JP2002117870A - Field plate for fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a field plate which can supply fuel gas and oxygen gas uniformly, while removing reaction generating water positively and preventing a large pressure loss of the supply gas and a breakage of a field plate by flow path resistance. SOLUTION: The gas flow path is formed in a space of an approximately square shape enclosed by a side-wall 11 of a field plate 1. A gas supply opening 12 is made in one side of the diagonal of the square concerned, and a gas exhaust opening 13 is made in the other side (this diagonal line is hereafter called as an axis of line symmetry). The gas supply opening 12 and the gas exhaust opening 13 are formed in a coaxial to the axis of line symmetry. Two or more protrusions 14, which divide the gas flow in order, are arranged by line symmetry to the axis of line symmetry, and the gas flow path is specified, in the space enclosed by the side-wall 11. The gas flow path domain which forms line symmetry shape to the axis of the line symmetry corresponding to the electrochemical activity domain of the electrode, is formed, by the gas flow path, the gas supply opening 12, and the gas exhaust opening 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field plate used for a solid polymer electrolyte fuel cell.

[0002]

2. Description of the Related Art A fuel cell utilizes electric energy among electric energy and heat energy generated by an electrochemical reaction of generating a compound (water) from a fuel gas (mainly hydrogen) and oxygen. A solid polymer electrolyte fuel cell (PEFC) is a fuel cell using a proton-conductive solid polymer electrolyte membrane. A fuel electrode serving as a negative electrode and an oxygen electrode serving as a positive electrode are arranged with the proton conductive membrane interposed therebetween, a fuel gas such as hydrogen gas is supplied to the fuel electrode side, and air or oxygen gas is supplied to the oxygen electrode side. Electric power can be extracted by causing an electrochemical reaction.

A solid polymer electrolyte fuel cell has a field plate for supplying a fuel gas to a fuel electrode side and a field plate for supplying an oxygen gas to an oxygen electrode side. Water is generated at the oxygen electrode during the electrochemical reaction between the fuel gas and the oxygen gas supplied via the field plate. For this reason, the generated water blocks the flow path of oxygen gas formed in the field plate,
This may cause a decrease in output of oxygen gas or instability.

[0004] In order to prevent such a decrease in output due to the reaction water, various flow path shapes for removing the reaction water from the field plate have been proposed. For example, U.S. Pat. No. 4,769,297 describes a method in which a plurality of protrusions are formed on a field plate to form gas channels in a lattice shape. 7-3
Japanese Patent Application Publication No. 788 describes that a plurality of linear gas flow paths are formed so as to be parallel to each other. Japanese Patent Application Laid-Open No. 10-106594 describes a combination of a lattice-shaped flow path and a linear gas flow path. Also,
U.S. Pat. No. 4,988,583 and JP-A-11-283
Japanese Patent No. 639 describes that one single meandering gas flow path is formed.

[0005]

Each of these channel shapes has advantages and disadvantages. For example, US Pat.
In the grid-like flow path shape described in the specification of Japanese Patent No. 297, it is difficult for reaction product water to accumulate so as to close the flow channel, but it is not possible to positively remove the reaction product water. In addition, since the fuel gas and the oxygen gas cannot be diffused, the characteristics may vary in the electrode surface, and the output may decrease or fluctuate during long-term use.

[0006] Further, in a form described in Japanese Patent Application Laid-Open No. 10-106594, in which a straight flow path or a combination of a straight flow path and a lattice flow path is used, a uniform supply of fuel gas or oxygen gas is provided. And it is difficult to remove the reaction product water.

In the configuration described in US Pat. No. 4,988,583, in which a gas supply port and a gas discharge port are connected by one meandering gas flow path, uniform supply and reaction of fuel gas and oxygen gas are performed. Although the generated water can be easily removed, the pressure loss of the supply gas increases due to the flow path resistance, and a heavy load is applied to the gas supply system. Further, the pressure of the supplied gas easily causes the field plate to be damaged.

Accordingly, the present invention actively removes the reaction water and uniformly supplies fuel gas and oxygen gas while preventing a large pressure loss of the supply gas and breakage of the field plate due to flow path resistance. It is intended to provide a field plate that can be used.

