JPH07220728A - Bubble capturing gas electrode - Google Patents
Bubble capturing gas electrodeInfo
- Publication number
- JPH07220728A JPH07220728A JP6034094A JP3409494A JPH07220728A JP H07220728 A JPH07220728 A JP H07220728A JP 6034094 A JP6034094 A JP 6034094A JP 3409494 A JP3409494 A JP 3409494A JP H07220728 A JPH07220728 A JP H07220728A
- Authority
- JP
- Japan
- Prior art keywords
- bubble
- collecting
- gas
- holding member
- electrode
- 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
Landscapes
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Inert Electrodes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電解液に浸漬され、そ
の中に混合された気泡を捕集して反応ガスとする気泡捕
集型ガス電極に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bubble collecting type gas electrode which is immersed in an electrolytic solution and collects bubbles mixed therein to obtain a reaction gas.
【０００２】[0002]
【従来の技術】従来、この種の気泡捕集型ガス電極は、
親水性カーボンブラックとＰＴＦＥ（ポリテトラフルオ
ロエチレン）等のフッ素樹脂からなり、白金等の触媒が
含浸された反応層と、撥水性のカーボンブラックとＰＴ
ＦＥからなり、集電網が介在されたガス供給層とを接合
して構成され、電解液中に混合された気泡を撥水性のガ
ス供給層の表面で捕集して反応ガスとするものであり、
水素−酸素燃料電池等の電極として使用されている。2. Description of the Related Art Conventionally, this type of bubble collecting type gas electrode is
A reaction layer made of hydrophilic carbon black and fluororesin such as PTFE (polytetrafluoroethylene), impregnated with a catalyst such as platinum, water-repellent carbon black and PT
It is composed of FE and is joined to a gas supply layer with a current collecting network interposed, and collects bubbles mixed in the electrolytic solution on the surface of the water-repellent gas supply layer to form a reaction gas. ,
It is used as an electrode in hydrogen-oxygen fuel cells.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
気泡捕集型ガス電極では、気泡を捕集するためにガス供
給層を撥水性にしただけであるので、気泡の捕集効率が
悪く、かつ捕集したガスの保持量が少なく、高電流密度
で動作させることができない不具合がある。 そこで、
本発明は、気泡の捕集を容易とし、かつガスの保持量を
多くすることにより、高電流密度で動作させ得る気泡捕
集型ガス電極の提供を目的とする。However, in the conventional bubble collecting type gas electrode, since the gas supply layer is made water repellent in order to collect the bubbles, the bubble collecting efficiency is poor, and There is a problem that the amount of collected gas is small and it cannot be operated at high current density. Therefore,
An object of the present invention is to provide a bubble collecting type gas electrode which can be operated at a high current density by facilitating collection of bubbles and increasing the amount of gas retained.
【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、本発明の気泡捕集型ガス電極は、電解液中に混合さ
れた気泡を捕集して反応ガスとする気泡捕集型ガス電極
において、ガス供給層の表面に接合されるベースプレー
ト部と、ベースプレート部に設けられた多数の開口部
と、各開口部を覆うようにしてベースプレート部に突設
され、下部が開放されたフード部とからなる気泡捕集保
持部材を備えることを特徴とする。なお、開口部は千鳥
状に設けると気泡捕集効率が良くなり、好ましい。前記
気泡捕集保持部材は、水平方向で隣り合うフード部同士
を接続する接続部を有していることが好ましい。又、前
記気泡捕集保持部材は、金属製であることが好ましい。
更に、前記気泡捕集保持部材は、合成樹脂製であっても
よい。In order to solve the above-mentioned problems, a bubble-collecting gas electrode of the present invention is a bubble-collecting gas electrode for collecting bubbles mixed in an electrolytic solution to form a reaction gas. In, the base plate portion to be joined to the surface of the gas supply layer, a large number of openings provided in the base plate portion, a hood portion protruding from the base plate portion so as to cover each opening, the lower portion is opened. It is characterized by comprising a bubble collecting and holding member consisting of. It is preferable to provide the openings in a zigzag pattern because the efficiency of collecting bubbles is improved. It is preferable that the bubble collecting and holding member has a connecting portion that connects the hood portions that are adjacent to each other in the horizontal direction. Further, it is preferable that the bubble collecting and holding member is made of metal.
