Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
  • H01M8/2465—Details of groupings of fuel cells
  • H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
  • H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
  • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
  • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
  • H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/10—Fuel cells with solid electrolytes
  • H01M2008/1095—Fuel cells with polymeric electrolytes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
  • H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
  • H01M2250/30—Fuel cells in portable systems, e.g. mobile phone, laptop
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M8/00—Fuel cells; Manufacture thereof
  • H01M8/10—Fuel cells with solid electrolytes
  • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
  • H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02B90/10—Applications of fuel cells in buildings
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/30—Hydrogen technology
  • Y02E60/50—Fuel cells
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Definitions

• the present invention relates to a fuel cell.
• DMFCs are classified according to the fuel supply method, gas supply type DMFCs, in which liquid fuel is vaporized and then sent into the fuel cell with a blower, etc., liquid supply type DMFCs in which the liquid fuel is directly sent into the fuel cell with a pump or the like,
• Examples include internal vaporization type DMFC that vaporizes liquid fuel in the cell and supplies it to the anode.
• An example of an internal vaporization type DMFC is disclosed in Japanese Patent Publication No. 341 3111.
• An internal vaporization type DMFC shown in Japanese Patent Publication No. 3413111 includes a fuel permeation layer for holding liquid fuel, and a fuel vaporization layer for diffusing a vaporization component of the liquid fuel held in the fuel permeation layer. It is to be prepared. With such a configuration, vaporized liquid fuel is supplied to the fuel electrode.
• Japanese Patent Laid-Open No. 2001-283888 also relates to an internal vaporization type DMFC, and includes an outer periphery of an electromotive portion provided with a fuel leakage prevention film for preventing leakage of liquid fuel on a side surface of a fuel electrode,
• an electromotive portion provided with a fuel leakage prevention film for preventing leakage of liquid fuel on a side surface of a fuel electrode
• the fuel cell described in Japanese Patent Application Laid-Open No. 2001-283888 has a configuration in which the heat insulating material is in contact with the fuel permeation layer. There is a problem that the methanol permeation amount increases and high output cannot be obtained due to crossover.
• An object of the present invention is to provide a fuel cell with improved output characteristics.
• a fuel cell according to the present invention includes a membrane electrode assembly including an anode, a force sword, and an electrolyte membrane disposed between the anode and the force sword.
• a fuel storage section for storing liquid fuel
• a fuel vaporization section for supplying a vaporized component of the liquid fuel to the anode, a moisture retention plate for suppressing transpiration of water from the power sword,
• a cover disposed outside the moisturizing plate and having an oxidant inlet
• a first heat insulating member that is laminated on at least one of an outer surface and an inner surface of the cover and has an opening at a location facing the acid agent inlet;
• a fuel cell according to the present invention includes a membrane electrode assembly including an anode, a force sword, and an electrolyte membrane disposed between the anode and the cathode;
• a fuel storage section for storing liquid fuel
• a fuel vaporization unit for supplying a vaporized component of the liquid fuel to the anode; an anode current collector disposed on the anode of the membrane electrode assembly;
• a force sword current collector disposed on the force sword of the membrane electrode assembly
• a fuel cell according to the present invention includes a membrane electrode assembly including an anode, a force sword, and an electrolyte membrane disposed between the anode and the cathode; A fuel storage section for storing liquid fuel;
• a cover disposed outside the force sword and having an oxidant inlet
• a first heat insulating member that is laminated on at least one of an outer surface and an inner surface of the cover and has an opening at a location facing the acid agent inlet;
• a fuel cell according to the present invention includes a membrane electrode assembly including an anode, a force sword, and an electrolyte membrane disposed between the anode and the cathode;
• a fuel storage section for storing liquid fuel
• An anode current collector disposed on the anode of the membrane electrode assembly
• a force sword current collector disposed on the force sword of the membrane electrode assembly
• FIG. 1 is a schematic cross-sectional view showing a direct methanol fuel cell according to a first embodiment of the present invention.
• FIG. 2 is a schematic plan view showing the heat insulating member of FIG.
• FIG. 3 is a schematic cross-sectional view showing a direct methanol fuel cell according to a second embodiment of the present invention.
• FIG. 4 is a schematic cross-sectional view showing a direct methanol fuel cell according to a third embodiment of the present invention.
• FIG. 5 is a characteristic diagram showing the relationship between the maximum output and the cell temperature of direct methanol fuel cells of Examples 1 to 3 and Comparative Example.
• FIG. 6 is a schematic cross-sectional view showing another direct methanol fuel cell according to the first embodiment of the present invention.
