JP2007207728A - Separator for polymer electrolyte fuel cell, method for producing the same, and polymer electrolyte fuel cell - Google Patents

Abstract

Provided is a separator for a polymer electrolyte fuel cell that can achieve both hydrophilicity or hydrophobicity and conductivity.
A substrate 1 that is roughened by forming fine irregularities on at least a part of a surface of an electrode side of a polymer electrolyte fuel cell and is made of a conductive material; And a water wettability adjusting member 2 that covers the concave portion. A conductive material is used as a material for the separator, and the surface that controls hydrophilicity or hydrophobicity is roughened, and the surface of the concave and convex portions generated by the roughening is hydrophilic or hydrophobic. By selectively filling the water wettability adjusting member for adjusting the properties, desired hydrophilicity or hydrophobicity and conductivity can be compatible. That is, the hydrophilicity or hydrophobicity of the surface is controlled by the water wettability adjusting member filled in the concave portion of the rough surface, and the conductivity is secured by the convex portion of the rough surface.
[Selection] Figure 1

Description

  The present invention relates to a separator for a polymer electrolyte fuel cell and a polymer electrolyte fuel cell employing the separator.

  A fuel cell is a device that generates electricity by causing an electrochemical reaction between a fuel such as hydrogen and oxygen in the atmosphere. By the way, a polymer electrolyte fuel cell has attracted attention as a kind of fuel cell. The solid polymer fuel cell includes a membrane electrode assembly having a solid polymer electrolyte membrane, an electrode membrane and a diffusion layer sandwiched from both sides, and a separator that sandwiches the membrane electrode assembly from both sides. The separator is a member that is required to have various functions and effects such as forming a flow path for fuel and air or collecting current.

  In the fuel cell, water is generated at the electrode by the cell reaction. The generated water passes from the electrode through the diffusion layer and the flow path formed in the separator and is discharged to the outside of the fuel cell. In addition, many solid polymer electrolyte membranes currently under study are made of a material that exhibits proton conductivity in the presence of water. Thus, although the presence of moisture is indispensable in the fuel cell, water is continuously generated, so it is desirable to appropriately control the addition of water from the outside and the discharge of the water generated inside. It is. In order to properly control moisture, it is desirable to control the hydrophilicity of the fuel cell separator surface.

  As a method for controlling the water wettability of the surface of the fuel cell separator, there is a method of forming a hydrophilic film or a hydrophobic film on the surface.

  Further, Patent Document 1 discloses a fuel cell separator in which the surface of a molded body made of carbon and a phenol resin is made hydrophilic and the dissolution of a power generation inhibiting substance is suppressed. Specifically, an epoxy resin having hydrophilicity and a small amount of a power generation inhibiting substance is used, and this is superimposed on a molded body and applied and heat-cured to form a hydrophilic surface and a power generation inhibiting substance suppressing layer. And the metal oxide (titanium oxide, tin oxide) is added in the epoxy resin which is an insulator, and the raise of the contact resistance which leads to the power generation performance fall of a fuel cell is suppressed.

In patent document 2, when manufacturing a separator by press-molding with a metal mold | die, the method of mixing a hydrophilic substance previously with the carbon material which is an original molding material is disclosed. This method does not require a complicated process because the hydrophilization is completed at the same time as the press molding, and the electrical conductivity of the formed hydrophilized film is low as in the conventional hydrophilic treatment. There is no need to remove the surface layer portion (hydrophilized film).
JP 2003-217608 A Japanese Patent Laid-Open No. 10-3931

  However, the separator for a fuel cell described in Patent Document 1 does not have sufficient hydrophilicity of the epoxy resin employed for hydrophilization. Moreover, although the epoxy resin can be expected to reduce the elution of the power generation inhibiting substance that reduces the power generation performance, the conductivity is not sufficient. In the fuel cell separator of Patent Document 1, metal oxide is dispersed in order to impart conductivity and suppress metal elution, but the metal oxide is a semiconductor, and there is a limit to reducing the resistance of the separator. .

  In addition, in the fuel cell separator described in Patent Document 2, the resin that disperses the added hydrophilic substance gathers on the surface, and not only the improvement in hydrophilicity can be expected, but the resin gathered on the surface acts as an insulating layer. Also become.