Further, the bubble collecting and holding member may be made of synthetic resin.
【０００５】[0005]
【作用】本発明の気泡捕集型ガス電極においては、気泡
が各フード部によって容易に捕集され、かつガスがそれ
ぞれのフード部内に多量に保持される。フード部同士を
接続する接続部を有していることにより、水平方向で隣
り合うフード部間でガスの分配が可能となる。又、前記
気泡捕集保持部材が金属製であることにより、集電抵抗
が小さくなる。更に、前記気泡捕集保持部材が合成樹脂
製であることにより、耐食性が高められる。一方、気泡
捕集保持部材は、撥水性であることが望ましいが、ガス
の移動を抑えるために部分的に親水性にすると良い。In the bubble-collecting type gas electrode of the present invention, bubbles are easily collected by each hood portion, and a large amount of gas is retained in each hood portion. By having the connecting portion that connects the hood portions to each other, it becomes possible to distribute the gas between the hood portions that are horizontally adjacent to each other. Further, since the bubble collecting and holding member is made of metal, the current collecting resistance is reduced. Further, since the bubble collecting and holding member is made of synthetic resin, the corrosion resistance is enhanced. On the other hand, the air bubble collecting and holding member is preferably water repellent, but it is preferable that the air bubble collecting and holding member be made partially hydrophilic in order to suppress gas movement.
【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及び図３は本発明の気泡捕集型
ガス電極の一実施例を示す正面図、縦断面図及び横断面
図である。なお、以下で用いる親水性カーボンブラック
は表面に−ＣＯＯＨ等の水と親和性のある活性基を持つ
もので、水に分散する性質を有し、撥水性カーボンブラ
ックはグラファイト化が進行しており、水と親和性のあ
る活性基を持たず、そのままでは水に分散しないものを
使用した。この気泡捕集型ガス電極１は、親水性カーボ
ンブラックとＰＴＦＥからなり、白金等の触媒が含浸さ
れた反応層２と、撥水性カーボンブラックとＰＴＦＥか
らなり、ニッケル集電網３が介在され、かつ上記反応層
２に接合されたガス供給層４と、このガス供給層４の表
面に接合された気泡捕集保持部材５とから構成されてい
る。気泡捕集保持部材５は、電解液中に混合された気泡
を捕集しかつガスを保持し、ガス供給層４に反応ガスと
して供給するためのもので、ベースプレート部６と、ベ
ースプレート部６に千鳥状に設けられた矩形状の多数の
開口部７と、各開口部７を個別に覆うようにしてベース
プレート部６に一体に突設され、下部が開放された三角
屋根型のフード部８と、水平方向（図１においては左右
方向）で隣り合うフード部８同士を接続する接続部９と
からなり、ステンレス鋼板を板金加工することによって
作製されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1, FIG. 2 and FIG. 3 are a front view, a longitudinal sectional view and a transverse sectional view showing an embodiment of the bubble collecting type gas electrode of the present invention. The hydrophilic carbon black used below has an active group having an affinity for water such as —COOH on the surface and has a property of being dispersed in water. The water-repellent carbon black has been graphitized. , Which has no active group having an affinity for water and which does not disperse in water as it is was used. This gas collecting type gas electrode 1 comprises a hydrophilic carbon black and PTFE, a reaction layer 2 impregnated with a catalyst such as platinum, a water repellent carbon black and PTFE, and a nickel current collecting network 3 interposed therebetween. The gas supply layer 4 is joined to the reaction layer 2 and the bubble collecting / holding member 5 is joined to the surface of the gas supply layer 4. The bubble collecting / holding member 5 is for collecting the bubbles mixed in the electrolytic solution, holding the gas, and supplying the gas to the gas supply layer 4 as a reaction gas. A large number of rectangular openings 7 provided in a staggered manner, and a triangular roof-type hood portion 8 which is integrally projected from the base plate portion 6 so as to individually cover the openings 7 and whose lower portion is open. , And a connecting portion 9 that connects the hood portions 8 adjacent to each other in the horizontal direction (the horizontal direction in FIG. 1), and is manufactured by sheet metal working of a stainless steel plate.
