JP5183057B2 - Direct fuel cell - Google Patents

Description

  The present invention relates to a direct fuel cell technology.

  A fuel cell is a device that generates electrical energy from hydrogen and oxygen, and can achieve high power generation efficiency. The main feature of the fuel cell is direct power generation that does not go through the process of thermal energy or kinetic energy as in the conventional power generation method, and therefore high power generation efficiency can be expected even on a small scale. In addition, there are few emissions of nitrogen compounds, etc., and noise and vibration are also small, so that environmental properties are good. Thus, since the fuel cell can effectively use the chemical energy of the fuel and has environmentally friendly characteristics, it is expected as an energy supply system for the 21st century. It is attracting attention as a promising new power generation system that can be used in various applications, from space use to automobiles and portable devices, from large-scale power generation to small-scale power generation, and technological development is in full swing toward practical application.

  Among them, the polymer electrolyte fuel cell is characterized by a lower operating temperature and a higher output density than other types of fuel cells. In recent years, a direct methanol fuel cell (DMFC) has attracted attention as an embodiment of a polymer electrolyte fuel cell. In DMFC, a methanol aqueous solution, which is a fuel, is directly supplied to the anode without modification, and electric power is obtained by an electrochemical reaction between the methanol aqueous solution and oxygen. By this electrochemical reaction, carbon dioxide is discharged from the anode, and generated water is discharged from the cathode as a reaction product. Aqueous methanol solution has higher energy per unit volume than hydrogen, and is suitable for storage and has a low risk of explosion, so it can be used in automobiles and mobile devices (cell phones, notebook personal computers, PDAs, MP3 players, It is expected to be used for power sources such as digital cameras, electronic dictionaries or electronic books.

In DMFC, high-concentration methanol fuel is used to enable continuous operation for a long time. Therefore, the vapor pressure of methanol is kept high in the fuel chamber for supplying methanol fuel to the anode. Since this methanol vapor may be discharged to the outside of the fuel cell together with the gas generated at the anode, various techniques have been developed to prevent this.
JP 2005-11695 A Special table 2004-5007047 gazette

  FIG. 7 is a graph showing the results of calculating the ratio of the amount of methanol lost due to evaporation to the amount of methanol used for power generation at three different concentrations. From the figure, it can be seen that as the concentration of methanol and the temperature of methanol during power generation increase, the proportion of methanol lost by evaporation increases. Since the passive fuel cell has a compact design that eliminates auxiliary equipment as much as possible, it is difficult to provide a mechanism for separating the methanol vapor from the gas generated at the anode and recovering the methanol vapor. It was not enough to use it effectively.

  The present invention has been made in view of such problems, and an object thereof is to provide a technique for effectively using methanol fuel so that it is not discharged outside the fuel cell.

One embodiment of the present invention is a direct fuel cell. The fuel cell includes a power generation unit including an electrolyte membrane, an anode provided on one surface of the electrolyte membrane, and a cathode provided on the other surface of the electrolyte membrane, and a gas generated at the anode An exhaust gas processing unit that captures the supplied fuel vapor in a liquid and discharges carbon dioxide contained in the gas, and another power generation unit that generates power using the fuel captured in the liquid of the exhaust gas processing unit, The power generation unit
And collecting unit is characterized that you have to share a single membrane.

  According to the direct type other fuel cell of this aspect, it becomes easy to effectively use the methanol fuel discharged to the outside of the fuel cell.

  According to the direct type fuel cell of this aspect, since the fuel trapped in the liquid in the exhaust gas treatment unit can be used for power generation, it becomes easier to use the fuel more effectively, and the fuel consumption of the entire fuel cell is easily improved.

  The direct fuel cell of the above aspect may further include generated water supply means for supplying water generated at the cathode to the liquid in the exhaust gas treatment unit.

  According to the direct fuel cell of this aspect, the user can be easily released from the trouble of supplying water to the liquid in the exhaust gas treatment unit. In addition, the treatment of water generated at the cathode is easily solved.

  In the direct fuel cell of the above aspect, the power generation unit and another power generation unit may be electrically connected in parallel.

  According to the direct fuel cell of this aspect, it becomes easier to supply power more stably.

  According to the direct fuel cell of the above aspect, the fuel holding unit that holds the fuel used in the power generation unit is further provided, and the fuel holding unit has a flow for sending the fuel vapor and the gas generated at the anode to the exhaust gas processing unit. A path may be formed.

