JPH05283082A - Gas diffused electrode and manufacture thereof - Google Patents
Gas diffused electrode and manufacture thereofInfo
- Publication number
- JPH05283082A JPH05283082A JP4080958A JP8095892A JPH05283082A JP H05283082 A JPH05283082 A JP H05283082A JP 4080958 A JP4080958 A JP 4080958A JP 8095892 A JP8095892 A JP 8095892A JP H05283082 A JPH05283082 A JP H05283082A
- Authority
- JP
- Japan
- Prior art keywords
- gas diffusion
- gas
- polytetrafluoroethylene
- carbon black
- reaction layer
- 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.)
- Pending
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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は固体高分子電解質型燃料
電池に用いるガス拡散電極及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas diffusion electrode used in a solid polymer electrolyte fuel cell and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、上記燃料電池用のガス拡散電極と
しては親水性カーボンブラック、ポリ四弗化エチレンよ
りなる親水性シートと、撥水性カーボンブラック、ポリ
四弗化エチレンよりなる撥水性シートを圧着、圧延を複
数回繰り返して成形してなるものである。すなわち、従
来の該ガス拡散電極は親水性カーボンブラック／ポリ四
弗化エチレン（重量比で８０／２０〜５０／５０、好ま
しくは７０／３０〜６０／４０）を界面活性剤と共に溶
媒に攪拌、混合してスラリ化し、ろ過、乾燥、微粉化し
て再度溶媒を加えて混練してロール機で圧延して得た反
応層となる親水性シート（０．２〜０．４ｍｍ厚さ）
と、撥水性カーボンブラック／ポリ四弗化エチレン（重
量比で８０／２０〜５０／５０、好ましくは７５／２５
〜６０〜４０）を界面活性と共に溶媒に攪拌、混合して
スラリ化し、凝集化、ろ過、澱粉化して再度溶媒を加え
て混練してロール機で圧延して得たガス拡散層となる撥
水性シート（０．５〜２ｍｍ厚さ）とを重ね合せ、ロー
ル機で圧延して０．５〜０．８ｍｍ厚さのものとし、乾
燥、脱界面活性剤として製造されていた。2. Description of the Related Art Conventionally, as a gas diffusion electrode for a fuel cell, a hydrophilic sheet made of hydrophilic carbon black and polytetrafluoroethylene and a water repellent sheet made of water repellent carbon black and polytetrafluoroethylene are used. It is formed by repeating pressure bonding and rolling a plurality of times. That is, in the conventional gas diffusion electrode, hydrophilic carbon black / polytetrafluoroethylene (weight ratio 80/20 to 50/50, preferably 70/30 to 60/40) is stirred in a solvent together with a surfactant, A hydrophilic sheet (0.2 to 0.4 mm thick) that becomes a reaction layer obtained by mixing and slurrying, filtering, drying, and pulverizing, adding a solvent again and kneading and rolling with a roll machine.
And water-repellent carbon black / polytetrafluoroethylene (weight ratio 80/20 to 50/50, preferably 75/25
-60 to 40) is stirred and mixed with a solvent together with a surface active agent to form a slurry, which is agglomerated, filtered, made into starch, added again with a solvent, kneaded, and rolled into a gas diffusion layer obtained by rolling with a roll machine. The sheet (0.5 to 2 mm thick) was overlaid and rolled by a rolling machine to a thickness of 0.5 to 0.8 mm, which was then manufactured as a drying and desurfactant.
【０００３】このように従来の燃料電池用のガス拡散電
極は親水性シートと撥水性シートを重ね合せる前又は後
の厚みを圧延比率をコントロールすることにより、反応
層（親水性シート）と拡散層（撥水性シート）の層厚を
変化させることが行われていた。As described above, in the conventional gas diffusion electrode for a fuel cell, the reaction layer (hydrophilic sheet) and the diffusion layer are controlled by controlling the rolling ratio before or after the hydrophilic sheet and the water-repellent sheet are superposed. The layer thickness of the (water repellent sheet) has been changed.
