JP3898707B2 - Manufacturing method of fuel cell membrane electrode assembly manufactured by printing process - Google Patents

Description

  The present invention relates to a method of manufacturing a fuel cell membrane electrode assembly, and more particularly, to a method of manufacturing a fuel cell membrane electrode assembly using a printing technique, during a general spray coating process of an ion exchange membrane and a bipolar catalyst layer. It relates to a method for overcoming expansion and cracking problems.

  A fuel cell is a device that generates electric power by directly using hydrogen-containing fuel and air by an electrochemical reaction. Since fuel cells have advantages such as low pollution, high efficiency, and high energy density, they have recently been the subject of research and development and recommendations in various countries.

  The structure of a fuel cell is generally composed of a basic structure having a plurality of layers. The intermediate layer is an ion exchange membrane that transmits ions, and both sides of the ion exchange membrane serve as catalyst layers, and the electrochemical reaction between the anode and the cathode is carried out in the catalyst layer. The outside of the two catalyst layers is a gas diffusion layer, most of which is made of carbon paper or carbon cloth material with good drainage, and the anode and cathode reactants are more catalytic reaction layers than the two diffusion layers. The product is also diffused and discharged through these two layers. The outer side of the two diffusion layers is a flow guide plate, most of which is formed by processing a carbon plate, a metal plate or a composite graphite fiber plate, and a gas flow guide groove is provided on the side adjacent to the diffusion layer. And the reactants and products of the cathode enter and exit the fuel cell through the two-layer flow guide plate. A battery unit is formed by the basic structure of the fuel cell described above.

  FIG. 1 is a side view of a typical ion exchange membrane fuel cell unit. The fuel cell unit 1 includes a membrane electrode assembly (MEA), which includes an ion exchange membrane 11, an anode catalyst layer 12, and a cathode catalyst layer 13. The anode of the membrane electrode assembly 10 includes an anode gas diffusion layer 2 and an anode current plate 3, and the cathode of the membrane electrode assembly includes a cathode gas diffusion layer 4 and a cathode current plate 5.

  As shown in FIG. 2, during actual application, the fuel cell set 100 includes a plurality of fuel cell units 1 coupled together, and an anode current collector plate 61, an anode end plate 62, a cathode current collector plate 63, and a cathode end plate 64. , And a plurality of seal packings and fixing parts. In addition, an air inlet 71 a and an air outlet 71 b are provided outside the anode end plate 62 in the practical fuel cell set 100 and used for supplying oxygen gas necessary for the reaction of the fuel cell set 100. A hydrogen gas inlet 72 a and a hydrogen gas outlet 72 b are further provided outside the anode end plate 62 and are used for supplying hydrogen gas necessary for the reaction of the fuel cell set 100. A coolant inlet 73a and a coolant outlet 73b are further provided outside the anode end plate 62, so that the fuel cell set 100 can be operated at an appropriate temperature.

  In the ion exchange membrane fuel cell composition described above, the membrane electrode assembly is the most important part of the entire fuel cell set, and the anode catalyst layer and the cathode catalyst layer are uniformly formed on both sides of the ion exchange membrane. Whether or not the membrane electrode assembly can exert application performance is the key. When manufacturing a membrane electrode assembly, the design of the manufacturing process is also very important because the material is relatively fragile and the material cost is high.

  Among various well-known membrane electrode assembly manufacturing methods, some of the manufacturing methods are not ideal in terms of process stability, and the phenomenon of localized overlapping coating is likely to occur in the spray coating process of the catalyst agent. The phenomenon that it is difficult to grasp and the thickness becomes non-uniform occurs, so that the local thickness error of the catalyst layer of the manufactured membrane electrode assembly becomes large and the control of the thickness and area is not easy. Have. Some known manufacturing methods also achieve relatively good quality, but are incompatible with automated production and have low industrial applicability.

  Further, in the catalyst agent spray coating process of the membrane electrode assembly, the ion exchange membrane absorbs the solvent in the catalyst agent after the catalyst agent spray coating and causes a swelling phenomenon, which causes a crack in the catalyst layer. There's a problem.

