JPS6056370A - Manufacture of gas electrode - Google Patents

Manufacture of gas electrode

Info

Publication number
JPS6056370A
JPS6056370A JP58164023A JP16402383A JPS6056370A JP S6056370 A JPS6056370 A JP S6056370A JP 58164023 A JP58164023 A JP 58164023A JP 16402383 A JP16402383 A JP 16402383A JP S6056370 A JPS6056370 A JP S6056370A
Authority
JP
Japan
Prior art keywords
electrode
gas
gas electrode
net
film
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
Application number
JP58164023A
Other languages
Japanese (ja)
Inventor
Akira Kato
昭 加藤
Kyoichi Tange
恭一 丹下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP58164023A priority Critical patent/JPS6056370A/en
Publication of JPS6056370A publication Critical patent/JPS6056370A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8803—Supports for the deposition of the catalytic active composition
    • H01M4/8807—Gas diffusion layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8663—Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers
    • H01M4/8668—Binders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8825—Methods for deposition of the catalytic active composition
    • H01M4/8828—Coating with slurry or ink
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8882—Heat treatment, e.g. drying, baking
    • H01M4/8885—Sintering or firing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/96—Carbon-based electrodes
    • 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

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inert Electrodes (AREA)

Abstract

PURPOSE:To obtain a thin gas electrode having excellent strength and life as well as a maintained superior electrode performance by fixing a film containing fluorine over one surface of a gas-side plate during the sintering of a temporarily molded gas electrode. CONSTITUTION:An active agent principally consisting of carbon powder is combined with an aqueous suspension containing a fluorine resin to prepare a carbon paste. Next, the carbon paste is dried and pulverized to make a powder which is then applied only to the electrolyte-side surface of a metallic current collector net 2 made of a member such as Ni before the thus obtained body is subjected to pressure molding. After that, the thus molded body is sintered to make a gas electrode consisting of an active layer 1 and the metallic current collector net 2. Next, a film 3 consisting of a compound containing fluorine such as a fluorine resin is placed on the gas-side of the net 2 of the gas electrode. After that, the thus obtained body is resintered to cause the film 3 to adhere to the metallic net 2, thereby making a gas electrode (A). Since the gas electrode (A) has a small internal resistance and electrons easily move within the electrode (A), it is possible to increase the performance of the battery.

Description

【発明の詳細な説明】 本発明は、ガス電極の製造方法に関し、詳しく＆Ｊ、カ
ーボン粉末を主体とした活性剤に、弗素樹脂を含む水性
懸濁液を添加し、乾燥後、釘び粉末化し、ついで、極板
状に仮成形した後、焼成するガス電極の、ガス側極板の
片面全面に、弗素樹脂等の弗素を含有した被膜を付着さ
せ、電極性能を改善したガス電極の製造方法にががる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a gas electrode. A method for manufacturing a gas electrode in which a fluorine-containing coating such as a fluororesin is adhered to the entire surface of one side of the gas side electrode plate of the gas electrode which is then temporarily formed into an electrode plate shape and then fired to improve electrode performance. bitter.

燃料電池に用いるガス電極は、多孔性カーボンに、鏡、
白金、パラジウム等を触媒として添加したもの、あるい
は、ニッケル、銀等の焼結体に、触媒を添加したもの等
が使用される。Gas electrodes used in fuel cells are made of porous carbon, mirrors,
Those to which platinum, palladium, etc. are added as a catalyst, or those to which a catalyst is added to a sintered body of nickel, silver, etc., are used.

しかし、ニッケルの焼結体を主体とした電極は多孔度、
孔径等電極の什能に、大きな影響をも°っ因子を、適度
に調整することが困ｔＩｔである。However, electrodes mainly made of sintered nickel have porosity and
It is difficult to appropriately adjust factors such as pore diameter, which have a large influence on the performance of the electrode.

また、祠料自体が高価であることがら、力゛スミ極とし
ても高価となる欠点がある。Furthermore, since the abrasive material itself is expensive, it also has the disadvantage that it is also expensive as a polishing tool.

一方、多孔性カーボンを用いれば、上記のような、価格
上の問題は解決できるものの、電極性能に大きな影響を
与える、導電性が悪くなることがら、高導電性のカーボ
ンを用いる必要がある。On the other hand, if porous carbon is used, the above-mentioned cost problem can be solved, but since the conductivity deteriorates, which greatly affects electrode performance, it is necessary to use highly conductive carbon.

