JP5515995B2 - Fuel cell - Google Patents

Description

  The present invention relates to a fuel cell, and more particularly to a fuel cell having a fuel generating member.

  In recent years, fuel cells that take out electricity when water is generated from hydrogen and oxygen have been actively developed. Since fuel cells do not emit carbon dioxide in principle, they are not only attracting attention as a clean energy source, but they are also energy efficient because they can be extracted in principle, and they are energy-saving. By recovering the heat, the heat energy can be used, and it is expected as a trump card for solving global energy and environmental problems.

  Such fuel cells include, for example, a solid polymer electrolyte membrane using a solid polymer ion exchange membrane, a solid oxide electrolyte membrane using yttria-stabilized zirconia (YSZ), and the like as a fuel electrode (anode) and an oxidizer electrode ( A single cell structure is formed by sandwiching between the cathode and the cathode from both sides and further sandwiching the outside with a pair of separators.

JP 5-36417 A (paragraph 0019, FIG. 6) Japanese Patent Laid-Open No. 6-60888 (paragraph 0018, FIG. 2)

  In the fuel cell disclosed in Patent Document 1, a fuel gas passage for supplying a fuel gas (for example, hydrogen gas) to the fuel electrode, and an oxidant gas for supplying an oxidant gas (for example, oxygen or air) to the oxidant electrode. A flow path is formed. In such a configuration, the fuel gas is consumed as it travels through the fuel gas flow path, so the fuel gas concentration differs between upstream and downstream of the fuel gas flow path. For this reason, the electromotive force generated at the fuel electrode varies depending on the location of the fuel electrode, and the electromotive force that can be taken out as the entire fuel electrode is reduced by the influence of the low electromotive force in the fuel electrode. That is, there is a problem that the output of the fuel cell is lowered and the fuel efficiency is lowered.

  As a fuel cell which can solve such a problem, the fuel cell currently disclosed by patent document 2 is mentioned, for example. In the fuel cell disclosed in Patent Document 2, since the fuel is excessively supplied, the difference in the fuel gas concentration between the upstream side and the downstream side of the fuel gas flow path is suppressed. Further, the fuel cell disclosed in Patent Document 2 recycles fuel by re-supplying excessively discharged fuel to the fuel supply side through a reformer and a carbon dioxide removal device.

  However, since the fuel cell disclosed in Patent Document 2 requires a recycle mechanism such as a reformer or a carbon dioxide removal device, it has a problem that the fuel cell becomes large and expensive. .

  By the way, the fuel cell needs to take out the electrode to the outside of the fuel cell for connection with the load. As a matter of course, it is desirable that the electrode can be easily taken out.

  In view of the above situation, an object of the present invention is to provide a fuel cell that is small, low in cost, high in fuel efficiency, and easy to take out an electrode to the outside.

In order to achieve the above object, a fuel cell according to the present invention includes a fuel generating member, a fuel electrode, an oxidant electrode, and an electrolyte sandwiched between the fuel electrode and the oxidant electrode. A plurality of holes are provided in the fuel generating member, and an inner peripheral surface of each of the holes is a discharge surface for discharging the fuel in a planar shape, and includes the fuel electrode, the oxidant electrode, and the electrolyte. structure of the hollow structure is provided in the bore of each of the supply side of the fuel is supplied in the fuel electrode is disposed so as to face the inner circumferential surface of the hole Rutotomoni, the oxidant electrode of the oxidizing agent A supply surface to which gas is supplied is disposed in the hollow portion of the structure , and at least one end of the fuel electrode and at least one end of the oxidant electrode formed in each of the holes. The portion extends to a surface other than the inner peripheral surface of the hole of the fuel generating member. Configuration to.

  Moreover, it is preferable that the fuel electrode and the oxidant electrode formed in the same hole are electrically separated by the electrolyte.

  Furthermore, an insulating layer may be provided, and the fuel electrode and the oxidant electrode formed in the same hole may be electrically separated by the electrolyte and the insulating layer. In this case, the insulating layer may be a fuel-permeable insulating layer, and at least a part of the insulating layer may be formed between the fuel electrode and the fuel generating member.

  And an electrode layer electrically connected to at least one of an end portion of the fuel electrode and an end portion of the oxidizer electrode extending to a surface other than the inner peripheral surface of the hole of the fuel generating member. It may be.