  The present invention has been made in view of the above circumstances, and a separator for a polymer electrolyte fuel cell capable of achieving both control of water wettability and improvement of conductivity, a method for producing the same, and a polymer electrolyte fuel cell. An object to be solved is to provide a polymer electrolyte fuel cell employing a separator.

As a result of intensive studies by the present inventors for the purpose of solving the above problems, the following invention has been completed. That is, the solid polymer fuel cell separator of the present invention that solves the above problems is roughened by forming fine irregularities on at least a part of the electrode side surface of the solid polymer fuel cell. And a substrate formed from a conductive material;
A water wettability adjusting member that is made of a hydrophilic material or a hydrophobic material and is thicker than the convex portion of the concave and convex portion and is covered with the concave portion. In particular, it is desirable that at least a part of the surface of the convex portion is not covered with the water wettability adjusting member.

  As a material constituting the separator, there is no particular restriction on a conductive material (a material having conductivity. A general material can be adopted), and the hydrophilicity is controlled. The surface is roughened and selectively filled with a water wettability adjusting member that adjusts the hydrophilicity or hydrophobicity in the recesses of the irregularities generated by the roughening. It became possible to balance with sex. That is, the hydrophilicity or hydrophobicity of the surface is controlled by the water wettability adjusting member filled in the concave portion of the rough surface, and the conductivity is secured by the convex portion of the rough surface. Many of the water wettability adjusting members are insulative, and the conductivity is lowered by covering the surface with a water wettability adjusting member composed of an insulating material or a material having low conductivity. The water wettability adjusting member includes not only those that improve hydrophilicity but also those that lower (hydrophobize) hydrophilicity. In the present specification, among the water wettability adjusting members, those that improve hydrophilicity are called hydrophilic materials, and those that lower hydrophilicity are called hydrophobic materials.

  The polymer electrolyte fuel cell separator as described above can be easily manufactured by the following manufacturing method. That is, in the method for producing a polymer electrolyte fuel cell separator according to the present invention, at least a part of the surface facing the electrode side of the polymer electrolyte fuel cell is roughened with respect to a substrate formed of a conductive material. And a step of forming a water wettability adjusting member made of a hydrophilic material or a hydrophobic material on the roughened surface.

  In other words, after roughening the surface that is desired to be hydrophilic or hydrophobic with respect to the base material formed from the conductive material, the water wettability adjusting member is attached to or formed on the rough surface, thereby selectively forming the recess. Can be filled with a water wettability adjusting member. Here, it is desirable that the water wettability adjusting member is made into a solution or a suspension.

  A polymer electrolyte fuel cell that solves the above problems employs a polymer electrolyte fuel cell separator described above or a polymer electrolyte fuel cell separator manufactured by the above-described manufacturing method.

  By properly selecting the water wettability adjusting member, the polymer electrolyte fuel cell separator according to the present invention can achieve the desired degree of hydrophilicity or hydrophobicity and also form the water wettability adjusting member. A decrease in conductivity can also be suppressed, and sufficient conductivity can be secured.

  Accordingly, when selecting the material constituting the separator, the bulk properties and the hydrophilicity of the surface can be optimized independently, which facilitates material selection. That is, by selecting a material that can appropriately realize characteristics as a bulk and adopting the configuration of the present invention, the hydrophilicity or hydrophobicity of the surface can be made preferable. Since the range of material selection expands, it is also possible to select a high-purity material with a small amount of eluate that affects the battery reaction.

(1) Separator for polymer electrolyte fuel cell The polymer electrolyte fuel cell separator of the present invention will be described in detail below based on the embodiments. The separator for a polymer electrolyte fuel cell of this embodiment has a base material and a water wettability adjusting member.

  The base material is roughened by forming fine irregularities on at least a part of the electrode-side surface of the polymer electrolyte fuel cell, and is formed of a conductive material.

  Although the shape of a base material is not specifically limited, The shape generally employ | adopted as a separator for polymer electrolyte fuel cells can be taken. For example, a plate-like member having flow paths through which air, fuel gas, etc. flow is formed on both sides. Further, it may be formed with a flow path for flowing a temperature adjusting heat medium such as cooling water for controlling the temperature of the fuel cell. And it does not specifically limit as an electroconductive material which forms a base material, The material generally employ | adopted as a separator, such as a carbon material and a metal material, can be used.