【０００４】[0004]
【発明が解決しようとする課題】上記従来のガス拡散電
極のガス拡散層は撥水性カーボンブラック、ポリ四弗化
エチレンの混合物をロール法等を用いて圧延し、シート
状に形成されたものであり、ガス拡散通路が十分に確保
されておらず、かつ結着剤としてポリ四弗化エチレンを
含有するため電気伝導性を低下させるという欠点があっ
た。また、反応層においても親水性カーボンブラック、
ポリ四弗化エチレンの混合物をガス拡散層と同様にシー
ト状に形成されたものであり、ロール法等の圧延による
反応層の厚みに限界があり、反応層のガス拡散性に大き
く影響していた。特に、上記従来のガス拡散電極を固体
高分子電解質型燃料電池の空気極側のガス拡散電極とし
て用いた場合には、ガス拡散性の燃料電気の性能に与え
る影響は大きいものがあった。The gas diffusion layer of the conventional gas diffusion electrode is formed by rolling a mixture of water-repellent carbon black and polytetrafluoroethylene by a roll method or the like into a sheet. However, the gas diffusion passage is not sufficiently secured, and since polytetrafluoroethylene is contained as a binder, there is a drawback that electrical conductivity is lowered. Also in the reaction layer, hydrophilic carbon black,
A mixture of polytetrafluoroethylene was formed into a sheet like the gas diffusion layer, and the thickness of the reaction layer due to rolling such as the roll method is limited, which greatly affects the gas diffusion of the reaction layer. It was In particular, when the above-mentioned conventional gas diffusion electrode is used as the gas diffusion electrode on the air electrode side of a solid polymer electrolyte fuel cell, there is a great effect on the gas-diffusible fuel-electric performance.
【０００５】本発明は上記技術水準に鑑み、従来の固体
高分子電解質型燃料電池に用いられているガス拡散電極
の有する不具合を解消した固体高分子電解質型燃料電池
用ガス拡散電極及びその製造方法を提供しようとするも
のである。In view of the above-mentioned state of the art, the present invention solves the problems of the gas diffusion electrode used in the conventional solid polymer electrolyte fuel cell, and a gas diffusion electrode for a solid polymer electrolyte fuel cell, and a method for producing the same. Is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明は （１）撥水性を有する多孔性炭素基材からなるガス拡散
層と、該ガス拡散層上に設けられた親水性カーボンブラ
ックとポリ四弗化エチレンからなる反応層を具備するこ
とを特徴とする固体高分子電解質型燃料電池用ガス拡散
電極。The present invention provides (1) a gas diffusion layer made of a porous carbon substrate having water repellency, a hydrophilic carbon black and polytetrafluoroethylene provided on the gas diffusion layer. A gas diffusion electrode for a solid polymer electrolyte fuel cell, comprising a reaction layer comprising
【０００７】（２）撥水性を有する多孔性炭素基材から
なるガス拡散層上に、親水性カーボンブラックとポリ四
弗化エチレンからなるシート状の反応層をホットプレス
法により圧着することを特徴とする固体高分子電解質型
燃料電池用ガス拡散電極の製造方法。(2) A sheet-like reaction layer made of hydrophilic carbon black and polytetrafluoroethylene is pressure-bonded onto the gas diffusion layer made of a porous carbon substrate having water repellency by a hot pressing method. And a method for producing a gas diffusion electrode for a solid polymer electrolyte fuel cell.
【０００８】（３）撥水性を有する多孔性炭素基材から
なるガス拡散層上に、親水性カーボンブラックとポリ四
弗化エチレンからなるスラリ状の反応層材を塗布、担持
後、乾燥、焼成することを特徴とする固体高分子電解質
型燃料電池用ガス拡散電極の製造方法。 である。(3) A slurry-like reaction layer material composed of hydrophilic carbon black and polytetrafluoroethylene is applied on a gas diffusion layer composed of a porous carbon base material having water repellency, carried, dried and fired. A method for producing a gas diffusion electrode for a polymer electrolyte fuel cell, comprising: Is.