  Moreover, it is preferable that the said hole is a through-hole.

  According to the present invention, the inner peripheral surface of each hole provided in the fuel generating member is a discharge surface that discharges the fuel in a planar shape, and the supply surface to which the fuel of the fuel electrode is supplied faces the inner peripheral surface of the hole. Since the fuel can be supplied at a uniform concentration over the entire supply surface to which the fuel of the fuel electrode is supplied, the electromotive force generated at the fuel electrode depends on the location of the fuel electrode. It will be constant without any difference. As a result, a decrease in output due to variations in electromotive force can be suppressed, and fuel efficiency can be increased.

  Further, according to the present invention, at least one end portion of the fuel electrode and at least one end portion of the oxidizer electrode formed in each hole provided in the fuel generation member are formed on the inner periphery of the hole of the fuel generation member. Since it extends to the surface other than the surface, the connection of the extraction electrode to the outside becomes easy, and the yield is improved.

It is a mimetic diagram showing a schematic structure of a fuel cell concerning one embodiment of the present invention. It is sectional drawing in the cross section AA shown in FIG. 1 of the fuel cell which concerns on one Embodiment of this invention. It is sectional drawing in the cross section BB shown in FIG. 1 of the fuel cell which concerns on one Embodiment of this invention. It is a schematic diagram which shows schematic structure at the time of the 1st process completion of the fuel cell which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view taken along a section AA shown in FIG. 4 when the first step of the fuel cell according to the embodiment of the present invention is completed. It is a schematic diagram which shows schematic structure of the fuel generation member formed using a some plate-shaped fuel generation member. It is a schematic diagram which shows schematic structure at the time of the 2nd process completion of the fuel cell which concerns on one Embodiment of this invention. FIG. 8 is a cross-sectional view taken along a section AA shown in FIG. 7 when the second step of the fuel cell according to the embodiment of the present invention is completed. It is a schematic diagram which shows schematic structure at the time of the 3rd process completion of the fuel cell which concerns on one Embodiment of this invention. FIG. 10 is a cross-sectional view taken along a section AA shown in FIG. 9 when the third step of the fuel cell according to the embodiment of the present invention is completed. It is a schematic diagram which shows schematic structure at the time of the 4th process completion of the fuel cell which concerns on one Embodiment of this invention. FIG. 12 is a cross-sectional view taken along a section AA shown in FIG. 11 when the fourth step of the fuel cell according to the embodiment of the present invention is completed. 2 is a schematic diagram showing a schematic configuration at the time of completion of the first step of the fuel cell according to Example 1. FIG. FIG. 14 is a sectional view taken along a section AA shown in FIG. 13 when the first step of the fuel cell according to Example 1 is completed. FIG. 3 is a schematic diagram showing a schematic configuration at the time when a pre-process of a second process of the fuel cell according to Example 1 is completed. FIG. 16 is a cross-sectional view taken along a cross section AA shown in FIG. 3 is a schematic diagram showing a schematic configuration at the time of completion of the second step of the fuel cell according to Example 1. FIG. FIG. 18 is a sectional view taken along a section AA shown in FIG. 17 when the second step of the fuel cell according to Example 1 is completed. 3 is a schematic diagram showing a schematic configuration at the time of completion of a third step of the fuel cell according to Example 1. FIG. FIG. 20 is a cross-sectional view taken along a section AA shown in FIG. 19 when the third step of the fuel cell according to Example 1 is completed. 6 is a schematic diagram illustrating a schematic configuration of a fuel cell according to Example 1 when a fourth step is completed. FIG. FIG. 22 is a cross-sectional view taken along a section AA shown in FIG. 21 when the fourth step of the fuel cell according to Example 1 is completed. 3 is a cross-sectional view showing a state where an external extraction electrode is joined to the fuel cell according to Embodiment 1. FIG. It is a schematic diagram which shows schematic structure of the fuel generation member formed using a some plate-shaped Mg member. 6 is a schematic diagram showing a schematic configuration at the time of completion of a first step of a fuel cell according to Example 2. FIG. FIG. 26 is a cross-sectional view taken along a section AA shown in FIG. 25 when the first step of the fuel cell according to Example 2 is completed. 6 is a schematic diagram showing a schematic configuration at the time of completion of a second step of a fuel cell according to Example 2. FIG. FIG. 28 is a cross-sectional view taken along section AA shown in FIG. 27 when the second step of the fuel cell according to Example 2 is completed. 6 is a schematic diagram showing a schematic configuration at the time of completion of a third step of a fuel cell according to Example 2. FIG. FIG. 30 is a cross-sectional view taken along a section AA shown in FIG. 29 when the third step of the fuel cell according to Example 2 is completed. 6 is a schematic diagram showing a schematic configuration at the time of completion of a fourth step of a fuel cell according to Example 2. FIG. FIG. 32 is a cross-sectional view taken along a section AA shown in FIG. 31 when the fourth step of the fuel cell according to Example 2 is completed. 6 is a schematic diagram showing a schematic configuration after formation of an external extraction electrode of a fuel cell according to Example 2. FIG. FIG. 34 is a cross-sectional view taken along a section AA shown in FIG. 33 after forming an external extraction electrode of the fuel cell according to Example 2.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described later. For example, in the embodiment described later, the hole provided in the fuel generating member is a through hole, but the present invention can be realized even if the hole is closed at one end.

