BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is the flow diagram of a preferred embodiment of the present invention;
FIGS. 2
a to 2c are skeleton drawings of the structure achieved by the manufacturing process in FIG. 1;
FIG. 3 is the flow diagram of another preferred embodiment of the present invention.
FIGS. 4
a to 4c are skeleton drawings of the structure achieved by the manufacturing process in FIG. 3; and
FIG. 5 is the structural section of the MEA layer for fuel cell in present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is the flow diagram of a preferred embodiment of the present invention, and FIGS. 2a to 2c are skeleton drawings of the structure achieved by the manufacturing process in FIG. 1. As shown in FIG. 1, 2a, 2b and 2c, the manufacturing process of MEA layer for fuel cell in the present invention comprises step 101, 102 and 103, the description of which are separately given hereinbelow.
In step 101 while as shown in FIG. 2a, two racks 11 are separately pasted on the upper and lower surface of the proton exchange membrane 10. The proton exchange membrane 10 is a Nafion membrane. The racks 11 are rigid and are made from a kind of chemical resisting material with the characteristic of methanol/methanoic acid resisting, they can be made from a polymeric material such as resin and/or PP and/or PE. The area where the racks 11 are pasted on the upper and lower surface of the proton exchange membrane 10 is defined as the first area 10a while the other areas are defined as the second areas 10b, each area is divided into two corresponding parts: upper and lower. As a preferred embodiment, the present invention adopts resin for being spreaded on the first area 10a of the upper and lower surface of proton exchange membrane 10 while not a bit resin being spreaded on the second areas 10b of the upper and lower surface of proton exchange membrane 10.
In step 102 while as shown in FIG. 2b, catalyst 12 are spreaded on the second areas 10b of the upper and lower surface of the proton exchange membrane 10 by means of Nafion solution manufacturing process, the catalyst 12 is used as the catalyst of electrochemical reaction. For example, catalyst 12 is used as the catalyst of hydrogen-oxygen electrochemical reaction, and can be made from platinum/ruthenium alloys and/or platinum.
In step 103 while as shown in FIG. 2c, diffusion layers 13 are pasted on the second areas 10b of the upper and lower surface of the proton exchange membrane 10 which is spreaded with the catalyst 12 already, correspondingly. Each diffusion layer 13 is used for supporting the catalyst 12 and providing quality control of the gas and liquid on the surface of the proton exchange membrane 10 after hydrophobic treatment.
FIG. 3 is the flow diagram of another preferred embodiment of the present invention, and FIG. 4a to 4c are skeleton drawings of the structure achieved by the manufacturing process in FIG. 3. AS shown in FIG. 3, 4a, 4b and 4c, the manufacturing process of MEA layer for fuel cell in the present invention comprises step 201, 202 and 203, the description of which are separately given hereinbelow.
In step 201 while as shown in FIG. 4a, two racks 21 are separately pasted on the upper and lower surface of the proton exchange membrane 20. The proton exchange membrane 20 is a Nafion membrane. The rack 21 is rigid and is made from a kind of chemical resisting material with the characteristic of methanol/methanoic acid resisting, it can be made from a polymeric material such as resin and/or PP and/or PE. The area where the racks 21 are pasted on the upper and lower surface of the proton exchange membrane 20 is defined as the first area 20a while the other areas are defined as the second areas 20b, each area is divided into two corresponding parts: upper and lower. As a preferred embodiment, the present invention adopts resin for being spreaded on the first area 20a of the upper and lower surface of proton exchange membrane 20 while not a bit resin being spreaded on the second areas 20b of the upper and lower surface of proton exchange membrane 20.
In step 202 while as shown in FIG. 4b, catalyst 22 are spreaded on the surfaces of diffusion layers 23. The diffusion layer 23 is a carbon paper with a polarity of holes and it's used for supporting the catalyst 22 and providing quality control of the gas and liquid on the surface of the proton exchange membrane 20. the catalyst 22 is the catalyst of electrochemical reaction after hydrophobic treatment. For example, catalyst 22 is the catalyst of hydrogen-oxygen electrochemical reaction, and can be made from platinum/ruthenium alloys and/or platinum.
In step 203 while as shown in FIG. 4c, the diffusion layers 23 with the catalyst 22 on them are pasted to the second areas 20b of the upper and lower surface of the proton exchange membrane 20, correspondingly.
As shown in FIG. 5, it's the structure of MEA layer in the present invention achieved by the embodiment mentioned above. The first areas 30a and the second areas 30b are separately defined on the upper and lower surface of the proton exchange membrane 30. There are structures of racks 31 projected from the surface of the proton exchange membrane 30 in the first areas 30a and there are catalyst 32 and diffusion layer 33 separately set in the second areas 30b. Therefore, the area extensions or contractions of the second areas 30b of the proton exchange membrane 30 caused by the dryness or dampness are separately from each other, so no position shift will be arisen among second areas 30b. Subsequently, it's easy to correspond to the second areas 30b with catalyst 32 and diffusion layers 33 in the proton exchange membrane 30 for finishing the assembly in the following assembling process, and the MEA layer for electrochemical reaction of the fuel cell will be formed in the second areas 30b of the proton exchange membrane 30.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Patent Application
20070275848