  According to the direct fuel cell of this aspect, the fuel vapor accumulated in the flow path and the gas generated at the anode are more easily sent to the exhaust gas treatment unit.

  According to the present invention, methanol fuel generated inside a fuel cell is captured to facilitate effective use of methanol fuel.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram of a fuel cell according to the present embodiment. Hereinafter, the outline of the fuel cell according to the present embodiment will be described with reference to FIG.
The fuel cell 10 includes a fuel cell main part 20 and a fuel cell sub part 30. The fuel cell main unit 20 includes a cathode 22, an electrolyte membrane 12, an anode 24, and a fuel chamber 26. The fuel cell sub-part 30 includes a cathode 32, an electrolyte membrane 12, an anode 34, and an exhaust gas treatment part 36. Therefore, not only the fuel cell main part 20 but also the fuel cell auxiliary part 30 has a function as a power generation part. The fuel cell main part 20 and the fuel cell sub part 30 share one electrolyte membrane 12.

  The fuel chamber 26 is filled with an aqueous methanol solution or pure methanol (hereinafter referred to as “methanol fuel”). On the other hand, the exhaust gas treatment part 36 of the fuel cell sub part 30 is filled with water. The cathode 22 of the fuel cell main part 20 and the cathode 32 of the fuel cell sub part 30 are connected by a wiring 16. Similarly, the anodes of the fuel cell main part 20 and the fuel cell sub part 30 are also connected by the wiring 17. That is, the electrode of the fuel cell main part 20 and the electrode of the fuel cell sub part 30 are electrically connected in parallel. By being electrically connected in parallel, the fuel cell 10 can supply power more stably when generating power not only in the fuel cell main portion 20 but also in the fuel cell sub-portion 30.

  The fuel chamber 26 and the exhaust gas treatment unit 36 are connected by an exhaust gas communication path 18. The carbon dioxide gas generated at the anode 24 of the fuel cell main unit 20 by power generation is sent to the exhaust gas processing unit 36 through the exhaust gas communication path 18. The methanol concentration of the methanol fuel filled in the fuel chamber 26 is high so that the fuel cell can be used for a long time. Methanol vapor always exists in a space that is affected by the vapor pressure of high-concentration methanol and is not filled with liquid in the fuel chamber 26. This methanol vapor is sent to the exhaust gas treatment unit 36 together with the carbon dioxide gas generated at the anode 24.

  The methanol vapor sent to the exhaust gas treatment unit 36 together with the carbon dioxide gas is dissolved in water filled in the exhaust gas treatment unit 36. When the methanol concentration of the aqueous solution in the exhaust gas treatment unit 36 is lower than the methanol fuel in the fuel chamber 26, the vapor pressure of methanol in the exhaust gas treatment unit 36 is lower than in the fuel chamber 26. Therefore, the methanol vapor that has moved to the exhaust gas treatment unit 36 is condensed into a liquid and then dissolved in the water in the exhaust gas treatment unit 36. In some cases, methanol vapor is taken in and dissolved in the water in the exhaust gas treatment unit 36.

  Methanol dissolved in water in the exhaust gas treatment unit 36 is used by the fuel cell sub-unit 30 for power generation. Conventionally, by capturing methanol vapor discharged to the outside together with the carbon dioxide gas generated at the anode 24 and consuming it for power generation, the methanol fuel can be used more effectively, and the fuel consumption of the entire fuel cell 10 is improved. On the other hand, the carbon dioxide gas sent to the exhaust gas treatment unit 36 is discharged to the outside of the fuel cell 10.

  The cathode 22 of the fuel cell main unit 20 and the exhaust gas treatment unit 36 are connected by the generated water carrier 14. The generated water carrier 14 is made of a material that absorbs water by capillary action. The generated water carrier 14 absorbs water generated at the cathode 22 by power generation, and supplies the absorbed water to the exhaust gas treatment unit 36.