  Various techniques have been studied to produce membrane electrode assemblies with good characteristics and to overcome the problem of expansion cracks that occur in the catalyst agent. For example, Patent Document 1 describes a method for producing a fuel cell in which an ion exchange membrane is treated with a solvent, and overcomes the problem of being easily deformed during polymer membrane coating. According to the method employed, the ion exchange membrane is first immersed in a solvent, or pre-expansion treatment of the ion exchange membrane is first performed using a solvent such as alcohol to sufficiently expand the ion exchange membrane. Next, the catalyst slurry is uniformly applied to the surface of the ion exchange membrane, and at this time, the polymer membrane is not deformed. Further, the catalyst slurry is baked to uniformly shrink the ion exchange membrane, and the polymer membrane after coating is uniformly shrunk during baking to obtain a good membrane electrode assembly product. Finally, an ion exchange membrane coated with a catalyst layer is sandwiched between two diffusion layers, and heat-pressed to complete a fuel cell membrane electrode assembly.

  Patent Document 2 describes a fuel cell manufacturing method in which an ion exchange membrane is treated with a solvent. According to the method, an electrolyte membrane of a fuel cell is expanded with a solvent such as alcohols, and then further a catalyst slurry. The membrane electrode assembly of the fuel cell is completed by spray-coating the electrolyte membrane on both surfaces and sandwiching the electrolyte membrane coated with the catalyst layer between the two diffusion layers and baking with heat and pressure. In this well-known technique, two-step immersion with two different alcohol solvents is further performed to complete the expansion treatment of the electrolyte membrane. According to this, first, after being immersed in a highly volatile monoalcohol solvent for a certain period of time. Soak in low volatile polyhydric alcohol. Among them, the highly volatile monoalcohol is methanol, ethanol, acetone or a mixture thereof, and the low volatile polyalcohol is ethylene glycol, propylene glycol, butylene glycol, glycerin or a mixture thereof.

  However, these known techniques have not been effectively improved against the problems of expansion and cracking that are effectively generated by the catalyst of the membrane electrode assembly. In addition, when the technology is adopted, the ion exchange membrane is pre-expanded with various kinds of alcohol solvents and is not easy in terms of quality control, and the manufacturing method cannot be said to have industrial utility value.

Taiwan Patent Notice 447160 Specification Taiwan Patent Publication No. 529195 Specification

  A main object of the present invention is to provide a novel manufacturing method of a fuel cell membrane electrode assembly manufactured by a printing process.

  Another object of the present invention is to provide a stable manufacturing method of a fuel cell membrane electrode assembly, in the manufacturing process of the entire membrane electrode assembly, to reduce the local thickness error of the catalyst layer of the membrane electrode assembly, and to increase the thickness. It is to facilitate the control of the area.

  It is another object of the present invention to provide a manufacturing method that is compatible with automated production of fuel cell membrane electrode assemblies so that the catalyst layer coating of membrane electrode assemblies can be applied to automated production systems.

  Still another object of the present invention is to provide a manufacturing method capable of effectively improving the expansion and cracking phenomenon that occurs when coating a catalyst layer of a membrane electrode assembly, and to provide a good product quality of the membrane electrode assembly. There is.