  A configuration of a fuel cell according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a schematic configuration of a fuel cell according to an embodiment of the present invention. 2 is a cross-sectional view of the fuel cell according to one embodiment of the present invention, taken along section AA shown in FIG. 1, and FIG. 3 is a cross-sectional view of the fuel cell according to one embodiment of the present invention shown in FIG. It is sectional drawing in BB.

  A fuel cell 10 according to an embodiment of the present invention includes a fuel generating member 1, an electrolyte membrane 2, a fuel electrode (anode) 3, and an oxidant electrode (cathode) 4.

  The fuel generating member 1 is provided with a plurality of through holes. The inner peripheral surface of each through hole is a discharge surface that discharges the fuel in a planar shape. An MEA (Membrane Electrode Assembly) structure in which the fuel electrode 3 and the oxidant electrode 4 are bonded to both surfaces of the electrolyte membrane 2 is provided in each through hole. The MEA structure has a hollow structure in which the inner side is the oxidant electrode 4 and the outer side is the fuel electrode 3, and oxidant gas is supplied to the hollow part. The MEA structure is arranged so that the supply surface to which the fuel of the fuel electrode 3 is supplied faces the inner peripheral surface of the through hole. With such a configuration, a fuel having a uniform concentration can be supplied over the entire supply surface to which the fuel of the fuel electrode 3 is supplied. Therefore, the electromotive force generated at the fuel electrode 3 depends on the location of the fuel electrode 3. It will be constant without any difference. As a result, a decrease in output due to variations in electromotive force can be suppressed, and fuel efficiency can be increased. Incidentally, the supply surface to which the fuel of the fuel electrode 3 is supplied may be in close contact with the inner peripheral surface of the through hole as shown in FIGS. 2 and 3, and unlike in FIGS. You may leave | separate from a surrounding surface.

  Further, at least one end portion of the fuel electrode 3 and at least one end portion of the oxidizer electrode 4 formed inside each through-hole are on surfaces other than the inner peripheral surface of the through-hole of the fuel generating member 1. It is extended. With such a configuration, the connection of the extraction electrode to the outside is facilitated, and the yield is improved.

  Here, the fuel is, for example, hydrogen or methanol, and the oxidant gas is a gas containing oxygen, for example, air.

  In the fuel cell 10 according to an embodiment of the present invention, fuel is supplied from a discharge surface for discharging the fuel of the fuel generating member 1 into a planar shape to a supply surface to which fuel of the fuel electrode 3 is supplied. Electric power is generated by an electrochemical reaction caused by supplying an oxidant gas from the portion to the oxidant electrode 4.

  As the fuel generating member 1, for example, a material that generates fuel by a chemical reaction (such as iron or magnesium alloy) can be used. For example, a material that can desorb hydrogen by the molecular structure (such as carbon nanotube) is used. However, the present invention is not limited to these, and any device capable of generating fuel can be used. Further, the fuel generating member 1 may not only generate fuel but also be able to occlude (adsorb). In this case, the fuel generating member 1 can be used repeatedly by performing the occlusion (adsorption) operation after generating the fuel from the fuel generating member. As a material capable of storing hydrogen as a fuel, a hydrogen storage alloy based on Ni, Fe, Pd, V, Mg, or the like can be used.

