JP5299630B2 - Method for forming catalyst layer of fuel cell - Google Patents
Method for forming catalyst layer of fuel cell Download PDFInfo
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- JP5299630B2 JP5299630B2 JP2009096021A JP2009096021A JP5299630B2 JP 5299630 B2 JP5299630 B2 JP 5299630B2 JP 2009096021 A JP2009096021 A JP 2009096021A JP 2009096021 A JP2009096021 A JP 2009096021A JP 5299630 B2 JP5299630 B2 JP 5299630B2
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/30—Hydrogen technology
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Description
本発明は、電解質膜に触媒成分を吹き付けて触媒層を積層形成する燃料電池の触媒層形成方法に関するものである。 The present invention relates to a method for forming a catalyst layer of a fuel cell, in which a catalyst component is sprayed on an electrolyte membrane to form a catalyst layer.
電解質に高分子膜を用いた固体高分子形燃料電池は、低温で動作し、出力密度が高く、電池寿命が長い等の特徴を有していることから、自動車用、可搬用の動力源として需要が高まっている。
このような燃料電池において、電解質膜に触媒成分を吹き付けて触媒層を形成する触媒層形成方法が知られている。
従来のこの種の触媒層形成方法としては特許文献１に記載の方法があった。
これは、電解質膜の端部に、枠型形状のマスク部材を配設し、マスク部材の上方から電解質膜の積層面に触媒成分を吹き付けて触媒層を形成するという方法である。
A polymer electrolyte fuel cell using a polymer membrane as an electrolyte operates at low temperatures, has a high output density, and has a long battery life. Demand is increasing.
In such a fuel cell, a catalyst layer forming method for forming a catalyst layer by spraying a catalyst component on an electrolyte membrane is known.
As a conventional method for forming this type of catalyst layer, there is a method described in Patent Document 1.
This is a method in which a frame-shaped mask member is disposed at the end of an electrolyte membrane, and a catalyst component is sprayed onto the laminated surface of the electrolyte membrane from above the mask member to form a catalyst layer.
しかしながら上記従来技術では、マスク部材分の材料コストが必要となった。そこで、マスク部材の再利用が考えられるが、この場合はマスク部材の洗浄工程が必要となり、生産性が低くなった。 However, the above prior art requires a material cost for the mask member. Thus, it is conceivable to reuse the mask member, but in this case, a mask member cleaning step is required, and the productivity is lowered.
本発明は、上記のような実情に鑑みなされたもので、低材料コストで生産性よく触媒層形成が可能な燃料電池の触媒層形成方法を提供することを課題とする。 This invention is made | formed in view of the above situations, and makes it a subject to provide the catalyst layer formation method of the fuel cell which can form a catalyst layer with low material cost and high productivity.
上記課題は、燃料電池の触媒層形成方法を下記各態様の構成とすることによって解決される。
各態様は、請求項と同様に、項に区分し、各項に番号を付し、必要に応じて他の項の番号を引用する形式で記載する。これは、あくまでも本発明の理解を容易にするためであり、本明細書に記載の技術的特徴及びそれらの組合わせが以下の各項に記載のものに限定されると解釈されるべきではない。また、１つの項に複数の事項が記載されている場合、それら複数の事項を常に一緒に採用しなければならないわけではなく、一部の事項のみを取り出して採用することも可能である。
The said subject is solved by making the catalyst layer formation method of a fuel cell into the structure of each following aspect.
As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the present invention, and the technical features described in this specification and combinations thereof should not be construed as being limited to those described in the following sections. . In addition, when a plurality of items are described in one section, it is not always necessary to employ the plurality of items together, and it is also possible to take out only a part of the items and employ them.
以下の各項のうち、（１）項が請求項１に対応する。（２）項及び（３）項は請求項に係る発明ではない。 Of the following items, item (1) corresponds to claim 1. Claims (2) and (3) are not claimed inventions.
