JP3041791B1 - Manufacturing method of gas diffusion electrode - Google Patents
Manufacturing method of gas diffusion electrodeInfo
- Publication number
- JP3041791B1 JP3041791B1 JP11093098A JP9309899A JP3041791B1 JP 3041791 B1 JP3041791 B1 JP 3041791B1 JP 11093098 A JP11093098 A JP 11093098A JP 9309899 A JP9309899 A JP 9309899A JP 3041791 B1 JP3041791 B1 JP 3041791B1
- Authority
- JP
- Japan
- Prior art keywords
- gas diffusion
- diffusion electrode
- reaction layer
- pressure
- jig
- 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
- 238000009792 diffusion process Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 239000011888 foil Substances 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 15
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 15
- 229910052709 silver Inorganic materials 0.000 claims description 15
- 239000004332 silver Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 8
- 239000010419 fine particle Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 14
- 239000010935 stainless steel Substances 0.000 abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 12
- 229910052759 nickel Inorganic materials 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 29
- 239000003054 catalyst Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229920000544 Gore-Tex Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 235000001630 Pyrus pyrifolia var culta Nutrition 0.000 description 1
- 240000002609 Pyrus pyrifolia var. culta Species 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
【要約】
【課題】 従来のホットプレス手段により、強度、導電
性及び電極性能の改善したガス拡散電極を提供する。
【解決手段】 ガス拡散電極の反応層材料１をプレスジ
グ２でホットプレスする際に、凸部５と凹部６を有する
凹凸プレスジグ２を使用して反応層に高圧プレス部３と
低圧プレス部４を形成する。このとき、プレスジグ２と
して平滑プレスジグを使用してメッシュ状ニッケルラス
材を凸部５と凹部６に代替してもよい。また、ホットプ
レスを行う際に、硬質金属箔７であるステンレス箔を反
応層材料１とプレスジグ２の間に間挿することにより圧
力分布を制御し、多様な圧力分布を反応層に形成するこ
とが好ましい。A gas diffusion electrode having improved strength, conductivity, and electrode performance by a conventional hot pressing means is provided. SOLUTION: When hot-pressing a reaction layer material 1 of a gas diffusion electrode with a press jig 2, a high-pressure press section 3 and a low-pressure press section 4 are formed on the reaction layer by using an uneven press jig 2 having a convex portion 5 and a concave portion 6. Form. At this time, a mesh-like nickel lath material may be substituted for the convex portion 5 and the concave portion 6 by using a smooth press jig as the press jig 2. In addition, when hot pressing is performed, a stainless steel foil, which is a hard metal foil 7, is inserted between the reaction layer material 1 and the press jig 2 to control the pressure distribution to form various pressure distributions in the reaction layer. Is preferred.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、銀とポリテトラフ
ルオロエチレン（ＰＴＦＥ）から成る反応層を有するガ
ス拡散電極の製造方法に関する。さらに詳しくは、本発
明は、食塩電解等に使用される耐久性、強度、導電性及
び電極性能の優れたガス拡散電極の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a gas diffusion electrode having a reaction layer composed of silver and polytetrafluoroethylene (PTFE). More specifically, the present invention relates to a method for producing a gas diffusion electrode having excellent durability, strength, conductivity, and electrode performance used for salt electrolysis and the like.
【０００２】[0002]
【従来の技術】従来から、銀微粒子とＰＴＦＥから成る
反応層を有するガス拡散電極は、アルカリ電解液中では
銀とＰＴＦＥの腐食がほとんど無いので、酸素還元電極
として長寿命が期待されている。そして、銀微粒子とＰ
ＴＦＥディスパージョンを混合濾過してフッ素樹脂を含
む触媒シートを作り、その片面に多孔性フッ素樹脂膜等
のガス供給層を加圧密着してガス拡散電極が製造されて
いた。2. Description of the Related Art Conventionally, a gas diffusion electrode having a reaction layer composed of silver fine particles and PTFE has been expected to have a long life as an oxygen reduction electrode because there is almost no corrosion of silver and PTFE in an alkaline electrolyte. And silver fine particles and P
The TFE dispersion was mixed and filtered to form a catalyst sheet containing a fluororesin, and a gas supply layer such as a porous fluororesin film was pressed and adhered to one surface of the catalyst sheet to produce a gas diffusion electrode.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、この銀
とＰＴＦＥのみから成る反応層を有するガス拡散電極
は、ＰＴＦＥの融点３２７℃以上の温度、１０ｋｇ／ｃ
ｍ2 の圧力でホットプレスすると、ＰＴＦＥの溶融流動
化、銀のシンターのために触媒面積の減少とガス供給能
の減少により、実用的な電極性能が得られないという問
題点があった。そのため、２５０℃程度の低温、５ｋｇ
／ｃｍ2 程度の低圧でホットプレスしていた。しかし、
このような低温、低圧でのプレスでは、電極強度及び反
応層とガス供給層との剥離強度が著しく小さくなる。こ
のため、初期性能は優れているが取扱いに注意を要する
し、また耐久性が無い等の問題点があり、このタイプの
電極は実用化が困難であるという欠点があった。However, this gas diffusion electrode having a reaction layer consisting only of silver and PTFE has a temperature higher than the melting point of 327 ° C. of PTFE and 10 kg / c.