  As the material of the electrolyte membrane 2, for example, a solid oxide electrolyte using stabilized yttria zirconium (YSZ) can be used. For example, Nafion (trademark of DuPont), cationic conductive polymer, anionic conductive polymer Solid polymer electrolytes such as, but not limited to, those that pass hydrogen ions, those that pass oxygen ions, and those that pass hydroxide ions can be used as fuel cell electrolytes. Any material satisfying the characteristics may be used.

  As a material of the fuel electrode 3, for example, Ni-Fe cermet or Ni-YSZ cermet can be used. Moreover, as a material of the oxidizer electrode 4, a La—Mn—O-based compound, a La—Co—Ce-based compound, or the like can be used.

  Here, it is desirable that the fuel generation speed of the fuel generation member 1 is substantially constant regardless of the position on the discharge surface where the fuel of the fuel generation member 1 is discharged in a planar shape. Specifically, thermochemical equilibrium is used. When the temperature of the fuel generating member 1 is raised or lowered, fuel corresponding to the deviation from the equilibrium state can be generated. For example, a heater (not shown) that contacts the fuel generating member 1 is provided, and fuel is generated using the heater. By making the temperature of the entire member 1 uniform, fuel can be generated at a constant speed regardless of the location.

  In addition, when there is a space between the fuel generating member 1 and the fuel electrode 3 (for example, a space in which a fuel-permeable insulating layer is formed), if chemical equilibrium is used, the fuel generating member 1 and the fuel electrode 3 The fuel generation speed of the fuel generating member 1 can also be made constant by keeping the fuel concentration at the time of battery activation in the space between them constant regardless of the location. This is due to the following phenomenon.

  If the fuel concentration at the start of the battery is constant regardless of the location, the power generated from the electrode is constant. In other words, the fuel consumption is constant regardless of the location. In this case, the chemical equilibrium is shifted due to the consumed fuel, and fuel corresponding to the shift amount is newly generated from the fuel generating member 1. Since the amount of fuel consumption is constant regardless of location, the fuel generation speed from the fuel generating member 1 is also constant regardless of location.

  Note that a method of making the fuel concentration constant at the time of starting the battery regardless of the location is, for example, when the fuel is gas or liquid, if the fuel is sealed in the space between the fuel generating member 1 and the fuel electrode 3 in advance. Good. When the fuel is gas or liquid, diffusion occurs naturally and the concentration in the enclosed space becomes constant, so that the fuel concentration can be made constant regardless of the location.

  As described above, by making the fuel generation speed of the fuel generating member 1 substantially constant regardless of the position on the discharge surface where the fuel of the fuel generating member 1 is discharged in a planar shape, variations in electromotive force are achieved. It is possible to further suppress the decrease in output due to the above, and to further increase the fuel efficiency.

  Next, an example of a method for producing the fuel cell 10 according to an embodiment of the present invention having the above-described configuration will be described with reference to FIGS.

  First, in the first step, the fuel generating member 1 having a shape as shown in FIGS. 4 and 5 is formed. 4 is a schematic diagram showing a schematic configuration of the fuel cell 10 according to an embodiment of the present invention when the first step is completed, and FIG. 5 is a diagram of the fuel cell 10 according to the embodiment of the present invention. It is sectional drawing in the cross section AA shown in FIG. 4 at the time of 1st process completion.

  4 and FIG. 5, for example, a mold for forming the shape as shown in FIGS. 4 and 5 is prepared, and the particulate fuel generating member is used as a mold. It may be realized by filling and compression molding. Alternatively, for example, the fuel generating member may be mixed with a resin material and poured into a mold, and then the resin material may be removed by heating evaporation and molded. Further, after the plate-like fuel generating members 1A to 1E shown in FIG. 6 are molded by the same method as described above, the lower joint surface of the fuel generating member 1A, the upper joint surface of the fuel generating member 1B, and the fuel generating member 1B The lower joint surface and the upper joint surface of the fuel generating member 1C, the lower joint surface of the fuel generating member 1C and the upper joint surface of the fuel generating member 1D, and the lower joint surface of the fuel generating member 1D and the upper joint surface of the fuel generating member 1E. You may make it join by an adhesive agent, heat compression, etc., respectively.