（１） 外周端部に保護層を枠状に積層接合してなる電解質膜に触媒成分を吹き付けて触媒層を積層形成する燃料電池の触媒層形成方法であって、前記保護層の表面に予め撥水処理を施しておき、この撥水処理された前記保護層に隣接する側の電解質膜部分を端部専用塗布手段によって、残余の電解質膜部分を主塗布手段によって、各々触媒成分を吹き付けて前記電解質膜に触媒層を積層形成することを特徴とする燃料電池の触媒層形成方法。
電解質膜の外周端部に、枠状に保護層が積層接合されている場合には、保護層の絶縁機能を損なわせない限り、電解質膜に触媒成分を吹き付けて触媒層を形成する際のマスク部材として、この保護層を利用できる。
そこで、保護層の表面に撥水処理を施しておき、撥水処理された保護層に隣接する側の電解質膜部分を端部専用塗布手段で触媒成分を吹き付けて触媒層を形成する。これによれば、保護層表面に付着する触媒成分のミストは微小かつ微量となり、保護層の絶縁機能を損なわさせずに、マスク部材なしで、保護層に隣接する側の電解質膜部分の触媒層を形成できる。
残余の電解質膜中央寄り部分は主塗布手段によって触媒層を形成すればよい。
（２） 端部専用塗布手段はスプレーガンであって、前記保護層の表面に対して面直から１５度〜４５度程度のガン角度で触媒層形成側に向けた状態で、前記保護層内周側四方のエッジ見切り塗装をすることにより、前記保護層に隣接する側の電解質膜部分に触媒層を積層形成することを特徴とする（１）項に記載の燃料電池の触媒層形成方法。
本項に記載の発明によれば、触媒成分の塗着効率を低下させずに、保護層表面に付着する触媒成分を微小かつ微量にできる。
（３） 前記撥水処理は、ポリテトラフルオロエチレン溶液のコーティングによることを特徴とする（１）又は（２）項に記載の燃料電池の触媒層形成方法。
本項に記載の発明では、撥水処理にポリテトラフルオロエチレン溶液を用いている。このポリテトラフルオロエチレン溶液は液状の撥水剤として一般的なものであって調達し易く、また撥水効果に優れる。
(1) A method for forming a catalyst layer of a fuel cell, in which a catalyst component is sprayed onto an electrolyte membrane formed by laminating and bonding a protective layer in a frame shape to the outer peripheral edge, and the catalyst layer is formed in advance on the surface of the protective layer. Water repellent treatment is performed, and the catalyst component is sprayed on the electrolyte membrane portion adjacent to the water-repellent protective layer by the end-specific coating means and the remaining electrolyte membrane portion by the main coating means. A method for forming a catalyst layer of a fuel cell, comprising forming a catalyst layer on the electrolyte membrane.
When the protective layer is laminated and joined to the outer peripheral edge of the electrolyte membrane, a mask for forming the catalyst layer by spraying the catalyst component on the electrolyte membrane unless the insulating function of the protective layer is impaired. This protective layer can be used as a member.
Therefore, the surface of the protective layer is subjected to a water repellent treatment, and the catalyst layer is formed by spraying the catalyst component on the electrolyte membrane portion adjacent to the water repellent treated protective layer using an end-only coating means. According to this, the mist of the catalyst component adhering to the surface of the protective layer is minute and minute, and the catalyst layer on the side of the electrolyte membrane adjacent to the protective layer without impairing the insulating function of the protective layer and without the mask member. Can be formed.
What is necessary is just to form a catalyst layer by the main application | coating means in the remaining part near the electrolyte membrane center.
(2) The end-only coating means is a spray gun, and is directed to the catalyst layer forming side at a gun angle of about 15 degrees to 45 degrees from the surface with respect to the surface of the protective layer. The method for forming a catalyst layer for a fuel cell according to (1), wherein a catalyst layer is formed on the electrolyte membrane portion adjacent to the protective layer by performing edge-off coating on the four sides of the circumference.