When hot pressing is performed at a pressure of m 2 , there is a problem that practical electrode performance cannot be obtained due to a decrease in the catalyst area and a decrease in gas supply capability due to melt fluidization of PTFE and silver sintering. Therefore, low temperature of about 250 ° C, 5kg
/ Cm 2 was hot pressed at a low pressure. But,
In such a low-temperature, low-pressure press, the electrode strength and the peel strength between the reaction layer and the gas supply layer are significantly reduced. For this reason, the initial performance is excellent, but care must be taken in handling, and there are problems such as lack of durability. This type of electrode has the drawback that practical use is difficult.
【０００４】それゆえ、この欠点を改良する特許が出願
されている。例えば、剥離防止のためガス拡散層と触媒
層の間に密着強度維持層を設けるために、接着前にＰＴ
ＦＥディスパージョンを触媒シートに塗布乾燥し、その
量が３〜７ｍｇ／ｃｍ2 であり、２８０〜３５０℃で熱
処理する方法（特開昭６１−１１１０１７号公報）。集
電体に触媒・フッ素樹脂ペーストを塗布し、ガス供給層
側に低融点フッ素樹脂分散物を塗布し、その上にガス透
過撥水性フイルムを張り付け、融点の中間温度で熱処理
する方法（特開昭６２−２２６５７２号公報）等であ
る。Therefore, patents have been filed to remedy this drawback. For example, in order to provide an adhesion strength maintaining layer between the gas diffusion layer and the catalyst layer in order to prevent peeling, PT
A method in which the FE dispersion is applied to a catalyst sheet and dried, and the amount thereof is 3 to 7 mg / cm 2 , and heat treatment is performed at 280 to 350 ° C. (Japanese Patent Application Laid-Open No. 61-111017). A method in which a catalyst / fluororesin paste is applied to a current collector, a low-melting fluororesin dispersion is applied to the gas supply layer side, a gas-permeable water-repellent film is adhered thereon, and a heat treatment is performed at an intermediate temperature of the melting point (Japanese Patent Laid-Open No. 62-226572).
【０００５】しかしながら、依然として、これらの特許
の改良によっても十分な剥離強度は得られないのが現状
である。十分な強度を得るためには、ＰＴＦＥの融点以
上で１０ｋｇ／ｃｍ2 以上のプレス条件が必要である
が、この条件では銀がシンターして十分な性能が得られ
ず、強度と性能の両立が困難であるのが現状であった。
本発明は、このような従来の課題に鑑みてなされたもの
であり、ガス拡散電極の反応層のホットプレスする際
に、強度、導電性及び電極性能がともに改善されるガス
拡散電極の製造方法を提供することを目的とする。However, at present, sufficient peel strength cannot be obtained even by the improvement of these patents. In order to obtain sufficient strength, pressing conditions of 10 kg / cm 2 or more at a temperature higher than the melting point of PTFE are required. However, under these conditions, sufficient performance cannot be obtained due to sintering of silver, and both the strength and performance are compatible. It was difficult at present.