【０００９】本発明のガス拡散層となる撥水性を有する
多孔性炭素基材とは炭素繊維織物、カーボンペーパーな
どの多孔性カーボン材をポリ四弗化エチレンを含浸、担
持させて撥水性を付与したものをいう。多孔性炭素基材
としては、一般的に体積固有抵抗：１０-3〜１０-1Ω−
ｃｍ、好ましくは１０-2〜１０-3Ω−ｃｍ、平均気孔
径：１〜２００μｍ、好ましくは３０〜１５０μｍ、気
孔率：２０〜８０％、好ましくは５０〜７０％、厚み：
０．５〜５ｍｍ、好ましくは０．７〜２ｍｍのものが使
用される。The water-repellent porous carbon base material which serves as the gas diffusion layer of the present invention is provided with water repellency by impregnating and supporting polytetrafluoroethylene on a porous carbon material such as carbon fiber woven fabric or carbon paper. I say what I did. As a porous carbon substrate, generally, volume resistivity: 10 −3 to 10 −1 Ω−
cm, preferably 10 −2 to 10 −3 Ω-cm, average pore diameter: 1 to 200 μm, preferably 30 to 150 μm, porosity: 20 to 80%, preferably 50 to 70%, thickness:
One having a thickness of 0.5 to 5 mm, preferably 0.7 to 2 mm is used.
【００１０】また、本発明の反応層の材料となる親水性
カーボンブラックは通常用いられているもの、例えばバ
ルカンＸＣ−７２Ｒ（商品名：Ｃａｂｏｔ社製）が使用
され、反応層としては親水性カーボンブラック／ポリ四
弗化エチレン（重量比）＝８０／２０〜５０／５０、好
ましくは７０／３０〜６０／４０の配合割合のものが使
用され、反応層の層厚みは一般的に２０〜２００μｍ、
好ましくは４０〜１００μｍのものが使用される。The hydrophilic carbon black used as the material of the reaction layer of the present invention is a commonly used one, for example, Vulcan XC-72R (trade name: manufactured by Cabot), and the reaction layer is made of hydrophilic carbon black. A blending ratio of black / polytetrafluoroethylene (weight ratio) = 80/20 to 50/50, preferably 70/30 to 60/40 is used, and the layer thickness of the reaction layer is generally 20 to 200 μm. ,
It is preferably 40 to 100 μm.
【００１１】[0011]
【作用】本発明のガス拡散電極は、ガス拡散層として多
孔性炭素基材を用いているので、十分なガス拡散通路が
確保された構造となっているので、固体高分子電解質燃
料電池に使用した場合、ガス拡散性が向上し、単位面積
当りの流れる電流が著しく大きいものとなる。The gas diffusion electrode of the present invention uses a porous carbon base material as a gas diffusion layer, and therefore has a structure in which sufficient gas diffusion passages are secured, so that it is used in a solid polymer electrolyte fuel cell. In that case, the gas diffusivity is improved, and the current flowing per unit area becomes extremely large.
【００１２】[0012]
（実施例１）平均気孔径：４０μｍ、気孔率：６５％、
固有抵抗：２×１０-2Ω−ｃｍである多孔性炭素質基体
をポリ四弗化エチレンにより防湿化処理を施しガス拡散
層を得た。また、平均粒径：４００Åの親水性カーボン
ブラックと平均粒径：０．３μｍのポリ四弗化エチレン
を重量比７０：３０の割合で混合し、それにソルベント
ナフサを１：１．９の比率が混合してロール法により、
圧延成形し、厚さ：０．２ｍｍのシートに成形された反
応層を得た。(Example 1) Average pore diameter: 40 μm, porosity: 65%,
A gas diffusion layer was obtained by subjecting a porous carbonaceous substrate having a specific resistance of 2 × 10 -2 Ω-cm to a moisture-proof treatment with polytetrafluoroethylene. Further, hydrophilic carbon black having an average particle diameter of 400Å and polytetrafluoroethylene having an average particle diameter of 0.3 μm are mixed in a weight ratio of 70:30, and solvent naphtha is mixed in a ratio of 1: 1.9. By mixing and rolling,
Roll forming was performed to obtain a reaction layer formed into a sheet having a thickness of 0.2 mm.