【０００７】上記構成の気泡捕集型ガス電極１は、フー
ド部８が下向きに開放されるようにして電解液中に垂直
に浸漬して使用され、電解液中に混合された気泡が、各
フード部８によって捕集され、その中に保持されたガス
が開口部７よりガス供給層４に供給されるものである。
ここで、上記気泡捕集型ガス電極１を、図４に示すよう
に、20％ＫＯＨを電解液10として収容した電解槽11内に
隔膜12を挾んで対向配置し、電解槽11内の電解液10中に
水素と酸素の気泡13、14をそれぞれバブリングして水酸
−酸素燃料電池を構成した。電極性能は、従来の電極が
電池電圧 0.6Ｖで電流密度0.16Ａ/cm2であるのに対し、
電流電圧 0.6Ｖで電流密度 0.5Ａ/cm2以上となり、約３
倍以上となった。The bubble-collecting gas electrode 1 having the above-mentioned structure is used by vertically immersing it in the electrolytic solution so that the hood portion 8 is opened downward, and the bubbles mixed in the electrolytic solution are The gas collected by the hood portion 8 and held therein is supplied to the gas supply layer 4 through the opening 7.
Here, as shown in FIG. 4, the gas collecting type gas electrode 1 is arranged so as to be opposed to the electrolytic cell 11 containing 20% KOH as the electrolytic solution 10 with the diaphragm 12 interposed therebetween. Bubbles 13 and 14 of hydrogen and oxygen were bubbled in the liquid 10 to form a hydroxide-oxygen fuel cell. Regarding the electrode performance, the conventional electrode has a battery voltage of 0.6 V and a current density of 0.16 A / cm 2 , whereas
At a current voltage of 0.6 V, the current density becomes 0.5 A / cm 2 or more, and about 3
More than doubled.
【０００８】一方、テフロン（商品名）板を加工して前
述した気泡捕集保持部材５と同様な形状の気泡捕集保持
部材を形成し、これをガス供給層４の表面に超音波溶接
により接合して気泡捕集型ガス電極を作製した。この気
泡捕集型ガス電極を用いて図４と同様の20％ＫＯＨ水素
−酸素燃料電池を構成してみたところ、電池性能は、電
池電圧 0.6Ｖで電流密度0.46Ａ/cm2以上となり、従来の
ものの約 2.9倍以上となった。On the other hand, a Teflon (trade name) plate is processed to form a bubble collecting / holding member having the same shape as the above-mentioned bubble collecting / holding member 5, which is ultrasonically welded to the surface of the gas supply layer 4. Bonding was performed to produce a bubble collecting type gas electrode. When a 20% KOH hydrogen-oxygen fuel cell similar to that shown in FIG. 4 was constructed using this bubble collecting type gas electrode, the cell performance was 0.46 A / cm 2 or more at a cell voltage of 0.6 V, which is the conventional value. It was about 2.9 times more than that of
【０００９】[0009]
【発明の効果】以上説明したように、本発明の気泡捕集
型ガス電極によれば、気泡が各フード部によって容易に
捕集され、かつガスがそれぞれのフード部内に多量に保
持されるので、従来のに比して高電流密度で動作させる
ことができる。又、フード部同士を接続する接続部を有
していることにより、水平方向で隣り合うフード部間で
ガスの分配が可能となるので、各フード部内のガス量を
均一にすることができ、ひいては電極全面を有効に利用
することができる。更に、気泡捕集保持部材を金属製と
することにより、集電抵抗が小さくなるので、エネルギ
ー損失を小さくすることができる。更に又、気泡捕集保
持部材を合成樹脂製とすることにより、耐食性が高めら
れるので、電極寿命を長くすることができる。As described above, according to the bubble collecting type gas electrode of the present invention, bubbles are easily collected by each hood portion and a large amount of gas is retained in each hood portion. It is possible to operate at a higher current density than the conventional one. Further, by having a connecting portion that connects the hood portions to each other, it is possible to distribute gas between the hood portions that are adjacent in the horizontal direction, so that the amount of gas in each hood portion can be made uniform, As a result, the entire surface of the electrode can be effectively used. Further, since the air bubble collecting and holding member is made of metal, the current collecting resistance is reduced, so that the energy loss can be reduced. Furthermore, since the bubble collecting / holding member is made of synthetic resin, the corrosion resistance is enhanced, so that the life of the electrode can be extended.
