JP3313238B2 - Gas diffusion electrode - Google Patents
Gas diffusion electrodeInfo
- Publication number
- JP3313238B2 JP3313238B2 JP11437094A JP11437094A JP3313238B2 JP 3313238 B2 JP3313238 B2 JP 3313238B2 JP 11437094 A JP11437094 A JP 11437094A JP 11437094 A JP11437094 A JP 11437094A JP 3313238 B2 JP3313238 B2 JP 3313238B2
- Authority
- JP
- Japan
- Prior art keywords
- diffusion electrode
- gas diffusion
- gas
- peripheral portion
- fluororesin
- 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
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- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電解用電極として用い
られるガス拡散電極に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas diffusion electrode used as an electrode for electrolysis.
【０００２】[0002]
【従来の技術】ガス拡散電極41は、気液相反応を効率よ
く行うためのもので、従来、例えば図８に示すように、
親水性カーボンブラック（表面炭素に−Ｏ、−ＯＨ、−
ＣＯＯＨ基等が多く存在し、水との接触角が90°未満の
もの）とポリテトラフルオロエチレン（ＰＴＦＥ）等の
フッ素樹脂とからなり、かつ白金（Ｐｔ）等の触媒を担
持した多孔性の反応層41ａ、及び撥水性カーボンブラッ
ク（グラファイト化が進行し、水素原子が表面炭素と結
合しており、水との接触角が90°以上のもの）とフッ素
樹脂とからなり、かつニッケルメッシュ等の集電体41ｂ
を介挿した多孔性のガス拡散層41ｃを接合して構成され
ており、電解液及び反応ガスを給排するセルセグメント
42ａ、42ｂに狭持されて電解槽43を構成する。図８にお
いて44は対極である。2. Description of the Related Art A gas diffusion electrode 41 is used for efficiently performing a gas-liquid phase reaction. Conventionally, for example, as shown in FIG.
Hydrophilic carbon black (-O, -OH,-
(COOH groups etc. are present in a large amount and the contact angle with water is less than 90 °) and a fluororesin such as polytetrafluoroethylene (PTFE) and support a catalyst such as platinum (Pt) A reaction layer 41a, a water-repellent carbon black (which has been graphitized, hydrogen atoms are bonded to surface carbon, and has a contact angle with water of 90 ° or more), a fluororesin, and a nickel mesh or the like. Current collector 41b
The cell segment is configured by joining a porous gas diffusion layer 41c interposed therebetween, and supplies and discharges an electrolyte and a reaction gas.
An electrolytic cell 43 is sandwiched between 42a and 42b. In FIG. 8, reference numeral 44 is a counter electrode.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
ガス拡散電極では、電解槽に組み込んだ場合、外周面が
大気に露出しているので、その外周面から大気中の不純
ガス（例えばＣＯ2 、Ｃｌ2 等）がガス拡散層を経て電
解液に混入して不溶性物を生成し（特に、ＣＯ2 は不溶
性のＮａ2 ＣＯ3 を生成する。) 、電解液や電気の流れ
を阻害して電解を妨害し、あるいは耐用寿命を縮める不
具合がある。そこで、本発明は、電解を良好とし、かつ
耐用寿命を長くし得るガス拡散電極の提供を目的とす
る。However, in a conventional gas diffusion electrode, when incorporated in an electrolytic cell, the outer peripheral surface is exposed to the atmosphere, so that the impurity gas (for example, CO 2 , Cl 2 or the like is mixed into the electrolytic solution through the gas diffusion layer to generate an insoluble substance (in particular, CO 2 generates insoluble Na 2 CO 3 ), and obstructs the flow of the electrolytic solution and electricity to perform the electrolysis. Or shorten the useful life. Therefore, an object of the present invention is to provide a gas diffusion electrode that can improve electrolysis and extend the service life.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するた
め、本発明のガス拡散電極は、外周面及び／又は周辺部
にガス不透過処理を施したことを特徴とする。前記外周
面のガス不透過処理は、外周面へのフッ素樹脂膜の貼付
であることが好ましい。又、外周面のガス不透過処理
は、外周面へのシリコン、フッ素樹脂又は塩化ビニル系
の充填剤、接着剤又はグリース状のものの塗布であって
もよい。一方、前記周辺部のガス不透過処理は、周辺部
の表面へのフッ素樹脂膜の貼付であることが好ましい。
又、周辺部のガス不透過処理は、周辺部の表面へのシリ
コン、フッ素樹脂又は塩化ビニル系の充填剤、接着剤又
はグリース状のものの塗布であってもよい。更に、周辺
部のガス不透過処理は、周辺部へのシリコン又はフッ素
樹脂系のオイルの含浸であってもよい。更に又、周辺部
のガス不透過処理は、周辺部へのシリコン又はフッ素樹