• the moisture retention plate can suppress the evaporation of moisture from the power sword, it can increase the amount of water retained in the power sword as the power generation reaction proceeds. Can create many states. As a result, the reaction in which water in the power sword diffuses to the anode through the electrolyte membrane can be promoted, so that the reaction resistance of the catalytic reaction at the anode can be lowered.
• FIG. 1 is a schematic cross-sectional view showing a direct methanol fuel cell according to the first embodiment of the present invention.
• FIG. 2 is a schematic plan view showing the heat insulating member of FIG.
• a membrane electrode assembly (MEA) 1 includes a force sword (oxidant electrode) 3 composed of a force sword catalyst layer 2a and a force sword gas diffusion layer 2b, an anode catalyst layer 4a and an anode gas. It comprises an anode (fuel electrode) 5 composed of a diffusion layer 4b, and a proton-conductive electrolyte membrane 6 disposed between the force sword catalyst layer 2a and the anode catalyst layer 4a.
• the force sword catalyst layer 2a includes force sword catalyst particles and proton conductive resin.
• the anode catalyst layer 4a preferably contains anode catalyst particles and proton conductive resin.
• Examples of the force sword catalyst and the anode catalyst include platinum group element simple metals (Pt, Ru, Rh, Ir, Os, Pd, etc.), alloys containing platinum group elements, and the like. Although it is desirable to use platinum as the cathode catalyst, it is not limited to this. Ann As the catalyst, it is desirable to use Pt—Ru which has strong resistance to methanol and carbon monoxide, but it is not limited to this. Further, a supported catalyst using a conductive support such as a carbon material may be used, or an unsupported catalyst may be used.
• the proton conductive resin contained in the force sword catalyst layer 2a, the anode catalyst layer 4a, and the proton conductive electrolyte membrane 6 has, for example, a sulfonic acid group such as perfluorocarbon sulfonic acid. It is also possible to use inorganic substances such as fluorine-based resin, hydrated carbon-based resin having a sulfonic acid group, and tungsten phosphotungstic acid.
• the force sword catalyst layer 2a is laminated on the force sword gas diffusion layer 2b, and the anode catalyst layer 4a is laminated on the anode gas diffusion layer 4b.
• the force sword gas diffusion layer 2b plays a role of uniformly supplying the oxidant gas to the force sword catalyst layer 2a.
• the anode gas diffusion layer 4b plays a role of uniformly supplying fuel to the anode catalyst layer 4a.
• porous carbon paper can be used for the force sword gas diffusion layer 2b and the anode gas diffusion layer 4b.
• the anode conductive layer 7 as the anode current collector is laminated on the anode gas diffusion layer 4 b of the membrane electrode assembly 1.
• the force sword conductive layer 8 as a force sword current collector is laminated on the force sword gas diffusion layer 2 b of the membrane electrode assembly 1.
• the anode conductive layer 7 and the force sword conductive layer 8 are for improving the conductivity of the force sword and the anode.
• the anode conductive layer 7 and the force sword conductive layer 8 are provided with gas permeation holes (not shown) through which the oxidant gas or vaporized fuel permeates.
• a gold electrode in which an Au foil is supported on a PET base material can be used.
• One of the rectangular frame-shaped sealing materials 9 is formed on the proton conductive electrolyte membrane 6 so as to surround the periphery of the force sword 3.
• the other is formed on the opposite surface of the proton conductive electrolyte membrane 6 so as to surround the anode 5.
• the sealing material 9 functions as an O-ring for preventing fuel leakage and oxidant gas leakage as much as possible.
• a liquid fuel tank 10 as a fuel storage unit is disposed on the anode side of the membrane electrode assembly 1 (below the membrane electrode assembly 1 in FIG. 1).
• the liquid fuel tank 10 contains liquid methanol 11 or liquid fuel 11 that is a methanol aqueous solution. It is desirable that the concentration of the methanol aqueous solution be higher than 50 mol%. In addition, pure methanol pure The degree is desirably 95% by weight or more and 100% by weight or less.
• the liquid fuel stored in the liquid fuel tank 10 is not necessarily limited to methanol fuel.
• ethanol fuel such as ethanol aqueous solution or pure ethanol
• propanol fuel such as propanol aqueous solution or pure propanol
• glycol aqueous solution etc.
• Dalicol fuel such as pure glycol, dimethyl ether, formic acid, or other liquid fuel may be used.
• liquid fuel corresponding to the fuel cell is accommodated.
• a fuel vaporization unit for example, a gas-liquid separation membrane 12, for supplying a vaporized component of the liquid fuel to the anode is disposed.
