JP4827635B2 - Direct methanol fuel cell - Google Patents

Description

  The present invention relates to a direct methanol fuel cell, and more particularly to a small direct methanol fuel cell suitable for use as a power source for portable electronic devices such as a mobile phone and a notebook personal computer.

  In general, a fuel cell includes a fuel cell in which an air electrode layer, an electrolyte layer, and a fuel electrode layer are stacked, a fuel supply body for supplying fuel as a reducing agent to the fuel electrode layer, and an oxidation to the air electrode layer. It is a battery that consists of an air supply body for supplying air as an agent, causes an electrochemical reaction in the fuel cell by the fuel and oxygen in the air, and obtains electric power outside. A form of this has been developed.

In recent years, due to increasing awareness of environmental issues and energy conservation, the use of fuel cells as clean energy sources for various applications has been studied. In particular, power can be generated simply by supplying liquid fuel containing methanol and water directly. Direct methanol fuel cells have attracted attention (see, for example, Patent Documents 1 and 2).
Among these, a liquid fuel cell (for example, see Patent Documents 3 and 4) using capillary force for supplying liquid fuel is known.

  Since these liquid fuel cells supply liquid fuel from a fuel tank to the fuel electrode with capillary force, there is an advantage in miniaturization such as not requiring a pump for pumping liquid fuel. Although the liquid fuel cell using only the battery is suitable for downsizing, the fuel is supplied directly to the fuel electrode in a liquid state, so it is mounted on a small portable device and is used in an environment where the front, back, left, right, top, and bottom of the battery unit are constantly changing. Causes incomplete fuel follow-up during long periods of use, which can cause problems such as fuel supply interruptions and bubble entry into the tank, or obstructing a constant fuel supply to the fuel rods It has become.

Further, as one of solutions to these drawbacks, for example, a system in which liquid fuel is introduced into a cell by capillary force and then the liquid fuel is vaporized in a fuel vaporization layer (see, for example, Patent Document 5). However, there is a problem that insufficient followability of fuel, which is a basic problem, is not improved, and the fuel cell of this structure is a system that is used as fuel after vaporizing a liquid, There are problems such as difficulty in miniaturization.
As described above, in the conventional direct methanol fuel cell, when supplying liquid fuel directly to the fuel electrode, the supply of fuel is unstable and the output value during operation varies, or the portable device maintains its stable characteristics. Currently, it is difficult to reduce the size to such an extent that it can be mounted on a vehicle.
JP-A-5-258760 JP-A-5-307970 JP 59-66066 A JP-A-6-188008 JP 2001-102069 A

  The present invention has been made in view of the problems and current situation of the above-described conventional direct methanol fuel cell, and has been made to solve this problem, by stably supplying liquid fuel directly to the fuel electrode and reducing the size of the fuel cell. It is an object of the present invention to provide a direct methanol fuel cell that can achieve the above.

  As a result of intensive studies on the above-described conventional problems, the present inventors constructed an electrolyte layer on the outer surface of a fuel electrode body made of a microporous carbon body, and constructed an air electrode layer on the outer surface of the electrolyte layer. In the fuel cell in which a plurality of unit cells are connected to each other, the above-mentioned direct methanol type can be obtained by connecting a fuel supply body having a specific structure directly connected from the fuel storage layer to the fuel supply to each unit cell. The present invention was completed by successfully obtaining a fuel cell.

That is, the present invention resides in the following (1) to (7).
(1) and the fuel storage tank for all the liquids fuel is stored by occlusion body made of a porous material and / or fiber bundles body having a capillary force, it is connected to the fuel reservoir, across the fuel storage tank constructs a fuel supply having a penetration structure in a narrow cross-sectional area than the area, an electrolyte layer external surface of the fuel electrode body made of infinitesimal carbon porous body, to build an air electrode layer on the external surface of the electrolyte layer A plurality of unit cells connected in series by the fuel supply body having the permeation structure, or connected in parallel, and each unit cell is connected by the fuel supply body, A direct methanol fuel cell, wherein the liquid fuel is supplied to the fuel electrode body .
(2) The direct methanol fuel cell according to (1), wherein the end of the fuel supply body is connected to a spent fuel storage tank.
(3) The direct methanol fuel cell according to (1) or (2) above, wherein the fuel storage tank comprises a replaceable cartridge structure.
(4) The direct methanol fuel cell according to any one of (1) to (3), wherein the fuel electrode body functions as a fuel supply body.
(5) The fuel supply body from the fuel storage tank to the spent fuel storage tank is composed of the fuel storage tank, the fuel electrode body and / or the fuel supply body in contact with the fuel electrode body, and the capillary force of the used fuel storage tank. The direct methanol fuel cell according to any one of (2) to (4), wherein tank <fuel electrode body and / or fuel supply body in contact with fuel electrode body <used fuel storage tank.
(6) The direct methanol fuel cell according to any one of (1) to (5), wherein the fine carbon porous body is a carbon composite molded body having fine communication holes made of amorphous carbon and carbon powder. .
(7) The direct methanol fuel cell according to (6), wherein the carbon powder is at least one selected from highly oriented pyrolytic graphite (HOPG), quiche graphite, natural graphite, artificial graphite, carbon nanotube, and fullerene.