According to the invention described in this section, the catalyst component adhering to the surface of the protective layer can be made minute and minute without reducing the coating efficiency of the catalyst component.
(3) The method for forming a catalyst layer of a fuel cell according to (1) or (2), wherein the water repellent treatment is performed by coating with a polytetrafluoroethylene solution.
In the invention described in this section, a polytetrafluoroethylene solution is used for the water repellent treatment. This polytetrafluoroethylene solution is common as a liquid water repellent, is easy to procure, and has an excellent water repellent effect.
（１）項に記載の発明によれば、保護層表面に付着する触媒成分のミストを微小、微量として、保護層の絶縁機能を損なわせず、マスク部材なしで電解質膜外周側部分に触媒層を形成できる。したがって、低材料コストで、またマスク部材の洗浄工程を必要とせずに生産性よく、触媒層形成が可能となる。
なお、（２）項及び（３）項に記載の発明は、本発明（特許請求の範囲に記載した発明）ではないので、上記課題を解決するための手段の欄に、その効果を述べた。
According to the invention described in item (1), the catalyst component mist adhering to the surface of the protective layer is made minute or minute so that the insulating function of the protective layer is not impaired, and the catalyst layer is formed on the outer peripheral portion of the electrolyte membrane without a mask member. Can be formed. Therefore, the catalyst layer can be formed at low material cost and with high productivity without requiring a mask member cleaning step.
Since the inventions described in the items (2) and (3) are not the present invention (the invention described in the claims), the effect is described in the column of means for solving the above problems. .
以下、本発明の実施の形態を図面に基づき説明する。なお、各図間において、同一符号は同一又は相当部分を示す。
まず、実施の形態の説明に先立ち、本発明をするに至った経緯について述べる。
固体高分子形の燃料電池においては、電解質膜が薄くて弱いために、その外周端部にフィルムやプレート等からなる保護層を接合したものがある。
図３は、このように外周端部に保護層を積層接合してなる電解質膜を用いた膜−電極接合体（ＭＥＡ：Membrane Electrode Assembly）を備える燃料電池のセルの概略を示す断面図である。
図示するようにセル３０は、高分子膜からなる電解質膜３１の両面に電極となる触媒層３２が積層形成され、各触媒層３２の周囲、つまり電解質膜３１の外周端部にはフィルム等からなる保護層３３が枠状に積層接合されてなるＭＥＡ３４を備える。
触媒層３２及び保護層３３上には、集電及びガスを拡散するための拡散層３５が接合され、更にその外側には、ガス流路３６ａを有するセパレータ３６が各々配設され、ＭＥＡ３４及び拡散層３５部分を両面側から狭持するようにしてセル３０が構成されている。
そして、このようなセル３０が複数個積層されて燃料電池スタックが構成され、燃料電池として発電を行う。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.
First, prior to the description of the embodiments, the background to the present invention will be described.
In some polymer electrolyte fuel cells, the electrolyte membrane is thin and weak, and therefore, a protective layer made of a film, a plate, or the like is bonded to the outer peripheral end portion.
FIG. 3 is a cross-sectional view schematically showing a cell of a fuel cell including a membrane-electrode assembly (MEA: Membrane Electrode Assembly) using an electrolyte membrane in which a protective layer is laminated and bonded to the outer peripheral end portion in this way. .
As shown in the figure, the cell 30 is formed by laminating a catalyst layer 32 serving as an electrode on both surfaces of an electrolyte membrane 31 made of a polymer membrane, and a film or the like around each catalyst layer 32, that is, on the outer peripheral end of the electrolyte membrane 31. The protective layer 33 is provided with an MEA 34 that is laminated and joined in a frame shape.
A diffusion layer 35 for current collection and gas diffusion is joined on the catalyst layer 32 and the protective layer 33, and a separator 36 having a gas flow path 36 a is disposed outside the diffusion layer 35. The cell 30 is configured so as to sandwich the layer 35 portion from both sides.