  Next, in the second step, the fuel electrode 3 having a shape as shown in FIGS. 7 and 8 is formed. 7 is a schematic diagram showing a schematic configuration at the time of completion of the second step of the fuel cell 10 according to one embodiment of the present invention, and FIG. 8 is a diagram of the fuel cell 10 according to one embodiment of the present invention. It is sectional drawing in the cross section AA shown in FIG. 7 at the time of 2nd process completion.

  At least one end (only one end in the present embodiment) of the fuel electrode 3 formed inside each through hole extends to a surface other than the inner peripheral surface of the through hole of the fuel generating member 1. To do. The fuel electrode 3 may be formed as a whole, or to a portion other than the inner peripheral surface of the through hole of the fuel generating member 1 and the surface other than the inner peripheral surface of the through hole of the fuel generating member 1. The extending part (extending part) may be formed separately.

  The fuel electrode 3 may be formed by using a film forming method such as a general vapor deposition method or a sputtering method, but dipping, chemical vapor deposition (CVD), atomic layer deposition (Atomic Layer Deposition): A film formation method such as ALD) or liquid phase deposition (LPD) is preferable because a uniform film thickness can be formed even for a complicated shape. In the second step, portions that do not require film formation are masked by a method such as photolithography.

  In the second step, a fuel-permeable insulating layer (not shown) may be formed on the surface of the fuel generating member 1 prior to the formation of the fuel electrode 3. In such a configuration, since the fuel generating member 1 and the fuel electrode 3 are electrically separated, even if the electric resistance of the fuel generating member 1 changes depending on the fuel supply state, the fuel electrode 3 is affected by the influence. There is no stable power generation. Such an insulating layer can be formed using the same method as the formation of the fuel electrode 3.

  Next, in the third step, the electrolyte membrane 2 having a shape as shown in FIGS. 9 and 10 is formed. FIG. 9 is a schematic diagram showing a schematic configuration when the third step of the fuel cell 10 according to the embodiment of the present invention is completed, and FIG. 10 shows the fuel cell 10 according to the embodiment of the present invention. FIG. 10 is a cross-sectional view taken along a cross-section AA shown in FIG. 9 when the third step is completed. The formation of the electrolyte membrane 2 can be performed using the same method as the formation of the fuel electrode 3.

  Finally, in the fourth step, the oxidant electrode 4 having a shape as shown in FIGS. 11 and 12 is formed. FIG. 11 is a schematic diagram showing a schematic configuration when the fourth step of the fuel cell 10 according to an embodiment of the present invention is completed, and FIG. 12 shows the fuel cell 10 according to the embodiment of the present invention. It is sectional drawing in the cross section AA shown in FIG. 11 at the time of 4th process completion. The oxidant electrode 4 can be formed using the same method as the formation of the fuel electrode 3.

  At least one end portion (only one end portion in the present embodiment) of the oxidant electrode 4 formed inside each through hole extends to a surface other than the inner peripheral surface of the through hole of the fuel generating member 1. Make it out. The oxidant electrode 4 may be formed as a whole, or may be formed on a portion other than the inner peripheral surface of the through hole of the fuel generating member 1 and a surface other than the inner peripheral surface of the through hole of the fuel generating member 1. You may form separately the part extended to (extension part). Further, the fuel electrode 3 and the oxidant electrode 4 formed in the same through hole are electrically separated. In the separation method, the shape of the electrolyte membrane 2 formed in the third step may be separated by covering the necessary portion of the fuel electrode 3, or the insulating layer may be formed before and after the formation of the electrolyte membrane 2. May be formed and separated by the insulating layer and the electrolyte membrane 2.

  After completion of the fourth step, the extraction electrode is connected to the outside. At least one end of the fuel electrode 3 and at least one end of the oxidant electrode 4 formed inside each through-hole. Since the portion extends to a surface other than the inner peripheral surface of the through hole of the fuel generating member 1, it is easy to connect the extraction electrode to the outside, and the yield is improved. At this time, the fuel electrode 3 and the oxidant electrode 4 may be connected by wiring, but necessary patterning is performed on the surface other than the inner peripheral surface of the through hole of the fuel generating member 1 using photolithography or the like. After that, when the extraction electrode layer is formed in a lump using vapor deposition or sputtering, the extraction electrode to the outside can be formed more easily. Further, when the fuel electrode 3 and the oxidant electrode 4 are formed, if the surface of the fuel generating member 1 other than the inner peripheral surface of the through hole is patterned in advance, the lead-out electrode can be formed more easily.

