KR101344216B1 - Polymer electrolyte membrane fuel cell separator using graphene and preparation method thereof - Google Patents

Abstract

In order to improve the corrosion resistance and contact resistance characteristics of a separator plate of a polymer electrolyte fuel cell (PEMFC), a polymer electrolyte fuel cell coated with graphene having high corrosion resistance and high conductivity on the substrate by an electrospray deposition method It relates to a plate and a method of manufacturing the same. According to the present invention, after forming a uniform graphene layer on the separator and stainless steel of the polymer electrolyte fuel cell having excellent corrosion resistance and interfacial contact resistance, no residue is left, so that environmental pollution does not occur, and the manufacturing process is simple and low cost. It is possible to provide a method for manufacturing a separator plate of a polymer electrolyte fuel cell that can be produced.

Description

Separation plate of polymer electrolyte fuel cell using graphene and its manufacturing method {POLYMER ELECTROLYTE MEMBRANE FUEL CELL SEPARATOR USING GRAPHENE AND PREPARATION METHOD THEREOF}

The present invention relates to a separator of a polymer electrolyte fuel cell using graphene and a method for manufacturing the same. More particularly, the present invention relates to high corrosion resistance and high resistance to improve the corrosion resistance and contact resistance characteristics of a separator of a polymer electrolyte fuel cell (PEMFC). The present invention relates to a separator for a polymer electrolyte fuel cell coated with graphene having conductive properties by electrospray deposition, and a method of manufacturing the same.

Fuel cell is a power generation device that converts chemical energy directly into electrical energy. Since it is more efficient and generates little pollution than existing power generation devices, many researches have been made as an alternative to solve the problems of global warming, environmental pollution, and exhaustion of energy resources. Is being done. Fuel cells are classified into alkaline fuel cells (AFC), polymer electrolyte fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), and solid oxide fuel cells (SOFC). Polymer electrolyte membrane fuel cell (PEMFC) is a fuel cell that uses a polymer membrane with hydrogen ion exchange as an electrolyte. It has higher efficiency, shorter startup time, and response to load changes compared to other types of fuel cells. This fast and pollution-free power generator is in the spotlight. It is a next generation power generation device that can be applied to distributed power generation, pollution-free automobile power source, mobile power source, spacecraft power source, and military power source.

However, currently produced PEMFC is difficult to commercialize due to problems such as high price and short lifespan, and research on materials and components is required to commercialize PEMFC. In particular, since a stack uses expensive materials, it is essential to develop components using inexpensive materials. Even in the stack, the separator takes up about 80% by weight and the price ratio is over 40%. Therefore, the development of a light and cheap separator is expected to have a large ripple effect on commercialization of fuel cells.

In addition to low cost, the properties required for use as separator materials include excellent processability, mechanical strength and high electrical conductivity, low density and low gas permeability, and chemical stability. Materials meeting these various requirements include carbon-polymer composite separators and stainless steel-based metal separators. Composite separators have excellent chemical stability but have poor mechanical properties.Metal separators have excellent processability, price, and mechanical strength, but they are exposed to corrosion for a long time due to the characteristics of PEMFC operating environment. In addition, the contact resistance increases rapidly by increasing the passivation film on the surface.

Meanwhile, graphene refers to a single layer of the multilayer plate-like structure of graphite, and has a thin layer structure of about 0.2 nm in which carbon atoms are intertwined in a honeycomb shape. Carbon-carbon bonds are structurally and chemically very stable because of the strong covalent bonds. It can be applied to nano electronic devices, gas sensors, thin film transistors, solar cells, fuel cells, energy storage devices, lubricants by applying excellent mechanical, chemical and electrical properties.