ところが、高導電性カーボンは、オイルなどの炭化水素
を不完全燃焼して、生成したものが多くその電極とし゛
この成形方法がむずかしいといら欠点がある。However, highly conductive carbon is often produced by incompletely burning hydrocarbons such as oil, and has the disadvantage that it is difficult to mold when used as an electrode.

また、電極材料として、白金、パラジウム等の触媒を担
持したカーボン粉末に、撥水作用をもった弗素樹脂を混
ぜ　集電材として金網を介在させて成形した、ガス電極
も用いられている。In addition, gas electrodes are also used, which are made by mixing carbon powder supporting catalysts such as platinum or palladium with water-repellent fluororesin and molding the mixture with a wire mesh interposed as a current collector.

しかし、上述のガス電極は、強度確保のため、極板部を
適度な型さとする必要がある。However, in the above-mentioned gas electrode, the electrode plate portion needs to have an appropriate shape in order to ensure strength.

ところが、ガス電極の極板部厚さを厚くすると、電気抵
抗が大きくなるため、電極性能が劣化するという欠点が
ある。However, if the thickness of the electrode plate of the gas electrode is increased, the electrical resistance increases, resulting in a disadvantage that the electrode performance deteriorates.

また、ガス電極の強度・寿命を向上させるため、適音の
方法で、弗素樹脂を多量に添加したガス電極では、ガス
電極の強度・寿命は優れているものの、極板部内部に弗
素樹脂が、はぼ一様に分散しているため、電極性能が低
下する欠点がある。In addition, in order to improve the strength and life of the gas electrode, a large amount of fluororesin is added in an appropriate manner. Although the strength and life of the gas electrode is excellent, the fluororesin is inside the electrode plate. , because they are uniformly dispersed, there is a drawback that the electrode performance deteriorates.

さらに、このようなガス電極を用いて放電を続けると、
電解液がガス電極内部に浸透・通過して力゛ス側まで進
み、液洩れが発生する欠点がある。Furthermore, if we continue discharging using such a gas electrode,
The drawback is that the electrolytic solution permeates and passes through the gas electrode and reaches the power side, causing leakage.

本発明は、カーボン粉末を主体とした活性剤に、弗素樹
脂を含む水性懸濁液を添加して、乾燥後、再び粉末化し
、ついで、極板上に仮成形した後、焼成してなるガス電
極のガス側片面全面に、弗素を含有す？）被膜を付着さ
セることによって、ガス電極の厚さを薄くしで、（λれ
た電極性１１Ｌ金維持しつつ、しかも、電極強度・寿命
Ｃ，二優れたガス電極の製造方法を提供することを目的
としている。In the present invention, an aqueous suspension containing a fluororesin is added to an activator mainly composed of carbon powder, and after drying, the mixture is powdered again, and then, after being temporarily formed on an electrode plate, it is fired. Does the entire gas side of the electrode contain fluorine? ) By attaching a film, the thickness of the gas electrode is reduced, thereby providing a method for manufacturing a gas electrode with excellent electrode strength and life C, while maintaining the low polarity (11L gold). It is intended to.

このようなトＪ的は、本発明によれば、カーボン粉末を
主体とした活性剤に、弗素樹脂を々む水性懸濁液を添加
し１、乾燥後、再び粉末化し、ついで、極板状に仮成形
した後、焼成するガス電極の製造方法であって〜 前記ガス電極のガス側極板の片叩全面に、弗素１）・ｌ
脂等の弗素を含有した被膜を、焼成工程と間Ｉｌ）、な
いし、焼成後にり！〜処理工惺を設Ｌ３で、そのいづれ
かの工程によって、付着させることを、’４！＋　ｒｂ
と”３る、ガス電極のｌｉ！造方法シこよって達成され
る。According to the present invention, an aqueous suspension containing a fluororesin is added to an activator mainly composed of carbon powder, which is then dried and powdered again. A method for producing a gas electrode, which comprises provisionally forming the gas electrode and then firing it, wherein fluorine 1).
A film containing fluorine such as fat is applied during the firing process or after the firing process. ~ Set up a processing facility at L3, and attach it through one of the processes in '4! ＋rb
This is achieved by the method of manufacturing the gas electrode.