[0009]

In order to achieve the above-mentioned object, the present invention provides a method of contacting one of a pair of electrodes sandwiching a solid electrolyte membrane with a shape corresponding to an electrochemically active region of the contacting electrode. There is a gas supply port for supplying gas, a gas discharge port for discharging the supplied gas, and a gas flow path communicating with the gas supply port and the gas discharge port on the side facing the contacting electrode. In the fuel electrode field plate having the formed gas passage region, the outer shape of the gas passage region has a line-symmetrical shape, and the gas supply port and the gas outlet are coaxially arranged on a line-symmetric axis. A fuel cell in which a plurality of convex portions for sequentially dividing a gas flow supplied in a direction of a line of symmetry from the gas supply port are arranged in the gas passage region, and the plurality of convex portions define the gas passage; We provide field plates for In this fuel cell field plate, fuel gas or oxygen gas is supplied from a gas supply port to a gas flow path, is sequentially divided by a convex portion in the gas flow path, and is finally discharged from a gas discharge port. Gas inlet, gas outlet,
The outer shape of the gas flow path region formed by the gas flow path is a line symmetric shape, and the gas supply port and the gas discharge port are coaxially arranged on the line symmetric axis. It flows almost uniformly throughout. Since the gas flow area corresponds to the electrochemically active area of the contacting electrode, the electrochemical reaction occurs almost uniformly in the entire electrochemically active area of the electrode.

[0010] It is preferable that the arrangement pattern of the projections is line-symmetric with respect to the axis of line symmetry. In such a fuel cell field plate, since the fuel gas or the oxygen gas is sequentially divided in a gas flow path by the convex portions in a line-symmetric manner, the gas flow does not become uneven.

Further, the projection may have a quadrangular prism shape, a cylindrical shape, or a hemispherical shape.

It is preferable that the outer shape of the gas passage region is an n-sided polygon (n is an even number of 4 or more), and the gas supply port and the gas discharge port are located on a diagonal line of the n-sided polygon. . In such a fuel cell field plate, the fuel gas and the oxygen gas are supplied from the gas supply port, that is, the n-sided corner, which is the outer shape of the gas flow path region, and are supplied from the n-sided side. There is no gas flow stagnation at the corners as would occur in some cases.

It is preferable that a plurality of gas supply ports and a plurality of gas discharge ports are formed in addition to the gas supply port and the gas discharge port coaxially arranged on the line-symmetric axis. In such a fuel cell field plate, the fuel gas and oxygen gas are
Since it is supplied from multiple places and discharged from multiple places,
It flows uniformly throughout the gas flow path region.

Further, each of the plurality of gas supply ports and gas discharge ports formed in addition to the gas supply port and the gas discharge port arranged on the line symmetric axis is line symmetric with respect to the line symmetric axis. It is preferred to be located at In such a fuel cell field plate, the fuel gas or oxygen gas is
Since the gas is supplied to and discharged from the gas flow path in a symmetrical manner, the gas flow is not biased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A field plate according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of a solid polymer electrolyte fuel cell. As shown in the figure, the solid polymer electrolyte fuel cell has a solid polymer electrolyte membrane 2 (hereinafter simply referred to as “electrolyte membrane 2”) sandwiched between a fuel electrode 3 and an oxygen electrode 4 and further outside each electrode. And the field plate 1 is arranged in the first position.

The point that both the field plate 1 on the fuel electrode 3 side and the field plate 1 on the oxygen electrode 4 side should prevent the pressure loss of the supply gas due to the flow path resistance and make the supply of the supply gas uniform throughout the flow path. Common. Therefore, in the present embodiment, the field plates 1 on the fuel electrode 3 side and the oxygen electrode 4 side have the same shape. Hereinafter, the field plate 1 on the oxygen electrode 4 side will be described.

A gas flow path region is formed on the surface of the field plate 1 on the oxygen electrode 4 side. The gas flow path area
A gas supply port, a gas discharge port, and a gas flow path communicating with the gas supply port and the gas discharge port;
4. Since the field plate 1 also has a function as a current collector, it is formed of a conductive material such as tantalum, niobium, and carbon.