• the gas-liquid separation membrane 12 is a membrane that allows only the vaporized component of the liquid fuel to permeate and does not allow the liquid fuel to permeate. Only the vaporized component of the liquid fuel can pass through the gas-liquid separation membrane 12 and supply the vaporized fuel to the anode 5.
• a water-repellent porous membrane can be used as the gas-liquid separation membrane 12.
• a frame 13 is disposed between the gas-liquid separation membrane 12 and the anode conductive layer 7.
• the space surrounded by the frame 13 functions as a vaporized fuel storage chamber 14 for adjusting the amount of vaporized fuel supplied to the anode.
• the moisturizing plate 15 is preferably made of an insulating material that is inert to methanol and has dissolution resistance, oxygen permeability, and moisture permeability.
• examples of such an insulating material include polyolefins such as polyethylene and polypropylene.
• a cover 17 in which a plurality of inlets 16 for an oxidant gas (eg, air) is formed is laminated on the moisture retention plate 15. Since the cover 17 also plays a role of pressurizing the stack including the membrane electrode assembly 1 to enhance its adhesion, for example, a metal such as SUS304, carbon steel, stainless steel, alloy steel, titanium alloy, or nickel alloy. Formed from.
• a metal such as SUS304, carbon steel, stainless steel, alloy steel, titanium alloy, or nickel alloy. Formed from.
• the first heat insulating member 18 covers the outer surface of the cover 17. As shown in FIG. 2, the first heat insulating member 18 is formed of a heat insulating material sheet in which a gas permeation hole 19 is opened at a location facing the oxidant introduction port 16. It is desirable that the thermal conductivity of the heat insulating material be in the range of 0. OlWZ (m'K) or more and lWZ (m'K) or less.
• PE polyethylene
• PET polyethylene terephthalate
• PEEK polyetheretherketone
• PPS polyphenylene sulfide
• PEI polyetherimide
• PI Polyimide
• relatively hard resin such as PTFE (polytetrafluoroethylene), and glass epoxy resin.
• the vaporized component of the liquid fuel in the liquid fuel tank 10 is supplied to the anode (also referred to as fuel electrode) catalyst layer 4 a through the gas-liquid separation membrane 12.
• the anode catalyst layer 4a protons (H +) and electrons (e_) are generated by an oxidation reaction of the fuel.
• the following equation (1) shows the catalytic reaction that occurs in the anode catalyst layer 4a when methanol is used as the fuel.
• Proton (H +) generated in the anode catalyst layer 4a diffuses to the force sword (also referred to as air electrode) catalyst layer 2a through the proton conductive membrane 6. At the same time, the electrons generated in the anode catalyst layer 4a flow through the external circuit connected to the fuel cell, work against the load (resistance, etc.) of the external circuit, and flow into the force sword catalyst layer 2a.
• the force sword also referred to as air electrode
• the oxidant gas such as air flows from the gas permeation hole 19 of the first heat insulating member 18 and the oxidant introduction port 16 of the cover 17 to the force sword catalyst layer 2a through the force sword conductive layer 8 and the force sword gas diffusion layer 2b.
• Oxygen in the oxidant gas undergoes a reduction reaction together with protons (H +) diffused through the proton conductive membrane 6 and electrons (e_) flowing through the external circuit to generate reaction products.
• H + protons
• e_ electrons
• the moisture retention plate 15 is disposed between the force sword 3 and the cover 17, the evaporation of moisture from the force sword 3 is suppressed, and moisture retention in the force sword catalyst layer 2a is maintained as the power generation reaction proceeds.
• the amount increases. For this reason, it is possible to create a state in which the water retention amount of the force sword catalyst layer 2a is larger than the water retention amount of the anode catalyst layer 4a.
• a reaction in which water generated in the force sword catalyst layer 2a moves to the anode catalyst layer 4a through the proton conductive membrane 6 can be promoted by the osmotic pressure phenomenon. Thereby, the reaction resistance of the catalytic reaction at the anode 5 can be lowered.
• the first heat insulating member 18 can suppress the heat release from the cover 17 due to the heat generated by the catalytic reaction and the combustion reaction, the temperature difference between the cover 17 and the moisture retaining plate 15 can be reduced. Can do. As a result, moisture condensation (or moisture liquefaction) on the moisture retaining plate 15 can be suppressed, and water clogging with the force sword 3 due to flatting can be reduced. Thereby, the oxidant gas can be stably supplied to the force sword 3.