  As a method for forming a separator from a carbon material, there are a method in which powder is sintered to form a sintered body, or a resin composite carbon compound mixed with a binder such as a resin material is compression molded or injection molded. As a method of forming a separator from a metal material, there are a method of sintering powder to form a sintered body, or a method of pressing. Both the carbon material and the metal material may be further formed with a flow path by machining. Here, an uneven part (rough surface), which will be described later, can also be formed together with compression before pressing, pressing, and post-processing.

  The electrode side of the substrate is roughened by forming fine irregularities at least partially. The portion to be roughened is applied to a portion for controlling hydrophilicity. For example, a part in contact with an electrode (anode or cathode) of an MEA (membrane electrode assembly) or an inner wall of a flow path. In particular, since the portion in contact with the electrode needs to realize high conductivity in addition to control of hydrophilicity or hydrophobicity, it is desirable to roughen the surface to control hydrophilicity or hydrophobicity.

  The concavo-convex portion only needs to have a size and shape such that a water wettability adjusting member described later can be filled in the recess. In that case, when it is desired to uniformly adjust the hydrophilicity or hydrophobicity of the surface, the size of the unevenness (the size when the unevenness is seen from the normal direction of the surface on which the rough surface is formed) is attached. By making the size sufficiently small compared to the size of the water droplets to be considered and the size of the flow path to be formed, the hydrophilicity and hydrophobicity for the water droplets can be made uniform. Further, the degree of filling of the water wettability adjusting member (strength of bonding between the water wettability adjusting member and the base material by the anchor effect) is determined by the depth and shape of the uneven portion.

  The surface roughness Ra of the rough surface on which the irregularities are formed is preferably 0.8 μm or more and 25 μm or less, and more preferably 1 μm or more and 10 μm or less. The greater the surface roughness, the more the wettability adjusting member can be coated, and the hydrophilicity or hydrophobicity control becomes easier. Various shapes such as a dot shape and a line shape can be adopted as the shape of the uneven portion.

  The method for forming the rough surface (uneven portion) is not particularly limited, but can be formed simultaneously with the formation of the base material of the base material, or can be formed simultaneously with the formation of the flow path or the like. A rough surface can also be formed by cutting and grinding such as shot blasting and milling.

  The water wettability adjusting member covers the uneven portion of the substrate. In particular, the concave portion is thicker than the convex portion. Here, it is desirable that the convexity is not covered with a water wettability adjusting member, and even if it is covered, it is desirable to form a very thin layer (for example, a monomolecular layer or a layer of 2 to 3 molecules). The electrical resistance can be lowered by eliminating the water wettability adjusting member covering the convex portion (or reducing the thickness). That is, the hydrophilicity or hydrophobicity of the surface is adjusted by the water wettability adjusting member that covers the concave portion, and the conductivity is ensured by the convex portion.

  The water wettability adjusting member may be a material for hydrophobizing (water repellency: reducing hydrophilicity) in addition to a material for hydrophilizing to improve hydrophilicity. Many water wettability adjusting members are insulating. For example, as a material for improving hydrophilicity, a material having a large surface energy can be mentioned. Specifically, a metal oxide represented by titanium oxide or an organosilicon compound having a perhydrosiloxane bond (for example, perhydropolysilazane). Examples thereof include silica glass obtained by glass conversion. The unevenness portion can be covered with the water wettability adjusting member by plasma hydrophilization treatment in a mixed atmosphere of fluorine gas and a substance containing a hydrophilic functional group. At present, as a particularly preferable degree of hydrophilicity and hydrophobicity, when making hydrophilic, the contact angle is preferably 0 ° or more and 80 ° or less, and more preferably 10 ° or more and 40 ° or less. When making it hydrophobic, the contact angle is desirably 90 ° or more.

  As a material for improving hydrophobicity, the surface to be treated is fluorinated in a fluorine gas atmosphere, or a silicon compound having a low surface energy (for example, silicone oil such as polydimethylsiloxane) containing methyl group, F group, etc. Can be mentioned.

  A method for controlling the thickness of the concave and convex portions covering the water wettability adjusting member by these methods will be described later in the manufacturing method.

(2) Method for Producing Solid Polymer Fuel Cell Separator A method for producing a solid polymer fuel cell separator of the present invention will be described below based on the embodiments. The manufacturing method of this embodiment is a method of manufacturing the polymer electrolyte fuel cell separator described in (1).