【００１３】次に、上記ガス拡散層と反応層を重ねて３
８０℃、１８０ｋｇ／ｃｍ2 Ｇでホットプレスし、ガス
拡散電極１を得た。Next, the gas diffusion layer and the reaction layer are overlapped to form 3 layers.
Gas pressing electrode 1 was obtained by hot pressing at 80 ° C. and 180 kg / cm 2 G.
【００１４】（比較例１）比較のために、平均粒径：４
２０Åの撥水性カーボンブラックに平均粒径：０．３ｍ
ｍのポリ四弗化エチレンを重量比６５：３５の割合で混
合し、それにソルベントナフサを１：１．６の比率で混
合し、ロール法で圧延成形し、厚さ：１ｍｍのシートに
成形されたガス拡散層を得た。また、実施例１と同様に
して反応層を得た。次に、上記ガス拡散層と反応層を重
ねて、３８０℃、１８０ｋｇ／ｃｍ 2 Ｇでホットプレス
しガス拡散電極２を得た。Comparative Example 1 For comparison, average particle size: 4
20Å water repellent carbon black with an average particle size of 0.3 m
m polytetrafluoroethylene was mixed at a weight ratio of 65:35.
And mix it with solvent naphtha at a ratio of 1: 1.6.
Combined, roll-formed by roll method, thickness: 1mm sheet
A molded gas diffusion layer was obtained. Also, as in Example 1.
The reaction layer was obtained. Next, stack the gas diffusion layer and the reaction layer
Hey, 380 ℃, 180kg / cm 2Hot press with G
Then, the gas diffusion electrode 2 was obtained.
【００１５】（比較例２）さらに比較のために、比較例
１と同様にしてガス拡散層を得、実施例１と同様にして
反応層を得、このガス拡散層と反応層を重ねてロール法
により圧着、圧延を繰り返し、ガス拡散電極３を得た。(Comparative Example 2) For further comparison, a gas diffusion layer was obtained in the same manner as in Comparative Example 1 and a reaction layer was obtained in the same manner as in Example 1. The gas diffusion layer and the reaction layer were stacked and rolled. By repeating pressure bonding and rolling by the method, a gas diffusion electrode 3 was obtained.
【００１６】こうして作ったガス拡散電極１，２及び３
のガス拡散性の評価方法として図１に略記される試験セ
ルを作製し、ガス拡散電極を隔てて片側に酸素ガス（ヘ
リウムキャリヤーガス）を、もう一方に純ヘリウムガス
を流し、酸素ガスの純ヘリウム気流中への拡散をガスク
ロマトグラフにてセルの出口２ケ所の分析ガスを測定し
ガス拡散性を評価した。このように求めたガス拡散性の
結果を、酸素のガス拡散定数として表１に示す。The gas diffusion electrodes 1, 2 and 3 thus produced
As a method for evaluating the gas diffusivity of the above, a test cell, which is schematically shown in FIG. The gas diffusivity was evaluated by measuring the analysis gas at the two outlets of the cell using a gas chromatograph to measure the diffusion into the helium flow. The results of the gas diffusivity thus obtained are shown in Table 1 as oxygen gas diffusion constants.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１の結果から、上記ガス拡散定数は実用
電極における限界電流密度に対応することから本発明の
ガス拡散電極はガス拡散性が向上し、ガス拡散電極とし
て単位面積当りの流れる電流が大きい効果がある。From the results shown in Table 1, since the gas diffusion constant corresponds to the limiting current density in the practical electrode, the gas diffusion electrode of the present invention has improved gas diffusivity, and the current flowing per unit area as the gas diffusion electrode is increased. It has a great effect.