• the first heat insulating member 18 may be laminated on the inner surface of the cover 17 by laminating the first heat insulating member 18 on the outer surface of the cover 17. An example of this is shown in Figure 6.
• the membrane electrode assembly that does not volatilize the liquid fuel abnormally can be kept warm.
• the fuel utilization efficiency increases, so the fuel port such as crossover decreases.
• the potential drop due to crossover is reduced and the output characteristics can be improved.
• the membrane / electrode assembly repeats volume expansion / contraction due to the power generation reaction, and the membrane / electrode assembly is sandwiched between heat insulating members. Decrease in wearability can be suppressed, and contact resistance can be reduced. This also improves the output characteristics of the fuel cell.
• FIG. 3 is a schematic cross-sectional view showing a direct methanol fuel cell according to the second embodiment of the present invention.
• the same members as those described in FIGS. 1 and 2 described above are denoted by the same reference numerals and description thereof is omitted.
• the second heat insulating members 20a and 20b are used instead of the first heat insulating member.
• the second heat insulating member 20 a is disposed between the force sword conductive layer 8 and the moisture retention plate 15.
• the second heat insulating member 20b is disposed between the anode conductive layer 7 and the frame 13.
• the second heat insulating members 20a and 20b are formed of a heat insulating material sheet in which a gas permeation hole 21 serving as a passage for oxidizing gas or vaporized fuel is opened.
• the thermal conductivity of the heat insulating material is preferably in the range of 0. OlWZ (m'K) or more and lWZ (m'K).
• Insulating materials with acid resistance and solvent resistance are preferred, for example, styrene butadiene rubber (SBR), NBR (acrylonitrile butadiene rubber), ethylene propylene rubber (EPDM), fluoro rubber, silicon rubber. And rubber materials such as acrylic rubber and urethane rubber, non-woven fabrics, fiber materials such as felt, foamed materials such as foamed polyethylene and foamed polystyrene, and vacuum heat insulating materials.
• SBR styrene butadiene rubber
• NBR acrylonitrile butadiene rubber
• EPDM ethylene propylene rubber
• fluoro rubber silicon rubber.
• rubber materials such as acrylic rubber and urethane rubber, non-woven fabrics, fiber materials such as felt, foamed materials such as foamed polyethylene and foamed polystyrene, and vacuum heat insulating materials.
• the second heat insulating members 20a and 20b have the same thermal conductivity, but have different thermal conductivity! /
• the membrane electrode assembly 1 that does not volatilize liquid fuel abnormally can be kept warm. wear.
• the fuel utilization efficiency increases, so that fuel loss such as crossover is reduced.
• potential drop due to crossover is reduced, and output characteristics can be improved.
• the membrane electrode assembly 1 repeats volume expansion / contraction in response to the power generation reaction, but since the membrane electrode assembly 1 is sandwiched between the second heat insulating members 20a and 20b, the volume expansion / contraction is reduced. It is possible to suppress a decrease in adhesion due to the contact, and to reduce the contact resistance. This also improves the output characteristics of the fuel cell.
• the fuel cell according to the second embodiment may or may not include the moisture retention plate 15.
• the membrane electrode assembly 1 has the second heat insulating property. Heat retention by the members 20a and 20b makes it possible to suppress clogging of the force sword 3 due to flatting. Become. As a result, output characteristics can be stabilized.
• FIG. 4 is a schematic sectional view showing a direct methanol fuel cell according to the third embodiment of the present invention.
• the same members as those described in FIGS. 1 to 3 described above are denoted by the same reference numerals and description thereof is omitted.
• both the first heat insulating member 18 and the second heat insulating members 20a and 20b are used.
• the first heat insulating member 18 may be disposed on the outer surface of the cover 17 as shown in FIG. 4 or may be disposed on the inner surface of the cover 17. Further, the cover 17 may be disposed on both the outer surface and the inner surface.
• the fuel cell of the third embodiment it is possible to prevent water clogging with the force sword 3 due to flatting, keep the membrane electrode assembly 1 warm, and reduce contact resistance. Therefore, the output characteristics can be sufficiently improved.
• the membrane electrode assembly 1 is sufficiently kept warm, the anode reaction rate is improved and the fuel utilization efficiency is increased, so that fuel loss such as crossover is reduced. As a result, the potential drop due to crossover is reduced and the output characteristics can be improved.
• the thermal conductivity [WZ (m'K)] of the first heat insulating member is ⁇ , and the thermal conductivity of the second heat insulating member
• the membrane electrode assembly 1 reacts with power generation.