The invention of claim 1 is a method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.
(A) preparing an ion exchange membrane, an anode catalyst agent and a cathode catalyst agent solution;
(B) positioning the ion exchange membrane cut to a required area on a thin plate substrate, and further placing the thin plate substrate on a screen printing table;
(C) fixing the selected printing plate material to the screen fixing frame of the screen printing stand;
(D) A step of uniformly coating the printing plate material pattern on the catalyst agent with a squeegee, and printing the catalyst agent on the printing plate material pattern on an ion exchange membrane on the thin plate substrate,
(E) a step of placing the ion exchange membrane on a heating plate after completion of screen printing and heating to recover the ion exchange membrane to form a uniform catalyst layer on the ion exchange membrane;
A manufacturing method of a fuel cell membrane electrode assembly manufactured by a printing process, characterized by comprising the above processes.
The invention of claim 2 is a method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, further comprising a step of cleaning the ion exchange membrane during the step (a). In this method, the fuel cell membrane electrode assembly is manufactured by a printing process.
Invention of Claim 3 is a manufacturing method of the fuel cell membrane electrode assembly manufactured by the printing process of Claim 2, In the said washing | cleaning process,
(A) washing the ion exchange membrane in pure water at 80 degrees Celsius for 1 hour;
(B) a step of washing in a 1 volume molar hydrogen peroxide aqueous solution at 80 degrees Celsius for 1 hour;
(C) a step of washing in pure water at 80 degrees Celsius for 1 hour;
(D) a step of leaving in 1 M sulfuric acid at 80 degrees Celsius;
(E) A step of washing 2-3 times with pure water at 80 degrees Celsius,
A manufacturing method of a fuel cell membrane electrode assembly manufactured by a printing process, characterized by comprising the above processes.
According to a fourth aspect of the present invention, in the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing step according to the first aspect, the step of printing an anode catalyst agent on the anode side of the ion exchange membrane and heating is performed, and then the ion A method for producing a fuel cell membrane electrode assembly produced in a printing process is characterized in that a step of printing and heating a cathode catalyst agent on the cathode side of the exchange membrane is performed.
According to a fifth aspect of the present invention, in the method of manufacturing a fuel cell membrane electrode assembly manufactured in the printing step according to the first aspect, the step of printing a cathode catalyst agent on the cathode side of the ion exchange membrane and heating is performed, A method for producing a fuel cell membrane electrode assembly produced in a printing process is characterized in that an anode catalyst agent is printed on the anode side of the exchange membrane and heated.
According to a sixth aspect of the present invention, in the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to the first aspect, the cathode catalyst agent is printed on the cathode side of the ion exchange membrane and the anode catalyst agent is printed on the anode side simultaneously. The method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process is characterized by performing a heating process.
The invention of claim 7 is the method for producing a fuel cell membrane electrode assembly produced in the printing process according to claim 1, wherein the anode catalyst agent prepared in the step (a) contains Pt-Ru-C, The catalyst agent contains Pt—C, and is a method for manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.
The invention of claim 8 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 7, wherein the preparation of the anode catalyst agent is:
(A) using a 2: 1: 2 weight ratio of Pt—Ru—C nanocatalyst particles to formulate 1 gram in a container;
(B) adding 4-8 milliliters of Nafion Solution;
(C) a step of producing an anode catalyst agent by ultrasonic vibration or high-speed stirring of the prepared anode catalyst material;
A method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.
The invention according to claim 9 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 7, wherein the prepared anode catalyst material is further stirred at a high speed to produce a uniform anode catalyst agent. And a manufacturing method of a fuel cell membrane electrode assembly manufactured in a printing process.
The invention of claim 10 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 7, wherein the preparation of the cathode catalyst agent comprises:
(A) using Pt—C nanocatalyst particles with a weight ratio of 1: 1 to prepare 1 gram in a container;
(B) adding 4-8 milliliters of Nafion Solution;
(C) a step of producing a cathode catalyst agent by ultrasonically vibrating the prepared cathode catalyst material;
A manufacturing method of a fuel cell membrane electrode assembly manufactured by a printing process, characterized by comprising the above processes.
The invention according to claim 11 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 10, wherein the prepared cathode catalyst material is further stirred at a high speed to produce a uniform cathode catalyst agent. And a manufacturing method of a fuel cell membrane electrode assembly manufactured in a printing process.
The invention of claim 12 is the method of manufacturing a fuel cell membrane electrode assembly manufactured in the printing process according to claim 1, wherein the anode catalyst agent prepared in the process (a) contains Pt-C, The method for producing a fuel cell membrane electrode assembly produced by a printing process is characterized in that the catalyst agent also contains Pt-C.
According to a thirteenth aspect of the present invention, in the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing step according to the first aspect, during the step (e), the temperature when the ion exchange membrane is placed on the heating plate and heated is The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process is characterized in that the temperature is 70 to 80 degrees Celsius and the time is 1 to 5 minutes.
The invention of claim 14 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein after the step ( e ), the ion-exchange membrane that has already undergone the screen printing process is placed in a hot press. And a method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, comprising a step of hot-pressing.
According to a fifteenth aspect of the present invention, in the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to the fourteenth aspect, when the ion exchange membrane is hot-pressed, the pressure received by the ion exchange membrane is 20 to 100 kgf / cm. ^{2. The} temperature is 110 to 140 degrees Celsius, and the time is 1 to 3 minutes. This is a method for manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.
According to a sixteenth aspect of the present invention, there is provided a method for manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to the fifteenth aspect of the present invention on both the positive and negative sides of an ion exchange membrane that has an anode catalyst layer and a cathode catalyst layer and is already hot-pressed. A method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, further comprising the step of placing a diffusion layer carbon cloth cut into a required area to form an anode gas diffusion layer and a cathode gas diffusion layer It is said.
The invention of claim 17 is the method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein the printing plate material is a screen having a mesh diameter and a mesh. This is a method of manufacturing a fuel cell membrane electrode assembly to be manufactured.
The invention according to claim 18 is the method of manufacturing a fuel cell membrane electrode assembly manufactured in the printing process according to claim 1, wherein the printing plate is a steel plate having a transition width and a gap. This is a method of manufacturing a fuel cell membrane electrode assembly to be manufactured.