FIG. 2 is a perspective view of the fuel cell according to the present embodiment. FIG. 3 is an exploded perspective view of the fuel cell of FIG. 4 is a cross-sectional view taken along the line AA ′ of FIG. FIG. 5 is a cross-sectional view taken along the line BB ′ of FIG. Hereinafter, description will be made mainly with reference to FIG. 4 which is a cross section of the main part of the fuel cell.
The fuel cell 10 includes a plurality of cells 11 arranged on a plane. Each cell 11 includes a membrane electrode assembly including an electrolyte membrane 12 sandwiched between an anode 24 and a cathode 22. Methanol fuel is supplied to the anode 24. Air is supplied to the cathode 22. The fuel cell 10 generates power by an electrochemical reaction between methanol in methanol fuel and oxygen in air.

  The electrolyte membrane 12 preferably exhibits good ion conductivity in a wet state, and functions as an ion exchange membrane that moves protons between the anode 24 and the cathode 22. The electrolyte membrane 12 is formed of a solid polymer material such as a fluorine-containing polymer or a non-fluorine polymer, and for example, a sulfonic acid type perfluorocarbon polymer, a polysulfone resin, a perfluorocarbon polymer having a phosphonic acid group or a carboxylic acid group. Etc. can be used. Examples of the sulfonic acid type perfluorocarbon polymer include Nafion (manufactured by DuPont: registered trademark) 112. Examples of non-fluorine polymers include sulfonated aromatic polyetheretherketone and polysulfone.

  The electrolyte membrane 12 is bonded to one surface of the anode 24, and the current collector 56 is in contact with the other surface of the anode 24. The characteristics required for the base material of the current collector 56 include conductivity and rigidity. The base material of the current collector 56 is preferably covered with a metal having corrosion resistance such as gold or platinum. The current collector 56 is provided with a plurality of pores in a direction perpendicular to the surface direction. Methanol fuel is supplied to the anode 24 through the pores provided in the current collector 56. 3 shows a state in which the anode and the cathode are joined to the electrolyte membrane, and the current collector is in contact with the outside thereof.

  Returning to FIG. 4, a sealing material 42 is provided on the periphery of the electrolyte membrane 12 on the anode 24 side. A gap 33 is provided between the cells 11 and the adjacent cells are electrically insulated from each other. In order to press the sealing material 42 and the current collector 56 against the electrolyte membrane 12, an anode-side current collector support portion 48 is provided. An opening 47 is provided on the surface of the anode-side current collector support 48 that contacts the current collector 56. The methanol fuel taken in through the opening 47 passes through the pores of the current collector 56 and is supplied to the anode 24. A beam 51 between the adjacent openings 47 and the openings 47 is provided at a position corresponding to the gap 33 so that the methanol fuel is smoothly supplied to the anode 24, and the surface of the anode 24 is widely opened.

  As shown in FIG. 3, a narrower beam that intersects the beam 51 is provided on the surface of the anode-side current collector support portion 48 that is perpendicular to the direction of the membrane electrode assembly 50. By providing a thinner beam, the current collector 56 can be pressed more uniformly without hindering the supply of methanol fuel to the anode 24.

  Returning to FIG. 4, the anode-side current collector support portion 48 is sealed by the sealing material 43 and the lid 40 on the side opposite to the anode 24 in order to form the fuel chamber 26 for storing methanol fuel. The fuel chamber 26 is filled with a fuel holding portion 46. The fuel holding unit 46 absorbs and wets the methanol fuel so that the anode 24 is always in contact with the methanol fuel so that power can be generated regardless of the direction of the fuel cell. The fuel holding part 46 is adapted to the opening 47 provided in the anode-side current collector support part 48 and is formed so as to contact the anode 24.

  As a material constituting the fuel holding portion 46, felt, sponge, resin particle sintered body, resin fiber sintered body, natural fiber, resin fiber bundle, and the like are suitable. Further, the fuel holding portion 46 is formed with a plurality of holes of several tens of μm or less for sufficiently absorbing methanol fuel and a plurality of holes of the order of 0.1 mm to 1 mm for allowing carbon dioxide gas generated from the anode 24 to pass through. It is desirable.

  It is desirable that a flow path 62 be provided on the surface of the fuel holding unit 46 that contacts the current collector 56. Since the flow path 62 is provided as a concave groove on the surface of the fuel holding portion 46 that contacts the current collector 56, the carbon dioxide gas generated in the anode 24 by power generation is accumulated in the flow path 62.