Korean Patent Laid-Open Publication No. 2010-0127677 relates to a separator plate for a fuel cell coated with graphene and a method of manufacturing the same, wherein the separator plate for a fuel cell is coated on a stainless steel substrate, at least one surface of the stainless steel substrate, and a buffer layer. Comprising a graphene layer, the manufacturing method thereof is a graphene-coated fuel cell, characterized in that it comprises the step of forming a nickel layer on the stainless steel substrate and the graphene layer by chemical vapor deposition on the nickel layer Disclosed is a separator and a method of manufacturing the same. As such, when graphene is formed using chemical vapor deposition, large area graphene may be manufactured and graphene layer number may be controlled according to reaction conditions, but it may be difficult to control uniform crystal surface.

In addition, Korean Patent Publication No. 2010-0121978 discloses a method of preparing a graphene thin film by preparing and dispersing a graphene dispersion by air spray deposition, but in the case of a pneumatic spray deposition method, coating is performed when the air pressure is not constant. The uniformity of is considerably inferior and it is difficult to obtain a uniform coating surface without the movement of the substrate or the nozzle. In particular, when the metal base material is used as a substrate, the adhesion to the substrate is reduced without the addition of a dispersant, and the coating surface may be easily dropped with only a slight physical force on the outside. In addition, organic solvents such as dimethylformamide, N-methylpyrrolidone, and dimethyl sulfoxide are harmful to humans and may cause environmental pollution.

The present inventors separated a polymer electrolyte fuel cell prepared by coating a graphene dispersion prepared by adding graphene and a conductive polymer to an alcohol solvent on a stainless steel of a metal separator plate by using an electrospray coating method. In the case of manufacturing the plate, there is less cohesion in the solution in which graphene is dispersed compared to the prior art, and thus the uniformity of the graphene coating is excellent. It has been found that the process is simple to form large area graphene thin films at low cost. In addition, the separator of the polymer electrolyte fuel cell manufactured according to the present invention was found to be excellent in corrosion resistance and interfacial contact resistance to complete the present invention.

An object of the present invention to provide a separator plate of a polymer electrolyte fuel cell excellent in corrosion resistance and interfacial contact resistance.

Another object of the present invention is to form a uniform graphene layer on the stainless steel after the residue does not remain environmental pollution does not occur, the manufacturing process of the separator plate of a polymer electrolyte fuel cell that can be manufactured at a low cost It is to provide a manufacturing method.

In order to achieve the above object, the present invention is a separator plate of a polymer electrolyte fuel cell in which a graphene layer is formed on stainless steel, wherein the graphene layer is electrosprayed on a graphene dispersion prepared by adding and mixing graphene with an alcohol solvent. It provides a separator plate of a polymer electrolyte fuel cell, characterized in that formed.

In addition, the present invention comprises the steps of preparing a graphene dispersion (step 1); Heating the stainless steel to which the graphene dispersion is to be electrosprayed (step 2); And it provides a method for producing a separator plate of a polymer electrolyte fuel cell comprising the step (step 3) of electrospraying the graphene dispersion on a heated stainless steel.

In one embodiment of the present invention, the graphene dispersion may be prepared by further adding a conductive polymer with graphene and then mixing them.

In the present invention, the conductive polymer may be polypyrrole, polyaniline, polythiophene, or the like, but is not limited thereto.

In one embodiment of the present invention, the graphene dispersion is prepared by adding 0.1 to 1 part by weight of graphene and 5 to 10 parts by weight of conductive polymer, mixing and stirring, and then ultrasonically treating the graphene dispersion with respect to 100 parts by weight of an alcohol solvent. can do.

Ethanol or ethyl ether may be used as the alcohol solvent.

In one embodiment of the present invention, in step 2, the stainless steel is heated to a temperature of 25 ~ 150 ℃, the graphene dispersion from the stainless steel to a nozzle of 10 to 20 kV at a height of 10 to 50 cm Applied to electrospray on stainless steel in an amount of 50 to 300 μl / min to form a graphene layer.

In one embodiment of the present invention, in step 3, the graphene dispersion is electrosprayed on a heated substrate to form a graphene thin film, and then it is preferable to further perform a step of heat treatment at 200 ~ 300 ℃.