The present invention has been made in view of such conventional problems, and when hot-pressing a reaction layer of a gas diffusion electrode, a method for manufacturing a gas diffusion electrode in which both strength, conductivity and electrode performance are improved. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明者は、前記課題を
解決すべく鋭意研究を行い、以下の事象を見出した。従
来のプレスジグは平滑であったが、このシグに０．５ｍ
ｍ程度の凹凸を付け、個所によってプレス圧が変わって
いるようにし、ＰＴＦＥの融点以上でプレスした。その
結果、凸部では高圧でプレスされ、凹部では低圧とな
る。そのため、凸部でプレスされた部分は強度と導電性
が向上するが、電極性能は低下する。しかし、凹部でプ
レスされた電極部分は１０ｋｇ／ｃｍ2 以下の低圧で最
適な圧力にすることが可能なので、電極性能を引き出す
ことが出来る。また、プレスジグとの間にステンレス箔
等を挟みプレスすると金属箔の強度と変形のためにガス
拡散電極に圧力分布を与えることが出来る。分布は箔の
厚さで制御できる。そして、本発明者は、上記の知見に
基づいて本発明を完成するに到ったのである。Means for Solving the Problems The present inventor has conducted intensive studies to solve the above-mentioned problems, and found the following phenomena. The conventional press jig was smooth, but this
The sheet was pressed at a temperature equal to or higher than the melting point of PTFE, with irregularities of about m provided so that the pressing pressure varied depending on the location. As a result, the projection is pressed at a high pressure and the depression is at a low pressure. Therefore, the strength and conductivity of the portion pressed by the convex portion are improved, but the electrode performance is reduced. However, the electrode portion pressed in the recess can be adjusted to an optimum pressure at a low pressure of 10 kg / cm 2 or less, so that the electrode performance can be brought out. When a stainless steel foil or the like is sandwiched between the press jig and the press, a pressure distribution can be given to the gas diffusion electrode due to the strength and deformation of the metal foil. The distribution can be controlled by the thickness of the foil. Then, the present inventors have completed the present invention based on the above findings.
【０００７】すなわち、本発明は、次の構成により前記
の課題を解決した。 （１）主として銀微粒子とポリテトラフルオロエチレン
から成る反応層を有するガス拡散電極のホットプレス時
に、連続的な凹凸を有するプレスジグを用いて不均一な
圧力分布とし、かつポリテトラフルオロエチレンの隔点
以上の温度でホットプレスすることを特徴とするガス拡
散電極の製造方法。 （２）前記ガス拡散電極の反応層のホットプレス時に、
前記連続的な凹凸を有するプレスジグとプレスされるガ
ス拡散電極の反応層の間に硬質金属箔を挟むことにより
圧力分布を制御することを特徴とする前記（１）記載の
ガス拡散電極の製造方法。 （３）前記（１）又は（２）記載のガス拡散電極の製造
方法において、連続的な凹凸を有するプレスジグに代え
て平滑なジグと金属ラス材、金属網等の網状体の組合せ
を用いることを特徴とするガス拡散電極の製造方法。That is, the present invention has solved the above-mentioned problems by the following constitution. (1) During hot pressing of a gas diffusion electrode having a reaction layer mainly composed of silver fine particles and polytetrafluoroethylene, a non-uniform pressure distribution is obtained by using a press jig having continuous irregularities, and a separation point of polytetrafluoroethylene. A method for producing a gas diffusion electrode, comprising hot-pressing at the above temperature. (2) When hot pressing the reaction layer of the gas diffusion electrode,
The method for producing a gas diffusion electrode according to (1), wherein a pressure distribution is controlled by sandwiching a hard metal foil between the press jig having the continuous unevenness and a reaction layer of the gas diffusion electrode to be pressed. . (3) In the method for producing a gas diffusion electrode according to the above (1) or (2), a combination of a smooth jig and a mesh member such as a metal lath material and a metal net is used instead of the press jig having continuous irregularities. A method for producing a gas diffusion electrode, comprising:
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。ただし、本発明は、これらの実施
態様のみに限定されるものではない。なお、実施の形態
を通じて、部は全て重量部を意味する。なお、本発明で
用いる銀微粒子の材質は純粋な銀である必要はなく、さ
らに銀合金である場合をも含むものである。Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to only these embodiments. Throughout the embodiments, all parts mean parts by weight. The material of the silver fine particles used in the present invention does not need to be pure silver, and may include a silver alloy.