【図１】本発明の気泡捕集型ガス電極の一実施例を示す
正面図である。FIG. 1 is a front view showing an embodiment of a bubble collecting type gas electrode of the present invention.
【図２】図１におけるII−II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】図１における III− III線断面図である。3 is a sectional view taken along line III-III in FIG.
【図４】図１の気泡捕集型ガス電極を用いた水素−酸素
燃料電池の縦断面図である。FIG. 4 is a vertical cross-sectional view of a hydrogen-oxygen fuel cell using the bubble collecting gas electrode of FIG.
２ 反応層 ３ ニッケル集電網 ４ ガス供給層 ５ 気泡捕集保持部材 ６ ベースプレート部 ７ 開口部 ８ フード部 ９ 接続部 2 Reaction Layer 3 Nickel Current Collection Network 4 Gas Supply Layer 5 Bubble Collection and Holding Member 6 Base Plate Section 7 Opening Section 8 Hood Section 9 Connection Section
Claims (5)
応ガスとする気泡捕集型ガス電極において、ガス供給層
の表面に接合されるベースプレート部と、ベースプレー
ト部に設けられた多数の開口部と、各開口部を覆うよう
にしてベースプレート部に突設され、下部が開放された
フード部とからなる気泡捕集保持部材を備えることを特
徴とする気泡捕集型ガス電極。1. A bubble collecting type gas electrode which collects bubbles mixed in an electrolytic solution and uses them as a reaction gas, and a base plate part joined to the surface of a gas supply layer, and a large number provided on the base plate part. And a bubble collecting and holding member which is provided with a hood portion which is provided on the base plate portion so as to cover each opening portion and which is open at the bottom, and a bubble collecting and holding gas electrode.
とを特徴とする請求項１記載の気泡捕集型ガス電極。2. The bubble-collecting gas electrode according to claim 1, wherein the openings are provided in a staggered pattern.
り合うフード部同士を接続する接続部を有していること
を特徴とする請求項１又は請求項２記載の気泡捕集型ガ
ス電極。3. The bubble collecting type gas according to claim 1 or 2, wherein the bubble collecting and holding member has a connecting portion that connects the hood portions that are adjacent to each other in the horizontal direction. electrode.
とを特徴とする請求項１、２又は３記載の気泡捕集型ガ
ス電極。4. The bubble-collecting gas electrode according to claim 1, 2 or 3, wherein the bubble-collecting and holding member is made of metal.
ることを特徴とする請求項１、２又は３記載の気泡捕集
型ガス電極。5. The bubble collecting type gas electrode according to claim 1, wherein the bubble collecting and holding member is made of synthetic resin.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6034094A JPH07220728A (en) | 1994-02-07 | 1994-02-07 | Bubble capturing gas electrode |
| US08/312,329 US5538608A (en) | 1993-09-25 | 1994-09-26 | Bubble collection type gas electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6034094A JPH07220728A (en) | 1994-02-07 | 1994-02-07 | Bubble capturing gas electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07220728A true JPH07220728A (en) | 1995-08-18 |
Family
ID=12404693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6034094A Pending JPH07220728A (en) | 1993-09-25 | 1994-02-07 | Bubble capturing gas electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07220728A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997047787A1 (en) * | 1996-06-07 | 1997-12-18 | Bayer Aktiengesellschaft | Electrochemical half-cell with pressure compensation |
-
1994
- 1994-02-07 JP JP6034094A patent/JPH07220728A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997047787A1 (en) * | 1996-06-07 | 1997-12-18 | Bayer Aktiengesellschaft | Electrochemical half-cell with pressure compensation |
| AU712543B2 (en) * | 1996-06-07 | 1999-11-11 | Bayer Aktiengesellschaft | Electrochemical half-cell with pressure compensation |
| US6165332A (en) * | 1996-06-07 | 2000-12-26 | Bayer Aktiengesellschaft | Electrochemical half-cell with pressure compensation |
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