According to the first aspect of the present invention, liquid fuel can be supplied directly and stably from the fuel storage tank to each unit cell without backflow or interruption, and can be carried on a mobile phone or a notebook computer. Provided is a small direct methanol fuel cell suitable for use as a power source for electronic equipment.
According to the second aspect of the present invention, liquid fuel that is not used for the reaction is stored in the storage layer when the supply is over due to operating conditions, so that a direct methanol fuel cell that can prevent reaction inhibition is provided. The
According to the third aspect of the present invention, there is provided a direct methanol fuel cell in which liquid fuel can be replaced more easily.
According to the invention of claim 4, since the fuel electrode body functions as a fuel supply body, there is provided a direct methanol fuel cell that can further improve the performance and efficiency of each unit cell and reduce the size.
According to the invention of claim 5, even when the fuel cell is left in any state (angle), upside down, etc., the liquid fuel flows back directly from the fuel storage tank to each unit cell, and is stable and continuous without interruption. There is provided a direct methanol fuel cell that can be supplied in an automated manner.
According to the sixth and seventh aspects of the present invention, there is provided a direct methanol fuel cell that can further improve the reaction efficiency in the fuel electrode body of the fuel cell.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1A to 1C show a basic form of a direct methanol fuel cell (hereinafter simply referred to as “fuel cell”) A showing a first embodiment of the present invention.
In this fuel cell A, as shown in FIGS. 1A to 1C, a fuel storage tank 10 for storing liquid fuel and an electrolyte layer 23 are formed on the outer surface of a fuel electrode body 21 made of a microcarbon porous body. A fuel supply body having unit cells (fuel cell) 20 and 20 formed by constructing an air electrode layer 24 on the outer surface of the electrolyte layer 23 and an infiltration structure connected to the fuel storage tank 10. 30 and a spent fuel storage tank 40 provided below the fuel supply body 30, and the unit cells 20, 20 are connected in series to the fuel supply by the fuel supply body 30, so that each unit cell 20 , 20 are sequentially supplied with fuel.

Examples of the liquid fuel stored in the fuel storage tank 10 include a methanol liquid composed of methanol and water. Hydrogen supplied as fuel in a fuel electrode body to be described later is hydrogen ions (H +) and electrons (e− The liquid fuel is not particularly limited as long as it can be decomposed into (1), and depending on the structure of the fuel electrode body, for example, a liquid fuel having each hydrogen source such as dimethyl ether (DME, CH3OCH3) can also be used. . In the present embodiment, the liquid fuel is occluded in an occlusion body 10 a such as a batting, a porous body, or a fiber bundle housed in the fuel storage tank 10. The occlusion body 10a is not particularly limited as long as it can occlude liquid fuel, and one having the same configuration as the material of the fuel supply body 30 described later can be used.
The material of the fuel storage tank 10 is not particularly limited as long as it has storage stability and durability with respect to the liquid fuel to be stored. For example, a metal such as stainless steel, polypropylene, polyethylene, Examples include synthetic resins such as polyethylene terephthalate (PET).