以下、添（４図面に基づいて、４、発明の詳細な説明す
る。Hereinafter, a detailed explanation of the invention will be given based on the accompanying drawings.

第１図に示Ｊガス電極製造工程ヌ１において、オイルの
不完全燃焼（いわゆるオイルファーネフ法）によって生
成したカーボン粉末乙こ、弗素樹脂を６０重量％を含む
水性４’ｉ；　ｌ蜀液（弗素Ｉ］脂ディスパージョン）
を添加して、弗素樹脂を３０市量％を含む、カーボンペ
ーストを作製した。In the J gas electrode manufacturing process No. 1 shown in FIG. 1, carbon powder produced by incomplete combustion of oil (so-called oil farnef method), aqueous liquid containing 60% by weight of fluororesin; (Fluorine I] fat dispersion)
was added to prepare a carbon paste containing 30% by weight of fluororesin.

ついで、このカーボンペーストを、乾燥炉中７０〜１０
０℃で乾燥させた後、わ〕砕殿にご粉砕して、弗素樹脂
を含むカーボン粉本とする。Then, this carbon paste was dried in a drying oven for 70 to 10 minutes.
After drying at 0°C, the powder is crushed to obtain carbon powder containing fluororesin.

この弗素樹脂粉末を含んだカーボン粉末を、集電用Ｎｉ
製金網２の電解液（ｐす片面のめに塗布し、２０ｋｇ／
ｃｉＧの加圧力でプレス成形した。The carbon powder containing this fluororesin powder was
Electrolyte solution (applied to one side of wire mesh 2, 20 kg/
Press molding was performed using a pressure of ciG.

このようにして、仮成形したガス電極を不活性雰囲気の
電気炉中で、３７０〜３８０°Ｃン１０分間保持するこ
とによって、弗素樹脂粉末を含んだカーボン粉末を焼結
することによっ−ζできた゛活牲凧１と、集電用Ｎｉ製
金網２からなるガス電極Ａ′を作製した。By holding the temporarily formed gas electrode in an electric furnace in an inert atmosphere at 370 to 380°C for 10 minutes, the carbon powder containing the fluororesin powder is sintered. A gas electrode A' consisting of the resulting active kite 1 and a Ni wire mesh 2 for current collection was fabricated.

このガス電極Ａ′のＮｉ製金網２例（ガス側）に、ガス
電極と同し寸法の厚さ１００μｍの弗素樹脂被膜３を載
置して、再び、不活性雰囲気の電気炉中で、２６０〜ｂ Ｇこより、弗素樹脂被膜３をＮｉ製金梱２に付着させ、
ガス電極Ａを作製した。A 100 μm thick fluororesin coating 3 having the same dimensions as the gas electrode was placed on two examples of the Ni wire mesh (gas side) of the gas electrode A', and the film was heated again for 260 µm in an electric furnace in an inert atmosphere. ~b From G, the fluororesin coating 3 is attached to the Ni metal package 2,
Gas electrode A was produced.

上記によって作製したガス電極Δの断面図を、第２図に
示す。A cross-sectional view of the gas electrode Δ produced as described above is shown in FIG. 2.

つぎに、この電極Ａの電極性能測定方法を、第３図に示
す。Next, a method for measuring electrode performance of this electrode A is shown in FIG.

ｉ４．ｌ］定方法は、外部電源４を用い、ガス電）垢Δ
と白金板５の間に電流をながし、ガス電極へ〇電１イ！
を、Ｊｉｇ／　ｌＩｇｏの照合電極６と比較するもので
あ・乙。i4. l] The determination method uses an external power supply 4, and the
A current is passed between the platinum plate 5 and the gas electrode.
This is to compare with reference electrode 6 of Jig/lIgo.

なお、電が１讐′皮フには、６規定のにＯＨ水溶液を用
いた。In addition, a 6N OH aqueous solution was used for the irradiation.

上記により作製したガス電極への電極を目）旨を、従来
のガス電極と比較して第４図（、こ示す。The gas electrode produced as described above is shown in FIG. 4 in comparison with a conventional gas electrode.

第４図から明らかなように、本発明のカス電極Δは、従
来電極に比べて著しく電橋性能が優れていることがわか
る。As is clear from FIG. 4, it can be seen that the cass electrode Δ of the present invention has significantly better bridge performance than the conventional electrode.

