showing a method of manufacturing a ridge.
【図４】平板部の繊維配向方向と積層構造を示す部分外
観模式図。FIG. 4 is a schematic partial appearance view showing a fiber orientation direction and a laminated structure of a flat plate portion.
【図５】従来のガス拡散電極の構造を示す部分外観模式
図である。FIG. 5 is a schematic partial external view showing the structure of a conventional gas diffusion electrode.
１ 平板部 １−２ ガス流路 １−３ 触媒層 ２ 突条部 ３ セパレータ ４ 側部 ６ 中央部 １２ 多孔質体 １３ 表層 DESCRIPTION OF SYMBOLS 1 Flat plate part 1-2 Gas flow path 1-3 Catalyst layer 2 Ridge part 3 Separator 4 Side part 6 Central part 12 Porous body 13 Surface layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−253768（ＪＰ，Ａ) 特開 昭63−64268（ＪＰ，Ａ) 特開 昭60−62062（ＪＰ，Ａ) 特開 昭51−14969（ＪＰ，Ａ) 特開 昭53−101080（ＪＰ，Ａ) 特開 昭63−303732（ＪＰ，Ａ) 実開 昭61−201814（ＪＰ，Ｕ) 国際公開91／6131（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 4/96 H01M 4/88 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-253768 (JP, A) JP-A-63-64268 (JP, A) JP-A-60-62062 (JP, A) JP-A 51- 14969 (JP, A) JP-A-53-101080 (JP, A) JP-A-63-303732 (JP, A) JP-A-61-201814 (JP, U) International publication 91/6131 (WO, A1) ( 58) Field surveyed (Int.Cl. 7 , DB name) H01M 4/96 H01M 4/88
Claims (4)
るガス流路とを有するガス拡散電極に於て、突条部と平
板部が構造的に分離されており、且つ、突条部の中央部
の密度が側部よりも低いことを特徴とするガス拡散電
極。1. A gas diffusion electrode having a ridge on a flat plate and a gas flow path formed between the ridges, wherein the ridge and the flat plate are structurally separated, and A gas diffusion electrode, wherein the density of the central portion of the ridge portion is lower than that of the side portion.
する炭素繊維からなる紙状物により構成され、突条部の
側部は突条部の高さ方向に配向を有する炭素繊維からな
る紙状物で構成され、且つ、突条部の中央部は主として
突条部の長手方向に配向方向を有する炭素繊維からなる
紙状物で構成されていることを特徴とする請求項１記載
のガス拡散電極。2. The whole or a part of the ridge portion is made of a paper-like material made of carbon fiber having orientation, and the side portion of the ridge portion has carbon fiber oriented in the height direction of the ridge portion. And a central portion of the ridge portion is mainly formed of a carbon fiber having an orientation direction in a longitudinal direction of the ridge portion. The gas diffusion electrode as described in the above.
条部の接する表層よりも低いことを特徴とする請求項１
記載のガス拡散電極。3. The flat layer according to claim 1, wherein the density of the central layer is lower than that of the surface layer where the flat section and the ridge are in contact.
The gas diffusion electrode as described in the above.
する炭素繊維からなる紙状物により構成され、突条部の
側部は突条部の高さ方向に配向を有する炭素繊維からな
る紙状物で構成され、突条部の中央部は主として突条部
の長手方向に配向方向を有する炭素繊維からなる紙状物
で構成され、且つ、平板部の中央層の密度が平板部と突
条部の接する表層よりも低いことを特徴とする請求項１
記載のガス拡散電極。4. A carbon fiber in which the whole or a part of the ridge is made of a paper-like material made of carbon fiber having an orientation, and a side of the ridge is oriented in a height direction of the ridge. The central portion of the ridge portion is mainly composed of a paper-like material made of carbon fiber having an orientation direction in the longitudinal direction of the ridge portion, and the density of the central layer of the flat portion is flat. 2. The structure according to claim 1, wherein the surface is lower than a surface layer where the ridge and the ridge are in contact.
The gas diffusion electrode as described in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32655291A JP3342707B2 (en) | 1991-11-14 | 1991-11-14 | Gas diffusion electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32655291A JP3342707B2 (en) | 1991-11-14 | 1991-11-14 | Gas diffusion electrode |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001077141A Division JP3450834B2 (en) | 2001-03-16 | 2001-03-16 | Gas diffusion electrode and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05135775A JPH05135775A (en) | 1993-06-01 |
| JP3342707B2 true JP3342707B2 (en) | 2002-11-11 |
Family
ID=18189104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32655291A Expired - Fee Related JP3342707B2 (en) | 1991-11-14 | 1991-11-14 | Gas diffusion electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3342707B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5949744B2 (en) * | 2012-08-30 | 2016-07-13 | カシオ計算機株式会社 | Hands and clock |
| JP5447900B1 (en) | 2012-08-30 | 2014-03-19 | カシオ計算機株式会社 | Guidelines |
| CN111600087B (en) * | 2020-05-29 | 2022-10-04 | 重庆长安新能源汽车科技有限公司 | Reference electrode and three-electrode system for lithium ion battery detection and preparation method thereof |
-
1991
- 1991-11-14 JP JP32655291A patent/JP3342707B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05135775A (en) | 1993-06-01 |
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