【００１９】また、上記実施例では溶媒としてソルベン
トナフサを使用したが、これに限るものではなく水やエ
タノール、イソプロピルアルコール類やｎ−ブタン等の
炭化水素でもよく、さらに界面活性剤の添加を行っても
よい。Further, although solvent naphtha was used as the solvent in the above examples, the solvent is not limited to this, and water, ethanol, isopropyl alcohols, hydrocarbons such as n-butane may be used, and a surfactant is further added. May be.
【００２０】（実施例２）平均気孔径：６０〜１２０μ
ｍ、気孔率：７５％、固有抵抗：２×１０-2Ω−ｃｍで
ある多孔性炭素質基体をポリ四弗化エチレンにより防湿
化処理を施し、ガス拡散層を得た。また、平均粒径：４
００Åの親水性カーボンブラックと平均粒径：０．３μ
ｍのポリ四弗化エチレンを重量比５０：５０の割合で混
合し、それに水及び界面活性剤を加えてスラリを得た。
このスラリを上記ガス拡散層上にドクターブレード法に
より塗布した後、乾燥し、２５０〜３００℃の低酸素雰
囲気下で焼成し反応層の厚さ：２０μｍのガス拡散電極
４を得た。(Example 2) Average pore diameter: 60 to 120 μm
m, porosity: 75%, specific resistance: 2 × 10 −2 Ω-cm, a porous carbonaceous substrate was subjected to a moisture-proof treatment with polytetrafluoroethylene to obtain a gas diffusion layer. Also, the average particle size: 4
00Å hydrophilic carbon black and average particle size: 0.3μ
Polytetrafluoroethylene of m was mixed in a weight ratio of 50:50, and water and a surfactant were added thereto to obtain a slurry.
The slurry was applied onto the gas diffusion layer by the doctor blade method, dried, and fired in a low oxygen atmosphere at 250 to 300 ° C. to obtain a gas diffusion electrode 4 having a reaction layer thickness of 20 μm.
【００２１】（実施例３）また、上記実施例２と同様に
して反応層の厚さ：４０μｍのガス拡散電極５を得た。(Example 3) In the same manner as in Example 2 above, a gas diffusion electrode 5 having a reaction layer thickness of 40 µm was obtained.
【００２２】（比較例３）平均粒径：４２０Åの撥水性
カーボンブラックと平均粒径：０．３ｍｍのポリ四弗化
エチレンを重量比６５：３５の割合で混合し、それにソ
ルベントナフサを１：１．６の比率で混合し、ロール法
で圧延成形し、厚さ：１ｍｍのシートに成形されたガス
拡散層を得た。また、平均粒径：４００Åの親水性カー
ボンブラックと平均粒径：０．３ｍｍのポリ四弗化エチ
レンを重量比５０：５０の割合で混合し、それにソルベ
ントナフサを１：１．８の比率で混合し、ロール法によ
り圧延成形し、厚さ：０．２ｍｍのシートに成形された
反応層を得た。(Comparative Example 3) Water-repellent carbon black having an average particle diameter of 420Å and polytetrafluoroethylene having an average particle diameter of 0.3 mm were mixed at a weight ratio of 65:35, and solvent naphtha was mixed with 1 :. The mixture was mixed at a ratio of 1.6 and roll-molded by a roll method to obtain a gas diffusion layer molded into a sheet having a thickness of 1 mm. Further, hydrophilic carbon black having an average particle size of 400Å and polytetrafluoroethylene having an average particle size of 0.3 mm are mixed in a weight ratio of 50:50, and solvent naphtha is mixed in a ratio of 1: 1.8. The mixture was mixed and roll-formed by a roll method to obtain a reaction layer formed into a sheet having a thickness of 0.2 mm.