  A fuel receiving port 49 is provided on the side of the anode current collector support 48 on the fuel tank 28 side (see FIG. 3). The fuel tank 28 is provided with a convex fuel supply port 38 that matches the diameter of the fuel receiving port 49. The fuel holding unit 46 absorbs methanol fuel supplied from the fuel supply port 38 by capillary action and supplies the methanol fuel to the anode 24 in contact therewith. The fuel receiving port 49 is provided with a check valve so that even if the fuel supply port 38 of the fuel tank 28 is removed, the methanol fuel held in the fuel holding portion 46 does not flow outside.

  The electrolyte membrane 12 is bonded to one surface of the cathode 22, and the current collector 57 is in contact with the other surface of the cathode 22. The configuration of the current collector 57 is the same as that of the current collector 56. In order to press the current collector 57 against the electrolyte membrane 12, a cathode-side current collector support portion 54 is provided. An air intake port 58 for taking in air is provided on the surface of the cathode-side current collector support portion 54 that comes into contact with the current collector 57. The air flowing in from the air intake port 58 is supplied to the cathode 22. In order to smoothly supply air to the cathode 22, a beam 59 between the adjacent air intake ports 58 and the air intake ports 58 is provided so as to be positioned between the cells 11 and 11. The surface of is widely open.

  On the cathode 22 side, a generated water carrier 52 is provided between the cells 11. The water generated at the cathode 22 by power generation is absorbed by the generated water carrier 52 located around the cell. As a material constituting the generated water carrier 52, the material exemplified for the fuel holding unit 46 can be used.

Next, the relationship between the fuel cell main part and the exhaust gas treatment part will be described with reference to FIG.
The fuel cell main part 20 includes an electrolyte membrane 12 shared with the fuel cell sub-part 30. On the anode 24 side, the anode 24, the current collector 56, the seal material 42, the anode side current collector support part 48, and the seal material. 43, a lid 40 and a fuel holding part 46, and on the cathode 22 side, a cathode 22, a current collector 57, a generated water carrier 52 and a cathode side current collector support part 54 are provided. Each member is as described above. As is apparent from FIG. 3, the fuel cell main part 20 and the fuel cell sub-part 30 include the sealing material 43, the anode-side current collector support part 48, the sealing material 42, and the generated water transport in addition to the electrolyte membrane 12 The material 52 and the cathode current collector support 54 are shared.

  The fuel cell sub-part 30 is also provided with a plurality of cells 13 arranged on a plane. The cell 13 includes a membrane electrode assembly including the electrolyte membrane 12 sandwiched between the anode 34 and the cathode 32. Similar to the fuel cell main unit 20, the current collector 66 is in contact with the anode 34, and the current collector 67 is in contact with the cathode 32. As shown in the membrane electrode assembly 50 of FIG. 3, the same number of cells 13 as the cells 11 are provided in one-to-one correspondence with the cells 11 of the fuel cell main part 20.

  Returning to FIG. 5, on the anode side, the space formed by the anode-side current collector support portion 48, the sealing material 43 and the lid 40 is divided into two by the partition wall 60 of the anode-side current collector support portion 48. . A fuel chamber 26 is provided on the fuel cell main part 20 side, and an exhaust gas treatment part 36 is provided on the fuel cell sub part 30. The exhaust gas treatment unit 36 is filled with a water retention material 44. As a material constituting the water retaining material 44, the material exemplified for the fuel retaining portion 46 can be used. The water retaining material 44 is formed so as to conform to an opening provided on a surface of the anode-side current collector support 48 that contacts the current collector 67 and to contact the anode 34.

  The carbon dioxide gas generated at the anode 24 by the power generation of the fuel cell main unit 20 is accumulated in the flow path 62 provided on the surface of the fuel holding unit 46 that is in contact with the current collector 56. The flow path 62 is provided as a concave groove on the surface in contact with the current collector 56 of the fuel holding portion 46 from the partition wall 60 to the side surface of the anode current collector support portion 48 in the short direction of the fuel cell.

  The methanol concentration of the methanol fuel held in the fuel holding unit 46 is high so that the fuel cell can be used for a long time. Therefore, under the influence of the vapor pressure of high-concentration methanol, methanol vapor exists in the space formed by the flow path 62 in addition to the generated carbon dioxide gas. The partition wall 60 is provided with an exhaust gas communication path 18 that communicates with the flow path 62. When the atmospheric pressure in the flow path 62 becomes higher than the atmospheric pressure of the exhaust gas processing unit 36 due to the carbon dioxide gas generated by the power generation, the carbon dioxide gas and methanol vapor accumulated in the flow path 62 pass through the exhaust gas communication path 18 and the exhaust gas processing unit. It flows into 36 water-retaining materials 44.