脂系のオイルの含浸及び周辺部の表面へのシリコン、フ
ッ素樹脂又は塩化ビニル系の充填剤、接着剤又はグリー
ス状のものの塗布であってもよい。In order to solve the above problems, a gas diffusion electrode according to the present invention is characterized in that an outer peripheral surface and / or a peripheral portion are subjected to a gas impermeability treatment. It is preferable that the gas impermeability treatment of the outer peripheral surface is a sticking of a fluororesin film to the outer peripheral surface. Further, the gas impermeability treatment of the outer peripheral surface may be a coating of silicone, fluororesin or vinyl chloride based filler, adhesive or grease on the outer peripheral surface. On the other hand, it is preferable that the gas impermeability treatment of the peripheral portion is to attach a fluororesin film to the surface of the peripheral portion.
Further, the gas impermeability treatment of the peripheral portion may be a coating of a silicone, fluororesin or vinyl chloride-based filler, adhesive or grease on the surface of the peripheral portion. Further, the gas impermeability treatment of the peripheral part may be impregnation of silicon or fluororesin oil into the peripheral part. Furthermore, the gas impermeability treatment of the peripheral portion is performed by impregnating the peripheral portion with silicon or fluororesin-based oil and filling the peripheral surface with silicon, fluororesin or vinyl chloride-based filler, adhesive or grease. It may be a coating of a material.
【０００５】[0005]
【作用】本発明のガス拡散電極においては、外周面及び
／又は周辺部からのガスの透過が防止される。According to the gas diffusion electrode of the present invention, the permeation of gas from the outer peripheral surface and / or the peripheral portion is prevented.
【０００６】[0006]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。図１、図２は本発明のガス拡散電極の第１
実施例を示す断面図、正面図である。このガス拡散電極
１は、親水性カーボンブラックとフッ素樹脂とからな
り、かつ触媒を担持した多孔性の反応層１ａ、及び撥水
性カーボンブラックとフッ素樹脂からなり、かつ集電体
１ｂを介挿した多孔性のガス拡散層１ｃを接合した方形
板状とされると共に、周辺部の表面にフッ素樹脂膜２を
貼付して構成されている。フッ素樹脂膜２の貼付は、例
えばネオフロンフィルム（ダイキン工業）を 300〜 400
℃の温度で加熱後、５kg／cm2 以上の圧力でプレスして
行われる。上記構成のガス拡散電極１においては、周辺
部がガス不透過性となるので、電解槽に組み込んだ場
合、外周部からの大気中の不純ガスの透過を防止するこ
とができ、電解液中に不溶性物が生成することはなく、
ひいては電解を良好とすることができ、かつ耐用寿命を
長くすることができる。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first example of the gas diffusion electrode of the present invention.
It is sectional drawing and front view which show an Example. The gas diffusion electrode 1 is made of a hydrophilic carbon black and a fluororesin, and has a porous reaction layer 1a carrying a catalyst, a water-repellent carbon black and a fluororesin, and has a current collector 1b interposed. It has a rectangular plate shape in which a porous gas diffusion layer 1c is joined, and has a structure in which a fluororesin film 2 is attached to the surface of the peripheral portion. The sticking of the fluororesin film 2 may be performed, for example, using a Neoflon film (Daikin Industries)
After heating at a temperature of ° C., pressing is performed at a pressure of 5 kg / cm 2 or more. In the gas diffusion electrode 1 having the above-described structure, the peripheral portion is gas-impermeable, so that when incorporated in an electrolytic cell, the permeation of impurity gas in the atmosphere from the outer peripheral portion can be prevented, and No insoluble matter is formed,
As a result, the electrolysis can be made good and the service life can be prolonged.