Each fuel cell 20 as a unit cell has a fuel electrode body 21 made of a micro-columnar carbon porous body, and has a through portion 22 that penetrates the fuel supply body 30 at the center thereof, and the fuel electrode body 21. An electrolyte layer 23 is constructed on the outer surface of the electrode layer, and an air electrode layer 24 is constructed on the outer surface of the electrolyte layer 23. A theoretical electromotive force of about 1.2 V is generated for each fuel cell 20.
The fine columnar carbon porous body constituting the fuel electrode body 21 may be a porous structure having fine communication holes, and is composed of, for example, a three-dimensional network structure or a point-sintered structure, and includes amorphous carbon and carbon. Carbon composite molded body composed of powder, isotropic high-density carbon molded body, carbon fiber papermaking molded body, activated carbon molded body, etc., preferably, reaction control at the fuel electrode of the fuel cell is easy and reaction From the viewpoint of further improving efficiency, a carbon composite molded body having fine communication holes made of amorphous carbon and carbon powder is desirable.
The carbon powder used for the production of the carbon composite having the porous structure includes highly oriented pyrolytic graphite (HOPG), quiche graphite, natural graphite, artificial graphite, carbon nanotube, At least one (single or a combination of two or more) selected from fullerenes is preferred.
Further, a platinum-ruthenium (Pt-Ru) catalyst, an iridium-ruthenium (Ir-Ru) catalyst, a platinum-tin (Pt-Sn) catalyst catalyst, and the like are present on the outer surface of the fuel electrode body 21. It is formed by a method of impregnating or dipping a solution containing a metal fine particle precursor such as a complex or the like, or a method of electrodeposition of metal fine particles.

Examples of the electrolyte layer 23 include ion exchange membranes having proton conductivity or hydroxide ion conductivity, for example, fluorine ion exchange membranes including Nafion (Nafion, manufactured by Du Pont), heat resistance, Good suppression of methanol crossover, for example, a composite membrane using an inorganic compound as a proton conducting material and a polymer as a membrane material, specifically, using a zeolite as the inorganic compound and a styrene-butadiene system as the polymer Examples thereof include a composite film made of rubber, a hydrocarbon-based graft film, and the like.
As the air electrode layer 24, carbon having a porous structure in which platinum (Pt), palladium (Pd), rhodium (Rh) or the like is supported by a method using a solution containing the above-mentioned metal fine particle precursor or the like. A porous body is mentioned.

  The fuel supply body 30 is not particularly limited as long as it is connected to the storage body 10a for storing liquid fuel stored in the fuel storage tank 10 and has a permeation structure capable of supplying the liquid fuel to each unit cell 20. For example, a porous body having a capillary force composed of felt, sponge, or a sintered body such as a resin particle sintered body and a resin fiber sintered body, natural fibers, animal hair fibers, polyacetal resins, Fiber bundles comprising one or a combination of two or more of acrylic resins, polyester resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc. The porosity of these porous bodies and fiber bundles is appropriately set according to the supply amount to each unit cell 20. It is intended.

The spent fuel storage tank 40 is disposed below the fuel supply body 30. An occlusion body 41 such as a porous body or a fiber bundle that occludes spent fuel is built in the storage layer 40 and is connected to the end of the fuel supply body 30.
The liquid fuel supplied by the fuel supply body 30 is used for the reaction in the fuel battery cell 20, and since the fuel supply amount is linked to the fuel consumption amount, it is unreacted and discharged out of the battery. However, unlike the conventional liquid fuel cell, there is no need for a processing system on the fuel outlet side, but when there is an excessive supply depending on the operating conditions, liquid fuel that is not used for the reaction is stored in the storage layer 40. It has a structure that can be stored in and prevent reaction inhibition.
In addition, 50 connects the fuel storage tank 10 and the spent fuel storage tank 40, and reliably supplies liquid fuel directly from the fuel storage tank 10 to each of the unit cells 20 and 20 via the fuel supply body 30. It is a member made of a mesh structure or the like.

The fuel cell A according to the present embodiment configured as described above has the liquid fuel occluded in the occlusion body 10a in the fuel storage tank 10 by the permeation structure of the fuel supply body 30 in the fuel cell units 20 and 20 by capillary force. To be introduced.
In the present embodiment, the capillary force of the fuel storage tank 10 (occlusion body 10a), the fuel electrode body 21 and / or the fuel supply body 30 in contact with the fuel electrode body 21, and the spent fuel storage tank 40 is the fuel storage tank 10 (occlusion). The body 10a) <the fuel electrode body 21 and / or the fuel supply body 30 in contact with the fuel electrode body 21 <the spent fuel storage tank 40, so that the fuel cell A can be left in any state (angle), upside down, etc. Even in this case, the liquid fuel can be supplied from the fuel storage tank 10 directly to each of the unit cells 20 and 20 stably and continuously without backflow or interruption.