A plurality of such cells 30 are stacked to constitute a fuel cell stack, and power is generated as a fuel cell.
このような保護層付きの電解質膜３１を用いたＭＥＡ３４では、保護層３３は電気的に絶縁する機能をもつが、保護層３３の表面に、電極となる触媒成分がミスト状に付着しても微量であれば上記絶縁機能は損なわれない。
したがって、このようなＭＥＡ３４において、保護層３３が電解質膜３１の外周端部に枠状に積層接合されていることは、保護層３３の絶縁機能を損なわせない限り、電解質膜３１に触媒成分を吹き付けて触媒層３２を形成する際のマスク部材として、この保護層３３を利用できることを意味する。
In the MEA 34 using the electrolyte membrane 31 with such a protective layer, the protective layer 33 has a function of electrically insulating, but even if a catalyst component serving as an electrode adheres to the surface of the protective layer 33 in a mist form. If it is trace amount, the said insulation function will not be impaired.
Therefore, in such an MEA 34, the protective layer 33 is laminated and joined in a frame shape to the outer peripheral end portion of the electrolyte membrane 31 as long as the insulating function of the protective layer 33 is not impaired. This means that the protective layer 33 can be used as a mask member when the catalyst layer 32 is formed by spraying.
そこで本発明者等は、鋭意実験、検討の結果、上記保護層３３の表面に撥水処理を施しておき、この撥水処理された保護層３３に隣接する側の電解質膜部分を端部専用の塗布手段で触媒成分を吹き付けて触媒層３２を形成すれば、保護層３３表面に付着する触媒成分のミストは微小かつ微量となることを見い出すに至った。
したがって、上記のような方法で触媒層３２を形成すれば、保護層３３の絶縁機能を損なわさせずに、しかもマスキングプレートやマスキングフィルム等のマスク部材なしで、保護層３３に隣接する側の電解質膜部分の触媒層３２を形成できる。
残余の電解質膜部分、つまり保護層３３に隣接する側よりも中央寄りの電解質膜部分は、外周形状に特段の注意を払う必要は少ないので、一般的な塗布手段によって触媒成分を吹き付け、触媒層３２を形成すればよい。
Accordingly, the present inventors have made a water repellent treatment on the surface of the protective layer 33 as a result of diligent experiments and examinations, and the electrolyte membrane portion on the side adjacent to the water repellent treated protective layer 33 is used exclusively for the end portion. If the catalyst layer 32 is formed by spraying the catalyst component with this coating means, the mist of the catalyst component adhering to the surface of the protective layer 33 is found to be minute and minute.
Therefore, if the catalyst layer 32 is formed by the method as described above, the electrolyte on the side adjacent to the protective layer 33 without damaging the insulating function of the protective layer 33 and without a mask member such as a masking plate or a masking film. The catalyst layer 32 of the membrane part can be formed.
Since the remaining electrolyte membrane portion, that is, the electrolyte membrane portion closer to the center than the side adjacent to the protective layer 33, is less required to pay special attention to the outer peripheral shape, the catalyst component is sprayed by a general coating means, 32 may be formed.
次に、本発明の実施形態を説明する。
図１は、本発明による燃料電池の触媒層形成方法の一実施形態の説明図であり、図２は、本実施形態により触媒層が形成されたＭＥＡの断面を模式的に示す図である。
図１に示すように、本実施形態は、外周端部に保護層３３を枠状に積層接合してなる電解質膜３１に後述する触媒成分を吹き付けて触媒層３２を積層形成する燃料電池の触媒層形成方法であって、電解質膜３１の外周端部に枠状に積層接合してある保護層３３の表面に、予め撥水処理を施しておく。
ここで、電解質膜３１及び触媒層３２は、固体高分子形燃料電池のＭＥＡ３４の製造に通常用いられる材料からなる。例えば、電解質膜３１はイオン交換樹脂材からなり、また触媒層３２は例えば白金等を含む電極触媒材からなる。触媒層３２は白金等を含む液状の触媒成分３２ａを電解質膜３１に吹き付けることにより形成される。保護層３３は例えばＰＥＮ（ポリエチレンナフタレート）フィルム等からなる。
撥水処理は、本実施形態では撥水剤としてＰＴＦＥ（ポリテトラフルオロエチレン）溶液を保護層３３の表面にコーティングする等により施される。ＰＴＦＥ溶液は液状の撥水剤として一般的なものであって調達し易く、また撥水効果に優れる。
図中、１１は、保護層３３の表面にＰＴＦＥ溶液をコーティングしてなる撥水処理層である。
Next, an embodiment of the present invention will be described.