The membrane electrode assembly manufactured by the fuel cell manufacturing method of the present invention has the following advantages.
(1) The process is stable.
The present invention uses a screen printing process when forming the catalyst layer on the ion exchange membrane, the squeegee used is uniform and the pores are uniform, and the fixed thickness catalyst agent can be printed on the ion exchange membrane, Therefore, local thickness error is small, control of thickness and area is easy, local spray coating in the well-known spray coating technology easily occurs, process time is difficult to grasp, and thickness is uneven. Does not occur.
(2) Applied to automated production.
The screen printing machine uses an appropriate concentration of catalyst layer with different mesh diameter and mesh number screen or steel plate with appropriate transition width and gap, and can control the catalyst layer content and printing thickness, and can be applied to automated production system it can.
(3) It is effective in solving the phenomenon of expansion and cracking of the anode catalyst layer of the ion exchange membrane.
During the process of the present invention, after the anode catalyst agent is printed on the ion exchange membrane, the ion exchange membrane is heated, and the organic solvent that can be absorbed by the ion exchange membrane is volatilized by heating the ion exchange membrane, and the catalyst agent itself is heated. When the anode catalyst layer of the ion exchange membrane is heat-treated with a heating plate, only a slight expansion deformation occurs, and it gradually recovers to a flat state and does not cause a cracking phenomenon. Quality is good.

  According to the technical means employed in order to solve the known technical problems of the present invention, an ion exchange membrane cleaning step and an anode catalyst agent solution and cathode catalyst agent solution preparation step are first executed. After the cleaning, the ion exchange membrane cut to an appropriate size is positioned on the thin plate substrate, and the thin plate substrate is placed on the screen printing stand. The selected printing plate material (for example, a screen having an appropriate mesh diameter and mesh or a steel plate having an appropriate transition width and gap) is fixed to the screen fixing frame of the screen printing stand. The printing agent material pattern is evenly coated on the catalyst agent that has been prepared with a squeegee, and the catalyst agent coated with the printing plate material pattern is further printed on an ion exchange membrane placed on a thin plate substrate. After the screen printing is completed, the ion exchange membrane is placed on a heating plate and heated from 70 degrees Celsius to 80 degrees Celsius to restore the ion exchange membrane flat and form a uniform catalyst layer on the ion exchange membrane.

  According to a preferred embodiment of the present invention, after the hot pressing process is performed on the completed ion exchange membrane, a diffusion layer carbon cloth cut to an appropriate size is placed on the catalyst layers on both the opposite sides of the ion exchange membrane and the anode. It becomes a gas diffusion layer and a cathode gas diffusion layer.

  With the technology adopted by the present invention, the catalyst layer coated on the ion exchange membrane of the membrane electrode assembly has a uniform thickness, small local thickness error, easy thickness and area control, and uniform pores. In the well-known spray coating technique, it is easy to cause local overlapping spray coating, and it is not easy to grasp the process time and solves the problem of uneven thickness. According to the production method of the present invention, when heat-treating the ion exchange membrane and the anode catalyst layer, it may have a slight expansion phenomenon, but it recovers to a flat surface and does not generate a crack phenomenon, so the product is good. Quality. Furthermore, the technology of the present invention is compatible with automated production and provides industrial utility value.

Prior to the membrane electrode assembly manufacturing process of the present invention, it is necessary to perform an ion exchange membrane cleaning step and a preparation step for an anode catalyst solution and a cathode catalyst solution.
FIG. 3 is a flowchart of the ion exchange membrane cleaning process of the present invention. First, an ion exchange membrane is prepared (step 101). As the ion exchange membrane, Nafion manufactured by Du Pont can be used. Preferably, the present invention uses a Nafion 117 ion exchange membrane having a thickness of 175 μm in consideration of the poisoning problem of the anode catalyst layer Pt (platinum) due to methanol permeability.