Moreover, in the fuel cell A of this embodiment, since it becomes a structure that can smoothly supply liquid fuel as it is without vaporization without using an auxiliary device such as a pump, a blower, a fuel vaporizer, and a condenser in particular, It becomes possible to reduce the size of the fuel cell.
In the fuel cell A of the present embodiment, the fuel electrode body 21 that is a microporous carbon body constructs a structure that selectively exposes the edge surface portion of the graphite structure that is excellent in catalytic reaction activity on the fuel electrode side. Since the entire material is excellent in electrical conductivity and corrosion resistance, and is lightweight, it is possible to obtain a battery that does not deteriorate with time and does not vary in performance as the battery reaction occurs when no precious metal catalyst is used or in a smaller amount. In addition, since the battery performance is good, the battery can be miniaturized.

Furthermore, in this embodiment, the capillary force of the fuel storage tank 10, the fuel electrode body 21 and / or the fuel supply body 30 in contact with the fuel electrode body 21, and the spent fuel storage tank 40 is the fuel storage tank 10 (occlusion body 10a). <Fuel electrode body 21 and / or fuel supply body 30 in contact with fuel electrode body 21 <Spent fuel storage tank 40 is set so that methanol aqueous solution serving as fuel is uniformly supplied to the fuel electrode by capillary force. It will be.
Furthermore, the fuel supply to each unit cell 20, 20 is connected to a fuel supply body 30 having a permeation structure that is directly connected from the end of the fuel storage layer 10, so that a fuel cell composed of a plurality of cells is provided. Miniaturization can be achieved.
Moreover, in this embodiment, since the storage body 10a for storing liquid fuel is built in the fuel storage tank 10, the liquid fuel is replenished from the upper opening of the fuel storage tank 10, or a batting or porous body is provided. By exchanging the occlusion body 10a, it is possible to easily replenish and replace the fuel, and to stably supply the liquid fuel. It should be noted that the storage body 41 in the spent fuel storage tank 40 or the spent fuel storage tank 40 itself containing the storage body 41 may be replaceable.
Furthermore, in this embodiment, although the form which used the two fuel cell 20 was shown, the number of the connection (series or parallel) of the fuel cell 20 is increased by use use of a fuel cell, and required electromotive force etc. It can be.
Therefore, in the fuel cell A of the present embodiment, a compact direct methanol fuel cell that can be used as a cartridge and can be used as a power source for portable electronic devices such as a mobile phone and a notebook computer is provided. Become.

FIG. 2 shows a fuel cell B according to a second embodiment of the present invention. In the following embodiments, the same reference numerals as those in FIG. 1 are used for the same configurations and effects as those in the first embodiment, and the description thereof is omitted.
As shown in FIG. 2, the fuel cell B includes a collector body 11 at a lower portion of the fuel storage tank 10 that stores liquid fuel, and the fuel is stored in the fuel storage tank 10. This is different from the first embodiment only in that it is supplied.
The collector body 11 has the same configuration as a member used in a direct liquid writing instrument, etc., and liquid fuel that is directly stored in the fuel storage tank 10 is caused to flow out excessively into the fuel supply body 30 due to changes in atmospheric pressure, temperature, or the like. The liquid fuel that has become excessive due to expansion or the like is held between the collector portions 11a, 11a,... Of the collector body 11 and returns to the fuel storage tank 10 when the atmospheric pressure and temperature change are restored. ing.
The fuel cell B of the second embodiment configured as described above has a structure in which a collector body 11 is further added to the fuel cell A of the first embodiment. In addition to exhibiting the same operation and effect, the collector body 11 can adjust the supply amount of the liquid fuel with respect to changes in atmospheric pressure, temperature, etc., and supply it to each unit cell 20 more stably.