FIG. 1 is an explanatory view of one embodiment of a method for forming a catalyst layer of a fuel cell according to the present invention, and FIG. 2 is a diagram schematically showing a cross section of an MEA on which a catalyst layer is formed according to this embodiment.
As shown in FIG. 1, the present embodiment is a fuel cell catalyst in which a catalyst component 32, which will be described later, is sprayed on an electrolyte membrane 31 formed by laminating and bonding a protective layer 33 in a frame shape at the outer peripheral end portion. In this layer forming method, the surface of the protective layer 33 that is laminated and joined in a frame shape to the outer peripheral end of the electrolyte membrane 31 is subjected to a water repellent treatment in advance.
Here, the electrolyte membrane 31 and the catalyst layer 32 are made of a material normally used for manufacturing the MEA 34 of the polymer electrolyte fuel cell. For example, the electrolyte membrane 31 is made of an ion exchange resin material, and the catalyst layer 32 is made of an electrode catalyst material containing, for example, platinum. The catalyst layer 32 is formed by spraying a liquid catalyst component 32 a containing platinum or the like on the electrolyte membrane 31. The protective layer 33 is made of, for example, a PEN (polyethylene naphthalate) film.
In this embodiment, the water repellent treatment is performed by coating the surface of the protective layer 33 with a PTFE (polytetrafluoroethylene) solution as a water repellent. PTFE solutions are common as liquid water repellents, are easy to procure, and have an excellent water repellent effect.
In the figure, 11 is a water-repellent treatment layer formed by coating the surface of the protective layer 33 with a PTFE solution.
本実施形態では、電解質膜３１への触媒成分３２ａの吹付けを、上記のように撥水処理を表面に施した保護層３３に隣接する側の電解質膜部分（以下、電解質膜外周側部分と記す。）３１ａと、その残余の部分、つまり保護層３３に隣接する側の部分を除いた残り全ての電解質膜部分（以下、電解質膜中央寄り部分と記す。）３１ｂとに分けて行う。
この場合、上記電解質膜外周側部分３１ａは端部専用塗布手段１２によって、残余の電解質膜中央寄り部分３１ｂは主塗布手段１３によって、各々容器１４内からの触媒成分３２ａを吹き付け、触媒層３２全体を形成する。塗布手段１２，１３はいずれもスプレーガンである。
In the present embodiment, the catalyst component 32a is sprayed onto the electrolyte membrane 31 by the electrolyte membrane portion adjacent to the protective layer 33 that has been subjected to the water-repellent treatment as described above (hereinafter referred to as the outer peripheral portion of the electrolyte membrane). 31a and the remaining portion, that is, all remaining electrolyte membrane portions excluding the portion adjacent to the protective layer 33 (hereinafter referred to as the portion near the center of the electrolyte membrane) 31b.
In this case, the outer peripheral portion 31a of the electrolyte membrane is sprayed with the catalyst component 32a from the inside of the container 14 by the dedicated coating means 12 for the end portion, and the central portion 31b of the remaining electrolyte membrane is sprayed by the main coating means 13, respectively. Form. The application means 12 and 13 are both spray guns.