  The manufacturing method of this embodiment has a roughening process and a water wettability adjusting member forming process.

  The roughening step is a step of roughening the substrate. Roughening is forming fine irregularities. As a method for forming fine irregularities, a chemical method such as etching can be employed in addition to cutting and grinding machining such as shot blasting and milling. As the base material to which the present manufacturing method can be applied, the same ones as described above can be adopted, and further explanation is omitted. In addition, the concave and convex portions formed in this step can be the same as those described above, and thus description thereof is omitted.

  The water wettability adjusting member forming step is a step of covering the unevenness formed by the roughening step with the water wettability adjusting member. Here, the thickness covering the water wettability adjusting member is such that the concave portion of the concavo-convex portion is thicker than the convex portion. As a method for this, the water wettability adjusting member can be selectively thickened to the concave portion rather than the convex portion by coating and drying the water wettability adjusting member in a solution or suspension and then coating on the rough surface. . In this case, by performing application and drying in a state where the concave portion of the concave and convex portion is down, the water wettability adjusting member is more covered with the concave portion than the convex portion. The water wettability adjusting member may be a member that covers the recess by reacting. For example, after applying the above-mentioned organosilicon compound solution, it can be cured by heating and reaction.

  In addition, when a coating of a water wettability adjusting member is formed on a rough surface by an isotropic process such as a plasma treatment, a water wettability adjusting member coated on a convex part after forming a film having a uniform thickness once. By removing, the thickness of the coating of the convex portion can be made relatively small. When removing the water wettability adjusting member by a mechanical processing method, a method of removing from the convex portion (a method of selectively processing a contact portion such as milling, cutting, grinding, etc.) may be adopted. desirable. In that case, the protrusion after removing the coating of the water wettability adjusting member protrudes from the surface (or the same level) as the concave portion covered with the water wettability adjusting member, so that it contacts with the electrode. The resistance can be reduced without being hindered.

(3) The polymer electrolyte fuel cell of the present embodiment is the polymer electrolyte fuel cell separator described in (1) or the polymer electrolyte fuel cell separator manufactured by the method described in (2). Adopted.

  Specifically, general configurations other than the separator can be adopted. That is, a solid polymer fuel having a membrane electrode assembly comprising a solid polymer electrolyte membrane and a pair of electrodes that sandwich the solid polymer electrolyte membrane, and a pair of separators that sandwich the membrane electrode assembly It is a battery, The separator is the above-mentioned separator.

  Hereinafter, the polymer electrolyte fuel cell separator of the present invention will be described based on examples.

(Example 1 and Comparative Example 1)
As a material to be treated, the surface of a carbon plate (Tokai Carbon Co., Ltd .: G347B: size 50 × 50 × thickness 1.5) was milled to be roughened. The surface roughness of the roughened surface was finished to a central average roughness (Ra) of 1.50 μm (10-point average roughness Rz: 13.74 μm for reference). Only the roughened surface was treated as a hydrophilized untreated product (Comparative Example 1).

  A solution obtained by diluting perhydropolysilazane (Clariant: NPllO) as a precursor of a water wettability adjusting member 10-fold with xylene to this untreated product once at 150 ° C after dip coating (pulling speed 120 mm / min) The test sample of Example 1 was obtained by heat treatment for 1 hour and converting to silica glass.

  When the surface of the test sample of Example 1 is schematically explained, as shown in FIG. 1A, the surface of the base material 1 with the roughened surface and the uneven portions formed on the surface of the base material 1 are shown. And a water wettability adjusting member 2 coated (filled) in the recess. Since the recess is covered with the water wettability adjusting member 2, the desired hydrophilicity can be realized. And the water wettability adjusting member 2 is not coat | covered by the convex part, and the influence on the electroconductivity by the water wettability adjusting member 2 can be suppressed to the minimum. That is, the larger the area of the exposed protrusion P, the higher the conductivity, and the greater the area of the recess d covered by the water wettability adjusting member 2, the greater the hydrophilicity adjusting effect of the water wettability adjusting member.

  The center average roughness (Ra) of the surface of the test sample of Example 1 after being covered with the water wettability adjusting member was 1.47 μm (reference Rz: 13.11 μm). As a result of evaluating the hydrophilization characteristic of the rough surface of Example 1 by measuring the contact angle (θ), it was 36 °. The contact angle was measured with Kyowa Interface Science Co., Ltd. CA-A type.