FIGS. 3A and 3B show a fuel cell C showing a third embodiment of the present invention.
As shown in FIGS. 3 (a) and 3 (b), the fuel cell C is configured such that the liquid fuel in the fuel storage tank 10 is directly stored, and a valve member is provided below the fuel storage tank 10 for storing the liquid fuel. 12 further includes a second fuel storage layer 15, and the second fuel storage layer 15 contains a porous body or fiber bundle for storing liquid fuel. 2 The fuel storage layer 15 is different from the first embodiment only in that it is connected to a built-in porous body or fiber bundle and each unit cell 20 has a layered structure (flat plate structure). Is.
In the fuel cell C of the third embodiment configured as described above, the valve member 12 is opened and closed by pressing (knocking) the fuel storage tank 10, and when the fuel storage tank 10 is pressed (knocked). The valve member 12 is opened and the liquid fuel flows into the second fuel storage layer 15 for temporary storage. As a result, the liquid fuel is supplied to each unit cell 20 by the fuel supply body 30 and exhibits the same effects as those of the first embodiment.
Further, in the fuel cell C of the third embodiment, the valve member 12 can be opened and closed by pressing (knocking) the fuel storage tank 10 so that the fuel cell can operate as a fuel cell. Adjustment of the start time and suspension of use (interruption) can be easily performed.
Further, in the fuel cell C of the third embodiment, since each unit cell 20 has a layered structure, a large number of unit cells 20 can be connected in series to the fuel supply, so that the fuel cell has a high electromotive force. .

FIGS. 4A to 4D show a fuel cell D showing a fourth embodiment of the present invention.
As shown in FIGS. 4A and 4B, the fuel cell D includes a cartridge in which the liquid fuel in the fuel storage tank 10 is directly stored, and the fuel storage tank 10 in which the liquid fuel is stored can be replaced. It is a structure, a fuel supply mechanism having a liquid fuel inflow tank 14 at the lower part of the fuel storage tank 10 via an outflow valve 13, and a valve member 12 at the lower part of the liquid fuel inflow tank 14. The second fuel storage layer 15 further includes a porous body or fiber bundle for storing liquid fuel, and the fuel electrode body 21 of each unit cell 20 itself. Is a porous body, and is different from the first embodiment only in that it also functions as the fuel supply body 30 and that each unit cell 20 is connected in parallel to the fuel supply.
The unit cell 20 has a structure as shown in FIG. 4B, and the fuel electrode body 21 at the center of the cylinder is composed of a porous body having a capillary force equivalent to that of the fuel supply body 30. The fuel flow from the second fuel storage tank 15 to the spent fuel storage tank 40 is enabled. Further, this structure may have a shape in which the fuel electrode body 21 protrudes as shown in FIGS. 4 (c) and 4 (d).
In the fuel cell D of the fourth embodiment configured as described above, the outflow valve member 13 and the valve member 12 are opened and closed by pressing (knocking) the fuel storage tank 10. When pressed (knocked), the outflow valve 13 opens and flows into the liquid fuel inflow tank 14, and further the liquid fuel flows into the second fuel storage layer 15 for temporary storage by the valve member 12 that opens simultaneously. Thereby, the liquid fuel is supplied to each unit cell 20 by the fuel electrode body 21, and the same operation effect as the first embodiment is exhibited.
Further, in the fuel cell D of the fourth embodiment, since the fuel storage tank 10 is a cartridge type, fuel can be easily replenished and replaced, and the fuel storage tank is pressed (knocked). As a result, the outflow valve 13 and the valve member 12 can be opened and closed to operate as a fuel cell, so that it is possible to easily adjust the start time of use and stop (interrupt) use, and to stably and continuously supply liquid fuel. Can be supplied.
Furthermore, in the fuel cell D of the fourth embodiment, since each unit cell 20 has a porous structure, the fuel supply body 30 is not necessary, so that further improvement in performance and efficiency and miniaturization of each unit cell are realized. It becomes a fuel cell that makes it possible.

FIG. 5 shows a fuel cell E showing a fifth embodiment of the present invention.
As shown in FIG. 5, the fuel cell E is different from the first embodiment only in that a fuel supply body 30 is connected to each unit cell 20 in parallel to the fuel supply.
In the fuel cell E of the fifth embodiment, since it is possible to supply a large amount of fuel at the same time by connecting in parallel, it is possible to control the electromotive force. In the present invention, it is possible to control by the design of each capillary force.