【０００９】図１は、ガス拡散電極の反応層材料１をプ
レスジグ２でホットプレスする際の高圧プレス部３と低
圧プレス部４の位置関係を示す断面説明図である。５は
反応層に高圧プレス部３を形成するための凸部であり、
６は反応層に低圧プレス部を形成するためのプレスジグ
２の凹部である。プレスジグ２は、必ずしもこのように
凸部５及び凹部６を設けた凹凸プレスジグに作製する必
要はなく、プレスジグ２として平滑（平面）プレスジグ
を使用し、凸部５の代替としてメッシュ状ニッケルラス
材を使用しても凹凸プレスジグと同様の不均一な圧力分
布効果が得られる。この場合には従来のプレスジグをそ
のまま使用することができ、特別のプレスジグを作る必
要がない。前記ニッケルラス材はその材質がニッケル以
外の金属でもよく、またラス材の形態は一般の網状体で
あってもよい。FIG. 1 is an explanatory sectional view showing a positional relationship between a high-pressure press section 3 and a low-pressure press section 4 when hot-pressing a reaction layer material 1 of a gas diffusion electrode with a press jig 2. 5 is a projection for forming the high-pressure press section 3 in the reaction layer,
Reference numeral 6 denotes a concave portion of the press jig 2 for forming a low-pressure press portion in the reaction layer. The press jig 2 does not necessarily need to be made into an uneven press jig provided with the convex portion 5 and the concave portion 6 as described above. A smooth (flat) press jig is used as the press jig 2, and a mesh-like nickel lath material is used as a substitute for the convex portion 5. Even when used, a non-uniform pressure distribution effect similar to that of an uneven press jig can be obtained. In this case, a conventional press jig can be used as it is, and there is no need to make a special press jig. The nickel lath material may be a metal other than nickel, and the form of the lath material may be a general net-like body.
【００１０】なお、ホットプレスを行う際にステンレス
箔のような硬質金属箔７をプレスジグ２と反応層材料１
の間に挟み圧力分布を制御することが好ましい。こうす
ることより、硬質金属箔であるステンレス箔７の強度と
変形のために、ガス拡散電極の反応層に、単に高圧プレ
ス部３と低圧プレス部４だけでなく、さまざまな圧力分
布を与えることにより、多様性に富んだ反応層を生じる
ことが可能となる。この圧力分布の程度は、硬質金属箔
であるステンレス箔７の厚さを変えることにより制御で
きる。高圧プレス部３と低圧プレス部４だけを使用する
と、その境界部でガス拡散電極を破壊する力が働きやす
いが、硬質金属箔７を用いると境界部での急激な加圧力
の変化が起きるのを防ぐことができる。続いて、本発明
のガス拡散電極の製造方法による反応層の作製手順につ
いて具体的に説明する。When hot pressing is performed, a hard metal foil 7 such as a stainless steel foil is pressed with the press jig 2 and the reaction layer material 1.
It is preferable to control the pressure distribution sandwiched between them. By doing so, it is possible to give various pressure distributions to the reaction layer of the gas diffusion electrode in addition to the high-pressure press section 3 and the low-pressure press section 4 due to the strength and deformation of the stainless steel foil 7 which is a hard metal foil. Thereby, it is possible to generate a reaction layer rich in diversity. The degree of the pressure distribution can be controlled by changing the thickness of the stainless steel foil 7 which is a hard metal foil. When only the high-pressure press section 3 and the low-pressure press section 4 are used, a force for destroying the gas diffusion electrode tends to work at the boundary, but when the hard metal foil 7 is used, a sudden change in the pressing force occurs at the boundary. Can be prevented. Subsequently, a procedure for forming a reaction layer by the method for manufacturing a gas diffusion electrode of the present invention will be specifically described.