  In addition, since the flow path 62 is provided as a groove deeper than the height of the narrower beam 53 in the direction perpendicular to the surface of the current collector 56, the carbon dioxide gas and methanol vapor accumulated in the flow path 62 are It can move over the thinner beam 53. Therefore, the carbon dioxide gas and methanol vapor collected in the flow path 62 can flow into the exhaust gas processing unit 36 more smoothly.

  The methanol vapor that has flowed into the exhaust gas treatment unit 36 is condensed by a decrease in the vapor pressure of methanol to become a liquid, and then dissolved in the water retained in the water retention material 44. Alternatively, the methanol vapor is taken in and dissolved in the water retained in the water retention material 44. It is desirable to provide a gas-liquid separation membrane in the exhaust gas communication path 18 so that only carbon dioxide gas and methanol vapor flow into the water retaining material 44 and methanol fuel contained in the fuel holding portion 46 does not flow.

  In the fuel cell sub-part 30, a discharge port 68 is provided on the side surface of the anode-side current collector support part 48 in the direction parallel to the partition wall 60. The carbon dioxide gas that has flowed into the exhaust gas treatment unit 36 together with the methanol vapor is discharged from the fuel cell to the outside.

  The water retaining material 44 is in contact with the anode 34 through an opening provided on a surface of the anode-side current collector support 48 that contacts the current collector 66. Methanol dissolved in water held in the water retaining material 44 is supplied to the anode 34 and used for power generation of the fuel cell sub-part 30.

  It is not preferable to discharge methanol vapor to the outside of the fuel cell together with carbon dioxide generated by power generation. The fuel cell sub-part 30 captures methanol vapor by the exhaust gas treatment part 36 and solves the problem. Further, since the captured methanol vapor is used for power generation by the fuel cell sub-part 30, the methanol fuel can be used more effectively, and the fuel efficiency of the entire fuel cell is improved.

  In the power generation of the fuel cell sub-part 30, the current density increases or decreases depending on the concentration of methanol dissolved in the water retained in the water retention material 44. In such a situation, when PtRu is used as a material constituting the anode 34, Ru is eluted and the anode 34 is likely to deteriorate. In order to prevent deterioration, it is preferable to increase the particle diameter of PtRu used in the anode 34.

  Further, the water retaining material 44 is also in contact with the generated water carrying material 52 through an opening provided on the surface of the anode current collector support 48 that contacts the current collector 66. The generated water carrier 52 is located between the cells on the cathode side and absorbs water generated at the cathode by power generation. The absorbed water is supplied to the water retention material 44 through a location where the generated water carrier 52 and the water retention material 44 come into contact. Note that the methanol dissolved in the water contained in the water retaining material 44 is sequentially consumed by the power generation, so that the methanol does not flow out from the water retaining material 44 to the generated water carrying material 52.

  Since the water generated by the power generation of the fuel cell is supplied to the water retention material 44 of the exhaust gas treatment unit 36, the user is freed from the trouble of supplying water to the water retention material 44 himself. In addition, in a fuel cell that is often used inside a device, treatment of water generated at the cathode 22 becomes a problem, but this problem is also solved.

FIG. 6 is a schematic diagram showing wiring between cells of the fuel cell according to the present embodiment.
One cell of the fuel cell sub-part 30 is provided corresponding to one cell of the fuel cell main part 20. The anode of the fuel cell main part 20 and the anode of the corresponding fuel cell sub part 30 are connected, and the cathode of the fuel cell main part 20 and the cathode of the corresponding fuel cell sub part 30 are connected. Thus, both cells are electrically connected in parallel. By being electrically connected in parallel, when power is generated not only by the fuel cell main part 20 but also by the fuel cell auxiliary part 30, the fuel cell can supply power more stably.

  In the fuel cell according to the present embodiment, a plurality of cells of the fuel cell main part 20 and the fuel cell sub part 30 connected in parallel are provided. The plurality of sets of cells are electrically connected in series. By connecting a plurality of sets of cells in series, the fuel cell can supply necessary power to the outside.