6 (a) to 6 (d) show a fuel supply structure for connecting the fuel supply body 30 and each unit cell 20 in the fuel cell according to the present invention. A spent fuel storage tank 40 is provided.
FIG. 6A shows a structure in which fuel is sequentially supplied to each columnar unit cell 20 by fuel supply branch fluids 31, 31...
FIG. 6B shows a structure in which fuel is supplied to each columnar unit cell 20 simultaneously by fuel supply branch fluids 32, 32...
FIG. 6C shows a structure in which fuel is sequentially supplied to each layered unit cell 20 by fuel supply branch fluids 33, 33...
In FIG. 6D, each columnar unit cell 20 is provided in the shaft cylinder 60, and each columnar unit cell 20 is connected by a fuel supply body 30 penetrating through the central portion of each layered unit cell 20 to supply the fuel. The fuel is sequentially supplied to each layered unit cell 20 by the body 30.

Although the fuel cell of the present invention exhibits the configuration and the respective functions and effects as described above, the present invention is not limited to the above-described embodiment, and various modes can be used without departing from the scope of the present invention. Can also be implemented.
For example, the first to fifth embodiments may be combined. Specifically, a collector body may be provided in the second fuel storage tank 15 of the third embodiment (FIG. 3). The fuel storage tank 10 of the third embodiment (FIG. 3) may be changed to the cartridge structure of the fourth embodiment (FIG. 4), and the fuel supply body 30 in the fifth embodiment is further changed to the fourth embodiment. The fuel electrode body 21 may be omitted as well.

(A) is schematic sectional drawing which shows 1st Embodiment of this invention by a longitudinal cross-section aspect, (b) is a perspective view of a fuel unit cell, (c) is a longitudinal cross-sectional view of a fuel unit cell. It is a schematic sectional drawing which shows 2nd Embodiment of this invention in a longitudinal cross-sectional aspect. (A) is a schematic sectional drawing which shows 3rd Embodiment of this invention by a longitudinal cross-sectional aspect, (b) is a fragmentary longitudinal cross-sectional view which shows the principal part of a fuel unit cell. (A) is schematic sectional drawing which shows 4th Embodiment of this invention by a longitudinal cross-sectional aspect, (b) is a fragmentary longitudinal cross-sectional view of a fuel unit cell, (c) and (d) are another form. It is the fragmentary longitudinal cross-section and perspective view of a fuel unit cell which show. It is a schematic sectional drawing which shows 5th Embodiment of this invention by a longitudinal cross-sectional aspect. (A)-(d) is the schematic which shows the connection of a fuel supply body and each unit cell in the fuel cell of this invention, and a fuel supply structure.

Explanation of symbols

A fuel cell 10 fuel storage tank 20 unit cell 30 fuel supply body 40 spent fuel storage tank

Claims (7)

A fuel storage tank in which all of the liquids fuel is stored by occlusion body made of a porous material and / or fiber bundles body having a capillary force, is connected to the fuel reservoir, than the cross-sectional area of the fuel storage tank a fuel supply member having a penetrating structure in a narrow cross-sectional area, build the electrolyte layer external surface of the fuel electrode body made of infinitesimal carbon porous body, it is formed by constructing the air electrode layer on the external surface of the electrolyte layer A plurality of unit cells connected in series or in parallel by the fuel supply body having the permeation structure, and the unit cells are connected by the fuel supply body. Is supplied to the fuel electrode body, a direct methanol fuel cell. 2. The direct methanol fuel cell according to claim 1, wherein an end of the fuel supply body is connected to a spent fuel storage tank. The direct methanol fuel cell according to claim 1 or 2, wherein the fuel storage tank comprises a replaceable cartridge structure.   The direct methanol fuel cell according to claim 1, wherein the fuel electrode body functions as a fuel supply body. Wherein the fuel supply member from the fuel storage tank to said spent fuel storage tank, the fuel storage tank, the fuel electrode body and / or the fuel supply member in contact with the fuel electrode body, the spent fuel pool capillary force, a direct methanol fuel according to any one of claims 2-4 wherein the fuel pool <the fuel electrode body and / or the fuel supply member in contact with the fuel electrode body <is the spent fuel pool battery. The direct methanol fuel cell according to any one of claims 1 to 5, wherein the fine carbon porous body is a carbon composite molded body having fine communication holes made of amorphous carbon and carbon powder. The direct methanol fuel cell according to claim 6, wherein the carbon powder is at least one selected from highly oriented pyrolytic graphite (HOPG), quiche graphite, natural graphite, artificial graphite, carbon nanotube, and fullerene.

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