  Hereinafter, specific examples of the method for manufacturing the fuel cell 10 according to an embodiment of the present invention will be described. The present invention is not limited to the following examples.

<Example 1>
First, in the first step, iron is used as the fuel generating member 1, iron powder is filled into a mold, compression molding is performed while applying pressure with a press machine, and a fuel having a shape as shown in FIGS. 13 and 14 is generated. Member 1 was formed. 13 is a schematic diagram showing a schematic configuration when the first step of the fuel cell according to the first embodiment is completed, and FIG. 14 is a diagram when the first step of the fuel cell according to the first embodiment is completed. FIG. 13 is a sectional view taken along a section AA shown in FIG.

  Next, in the previous step of the second step, LSGM (La—Sr—Ga—Mn) was formed as an insulating layer 6 having a shape as shown in FIGS. 15 and 16 by the ALD method. FIG. 15 is a schematic diagram showing a schematic configuration at the time of completion of the second step of the fuel cell according to the first embodiment, and FIG. 16 is a diagram before the second step of the fuel cell according to the first embodiment. It is sectional drawing in the cross section AA shown in FIG. 13 at the time of completion of a process.

  Next, in the second step, one end portion of the fuel electrode 3 in which Ni-Fe cermet is formed inside each through hole by the ALD method as the fuel electrode 3 having a shape as shown in FIGS. 17 and 18. However, the film was formed so as to extend to a surface other than the inner peripheral surface of the through hole of the fuel generating member 1. FIG. 17 is a schematic diagram showing a schematic configuration when the second step of the fuel cell according to the first embodiment is completed, and FIG. 18 is a diagram when the second step of the fuel cell according to the first embodiment is completed. 17 is a cross-sectional view taken along a cross-section AA shown in FIG.

  Next, in the third step, LSGM was formed by the ALD method as the electrolyte membrane 2 having a shape as shown in FIGS. 19 and 20. FIG. 19 is a schematic diagram showing a schematic configuration when the third step of the fuel cell according to the first embodiment is completed. FIG. 20 is a diagram when the third step of the fuel cell according to the first embodiment is completed. FIG. 20 is a sectional view taken along a section AA shown in FIG. At this time, in order to electrically separate the fuel electrode 3 and the oxidant electrode 4 formed inside the same through-hole, a part of the electrolyte membrane 2 covers the fuel electrode 3 in the third step. A film was formed.

  Finally, in the fourth step, an oxidant electrode 4 formed by laminating a La—Mn—O-based material inside each through-hole by the ALD method as the oxidant electrode 4 having the shape shown in FIGS. 21 and 22. The film was formed so that one end of the fuel extended to the surface other than the inner peripheral surface of the through hole of the fuel generating member 1. 21 is a schematic diagram showing a schematic configuration when the fourth step of the fuel cell according to the first embodiment is completed, and FIG. 22 is a diagram when the fourth step of the fuel cell according to the first embodiment is completed. FIG. 22 is a sectional view taken along a section AA shown in FIG.

  After completion of the fourth step, the lead wire 5 is joined to each of the fuel electrode 3 and the oxidant electrode 4 arranged on the outermost periphery side of the fuel generating member 1 by soldering, bonding or the like to form the external extraction electrode 5 (see FIG. 23). ).

<Example 2>
First, in the first step, Mg is used as the fuel generating member 1, and after mixing Mg with the resin, filling the mold and evaporating and drying the resin by heating, a plate-like Mg as shown in FIG. Members 1A to 1E were formed. Then, the plate-like Mg members 1A to 1E were stacked and joined to form the fuel generating member 1 having a structure as shown in FIGS. FIG. 25 is a schematic diagram showing a schematic configuration when the first step of the fuel cell according to the second embodiment is completed, and FIG. 26 is a diagram when the first step of the fuel cell according to the second embodiment is completed. FIG. 25 is a sectional view taken along a section AA shown in FIG.