  Subsequently, a cleaning process is performed on the ion exchange membrane prepared as described above. In the present invention, in the cleaning step, the ion exchange membrane is cleaned in pure water at 80 degrees Celsius for one hour (step 102). Further, it is washed for one hour in an aqueous hydrogen peroxide solution having a volume concentration (M) of 80 degrees Celsius (step 103). Further, it is washed in pure water at 80 degrees Celsius for 1 hour (step 104). Further, it is left in 1 M sulfuric acid at 80 degrees Celsius (step 105). Finally, it is washed 2-3 times with pure water at 80 degrees Celsius (Step 106).

  The ion exchange membrane that has been cleaned in the above-described cleaning step is dried at room temperature (step 107).

  FIG. 4 is a flowchart of manufacturing the catalyst agent solution of the present invention. In this flow, first, a catalyst agent production material is prepared (step 201). According to a preferred embodiment of the present invention, when applied in a DMFC fuel cell system, the main production materials for the catalyst agent are Nafion Solution Se 5112 from DuPont and Pt-Ru / from Johnson Matthey. C is the main production material for the anode catalyst, and Pt-C is used for the cathode catalyst. When the technology of the present invention is applied to a PEMFC fuel cell system, the anode catalyst used is assumed to contain Pt—C, and the cathode catalyst is assumed to contain Pt—C.

  Then, an anode catalyst agent manufacturing process is performed (process 202). During this process, using a 2: 1: 2 weight ratio of Pt—Ru—C nanocatalyst particles, formulate 1 gram in a glass flask and add 4-8 milliliters of Nafion Solution. Thereafter, the prepared anode catalyst material is subjected to ultrasonic vibration or high-speed stirring to produce a uniform anode catalyst agent (step 203).

  Furthermore, a cathode catalyst agent manufacturing process is executed (process 204). During the cathodic catalyst production process, use a 1: 1 weight ratio of Pt-C nanocatalyst particles, formulate 1 gram in a glass flask and add 4-8 milliliters of Nafion Solution. Thereafter, the prepared cathode catalyst material is ultrasonically vibrated to produce a uniform cathode catalyst agent (step 205).

  After the above-described ion exchange membrane cleaning step, anode catalyst solution preparation step, and cathode catalyst solution preparation step are completed, a membrane electrode assembly manufacturing step is performed. FIG. 5 is a flowchart of the manufacturing process of the membrane electrode assembly of the present invention.

  First, the ion exchange membrane is cut into an appropriate area, and after cleaning, the ion exchange membrane is positioned on a stainless steel thin plate substrate (step 301). Further, a stainless steel thin plate substrate is placed on a screen printing table. In an embodiment of the present invention, the ion exchange membrane is cut into an area of 7 cm × 7 cm and positioned on a stainless steel thin plate having an area of 8 cm × 8 cm and a thickness of 0.2 mm.

  Subsequently, a steel screen having a mesh diameter of 0.05 to 0.3 mm and a mesh size of 30 to 160 (mesh) or a similar steel plate having an appropriate transition width and gap is selected as a printing plate material, and the printing plate material is screen-printed. It fixes to the screen fixing frame of a stand (process 302). A 5 cm × 5 cm area printed plate material pattern is uniformly coated on the anode catalyst agent that has been prepared with a squeegee (step 303). Further, the anode catalyst agent coated with the printing plate material pattern is printed on the ion exchange membrane placed on the stainless steel thin plate substrate (step 304).

  After the anode catalyst agent is printed on the ion exchange membrane, the ion exchange membrane absorbs the solvent in the catalyst agent and tends to cause a phenomenon of expansion. Therefore, immediately after screen printing, the ion exchange membrane is placed on a heating plate ( Step 305), the ion exchange membrane and the anode catalyst agent are heated from 70 degrees Celsius to 80 degrees Celsius, and the heating time is 1 to 5 minutes.

  The organic solvent that the ion exchange membrane absorbs after heating is volatilized by the heat, and when the ion exchange membrane and anode catalyst agent are heated on the heating plate due to the heat solidification of the catalyst agent itself, only a slight expansion phenomenon occurs. Can occur. However, it gradually recovers to a flat surface and no cracking phenomenon occurs.