According to the present invention, after forming a uniform graphene layer on the separator and stainless steel of the polymer electrolyte fuel cell having excellent corrosion resistance and interfacial contact resistance, no residue is left, so that environmental pollution does not occur, and the manufacturing process is simple and low cost. Provided is a method of manufacturing a separator of a polymer electrolyte fuel cell that can be manufactured.

1 is a FE-SEM photograph taken for the microstructure of the graphite and graphite oxide, graphene prepared in the embodiment.
Figure 2 is an XRD pattern measured for the microstructure of the graphite, graphite oxide, graphene prepared in Example.
Figure 3 is a SEM photograph taken on the surface and the cross-section to confirm the shape and thickness of the graphene layer electrospray deposited on the stainless steel surface in the embodiment.
Figure 4 is a graph showing the results of conducting a coin polarization test by simulating the corrosive atmosphere inside the stack to confirm the corrosion resistance of the graphene-coated stainless steel in the embodiment.
FIG. 5 is a graph showing the results of conducting a potentiometric polarization test at 0.1 V SCE, which is an oxidation potential of a hydrogen electrode, to confirm corrosion resistance of a graphene-coated stainless steel in the embodiment.
Figure 6 is a graph showing the results of conducting the potentiometric polarization test at 0.6V SCE of the reduction potential of the air electrode to confirm the corrosion resistance of the graphene-coated stainless steel in the embodiment.
7 is a schematic diagram of an apparatus for measuring the interfacial contact resistance of the graphene layer in Test Example 4 of the present invention.
Figure 8 is a graph showing the results of measuring the contact resistance between the surface while changing the compressive load for the stainless steel specimen before and after graphene coating in Test Example 4 of the present invention.

Hereinafter, a separator and a method of manufacturing the polymer electrolyte fuel cell according to the present invention will be described in detail.

First, a graphene dispersion is prepared (step 1).

In the present invention, the graphene dispersion is prepared by adding graphene to an alcohol solvent, mixing and stirring it, and performing an ultrasonic treatment to improve the dispersibility of graphene.

In one embodiment of the present invention, by preparing a graphene dispersion by adding a conductive polymer in the preparation of the graphene dispersion, the graphene layer not only improves the dispersibility of the graphene in the graphene dispersion by the conductive polymer It is possible to improve the adhesion between the stainless steel and the conductivity of the graphene layer.

The conductive polymer may be polypyrrole, polyaniline, polythiophene, or the like, but is not limited thereto.

In one embodiment of the present invention, the graphene dispersion is preferably prepared by mixing and stirring by adding 0.1 to 1 parts by weight of graphene and 5 to 10 parts by weight of the conductive polymer with respect to 100 parts by weight of the alcohol solvent.

The alcohol solvent may be ethanol or ethyl ether, but is not necessarily limited thereto.

In the present invention, it is prepared by adding dimethyl diethoxysilane as a dispersant to the graphene dispersion.

When preparing a graphene dispersion using ethanol, it is difficult to obtain a uniform coating layer because the dispersibility is easily precipitated and the amount of graphene in the spraying liquid is changed during long time electrospray deposition. Thus, by adding dimethyl diethoxysilane as a dispersant, a more uniform graphene coating layer can be obtained by preparing a graphene dispersion that has not been precipitated for a long time.

Dimethyldiethoxysilane as the dispersant is preferably included in the graphene dispersion in a volume ratio of 1: 1 with graphene in order to obtain a uniform graphene coating layer.

Next, the stainless steel to be sprayed with the graphene dispersion is heated (step 2).

In the present invention, before the graphene dispersion is prepared by electrospraying the graphene dispersion prepared as described above, the stainless steel to which the graphene dispersion is to be sprayed is heated to a temperature of 25 to 150 ° C.

Before preparing the graphene layer by the electrospray method as in step 2, after the graphene layer is prepared by heating the stainless steel to which the graphene dispersion is sprayed to a temperature of 25 to 150 ° C., no residual solvent remains. Affinity with stainless steel can be improved.