Further, the electrical conductivity of the test sample of Example 1 was 35.5 × 10 ⁻⁵ mΩ as a resistance value. The electrical conductivity is measured by measuring the voltage when energized at 1 A / cm ² while applying a load of 1.96 MPa (20 kgf / cm ² ) with the electrodes made of dense carbon on top and bottom. Calculated as The test sample of Comparative Example 1 had a contact angle of 95 ° and a resistance value of 23.3 × 10 ⁻⁵ mΩ.

The durability of the test sample of Example 1 was evaluated. As a result of measuring the contact angle and the electrical conductivity after the test sample of Example 1 was immersed in warm water at 75 ° C. for 1000 hours, the contact angle was 32 °, the resistance value was 35.4 × 10 ⁻⁵ mΩ, and after durability There was no big change. Similarly, the contact angle and electrical conductivity were measured after the test sample of Example 1 was immersed in 1N sulfuric acid at 75 ° C. for 1000 hours. The contact angle was 33 ° and the resistance value was 34.6 × 10 ⁻⁵ mΩ. There was no significant change after endurance. That is, after roughening the separator surface, coating with a water wettability adjusting member allows the hydrophilicity to be controlled while maintaining high conductivity.

(Example 2)
Test prepared with the same material, composition and method as the test sample of Example 1 except that the ratio of diluting perhydropolysilazane (hydrophilic material) with xylene was 5 times and the number of dip coatings was 3 times. The sample was used as the test sample of Example 2. The center average roughness (Ra) of the test sample of Example 2 was 0.92 μm (reference Rz: 5.40 μm). The reason why the surface roughness is smaller than that of the test sample of Example 1 is presumed to be because it is covered with more water wettability adjusting members.

The contact angle of the test sample of Example 2 was 28 °, and the resistance value was 87.2 × 10 ⁻⁵ mΩ. And after 1000 hours endurance in 75 ° C. warm water, the contact angle is 25 °, the resistance is 90.0 × 10 ⁻⁵ mΩ, and after 1000 hours endurance in 1N sulfuric acid at 75 ° C., the contact angle is 27 °. The resistance value was 88.5 × 10 ⁻⁵ mΩ.

  That is, it can be considered that the surface of the test sample of Example 2 is as shown in FIG. The surface of the test sample of Example 2 has a larger area d ′ where the water wettability adjusting member 2 is exposed than the test sample of Example 1 as shown in FIG. The action of the wettability adjusting member 2 appears. As a result, the contact angle is considered to be smaller than that of the test sample of Example 1. However, since the area of the exposed convex part became small, it is thought that electroconductivity became smaller than the test sample of Example 1.

(Example 3)
A test sample prepared in the same material, configuration, and method as the test sample of Example 1 was used as the test sample of Example 3 except that shot blasting was adopted as a method for roughening the surface. The center average roughness (Ra) of the test sample of Example 3 before being covered with the water wettability adjusting member was 1.38 μm (reference Rz: 10.26 μm). The surface roughness was slightly smaller than milling. The center average roughness (Ra) of the test sample of Example 3 after being coated with the water wettability adjusting member was 1.12 μm (reference Rz: 9.77 μm).

The contact angle of the test sample of Example 3 was 31 °, and the resistance value was 48.0 × 10 ⁻⁵ mΩ. And after 1000 hours endurance in 75 ° C. warm water, the contact angle is 29 °, resistance value is 50.7 × 10 ⁻⁵ mΩ, and after 1000 hours endurance in 1N sulfuric acid at 75 ° C., the contact angle is 29 °. The resistance value was 49.3 × 10 ⁻⁵ mΩ.

Example 4
A test sample prepared in the same material, configuration, and method as the test sample of Example 1 was used as the test sample of Example 4 except that silicone oil was used as the water wettability adjusting member (hydrophobic material). Silicone oil was selected as a material that has low hydrophilicity (improves hydrophobicity). A solution obtained by diluting the water repellent methyl hydrogen silicone oil (GE Toshiba Silicone Co., Ltd .; TSF484) with xylene four times. Adopted as.