  When the ion exchange membrane recovers flatly, that is, a uniform anode catalyst layer is formed on the anode side of the ion exchange membrane. Thereafter, a cathode catalyst agent layer printing step is further performed on the cathode side of the ion exchange membrane (step 306). The production process of the cathode catalyst agent layer is almost the same as the printing production process of the anode catalyst layer described above, that is, the process is performed by repeating the steps 301 to 304 described above, but the anode catalyst agent is used as the cathode catalyst agent. Revise.

  After the cathode catalyst agent is printed on the cathode catalyst agent, the ion exchange membrane is placed on a heating plate (step 307), the ion exchange membrane and the cathode catalyst agent are heated to 70 to 80 degrees Celsius, and the heating time is 1 ~ 5 minutes.

After forming an anode catalyst layer and a cathode catalyst agent layer on the anode side and cathode side of the ion exchange membrane, respectively, the ion exchange membrane after the screen printing process is placed in a hot press to perform a hot press process (process 308). The pressure in the hot pressing process is 20 to 100 kg / cm ² , the temperature is 110 to 140 degrees Celsius, and the time is 1 to 3 minutes.

  The ion exchange membrane after completion of the hot-pressing step has an anode catalyst layer and an ion exchange membrane layer completed by the above-described process treatment on both the opposite sides. Further, the diffusion layer carbon cloth cut to 5 cm × 5 cm is placed on the catalyst layers on both the front and back sides of the ion exchange membrane (step 309), and the anode gas diffusion layer and the cathode gas diffusion layer are formed, thus completing the membrane electrode assembly ( Step 310).

  During the above-described processing steps, first, the anode catalyst agent is printed on the anode side of the ion exchange membrane and then heated, and further, the cathode catalyst agent is printed on the cathode side of the ion exchange membrane and heated. However, in actual production, the cathode catalyst agent may be printed on the cathode side of the ion exchange membrane and heated first, and then the anode catalyst agent may be printed on the anode side of the ion exchange membrane and then heated. Of course, the cathode and the anode catalyst agent may be simultaneously printed and heated on the cathode side and the anode side of the ion exchange membrane.

  The above embodiments do not limit the scope of claims of the present invention, and any modification or change in detail that can be made based on the above description and drawings shall fall within the scope of the claims of the present invention.

It is a side view of a typical ion exchange membrane fuel cell unit. It is a three-dimensional view after assembling a plurality of fuel cell units of a known fuel cell set and combining related parts such as an anode current collector plate, an anode end plate, a cathode current collector plate, and a cathode end plate. It is a flowchart of the washing | cleaning process of the ion exchange membrane of this invention. It is a flowchart of catalyst agent solution manufacture of this invention. It is a flowchart of the membrane electrode assembly manufacturing process of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell unit 10 Membrane electrode assembly 100 Fuel cell set 11 Ion exchange membrane 12 Anode catalyst layer 13 Cathode catalyst layer 2 Anode gas diffusion layer 3 Anode conduction plate 4 Cathode gas diffusion layer 5 Cathode conduction plate 61 Anode current collection plate 62 Anode end plate 63 Cathode collector plate 64 Cathode end plate 71a Air inlet 71b Air outlet 72a Hydrogen gas inlet 72b Hydrogen gas outlet 73a Coolant inlet 73b Coolant outlet

Claims (18)