Finally, the graphene dispersion is electrosprayed onto heated stainless steel to produce a graphene layer (step 3).

As shown in FIG. 1, the graphene dispersion prepared in Step 1 is injected into an electrospray apparatus, and then the graphene dispersion is electrosprayed onto the heated stainless steel through the nozzle of the electrospray apparatus to prepare a graphene layer.

In one embodiment of the present invention, in the step of electrospraying the graphene dispersion through the nozzle of the electrospray device, the distance between the tip of the nozzle of the electrospray device and the stainless steel is preferably 10 to 50 cm, the electrospray device It is preferable that the graphene dispersion is electrosprayed on the stainless steel in an amount of 50 to 300 µl / min while a voltage of 10 to 20 kV is applied to the nozzle of.

In the case of electrospraying the graphene dispersion on the stainless steel according to the above-described conditions, the uniform graphene thin film is made large by reducing the aggregation of particles in the graphene dispersion due to the potential difference between the graphene dispersion and the stainless steel. Can be formed.

In one embodiment of the present invention, in step 3, the graphene dispersion is electrosprayed on the heated stainless steel to form a graphene layer, and then the step of heat treatment at 200 ~ 500 ℃ can be further performed.

After forming the graphene layer by electrospraying on the stainless steel as described above, by heat treatment at 200 ~ 500 ℃ to improve the adhesion between the substrate and the graphene layer can be removed after the process residue.

In addition, the present invention provides a separator plate of a polymer electrolyte fuel cell prepared according to the above-described method for producing a separator plate of a polymer electrolyte fuel cell.

Hereinafter, the present invention will be described in detail with reference to Examples and Experimental Examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

[ Example ]

Example  : Polymer electrolyte  Manufacture of Separator of Fuel Cell

(One) Grapina  Produce

It was prepared by applying a method of exfoliating the multilayer structure of graphite into a microlayer through chemical treatment. 1 g of graphite was added to 500 mL of a sulfuric acid / nitric acid solution (V: V = 2: 1), followed by stirring at 0 ° C. for 24 hours. Thereafter, 11 g of potassium chlorate (KClO ₃ ) was added slowly so that the temperature inside the graphite-acid mixture liquid did not exceed 20 ° C. After addition of potassium chlorate, the mixture was stirred at room temperature for 72 hours. After the reaction, the mixture was neutralized to pH 6.5 by adding distilled water, and then washed and filtered several times using a filter, followed by vacuum drying at 80 ° C. The graphite produced in this way is called graphite oxide, and the completely dried graphite oxide was heat-treated at 1100 ° C. for 5 minutes in an argon atmosphere, and black and light exfoliated graphite, that is, heat-treated graphite oxide, that is, Graphene was prepared.

(2) by electrospray deposition Graphene  formation

35 mg of graphene was added to 500 mL of ethanol solvent. Thereafter, dimethyldiethoxysilane was added at a ratio of graphene and buffy 1: 1, and then dispersed in an ultrasonic bath for 24 hours. Electrospray deposition was applied to a 500 × 500 mm stainless steel (STS 316L) substrate using a graphene dispersed solution prepared previously. A total of 10 mL of graphene dispersed solution was sprayed at a spray rate of 200 μL per minute, and the graphene dispersion was spread evenly by applying a voltage of 10 to 15 kV, and the temperature of stainless steel was maintained at 100 ° C. Pin aggregation was prevented. The distance between the stainless steel and the spray nozzle was maintained at 30 cm, heat treatment was performed at 500 ℃ for 5 minutes after the coating was completed.

Test Example  One - Grapina  Property evaluation

Structural analysis of the graphite, graphite oxide, and graphene prepared in the example was performed using FE-SEM (Quanta, FEG model, 15kV) and X-ray diffractometer (PANalytical X'pert Pro MPD, CuK _α ). FE-SEM was measured for the microstructures of graphite, graphite oxide, and graphene before chemical treatment, respectively, and are shown in FIGS. 1A to 1D, respectively. The XRD pattern was measured and shown in FIG. 2.