  The substrate is immersed in this solution, and dip coating is performed once (with a pulling rate of 120 mm / min) in the same manner as in Example 1. Thereafter, the solvent is removed at 70 ° C., and then heat treatment is performed at 150 ° C. for 1 hour. A hydrated layer was formed. The center average roughness (Ra) of the test sample of Example 4 was 1.39 μm (reference Rz: 12.70 μm).

The contact angle of the test sample of Example 4 was 131 °, and the resistance value was 42.7 × 10 ⁻⁵ mΩ. And after 1000 hours endurance in 75 ° C. warm water, the contact angle is 130 °, the resistance is 41.8 × 10 ⁻⁵ mΩ, and after 1000 hours endurance in 1N sulfuric acid at 75 ° C., the contact angle is 129 °. The resistance value was 49.3 × 10 ⁻⁵ mΩ.

  Even when a silicone oil that improves hydrophobicity is employed as the water wettability adjusting member, the hydrophobicity can be adjusted while maintaining the same conductivity as the member that improves hydrophilicity.

(Comparative Example 2)
A roughened substrate was used in the same manner as in Example 1. The surface of the base material was further polished with abrasive paper # 400-1200 until Ra became 0.6 μm to obtain a polished surface. This polished surface was visually a mirror surface. Thereafter, dip coating is performed once with a solution obtained by diluting the same hydrophilizing material as in Example 1 under the same conditions so that the unevenness of the finished polished surface is completely covered (with a lifting speed of 120 mm / min), and then 150 ° C., A test sample of Comparative Example 2 was obtained by converting to silica glass by heat treatment for 1 hour and uniformly coating the surface with a water wettability adjusting member. Even after coating, it was visually mirror-finished.

  The contact angle of the test sample of Comparative Example 2 was 11 °, and the resistance value was too high to be measured. And after 1000 hours endurance in 75 ° C hot water, contact angle is 8 ° After 1000 hours endurance in 1N sulfuric acid at 75 ° C, contact angle is 9 °, both of which are too high to measure Met.

(result)
As is clear from the above results, the test sample of this example was able to adjust the hydrophilicity of the surface while ensuring conductivity.

It is a schematic sectional drawing of the separator for polymer electrolyte fuel cells in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Water wettability adjustment member

Claims (9)

A substrate that is roughened by forming fine irregularities on at least a portion of the electrode-side surface of the polymer electrolyte fuel cell, and is formed of a conductive material;
A water wettability adjusting member comprising a hydrophilic material or a hydrophobic material, and having a concave portion thicker than the convex portion of the concave and convex portion; and
A separator for a polymer electrolyte fuel cell, comprising:   The solid polymer fuel cell separator according to claim 1, wherein at least a part of the surface of the convex portion is not covered with the water wettability adjusting member.   3. The polymer electrolyte fuel cell separator according to claim 1, wherein the roughened portion on the electrode side has a surface roughness Ra of 0.8 μm or more and 25 μm or less. The conductive material is a carbon material;
The separator for a polymer electrolyte fuel cell according to claim 1, wherein the water wettability adjusting member is perhydropolysilazane or silicone oil. A step of roughening at least a part of a surface facing the electrode side of the polymer electrolyte fuel cell with respect to a substrate formed of a conductive material;
Forming a water wettability adjusting member made of a hydrophilic material or a hydrophobic material on the roughened surface;
A method for producing a separator for a polymer electrolyte fuel cell, comprising:   The method for producing a polymer electrolyte fuel cell separator according to claim 5, wherein the water wettability adjusting member is made into a solution or a suspension.   The method for producing a separator for a polymer electrolyte fuel cell according to claim 5 or 6, wherein the surface roughness Ra of the roughened portion on the electrode side is 0.8 µm or more and 25 µm or less. The conductive material is a carbon material;
The method for producing a polymer electrolyte fuel cell separator according to any one of claims 5 to 7, wherein the water wettability adjusting member is perhydropolysilazane or silicone oil. A membrane electrode assembly comprising a solid polymer electrolyte membrane and a pair of electrodes sandwiching the solid polymer electrolyte membrane;
A polymer electrolyte fuel cell having a pair of separators sandwiching the membrane electrode assembly,
The separator is a polymer electrolyte fuel cell separator according to any one of claims 1 to 4 or a polymer electrolyte fuel cell separator produced by the production method according to any one of claims 5 to 7. A polymer electrolyte fuel cell characterized by being selected.

Images