両塗布手段１２，１３のうち、主塗布手段１３は、従来からこの種の触媒成分３２ａの吹付けに一般的に用いられている程度のスプレー角度を有する塗布手段である。
また端部専用塗布手段１２は、主塗布手段１３に比べてスプレー角度（吹付け広がり角度）が狭く、狙いを定め易い塗布手段であり、電解質膜３１の表面に対する吹付け角度等を適宜調整して触媒成分３２ａを吹き付け、触媒層３２を形成すれば、保護層３３の表面に付着する触媒成分３２ａのミストは微小かつ微量となる。
具体的には、保護層３３の表面に対して面直から１５度〜４５度程度のガン角度θ１で触媒層形成側に向けた（保護層３３の外周側に倒した）状態で、保護層内周側四方のエッジ見切り塗装をすることにより、電解質膜外周側部分３１ａに触媒層３２を積層形成する。
ガン角度θ１を、保護層３３の表面に対して面直から１５度〜４５度程度としたのは、１５度未満であると、電解質膜３１の表面における触媒成分３２ａの跳ね返りが多くなって保護層３３の表面に付着する触媒成分３２ａのミストを微小かつ微量とすることが困難になるからである。また、４５度を超えると触媒成分３２ａの電解質膜３１の表面への塗着効率が下がるからである。図１では、ガン角度θ１がぼぼ２０度である場合を例示している。
Of the two application means 12 and 13, the main application means 13 is an application means having a spray angle of a level conventionally used for spraying this type of catalyst component 32a.
Further, the end-only coating unit 12 is a coating unit that has a narrower spray angle (spraying spread angle) than the main coating unit 13 and is easy to aim, and appropriately adjusts the spraying angle and the like on the surface of the electrolyte membrane 31. If the catalyst component 32a is sprayed to form the catalyst layer 32, the mist of the catalyst component 32a adhering to the surface of the protective layer 33 becomes minute and minute.
Specifically, the protective layer is directed toward the catalyst layer forming side (tilted to the outer peripheral side of the protective layer 33) at a gun angle θ1 of about 15 to 45 degrees from the surface with respect to the surface of the protective layer 33. The catalyst layer 32 is laminated and formed on the electrolyte membrane outer peripheral portion 31a by coating the inner peripheral four sides of the edges.
The reason why the gun angle θ1 is set to about 15 to 45 degrees with respect to the surface of the protective layer 33 is less than 15 degrees, when the angle of the catalyst component 32a on the surface of the electrolyte membrane 31 increases, This is because it becomes difficult to make the mist of the catalyst component 32a adhering to the surface of the layer 33 minute and minute. Further, if it exceeds 45 degrees, the efficiency of applying the catalyst component 32a to the surface of the electrolyte membrane 31 is lowered. FIG. 1 illustrates the case where the gun angle θ1 is approximately 20 degrees.
以上述べたように本実施形態では、外周端部に保護層３３を枠状に積層接合してなる電解質膜３１に触媒成分３２ａを吹き付けて触媒層３２を積層形成する燃料電池の触媒層形成方法において、上記保護層３３の表面に予め撥水処理層１１を施し、これに隣接する電解質膜外周側部分３１ａを端部専用塗布手段１２によって、残余の電解質膜中央寄り部分３１ｂを主塗布手段１３によって、各々触媒成分３２ａを吹き付けて全体の触媒層３２を形成した。 As described above, in this embodiment, a catalyst layer forming method for a fuel cell in which the catalyst layer 32 is stacked by spraying the catalyst component 32a on the electrolyte membrane 31 formed by laminating and bonding the protective layer 33 in a frame shape to the outer peripheral end. The surface of the protective layer 33 is preliminarily provided with the water-repellent treatment layer 11, the electrolyte membrane outer peripheral side portion 31 a adjacent thereto is applied by the end-only application means 12, and the remaining electrolyte membrane central portion 31 b is the main application means 13. Thus, each catalyst component 32a was sprayed to form the entire catalyst layer 32.