【００１１】[0011]
【実施例】ＰＴＦＥ多孔体上に銀とＰＴＦＥから成る反
応層を構成した。先ず、銀微粒子（三井金属工業社製、
Ａｇ−３０１０、平均粒径０．１１ミクロン）５部（重
量、以下同様）にトライトン（界面活性剤）を１部、水
９部を加え超音波分散機で分散させた。これにＰＴＦＥ
ディスパージョンＤ−１（ダイキン工業社製）１部を加
え、攪拌混合した後にエタノールを２０部加え、攪拌す
ることによって自己組織化させた。この沈殿物を孔径
０．８ミクロンの濾紙で濾過し、泥しょうを０．３ｍｍ
厚にゴアテックスに塗布した。８０℃で３時間乾燥、界
面活性剤をエタノール抽出装置で除去し、乾燥した。EXAMPLE A reaction layer composed of silver and PTFE was formed on a porous PTFE material. First, silver fine particles (Mitsui Metals,
One part of Triton (surfactant) and 9 parts of water were added to 5 parts (weight, the same applies hereinafter) of Ag-3010 and an average particle diameter of 0.11 micron, and the mixture was dispersed with an ultrasonic dispersing machine. This is PTFE
One part of Dispersion D-1 (manufactured by Daikin Industries, Ltd.) was added, and the mixture was stirred and mixed. Then, 20 parts of ethanol was added, and the mixture was self-organized by stirring. The precipitate is filtered through a filter paper having a pore diameter of 0.8 micron, and the slurry is removed by 0.3 mm.
Thickly applied to Gore-Tex. After drying at 80 ° C. for 3 hours, the surfactant was removed with an ethanol extractor and dried.
【００１２】平滑なジグにアルミニウム箔、電極シー
ト、アルミニウム箔、厚さ２５ミクロンのステンレス
箔、線径０．２ｍｍ、２０メッシュのニッケルラス材と
を重ね、３５０℃、１０ｋｇ／ｃｍ2 で１０秒間ホット
プレスして電極を得た。An aluminum foil, an electrode sheet, an aluminum foil, a stainless steel foil having a thickness of 25 microns, a nickel lath material having a wire diameter of 0.2 mm and a mesh of 20 mesh are superimposed on a smooth jig, and are heated at 350 ° C. and 10 kg / cm 2 for 10 seconds. Hot pressing was performed to obtain an electrode.
【００１３】ニッケルラス材がジグの凹凸を代用する。
ステンレス箔の厚さを変えることで電極にかかるプレス
圧力分布を変えることが出来る。厚くすれば均一分布に
なり、薄くすれば不均一分布になる。ステンレス箔が無
いとジグの中間は圧力がほとんどかからないが、ステン
レス箔を間挿するとステンレス箔の強度の為に２〜１０
ｋｇ／ｃｍ2 と適正な圧力にすることが出来る。高圧部
は銀同士が溶着して導電性が高く、従来必要とした銀網
が不要になった。ゴアテックスとの剥離強度も十分な強
度になった。この電極の酸素還元性能を測定したとこ
ろ、３０Ａ／ｄｍ2 で０．７８Ｖ（ｖｓ．ＲＨＥ）の高
い性能が得られた。また、ニッケルラスを取り除き、凹
凸プレスジグを使用して、ステンレス箔を間挿した場合
としなかった場合についても試験したが、両方の場合と
も上記と同等の満足できる結果を得た。The nickel lath material substitutes for the jig irregularities.
By changing the thickness of the stainless steel foil, the distribution of the press pressure applied to the electrode can be changed. When the thickness is increased, the distribution becomes uniform, and when the thickness is decreased, the distribution becomes non-uniform. If there is no stainless steel foil, the middle of the jig hardly receives pressure, but if stainless steel foil is inserted, the strength of the stainless steel foil is 2-10.
An appropriate pressure of kg / cm 2 can be obtained. In the high-pressure portion, silver is welded to each other to have high conductivity, and the silver mesh conventionally required becomes unnecessary. The peel strength with Gore-Tex was also sufficient. When the oxygen reduction performance of this electrode was measured, a high performance of 0.78 V (vs. RHE) was obtained at 30 A / dm 2 . In addition, the nickel lath was removed, and a test was conducted with and without a stainless steel foil interposed by using an uneven press jig. In both cases, satisfactory results equivalent to the above were obtained.
【００１４】[0014]
【発明の効果】本発明によれば、ガス拡散電極が、連続
的な凹凸を有するプレスジグを用いて不均一な圧力分布
をガス拡散電極の反応層材料に負荷して作製されるた
め、高圧プレス部と低圧プレス部が混在する反応層が形
成されるので、反応層とガス供給層の剥離強度が高く、
導電性が向上し、しかも電極性能も優れたガス拡散電極
となった。According to the present invention, the gas diffusion electrode is manufactured by applying a non-uniform pressure distribution to the reaction layer material of the gas diffusion electrode using a press jig having continuous irregularities. Part and a low-pressure press part are mixed, a reaction layer is formed, so the peel strength between the reaction layer and the gas supply layer is high,
A gas diffusion electrode having improved conductivity and excellent electrode performance was obtained.