以上により明らかなように、本発明にかかろ力゛スミ極
の製造方法によれば、 ■、電極強度を低下させることなく、ガス電極の厚さを
薄くできることから、ガス電極の内部抵抗が小さくなり
、電子が電極内を移すルやすくスフって、電極性能が向
上する。As is clear from the above, according to the method of manufacturing a filtering force sum electrode according to the present invention, (1) the thickness of the gas electrode can be reduced without reducing the electrode strength, so the internal resistance of the gas electrode can be reduced. , electrons move easily within the electrode, improving electrode performance.

■、ガス電極のガス側片面全面に、力′）、ｌｅｔ通す
が電解液は浸透させない、弗素４含んだ被膜を付着させ
ることにより、ガス電極内を電解液が浸透通過すること
がなく、ガス電極の寿命を飛曜的に向上する、二とがで
きる。(2) By attaching a film containing fluorine 4 to the entire surface of one side of the gas side of the gas electrode, which allows the electrolyte to pass through but not the electrolyte, the electrolyte does not permeate through the gas electrode. Two things can be done to dramatically improve the life of the electrode.

等の利点がある。There are advantages such as

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明にかかる実施例のガス電極製造工程を
示す図、第２図は、本発明にかかる実施（（すのガス電
極への断面図、第３図は、ガス電極の電極δ１定方法の
概略図、第４図は、ガス電極の電極性能測定結果を示す
図である。 １−−−一活性眉 ２、−−−−−１４４製金網 ３−−−−−弗素樹脂被膜 ４−　・−外部電源 ５−−−−−白金板 ６−−−−一〜照合電極 ７−−−−・−？１１解ン夜 Ａ　−−−一本発明のガス電極 第１図 第２図 第３図 （ｍ）１ 第４図FIG. 1 is a diagram showing the gas electrode manufacturing process of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the gas electrode according to the present invention, and FIG. A schematic diagram of the method for determining δ1, and FIG. 4 is a diagram showing the electrode performance measurement results of the gas electrode. Coating 4 - External power source 5 ---- Platinum plate 6 ----1 ~ Reference electrode 7 -------・-?11 Solution A ----1 Gas electrode of the present invention Fig. 1 Figure 2 Figure 3 (m) 1 Figure 4

Claims (1)

【特許請求の範囲】 １、カーボン粉末を主体とした活性剤に、弗素樹脂を含
む水性懸濁液を添加し、乾燥後、再び粉末化し、ついで
、極板状に仮成形した後、焼成するガス電極の製造方法
であって、 前記ガス電極のガス側極板の片面全面に、弗素柚１脂等
の弗素を含有した被膜を、焼成二［程と同時、ないし、
焼成後に熱処理工程を設けて、そのいづれかの工程によ
って、付着させることを特徴とする、ガス電極の製造方
法。[Claims] 1. An aqueous suspension containing a fluororesin is added to an activator mainly composed of carbon powder, dried and powdered again, then temporarily formed into an electrode plate shape and then fired. A method for manufacturing a gas electrode, the method comprising: applying a film containing fluorine such as fluorine yuzu 1 fat to one entire surface of the gas side electrode plate of the gas electrode, simultaneously with or at the same time as the second firing step;
A method for manufacturing a gas electrode, characterized in that a heat treatment step is provided after firing, and the electrode is attached by one of the steps.
JP58164023A 1983-09-06 1983-09-06 Manufacture of gas electrode Pending JPS6056370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58164023A JPS6056370A (en) 1983-09-06 1983-09-06 Manufacture of gas electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58164023A JPS6056370A (en) 1983-09-06 1983-09-06 Manufacture of gas electrode

Publications (1)

Publication Number Publication Date
JPS6056370A true JPS6056370A (en) 1985-04-01

Family

ID=15785320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58164023A Pending JPS6056370A (en) 1983-09-06 1983-09-06 Manufacture of gas electrode

Country Status (1)

Country Link
JP (1) JPS6056370A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005032569A (en) * 2003-07-14 2005-02-03 Toagosei Co Ltd Complex of fluororesin and carbon particulate, gas diffusion electrode, and fuel cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005032569A (en) * 2003-07-14 2005-02-03 Toagosei Co Ltd Complex of fluororesin and carbon particulate, gas diffusion electrode, and fuel cell

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