これによれば、保護層３３の表面に付着する触媒成分３２ａのミストを微小かつ微量として、保護層３３の絶縁機能を損なわせることなく、しかもマスク部材なしで電解質膜外周側部分３１ａに触媒層３２を形成できる。したがって、マスク部材にかかるコストを要せずに、またマスク部材の洗浄工程を必要としないので生産性よく、触媒層３２の形成が可能となる。
残余の電解質膜中央寄り部分３１ｂは主塗布手段１３によって従前通り触媒層３２を形成できるので、端部専用塗布手段１２による効果を有しつつ、触媒層全体を生産性よく形成できる。
According to this, the mist of the catalyst component 32a adhering to the surface of the protective layer 33 is made minute and minute so that the insulating function of the protective layer 33 is not impaired and the catalyst layer is formed on the electrolyte membrane outer peripheral portion 31a without a mask member. 32 can be formed. Therefore, the cost for the mask member is not required, and the cleaning process for the mask member is not required, so that the catalyst layer 32 can be formed with high productivity.
Since the catalyst layer 32 can be formed by the main coating means 13 as before in the remaining portion 31b of the electrolyte membrane, the entire catalyst layer can be formed with high productivity while having the effect of the end-only coating means 12.
特に、端部専用塗布手段１２のガン角度θ１を、保護層３３の表面に対して面直から１５度〜４５度程度、触媒層形成側に向けた状態で、保護層内周側四方のエッジ見切り塗装して電解質膜外周側部分３１ａの触媒層形成をしたことによれば、触媒成分３２ａの塗着効率を低下させずに、保護層３３の表面に付着する触媒成分３２ａを微小かつ微量にできる効果がある。 In particular, when the gun angle θ1 of the end-only coating means 12 is about 15 to 45 degrees from the surface perpendicular to the surface of the protective layer 33 and is directed toward the catalyst layer forming side, the edges on the inner peripheral side of the protective layer When the catalyst layer is formed on the outer peripheral portion 31a of the electrolyte membrane by part-off coating, the catalyst component 32a adhering to the surface of the protective layer 33 can be made minute and minute without reducing the coating efficiency of the catalyst component 32a. There is an effect that can be done.
１１：撥水処理層、１２：端部専用塗布手段、１３：主塗布手段、３１：電解質膜、
３１ａ：電解質膜外周側部分（保護層に隣接する側の電解質膜部分）、３１ｂ：電解質膜中央寄り部分（残余の電解質膜部分）、３２：触媒層、３２ａ：触媒成分、３３：保護層、θ１：ガン角度。
11: Water repellent treatment layer, 12: End-only coating means, 13: Main coating means, 31: Electrolyte film,
31a: electrolyte membrane outer peripheral side portion (electrolyte membrane portion adjacent to the protective layer), 31b: electrolyte membrane central portion (remaining electrolyte membrane portion), 32: catalyst layer, 32a: catalyst component, 33: protective layer, θ1: Gun angle.
Claims (1)
前記保護層の表面に予め撥水処理を施しておき、
この撥水処理された前記保護層に隣接する側の電解質膜部分を端部専用塗布手段によって、残余の電解質膜部分を主塗布手段によって、各々触媒成分を吹き付けて前記電解質膜に触媒層を積層形成することを特徴とする燃料電池の触媒層形成方法。 A method for forming a catalyst layer of a fuel cell, wherein a catalyst component is sprayed onto an electrolyte membrane formed by laminating and joining a protective layer in a frame shape to an outer peripheral end portion,
The surface of the protective layer has been subjected to a water repellent treatment in advance,
The electrolyte membrane portion adjacent to the water-repellent protective layer is laminated with a catalyst component on the electrolyte membrane by spraying catalyst components on the electrolyte membrane portion adjacent to the end portion and the remaining electrolyte membrane portion on the main coating means. A method for forming a catalyst layer of a fuel cell, comprising forming the catalyst layer.
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