Referring to Figure 1, the graphite before the chemical treatment (Fig. 1 (a)) was confirmed the characteristic multilayer (layer) structure of the graphite. In graphite oxide (FIG. 1 (b)), in the sulfuric acid / nitric acid mixture, the layer-layer breakdown occurred through chemical treatment, and the layer structure was destroyed more than the initial stage, and the distance between layers was also increased. When the graphite oxide was heat-treated (FIG. 1 (c)), it was confirmed that the distance between layers was significantly increased. In the case of Figure 1 (d), it was confirmed by the SEM image of the graphene to form the graphene structure of the microlayer without forming a complete single layer of graphene. This phenomenon is caused by the expansion of the layer-layer by the carbon dioxide generated by the reaction of potassium chlorate with functional groups (carboxyl groups, hydroxyl groups, etc.) formed in each layer of graphite during acid treatment, thereby destroying weak van der Waals bonds. It is reported to form a pin.

Referring to Figure 2, as confirmed in the previous studies (DA Nguyen, YR Lee, AV Raghu1, HM Jeong, CM Shin, BK Kim Polym Int 58 (2009) 412-417) of the initial graphite at 2θ = 26.5 ° The reflective surface of (002) corresponding to the interlayered spacing could be confirmed. After the acid treatment, the peak intensity of the (002) reflecting surface was greatly reduced, and a new peak was confirmed at 2θ = 12 °. Finally, in the exfoliated graphite after heat treatment, a fine XRD diffraction pattern was confirmed. The reason why the XRD pattern is formed can be explained through the Bragg's Law (nλ = 2dsinθ). According to the Bragg law, the interplanar distance d and the incident angle θ are inversely proportional. As confirmed in the SEM image, the XRD characteristic peak in the graphite oxide moved to around 12 ° as the interplanar distance of the initial graphite increased after acid treatment, and the exfoliated graphite after the acid treatment did not have a layer-layer distance. Or because the distance of the layer is very fine, it is confirmed that the XRD characteristic peak is weak. Through this, it was confirmed that the interlayer distance of graphite can be increased through acid treatment, and it was confirmed that the exfoliated graphite can be synthesized through heat treatment. As a result of the structural analysis as described above, in the case of the exfoliated graphite produced in the present study it was confirmed that a single layer of graphene could not be formed, and a fine layer of graphene flakes was produced.

Test Example  2 - Graphene SEM  analysis

In order to confirm the shape and thickness of the graphene layer electrospray deposited on the surface of the stainless steel in the embodiment, the SEM and photographs of the surface and the cross section are taken in FIG. 3. 3, (a) and (b) of Figure 3 shows the shape of the graphene of the stainless steel surface through which it can be confirmed that the graphene is uniformly coated throughout the surface. Figure 3 (c) and (d) shows the cross section of the graphene-coated stainless steel, when referring to this 10 mL graphene solution, the thickness was confirmed to be about 3 ~ 5 μm.

Test Example  3 - Graphene Corrosion resistance  Measure

In order to confirm the graphene layer electrospray deposited on the stainless steel surface in the Example, a coin ^- coated, potentiostatic polarization experiment was performed in a 1M H ₂ SO ₄ + 2ppm F ^- solution at 80 ℃ simulating the corrosive atmosphere inside the stack. Potensiostat (Princeton Applied Research, VersaSTAT4) equipment was used for corrosion resistance evaluation, and a standard caromel electrod (SCE) was used as a reference electrode and platinum was used as a counter electrode. In the case of the polarization test, the measurement speed was performed at 100 mV / s. In order to confirm the corrosion resistance of the graphene-coated stainless steel, it is shown in Figure 4 by performing a polarization test to simulate the corrosive atmosphere inside the stack. To compare the corrosion resistance, the results of the stainless steel without graphene coating are also shown.