  Next, in the second step, the material of the fuel electrode 3 was Ni-YS cermet, and the fuel electrode 3 having a shape as shown in FIGS. 27 is a schematic diagram showing a schematic configuration when the second step of the fuel cell according to the second embodiment is completed, and FIG. 28 is a diagram when the second step of the fuel cell according to the second embodiment is completed. FIG. 27 is a sectional view taken along a section AA shown in FIG.

  Next, in the third step, YSZ was formed by the dipping method as the electrolyte membrane 2 having a shape as shown in FIGS. FIG. 29 is a schematic diagram showing a schematic configuration when the third step of the fuel cell according to the second embodiment is completed, and FIG. 30 is a diagram when the third step of the fuel cell according to the second embodiment is completed. FIG. 29 is a sectional view taken along a section AA shown in FIG. At this time, in order to electrically separate the fuel electrode 3 and the oxidant electrode 4 formed inside the same through-hole, a part of the electrolyte membrane 2 covers the fuel electrode 3 in the third step. A film was formed.

  Finally, in the fourth step, an oxidant electrode 4 formed by laminating a La—Co—Ce-based material in each through hole as an oxidant electrode 4 having a shape as shown in FIGS. 31 and 32 by dipping. The film was formed so that one end of the fuel extended to the surface other than the inner peripheral surface of the through hole of the fuel generating member 1. FIG. 31 is a schematic diagram showing a schematic configuration when the fourth step of the fuel cell according to the second embodiment is completed. FIG. 32 is a diagram when the fourth step of the fuel cell according to the second embodiment is completed. FIG. 31 is a sectional view taken along a section AA shown in FIG.

  After the completion of the fourth step, the fuel generating member 1 is coated with Au by vapor deposition to form the external extraction electrode layer 7, and then the lead wire 5 is connected by soldering, bonding or the like to form an external extraction electrode (see FIG. 33 and FIG. 33). (See FIG. 34). FIG. 33 is a schematic diagram showing a schematic configuration after the formation of the external extraction electrode of the fuel cell according to Example 2. FIG. 34 is a schematic diagram of FIG. 33 after the formation of the external extraction electrode of the fuel cell according to Example 2. It is sectional drawing in the cross section AA shown.

DESCRIPTION OF SYMBOLS 1 Fuel generating member 1A-1E Plate-shaped fuel generating member 2 Electrolyte membrane 3 Fuel electrode 4 Oxidant electrode 5 External extraction electrode 6 Insulating layer 7 External extraction electrode layer 10 Fuel cell which concerns on one Embodiment of this invention

Claims (6)

In a fuel cell comprising a fuel generating member, a fuel electrode, an oxidant electrode, and an electrolyte sandwiched between the fuel electrode and the oxidant electrode,
A plurality of holes are provided in the fuel generating member;
The inner peripheral surface of each of the holes is a discharge surface that discharges fuel in a planar shape,
A hollow structure having the fuel electrode, the oxidant electrode, and the electrolyte is provided in each of the holes,
Providing surface fuel of the fuel electrode is supplied is arranged so as to face the inner circumferential surface of the hole Rutotomoni, the hollow portion of the feed faces the structure to which oxidant gas is supplied the oxidant electrode Has been placed ,
At least one end of the fuel electrode and at least one end of the oxidant electrode formed inside each of the holes extend to a surface other than the inner peripheral surface of the fuel generating member. A fuel cell characterized by comprising:   2. The fuel cell according to claim 1, wherein the fuel electrode and the oxidant electrode formed in the same hole are electrically separated by the electrolyte. 3. With an insulating layer,
The fuel cell according to claim 2, wherein the fuel electrode and the oxidant electrode formed in the same hole are electrically separated by the electrolyte and the insulating layer. The insulating layer is a fuel permeable insulating layer;
The fuel cell according to claim 3, wherein at least a part of the insulating layer is formed between the fuel electrode and the fuel generating member.   An electrode layer electrically connected to at least one of an end portion of the fuel electrode and an end portion of the oxidizer electrode extending to a surface other than the inner peripheral surface of the hole of the fuel generating member. The fuel cell according to any one of claims 1 to 4.   The fuel cell according to claim 1, wherein the hole is a through hole.