【０００７】図３は本発明のガス拡散電極の第２実施例
を示す断面図である。このガス拡散電極11は、外周面に
フッ素樹脂膜21を貼付して構成されている。他の構成
は、第１実施例のものと同様であるので、同一の構成部
材には同一の符号を付してその説明を省略する。上記構
成のガス拡散電極11においては、外周面がガス不透過性
となるので、第１実施例のものと同様の作用効果が得ら
れる。FIG. 3 is a sectional view showing a second embodiment of the gas diffusion electrode of the present invention. This gas diffusion electrode 11 is configured by attaching a fluororesin film 21 to the outer peripheral surface. The other configuration is the same as that of the first embodiment, so that the same components are denoted by the same reference numerals and description thereof is omitted. In the gas diffusion electrode 11 having the above configuration, the outer peripheral surface is gas-impermeable, so that the same operation and effect as those of the first embodiment can be obtained.
【０００８】図４は本発明のガス拡散電極の第３実施例
を示す断面図である。このガス拡散電極12は、周辺部の
表面にシリコン、フッ素樹脂又は塩化ビニル系の充填
剤、接着剤又はグリース状のもの３（以下、「シリコン
系等の充填剤等」という。）を塗布して構成されてい
る。他の構成は、第１実施例のものと同様であるので、
同一の構成部材には同一の符号を付してその説明を省略
する。上記構成のガス拡散電極12においては、周辺部が
ガス不透過性となるので、第１実施例のものと同様の作
用効果が得られる。FIG. 4 is a sectional view showing a third embodiment of the gas diffusion electrode of the present invention. The gas diffusion electrode 12 is coated with a silicon, fluororesin or vinyl chloride-based filler, adhesive or grease-like material 3 (hereinafter referred to as “silicon-based filler”) on the surface of the peripheral portion. It is configured. Other configurations are the same as those of the first embodiment.
The same components are denoted by the same reference numerals, and description thereof is omitted. In the gas diffusion electrode 12 having the above configuration, the peripheral portion is gas-impermeable, so that the same operation and effect as those of the first embodiment can be obtained.
【０００９】図５は本発明のガス拡散電極の第４実施例
を示す断面図である。このガス拡散電極13は、外周面に
シリコン等の充填剤等31を塗布して構成されている。他
の構成は、第１実施例のものと同様であるので、同一の
構成部材には同一の符号を付してその説明を省略する。
上記構成のガス拡散電極13においては、外周面がガス不
透過性となるので、第１実施例のものと同様の作用効果
が得られる。FIG. 5 is a sectional view showing a fourth embodiment of the gas diffusion electrode of the present invention. The gas diffusion electrode 13 is configured by applying a filler 31 such as silicon on the outer peripheral surface. The other configuration is the same as that of the first embodiment, so that the same components are denoted by the same reference numerals and description thereof is omitted.
In the gas diffusion electrode 13 having the above configuration, the outer peripheral surface is gas-impermeable, so that the same operation and effect as those of the first embodiment can be obtained.
【００１０】図６は本発明のガス拡散電極の第５実施例
を示す断面図である。このガス拡散電極14は、外周部に
シリコン又はフッ素樹脂系のオイル４を含浸して（例え
ばフッ素樹脂系オイルの場合、含浸１時間、粘度40℃で
30〜440cst)構成されている。他の構成は、第１実施例
のものと同様であるので、同一の構成部材には同一の符
号を付してその説明を省略する。上記構成のガス拡散電
極14においては、外周面がガス不透過性となるので、第
１実施例のものと同様の作用効果が得られる。FIG. 6 is a sectional view showing a fifth embodiment of the gas diffusion electrode of the present invention. The outer periphery of the gas diffusion electrode 14 is impregnated with silicon or fluororesin-based oil 4 (for example, in the case of fluororesin-based oil, impregnation is performed for 1 hour at a viscosity of 40 ° C.).
30 to 440cst). The other configuration is the same as that of the first embodiment, so that the same components are denoted by the same reference numerals and description thereof is omitted. In the gas diffusion electrode 14 having the above configuration, the outer peripheral surface is gas-impermeable, so that the same operation and effect as those of the first embodiment can be obtained.