In addition, since the separation plate in the stack is continuously maintained at the oxidation potential of the hydrogen electrode and the reduction potential of the air electrode, as shown in FIG. 5 and FIG. 6, the polarization test of the graphene-coated stainless steel and the stainless steel field is not performed.

In the evaluation of corrosion resistance of PEMFC separator material, considering the actual operating conditions, the polarization of the anode is 0.1V NHE (normal hydrogen electrode) and the cathode is placed at the 0.6V NHE potential region. And corrosion resistance evaluation of the separator material of the cathode is evaluated by the current density value at 0.1V NHE and 0.6V NHE. The U.S. Department of Energy (DOE) sets the target value for corrosion resistance of separator materials to 1 μA / cm ² or less in each potential region (CL Lee and CN Yang, Machine and Material., 21, 24 (2009)). .

Referring to FIG. 4, a graphene-coated stainless steel and a non-stainless stainless steel in consideration of polarization of a hydrogen electrode and an air electrode during operation of a fuel cell have a current density of about 0.49 μA / cm in an oxidation potential region (0.1 V NHE). ² and 0.265 μA / cm ² and 5.15 μA / cm ² in the cathode potential region (0.8415 V NHE), respectively. Since graphene was coated, the corrosion current density appeared to be reduced by about five times.

Referring to FIG. 5, which shows the results of an electrostatic potential polarization test at 0.1 V SCE, which is an oxidation potential of a hydrogen electrode, when an initial potential is applied to a specimen, graphene-coated stainless steel is stabilized by rapidly decreasing current density. However, uncoated stainless steel continues to decrease with time. Referring to FIG. 6, which shows the results of an electrostatic potential polarization test at 0.6 V SCE, which is a reduction potential of an air electrode, in the case of graphene-coated stainless steel, when the initial potential is applied to the specimen similarly to the oxidation potential, the current density decreases immediately after stabilization. However, the graphene-coated stainless steel tends to have a slightly higher current density and decrease in current density over time. Comparing the electrostatic potential polarization data of FIGS. 5 and 6, it can be seen that the corrosion current density value of the stainless steel is larger in the air electrode than in the hydrogen electrode. The hydrogen electrode satisfies the DOE separator corrosion resistance target value of 1 μA / cm ² without the graphene coating layer, but the cathode satisfies the DOE target value only for the graphene coated stainless steel. This confirms that the corrosion is continuously progressing when the stainless steel is exposed to the corrosive environment for a long time, it can be seen that it is helpful to improve the corrosion resistance when coated with graphene.

Test Example  4 - Graphene Interfacial contact resistance  Measure

The interfacial contact resistance was applied to the gas diffusion layer while applying pressure with reference to the apparatus shown in FIG. 7 and to the method established by Wang (H. Wang, MA Sweikart, J. Turner, Journal of Power Sources, 115 (2003) 243.). The resistance change of the used carbon paper (TP-060S carbon paper, Toray) and the surface modified layer was measured (N. Cunningham, M. Lef, G. Lebrun, J.-P. Dodelet, Journal of power Sources, 143 (2005) ) 93). The interfacial contact resistance (ICR) values of the graphene-coated stainless steel and the non-stainless stainless steel were measured and compared. Since the current generated in the unit cell inside the stack is supplied to the external circuit through the separator in contact with the electrode, the lower the contact resistance between the electrode and the separator is, the more efficient the fuel cell is. Metal-based separator plates are usually fastened in a stack at a pressure of 100-150 N / cm ^2. FIG. 8 shows the results of measuring interfacial contact resistance while varying the compressive load of stainless steel specimens before and after graphene coating. As the compressive load increases, the resistance decreases, and the resistance value of the graphene-coated and non-graphene specimens is 52 mΩ / cm ² and 319 mΩ / cm at 150 N / cm ² during the highest compressive load. ² showed a six-fold difference.