【図１】本発明のガス拡散電極の製造過程の一実施態様
の要部を示す断面説明図である。FIG. 1 is an explanatory cross-sectional view showing a main part of an embodiment of a manufacturing process of a gas diffusion electrode of the present invention.
１ 反応層材料 ２ プレスジグ ３ 高圧プレス部 ４ 低圧プレス部 ５ 凸部 ６ 凹部 ７ ステンレス箔（硬質金属箔） DESCRIPTION OF SYMBOLS 1 Reaction layer material 2 Press jig 3 High pressure press part 4 Low pressure press part 5 Convex part 6 Concave part 7 Stainless steel foil (hard metal foil)
フロントページの続き (72)発明者 古屋 長一 山梨県甲府市中村町２−14 (56)参考文献 特開 平９−279381（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C25B 1/00 - 15/08 H01M 4/88 Continuation of the front page (72) Inventor Choichi Furiya 2-14 Nakamura-cho, Kofu City, Yamanashi Prefecture (56) References JP-A-9-279381 (JP, A) (58) Fields investigated (Int. Cl. 7 , (DB name) C25B 1/00-15/08 H01M 4/88
Claims (3)
エチレンから成る反応層を有するガス拡散電極のホット
プレス時に、連続的な凹凸を有するプレスジグを用いて
不均一な圧力分布とし、かつポリテトラフルオロエチレ
ンの隔点以上の温度でホットプレスすることを特徴とす
るガス拡散電極の製造方法。When a gas diffusion electrode having a reaction layer mainly composed of silver fine particles and polytetrafluoroethylene is hot-pressed, a pressure jig having a non-uniform pressure distribution is formed by using a press jig having continuous irregularities. A method for producing a gas diffusion electrode, comprising hot-pressing at a temperature equal to or higher than the breakpoint.
ス時に、前記連続的な凹凸を有するプレスジグとプレス
されるガス拡散電極の反応層の間に硬質金属箔を挟むこ
とにより圧力分布を制御することを特徴とする請求項１
記載のガス拡散電極の製造方法。2. During hot pressing of the reaction layer of the gas diffusion electrode, pressure distribution is controlled by sandwiching a hard metal foil between the press jig having the continuous irregularities and the reaction layer of the gas diffusion electrode to be pressed. 2. The method according to claim 1, wherein
A method for producing the gas diffusion electrode according to the above.
造方法において、連続的な凹凸を有するプレスジグに代
えて平滑なジグと金属ラス材、金属網等の網状体の組合
せを用いることを特徴とするガス拡散電極の製造方法。3. The method for manufacturing a gas diffusion electrode according to claim 1, wherein a combination of a smooth jig and a mesh member such as a metal lath material and a metal net is used in place of the press jig having continuous irregularities. A method for producing a gas diffusion electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11093098A JP3041791B1 (en) | 1999-03-31 | 1999-03-31 | Manufacturing method of gas diffusion electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11093098A JP3041791B1 (en) | 1999-03-31 | 1999-03-31 | Manufacturing method of gas diffusion electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3041791B1 true JP3041791B1 (en) | 2000-05-15 |
| JP2000282281A JP2000282281A (en) | 2000-10-10 |
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ID=14073057
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3373173B2 (en) | 1999-06-30 | 2003-02-04 | 長一 古屋 | Manufacturing method of gas diffusion electrode |
| KR100791810B1 (en) * | 2002-04-01 | 2008-01-04 | 한국화학연구원 | Manufacturing method of gas diffusion electrode |
| ITMI20060726A1 (en) * | 2006-04-12 | 2007-10-13 | De Nora Elettrodi S P A | ELECTRIC DIFFUSION ELECTRODE FOR CELLS WITH ELECTROLYTE DISCHARGE |
| KR101643593B1 (en) * | 2013-09-06 | 2016-07-29 | 주식회사 엘지화학 | Stack and Folding-Typed Electrode Assembly Having Improved Electrolyte Wetting Property and Method of Preparation of the Same |
| JP7188625B1 (en) | 2022-02-02 | 2022-12-13 | トヨタ自動車株式会社 | water electrolysis cell |
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1999
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