  Specifically, the negative electrode of the device connected to the fuel cell and the anode 24a of the first cell of the fuel cell main part 20 are connected by the interconnector 64a. The cathode 22a of the first cell of the fuel cell main part 20 and the anode 24b of the second cell of the fuel cell main part 20 are connected by an interconnector 64b. Similarly, the cathode 22b of the second cell of the fuel cell main part 20 and the anode 24c of the third cell of the fuel cell main part 20 are connected to the cathode 22c of the third cell of the fuel cell main part 20 and the fuel. The anode 24d of the fourth cell of the battery main part 20 is the cathode 22d of the fourth cell of the fuel cell main part 20, and the anode 24e of the fifth cell of the fuel cell main part 20 is the fuel cell main part. The cathode 22e of the 20th fifth cell and the anode 24f of the sixth cell of the fuel cell main part 20 are connected by an interconnector. The cathode 22f of the sixth cell of the fuel cell main part 20 is connected to the positive electrode of the device connected to the fuel cell by the interconnector 64c.

  In the above-described embodiment, the same number of cells of the fuel cell sub-part 30 are provided as the number of cells of the fuel cell main part 20, but the same number of cells of the fuel cell sub-part 30 and 20 cells of the fuel cell main part are provided. There is no need. For example, one cell of the fuel cell sub-part 30 may be provided for a plurality of cells of the fuel cell main part 20. In this case, one cell of the fuel cell sub-part 30 is electrically connected in parallel with any one of the plurality of cells of the fuel cell main part 20.

  Further, in the embodiment described above, one cell of the fuel cell sub-part 30 is provided for one cell of the fuel cell main part 20, but for one cell of the fuel cell main part 20, A plurality of cells of the fuel cell sub-part 30 may be provided. Also in this case, all the cells of the fuel cell sub-part 30 provided are electrically connected to one cell of the fuel cell main part 20 in parallel.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The form can also be included in the scope of the present invention.

It is a schematic diagram of the fuel cell concerning this embodiment. It is a perspective view of the fuel cell concerning this embodiment. FIG. 3 is an exploded perspective view of the fuel cell of FIG. 2. It is sectional drawing on the A-A 'line of FIG. It is sectional drawing on the B-B 'line of FIG. It is the schematic diagram which showed the wiring between each cell of the fuel cell which concerns on this embodiment. It is the graph which showed the result of having calculated the ratio of the amount of methanol lost by evaporation with respect to the amount of methanol used for electric power generation in three different density | concentrations.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel cell, 11 cell, 12 Electrolyte membrane, 13 cell, 14 Product water conveyance material, 16 wiring, 17 wiring, 18 Exhaust gas communication path, 20 Fuel cell main part, 22 Cathode, 24 Anode, 26 Fuel chamber, 28 Fuel tank , 30 Fuel cell sub-portion, 32 Cathode, 33 Gap, 34 Anode, 36 Exhaust gas treatment unit, 38 Fuel supply port, 40 Lid, 42 Sealing material, 43 Sealing material, 44 Water retention material, 45 Gas-liquid separation membrane, 46 Fuel holding Part, 47 opening, 48 anode side current collector support part, 49 fuel receiving port, 50 membrane electrode assembly, 51 beam, 52 generated water carrier, 53 beam, 54 cathode side current collector support part, 56 current collector 57 Current collector, 58 Air intake port, 59 Beam, 60 Bulkhead, 62 Flow path, 64 A Tar connector, 66 current collector, 67 current collector, 68 outlet.

Claims (4)

The fuel vapor supplied together with the gas generated at the anode, the power generation unit including an electrolyte membrane, an anode provided on one surface of the electrolyte membrane, and a cathode provided on the other surface of the electrolyte membrane An exhaust gas treatment unit that captures carbon dioxide contained in the gas, and another power generation unit that generates power using the fuel captured in the liquid of the exhaust gas treatment unit,
The direct fuel cell, wherein the power generation unit and the another power generation unit share one electrolyte membrane. The direct fuel cell according to claim 1, further comprising generated water supply means for supplying water generated at the cathode to the liquid of the exhaust gas treatment unit . Direct methanol fuel cell according to claim 1 or 2, and the power generating part and the another of the power generation unit is characterized that you have been electrically connected in parallel. A fuel holding unit for holding fuel used in the power generation unit;
The lifting portion, directly according to gas generated in the anode and the fuel vapor to any one of claims 1 to 3, wherein that you have been flow path formed to send to the exhaust gas treatment unit Type fuel cell.

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