Claims (18)

A separator plate of a polymer electrolyte fuel cell having a graphene layer formed on stainless steel, wherein the graphene layer is electrosprayed a graphene dispersion in which 0.1-1 part by weight of graphene and 5-10 parts by weight of conductive polymer are added to 100 parts by weight of an alcohol solvent. Separation plate of a polymer electrolyte fuel cell, characterized in that formed by.
delete The method according to claim 1,
The graphene dispersion is a separator of a polymer electrolyte fuel cell, characterized in that the graphene and the conductive polymer is added to the alcohol solvent, mixed and stirred, and then prepared by ultrasonication.
The method according to claim 1,
The alcohol solvent is a separator of a polymer electrolyte fuel cell, characterized in that ethanol or ethyl ether.
The method according to claim 1,
The conductive polymer is polypyrrole (polypyrrole), polyaniline (polyaniline), polythiophene (polythiophene) is a separator of a polymer electrolyte fuel cell, characterized in that selected from the group consisting of.
The method according to claim 1,
Separation plate of the polymer electrolyte fuel cell, characterized in that the graphene dispersion further comprises a 1: 1 volume ratio of dimethyl diethoxysilane as graphene as a dispersant.
The method according to claim 1,
The graphene is a separator plate of a polymer electrolyte fuel cell, characterized in that the coating layer of a uniform thickness of 3 ~ 5 ㎛.
The method according to claim 1,
The graphene layer is a polymer electrolyte, characterized in that the graphene dispersion is formed by electrospraying on the substrate in an amount of 50 to 300 μl / min by applying a voltage of 10 to 20 kV to the nozzle at a height of 10 to 50 cm from stainless steel Separator of fuel cell.
The method according to claim 8,
Separation plate of the polymer electrolyte fuel cell, characterized in that the graphene layer formed by electrospraying the graphene dispersion in the stainless steel is heat-treated at 200 ~ 300 ℃.
Preparing a graphene dispersion by adding 0.1 to 1 part by weight of graphene and 5 to 10 parts by weight of a conductive polymer to 100 parts by weight of an alcohol solvent (step 1);
Heating the stainless steel to which the graphene dispersion is to be electrosprayed (step 2); And
Electrospraying the graphene dispersion onto a heated stainless steel (step 3);
Method of manufacturing a separator plate of a polymer electrolyte fuel cell comprising a.
delete The method of claim 10,
The graphene dispersion is a method of manufacturing a separator plate of a polymer electrolyte fuel cell, characterized in that the graphene and the conductive polymer is added to the alcohol solvent, mixed and stirred, and then ultrasonically treated.
The method of claim 10,
The alcohol solvent is a method of manufacturing a separator of a polymer electrolyte fuel cell, characterized in that ethanol or ethyl ether.
The method of claim 10,
The conductive polymer is polypyrrole, polyaniline and polythiophene method for producing a separator plate of a polymer electrolyte fuel cell, characterized in that selected from the group consisting of.
The method of claim 10,
The graphene dispersion is a method for producing a separator of a polymer electrolyte fuel cell, characterized in that dimethyl diethoxysilane as a dispersant is further included in graphene and 1: 1 volume ratio.
The method of claim 10,
Stainless steel in step 2 is a method of manufacturing a separator plate of a polymer electrolyte fuel cell, characterized in that heated to a temperature of 25 ~ 150 ℃.
The method of claim 10,
In the step 3, the graphene dispersion is electrosprayed on the stainless steel in an amount of 50 to 300 μl / min by applying a voltage of 10 to 20 kV to the nozzle at a height of 10 to 50 cm from the stainless steel Method for manufacturing a separator plate of an electrolyte fuel cell.
The method of claim 10,
After forming the graphene thin film by electrospraying the graphene dispersion liquid on the heated substrate in the step 3, and further comprising a heat treatment at 200 ~ 300 ℃ method of manufacturing a separator of a polymer electrolyte fuel cell .

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