【００１１】図７は本発明のガス拡散電極の第６実施例
を示す断面図である。このガス拡散電極15は、外周部に
シリコン又はフッ素樹脂系のオイル４を含浸すると共
に、外周面にシリコン系等の充填剤等31を塗布して構成
されている。他の構成は、第１実施例のものと同様であ
るので、同一の構成部材には同一の符号を付してその説
明を省略する。上記構成のガス拡散電極15においては、
周辺部及び外周面がガス不透過性となるので、第１実施
例のものより一層優れた作用効果が得られる。FIG. 7 is a sectional view showing a sixth embodiment of the gas diffusion electrode of the present invention. The gas diffusion electrode 15 is configured by impregnating the outer periphery with silicon or fluororesin-based oil 4 and applying a silicone-based filler 31 or the like to the outer periphery. The other configuration is the same as that of the first embodiment, so that the same components are denoted by the same reference numerals and description thereof is omitted. In the gas diffusion electrode 15 having the above configuration,
Since the peripheral portion and the outer peripheral surface are gas-impermeable, more excellent operational effects can be obtained than in the first embodiment.
【００１２】ここで、上記各実施例のガス拡散電極１、
11、12、13、14、15のガス不透過処理を施した外周面及
び／又は周辺部のガス透過性をみるために、それらの部
分に0.5kg／cm2 及び 2.0kg／cm2 のガス圧をかけたと
ころ、従来のものは、3.77cm4/sec.kgf 及び14.52cm4/s
ec.kgfガス透過率を示したのに対し、いずれもガスの透
過が全くなかった。Here, the gas diffusion electrode 1 of each of the above embodiments,
In order to check the gas permeability of the outer peripheral surface and / or the peripheral part which has been subjected to the gas impermeability treatment of 11, 12, 13, 14, and 15, a gas of 0.5 kg / cm 2 and 2.0 kg / cm 2 When pressure was applied, the conventional one was 3.77 cm 4 /sec.kgf and 14.52 cm 4 / s
Although ec.kgf gas permeability was shown, there was no gas permeation at all.
【００１３】[0013]
【発明の効果】以上説明したように、本発明のガス拡散
電極によれば、外周面及び／又は周辺部がガス不透過性
となってガスの透過が防止されるので、電解槽に組み込
んだ場合、従来のように外周面及び／又は周辺部から大
気中の不純ガスが透過するのを防止することができ、電
解液中に不溶性物が生成することなく、ひいては電解を
良好とすることができ、かつ耐用寿命を長くすることが
できる。As described above, according to the gas diffusion electrode of the present invention, since the outer peripheral surface and / or the peripheral portion become gas impermeable and gas transmission is prevented, the gas diffusion electrode is incorporated in the electrolytic cell. In such a case, it is possible to prevent the impurity gas in the atmosphere from permeating from the outer peripheral surface and / or the peripheral portion as in the conventional case, and it is possible to prevent insoluble matter from being generated in the electrolytic solution and thereby improve the electrolysis. And the service life can be extended.
【図１】本発明のガス拡散電極の第１実施例を示す断面
図である。FIG. 1 is a sectional view showing a first embodiment of a gas diffusion electrode of the present invention.
【図２】図１のガス拡散電極の平面図である。FIG. 2 is a plan view of the gas diffusion electrode of FIG.
【図３】本発明のガス拡散電極の第２実施例を示す断面
図である。FIG. 3 is a sectional view showing a second embodiment of the gas diffusion electrode of the present invention.
【図４】本発明のガス拡散電極の第３実施例を示す断面
図である。FIG. 4 is a sectional view showing a third embodiment of the gas diffusion electrode of the present invention.
【図５】本発明のガス拡散電極の第４実施例を示す断面
図である。FIG. 5 is a sectional view showing a fourth embodiment of the gas diffusion electrode of the present invention.
【図６】本発明のガス拡散電極の第５実施例を示す断面
図である。FIG. 6 is a sectional view showing a fifth embodiment of the gas diffusion electrode of the present invention.
【図７】本発明のガス拡散電極の第６実施例を示す断面
図である。FIG. 7 is a sectional view showing a sixth embodiment of the gas diffusion electrode of the present invention.
【図８】従来のガス拡散電極を備えた電解槽の断面図で
ある。FIG. 8 is a sectional view of an electrolytic cell provided with a conventional gas diffusion electrode.