• the thermal conductivity 2 it can be kept warm with heat. Also, by setting the thermal conductivity 2 to 1 Zio or less, the reaction heat accompanying power generation can be transferred to the moisture retention plate via the second heat insulating member, so that the membrane electrode assembly and the moisture retention The temperature difference with the plate can be reduced. Therefore, by satisfying ⁇ Zio ⁇ ⁇ Zio, the output characteristics of the fuel cell can be further improved.
• the obtained paste was applied to porous carbon paper as an anode gas diffusion layer to obtain an anode catalyst layer having a thickness of 100 m.
• Perfluorocarbon sulfonic acid solution concentration of 20% by weight of perfluorocarbon sulfonic acid
• water and water as a dispersion medium on carbon black carrying catalyst particles (Pt) for power sword Methoxypropanol
• Pt catalyst particles
• a perfluorocarbon sulfonic acid membrane having a thickness of 50 ⁇ m and a water content of 10 to 20% by weight (trade name) A nafion membrane (manufactured by DuPont) was placed and subjected to hot pressing to obtain a membrane electrode assembly (MEA) of 30 mm ⁇ 30 mm.
• an anode current collector having a thickness of 100 ⁇ m, in which an Au foil was bonded to a PET substrate, was laminated.
• a force sword current collector with a thickness of 100 ⁇ m, in which an Au foil was bonded to a PET substrate, was laminated on the force sword gas diffusion layer of the membrane electrode assembly.
• a 200 ⁇ m-thick silicone rubber sheet was prepared as a gas-liquid separation membrane.
• a gas permeation hole is provided at a position facing the oxidant inlet of the cover as shown in Fig. 2 described above, and the thermal conductivity is 0.25 [WZ (m ' K)], a 2 mm thick PEEK plate was prepared.
• the obtained membrane electrode assembly is combined with the moisture retention plate, the gas-liquid separation membrane, and the first heat insulating member to have the structure shown in Figs.
• Direct internal vaporization type A methanol fuel cell was built.
• the fuel tank was supplied with pure methanol with a purity of 99.9% by weight.
• Example 2 The same as described in Example 1 above, except that the second heat insulating member is laminated on the anode current collector and the force sword current collector on the membrane electrode assembly instead of the first heat insulating member.
• an internal vaporization type direct methanol fuel cell according to the second embodiment having the structure shown in FIG. 3 was assembled.
• the second heat insulating member has a thermal conductivity of 0.01 [WZ (m.K)], a thickness of lmm,
• the second heat insulating member is laminated on the anode current collector and the force sword current collector on the membrane electrode assembly of the fuel cell of Example 1, and has the structure shown in FIG.
• An internal vaporization type direct methanol fuel cell was assembled.
• As the second heat insulating member the same type as described in Example 2 was used.
• the relationship of ⁇ ⁇ ⁇ 25 holds between the thermal conductivity ⁇ of the first thermal insulating member and the thermal conductivity of the second thermal insulating member, and ⁇
• An internal vaporization type direct methanol fuel cell is constructed in the same manner as described in Example 1 except that the first heat insulating member is installed on all surfaces including the fuel tank 10 to the cover 17. I made it.
• Example 1 in which the first heat insulating member is disposed on the outer surface of the cover.
• Example 2 in which the fuel cell output characteristics of Examples 1 and 3 are the second heat insulating member disposed in the anode current collector and the force sword current collector. Compared with the output characteristics of fuel cells
• the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the spirit of the invention in an implementation stage.
• Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components such as all the components shown in the embodiment may be deleted. Furthermore, constituent elements over different embodiments may be appropriately combined.
• the fuel cell is configured to have a fuel storage section below the membrane electrode assembly (MEA).
• MEA membrane electrode assembly
• a flow path is disposed between the fuel storage section and the MEA, and the fuel cell is configured.
• the liquid fuel in the fuel reservoir may be supplied to the MEA through the flow path.
• a passive type fuel cell has been described as an example of the configuration of the fuel cell main body.
• the present invention can also be applied to this. Even with these configurations, the same effects as described above can be obtained.

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• 2007
  • 2007-01-24 EP EP07707343A patent/EP1981111A4/en not_active Withdrawn
  • 2007-01-24 JP JP2007555981A patent/JPWO2007086432A1/ja active Pending
  • 2007-01-24 WO PCT/JP2007/051096 patent/WO2007086432A1/ja not_active Ceased
  • 2007-01-29 TW TW096103188A patent/TW200746524A/zh not_active IP Right Cessation
• 2008
  • 2008-07-28 US US12/180,804 patent/US20090017353A1/en not_active Abandoned

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