【００２３】次に、上記ガス拡散層と反応層を重ねてロ
ール法により圧着、圧延を繰り返し、反応層１５０μｍ
のガス拡散電極６を得た。Next, the gas diffusion layer and the reaction layer were overlaid, and pressure bonding and rolling were repeated by a roll method to obtain a reaction layer of 150 μm.
The gas diffusion electrode 6 of was obtained.
【００２４】上記実施例２，３及び比較例３にて作った
ガス拡散電極４，５及び６中のガス拡散性の評価方法と
して、前記図１に略記した試験セルを作製し、ガス拡散
電極を隔てて片側に酸素ガス（ヘリウムガスキャリヤ
ー）を、もう一方に純ヘリウムガスを流し、酸素ガスの
純ヘリウム気流中への拡散をガスクロマトグラフにて、
セルの出口の２ケ所の分析ガスを測定しガス拡散性を評
価した。このようにして求めたガス拡散性の結果を酸素
のガス拡散定数として表２に示す。As a method for evaluating the gas diffusivity in the gas diffusion electrodes 4, 5 and 6 produced in Examples 2 and 3 and Comparative Example 3 described above, the test cell outlined in FIG. Oxygen gas (helium gas carrier) is made to flow on one side across and the pure helium gas is made to flow on the other side, and the diffusion of oxygen gas into the pure helium flow is analyzed by gas chromatography.
The gas diffusivity was evaluated by measuring the analysis gas at two locations at the outlet of the cell. The gas diffusivity results thus obtained are shown in Table 2 as oxygen gas diffusion constants.
【００２５】[0025]
【表２】 [Table 2]
【００２６】（実験例）実施例２，３及び比較例３で作
ったガス拡散電極４，５及び６上に白金を吸引塗布し、
酸化、還元処理を行い、電極の見かけ表面積当り２ｍｇ
の白金触媒を担持した触媒担持電極１，２及び３を得
た。さらに、固体高分子電解質膜（例えば、Ｎａｆｉｏ
ｎＲ１１７：商品名）と触媒担持電極１，２及び３をホ
ットプレス法により、それぞれセル１，２及び３を得
た。(Experimental Example) Platinum was suction coated on the gas diffusion electrodes 4, 5 and 6 prepared in Examples 2 and 3 and Comparative Example 3,
2 mg per apparent surface area of the electrode after oxidation and reduction treatment
Catalyst-supporting electrodes 1, 2 and 3 carrying the platinum catalyst of No. 1 were obtained. Furthermore, a solid polymer electrolyte membrane (for example, Nafio
nR117: trade name) and catalyst-supporting electrodes 1, 2 and 3 were obtained by hot pressing to obtain cells 1, 2 and 3, respectively.
【００２７】上記セル１，２及び３の単セル発電テスト
（燃料：水素、酸化剤：空気）を行った結果を表３に示
す。Table 3 shows the results of the single cell power generation test (fuel: hydrogen, oxidizer: air) of the above cells 1, 2 and 3.
【００２８】[0028]
【表３】 [Table 3]
【００２９】表３の結果より、本発明のガス拡散電極を
用いたセルの発電性能は向上していることが明らかにな
った。From the results shown in Table 3, it was revealed that the power generation performance of the cell using the gas diffusion electrode of the present invention was improved.
【００３０】固体高分子電解質燃料電池の発電特性はア
ノード極（水素極）における活性化過電圧及び物質移動
過電圧を無視するという仮定の上で次式で示される。 Ｅ＝Ｅ0 −ｂｌｏｇｉ−ｉＲ 上式において、Ｅ0 ：触媒活性を考慮した平衡電位、
ｂ：ターフェル係数、Ｒ：内部抵抗｛電解質抵抗、オー
ム損集電抵抗物質移動（主に反応層）抵抗、ｉ：電流密
度｝を表わす。ターフェル係数ｂは反応層における構造
因子によるものであり、理想的にはｂ＝０である。すな
わち、ｂが小さいということは反応層中のガス拡散性が
よいということを示す。The power generation characteristics of the solid polymer electrolyte fuel cell are expressed by the following equation on the assumption that the activation overvoltage and the mass transfer overvoltage at the anode (hydrogen electrode) are ignored. E = E 0 -blogi-iR In the above equation, E 0 : equilibrium potential in consideration of catalytic activity,
b: Tafel coefficient, R: internal resistance {electrolyte resistance, ohmic loss current collecting resistance mass transfer (mainly reaction layer) resistance, i: current density}. The Tafel coefficient b is due to the structure factor in the reaction layer, and ideally b = 0. That is, the fact that b is small means that the gas diffusion property in the reaction layer is good.