１ ガス拡散電極 ２ フッ素樹脂膜 ３ 充填剤等 ４ オイル 11 ガス拡散電極 12 ガス拡散電極 13 ガス拡散電極 14 ガス拡散電極 15 ガス拡散電極 21 フッ素樹脂膜 31 充填剤等 DESCRIPTION OF SYMBOLS 1 Gas diffusion electrode 2 Fluororesin film 3 Filler etc. 4 Oil 11 Gas diffusion electrode 12 Gas diffusion electrode 13 Gas diffusion electrode 14 Gas diffusion electrode 15 Gas diffusion electrode 21 Fluororesin film 31 Filler etc.
フロントページの続き (56)参考文献 特開 昭61−130497（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C25B 1/00 - 15/08 C25D 17/12 (56) References JP-A-61-130497 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C25B 1/00-15/08 C25D 17/12
Claims (7)
理を施したことを特徴とするガス拡散電極。1. A gas diffusion electrode, wherein a gas impermeability treatment is applied to an outer peripheral surface and / or a peripheral portion.
へのフッ素樹脂膜の貼付であることを特徴とする請求項
１記載のガス拡散電極。2. The gas diffusion electrode according to claim 1, wherein the gas impermeability treatment on the outer peripheral surface is a step of attaching a fluororesin film to the outer peripheral surface.
へのシリコン、フッ素樹脂又は塩化ビニル系の充填剤、
接着剤又はグリース状のものの塗布であることを特徴と
する請求項１記載のガス拡散電極。3. The gas-impermeable treatment of the outer peripheral surface is performed by filling the outer peripheral surface with a silicon, fluororesin or vinyl chloride-based filler,
2. The gas diffusion electrode according to claim 1, wherein the gas diffusion electrode is an application of an adhesive or a grease.
の表面へのフッ素樹脂膜の貼付であることを特徴とする
請求項１記載のガス拡散電極。4. The gas diffusion electrode according to claim 1, wherein the gas impermeable treatment of the peripheral portion is a process of attaching a fluororesin film to a surface of the peripheral portion.
の表面へのシリコン、フッ素樹脂又は塩化ビニル系の充
填剤、接着剤又はグリース状のものの塗布であることを
特徴とする請求項１記載のガス拡散電極。5. The gas-impermeable treatment of the peripheral portion is a coating of a filler, an adhesive or a grease-like material of silicon, fluororesin or vinyl chloride to the surface of the peripheral portion. 2. The gas diffusion electrode according to 1.
へのシリコン又はフッ素樹脂系のオイルの含浸であるこ
とを特徴とする請求項１記載のガス拡散電極。6. The gas diffusion electrode according to claim 1, wherein the gas impermeability treatment of the peripheral portion is a step of impregnating the peripheral portion with silicon or a fluororesin-based oil.
へのシリコン又はフッ素樹脂系のオイルの含浸及び周辺
部の表面へのシリコン、フッ素樹脂又は塩化ビニル系の
充填剤、接着剤又はグリース状のものの塗布であること
を特徴とする請求項１記載のガス拡散電極。7. The gas impermeability treatment of the peripheral portion is performed by impregnating the peripheral portion with silicon or fluororesin-based oil and filling the peripheral surface with silicon, fluororesin or vinyl chloride-based filler, adhesive or 2. The gas diffusion electrode according to claim 1, wherein the gas diffusion electrode is applied by grease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11437094A JP3313238B2 (en) | 1994-04-28 | 1994-04-28 | Gas diffusion electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11437094A JP3313238B2 (en) | 1994-04-28 | 1994-04-28 | Gas diffusion electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07300690A JPH07300690A (en) | 1995-11-14 |
| JP3313238B2 true JP3313238B2 (en) | 2002-08-12 |
Family
ID=14636012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11437094A Expired - Fee Related JP3313238B2 (en) | 1994-04-28 | 1994-04-28 | Gas diffusion electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3313238B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148468C (en) * | 1999-02-16 | 2004-05-05 | 古屋长一 | Gaseous diffusion electrode assembly and production method thereof |
-
1994
- 1994-04-28 JP JP11437094A patent/JP3313238B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07300690A (en) | 1995-11-14 |
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