In the manufacturing method of the fuel cell membrane electrode assembly manufactured in the printing process,
(A) preparing an ion exchange membrane, an anode catalyst agent and a cathode catalyst agent solution;
(B) positioning the ion exchange membrane cut to a required area on a thin plate substrate, and further placing the thin plate substrate on a screen printing table;
(C) fixing the selected printing plate material to the screen fixing frame of the screen printing stand;
(D) a step of uniformly coating the printing plate material pattern on the printing plate material pattern with a squeegee and printing the catalyst agent on the printing plate material pattern on an ion exchange membrane on the thin plate substrate;
(E) a step of placing the ion exchange membrane on a heating plate after completion of screen printing and heating to recover the ion exchange membrane to form a uniform catalyst layer on the ion exchange membrane;
A method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, comprising the above steps.   2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, further comprising a step of cleaning the ion exchange membrane during the step (a). A method of manufacturing a fuel cell membrane electrode assembly. 3. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 2, wherein the cleaning step includes
(A) washing the ion exchange membrane in pure water at 80 degrees Celsius for 1 hour;
(B) a step of washing in a 1 volume molar hydrogen peroxide aqueous solution at 80 degrees Celsius for 1 hour;
(C) a step of washing in pure water at 80 degrees Celsius for 1 hour;
(D) a step of leaving in 1 M sulfuric acid at 80 degrees Celsius;
(E) A step of washing 2-3 times with pure water at 80 degrees Celsius,
A method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, comprising the above steps.   2. The method of manufacturing a fuel cell membrane electrode assembly according to claim 1, wherein the step of printing an anode catalyst agent on the anode side of the ion exchange membrane and heating is performed, and then the cathode on the cathode side of the ion exchange membrane. A method for producing a fuel cell membrane electrode assembly produced in a printing process, comprising the step of printing and heating a catalyst agent.   2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein the step of printing and heating the cathode catalyst agent on the cathode side of the ion exchange membrane is performed and then the anode on the anode side of the ion exchange membrane. A method for producing a fuel cell membrane electrode assembly produced in a printing process, comprising the step of printing and heating a catalyst agent.   The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein the step of simultaneously printing and heating the cathode catalyst agent on the cathode side and the anode catalyst agent on the anode side of the ion exchange membrane is performed. A method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.   2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein the anode catalyst agent prepared in the step (a) contains Pt-Ru-C, and the cathode catalyst agent contains Pt-C. A method for producing a fuel cell membrane electrode assembly produced by a printing process. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 7, wherein the preparation of the anode catalyst agent is:
(A) using a Pt—Ru—C nanocatalyst particle in a 2: 1: 2 weight ratio to formulate 1 gram in a container;
(B) adding 4-8 milliliters of Nafion Solution;
(C) a step of producing an anode catalyst agent by ultrasonic vibration or high-speed stirring of the prepared anode catalyst material;
A method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process.   8. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 7, wherein the prepared anode catalyst material is further stirred at a high speed to produce a uniform anode catalyst agent. A method of manufacturing a fuel cell membrane electrode assembly. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 7, wherein the preparation of the cathode catalyst agent is:
(A) using Pt—C nanocatalyst particles with a weight ratio of 1: 1 to prepare 1 gram in a container;
(B) adding 4-8 milliliters of Nafion Solution;
(C) a step of producing a cathode catalyst agent by ultrasonically vibrating the prepared cathode catalyst material;
A method of manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, comprising the above steps.   11. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 10, wherein the prepared cathode catalyst material is further stirred at a high speed to manufacture a uniform cathode catalyst agent. A method of manufacturing a fuel cell membrane electrode assembly.   2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein the anode catalyst agent prepared in the step (a) contains Pt-C, and the cathode catalyst agent also contains Pt-C. A method for producing a fuel cell membrane electrode assembly produced by a printing process, characterized by comprising:   2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein during the step (e), the temperature when the ion exchange membrane is placed on the heating plate and heated is 70 to 80 degrees Celsius, time The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process, characterized in that is performed for 1 to 5 minutes. 2. The method of manufacturing a fuel cell membrane electrode assembly manufactured by the printing process according to claim 1, wherein after the step ( e ), the ion-exchange membrane that has already undergone the screen printing step is placed in a hot press to perform hot pressing. A method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process, comprising: 15. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 14, wherein when the ion exchange membrane is subjected to hot pressure processing, the pressure received by the ion exchange membrane is 20 to 100 kgf / cm < ² > and the temperature is 110 to Celsius. 140. The method for manufacturing a fuel cell membrane electrode assembly manufactured in a printing process, characterized in that the time is from 1 to 3 minutes.   16. The method of manufacturing a fuel cell membrane electrode assembly manufactured by a printing process according to claim 15, wherein the anode catalyst layer and the cathode catalyst layer are provided on both the front and back surfaces of an ion exchange membrane that has already been hot-pressed and cut into a required area. A method for producing a fuel cell membrane electrode assembly produced in a printing process, further comprising the step of placing a diffusion layer carbon cloth to form an anode gas diffusion layer and a cathode gas diffusion layer.   2. The fuel cell membrane electrode assembly manufactured by a printing process according to claim 1, wherein the printing plate material is a screen having a mesh diameter and a mesh. Manufacturing method.   2. A fuel cell membrane electrode assembly manufactured in a printing process according to claim 1, wherein the printing plate material is a steel plate having a cross width and a gap. Manufacturing method.

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