【００３１】上記表３の発電テスト結果を上記式によっ
て解析した結果を表４に示す。Table 4 shows the result of analyzing the power generation test result of Table 3 by the above formula.
【００３２】[0032]
【表４】 [Table 4]
【００３３】表４の結果から本発明によって反応層厚み
を薄くできることから反応層におけるガス拡散性が向上
していることが明らかになった。From the results shown in Table 4, it is clear that the present invention can reduce the thickness of the reaction layer, and thus the gas diffusivity in the reaction layer is improved.
【００３４】また、上記実施例２おいて、スラリの溶媒
として水及び界面活性剤を使用したが、これに限るもの
ではなく、エタノール、イソプロピルアルコール類やｎ
−ブタン類の炭化水素でもよい。Although water and a surfactant were used as the solvent for the slurry in Example 2 above, the present invention is not limited to this, and ethanol, isopropyl alcohol and n are used.
-Butane hydrocarbons may also be used.
【００３５】[0035]
【発明の効果】以上、詳述したように、本発明によれば
ガス拡散性の高いガス拡散電極を提供することができ
る。As described above in detail, according to the present invention, a gas diffusion electrode having high gas diffusivity can be provided.
【図１】本発明のガス拡散電極のガス拡散評価用の試験
セルの概略説明図FIG. 1 is a schematic explanatory view of a test cell for evaluating gas diffusion of a gas diffusion electrode of the present invention.
Claims (3)
ガス拡散層と、該ガス拡散層上に設けられた親水性カー
ボンブラックとポリ四弗化エチレンからなる反応層を具
備することを特徴とする固体高分子電解質型燃料電池用
ガス拡散電極。1. A gas diffusion layer comprising a porous carbon substrate having water repellency and a reaction layer comprising hydrophilic carbon black and polytetrafluoroethylene provided on the gas diffusion layer. A gas diffusion electrode for a solid polymer electrolyte fuel cell.
ガス拡散層上に、親水性カーボンブラックとポリ四弗化
エチレンからなるシート状の反応層をホットプレス法に
より圧着することを特徴とする固体高分子電解質型燃料
電池用ガス拡散電極の製造方法。2. A sheet-like reaction layer made of hydrophilic carbon black and polytetrafluoroethylene is press-bonded onto the gas diffusion layer made of a porous carbon substrate having water repellency by a hot pressing method. Method for producing gas diffusion electrode for polymer electrolyte fuel cell.
ガス拡散層上に、親水性カーボンブラックとポリ四弗化
エチレンからなるスラリ状の反応層材を塗布、担持後、
乾燥、焼成することを特徴とする固体高分子電解質型燃
料電池用ガス拡散電極の製造方法。3. A slurry-like reaction layer material composed of hydrophilic carbon black and polytetrafluoroethylene is applied and carried on a gas diffusion layer composed of a porous carbon substrate having water repellency,
A method for producing a gas diffusion electrode for a solid polymer electrolyte fuel cell, which comprises drying and firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4080958A JPH05283082A (en) | 1992-04-02 | 1992-04-02 | Gas diffused electrode and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4080958A JPH05283082A (en) | 1992-04-02 | 1992-04-02 | Gas diffused electrode and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05283082A true JPH05283082A (en) | 1993-10-29 |
Family
ID=13733024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4080958A Pending JPH05283082A (en) | 1992-04-02 | 1992-04-02 | Gas diffused electrode and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05283082A (en) |
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