In the present embodiment, as the electrolyte membrane 2,
A film made of polyhydroxylated fullerene (commonly called fullerenol) is used. Films formed from polyhydroxy fullerenes are more excellent in film-forming properties than those formed from perfluorosulfonic acid resin, and do not require the interposition of water molecules for proton conduction. Are not required, and the operating temperature range is as wide as -40 ° C to 160 ° C.

Next, the shape of the field plate 1 of the present embodiment will be described in detail. FIG. 2 shows a front view of the field plate 1 as viewed from the oxygen electrode 4 side.

The field plate 1 has a side wall 11 formed along its outer peripheral surface. The upper surface of the side wall 11 makes surface contact with the oxygen electrode 4. An internal space partitioned by the field plate 1, the side wall 11, and the oxygen electrode 4 in a surface-contact state is a gas flow path region for oxygen gas. The side wall 11 defines a gas flow path region in a substantially square shape, and this substantially square shape corresponds to the electrochemically active region of the oxygen electrode 4.

A gas supply port 12 is formed at one corner on one diagonal of the square formed by the side wall 1, and a gas discharge port 13 is formed at the other corner. The outer shape of the gas flow path region including the gas supply port 12 and the gas discharge port 13 is line-symmetric with respect to a line connecting the gas supply port 12 and the gas discharge port 13 (hereinafter, referred to as a “line symmetric axis”). In other words, the gas supply port 1
2 and the gas outlet 13 are coaxially arranged on a line symmetry axis.

The gas supply port 12 supplies gas into the gas passage area along the axis of symmetry, and the gas discharge port 13 exhausts gas from the gas passage area along the axis of symmetry. That is, the oxygen gas is supplied into the gas flow path region in the field plate 1 along the direction of the arrow shown in FIG. 2, and is also discharged along the direction of the arrow.

In a region surrounded by the side wall 11, a plurality of quadrangular prism-shaped protrusions 14 whose upper surfaces are in contact with the oxygen electrode 4 are formed, and the protrusions 14 and the side walls 11 define a gas flow path.
The protrusions 14 are arranged so as to sequentially divide the gas flow supplied from the gas supply port 12 from the upstream side to the downstream side. Specifically, the protrusions 14 are provided in a protruding manner in an array pattern that is line-symmetric with respect to the axis of line symmetry. Multiple convex portions 14
Among them, a specific convex portion, for example, the convex portion 14a, and two downstream convex portions, for example, the convex portions 14b, 1
4c, these three convex portions 14a, 14b,
The triangle connecting the centers of 14c is a substantially equilateral triangle, and the protrusion 1
The line connecting 4b and 14c is perpendicular to the line symmetry axis.

Next, the gas flow is sequentially diverted by the convex portions 14.
FIG. The direction of gas flow is outlined in the figure.
Indicated by arrows. The gas supplied from the gas supply port 12 is
3 flows in the direction of the mark A, and the first-stage convex portion 14 in FIG.₁Collide with
Then, as shown by the arrow B, the flow is divided in two directions. And
The gas diverted in two directions passes through the two convex portions 14 of the second stage. ₂
Respectively, and after the collision, further diverges in two directions and the arrow C
Proceed in the direction of. Further, the gas that has proceeded in the direction of arrow C
Third-stage projection 14₃In the direction of arrow D
And divert. Thus, the gas is supplied from the gas supply port 12.
Oxygen gas in the horizontal direction (the direction perpendicular to the target axis)
To the gas outlet 13 while diffusing toward the gas outlet 13. Sideways
The advancing gas flow is also eventually reflected by the side wall 11 and again exhausted.
Go to Exit 13. As a result, the oxygen gas is
It will spread almost uniformly throughout the interior.

The field plate 1 as described above
The operation of a fuel cell constituted by providing the fuel cell on the fuel electrode 3 side and the oxygen electrode 4 side will be described.

First, oxygen gas is supplied to the electrochemically active region of the oxygen electrode 4 via the field plate 1 on the oxygen electrode 4 side. Further, hydrogen gas is supplied to the electrochemically active region of the fuel electrode 3 through the field plate 1 on the side of the fuel electrode 3.

When hydrogen gas is supplied to the fuel electrode 3, hydrogen is ionized and electrons are emitted to the fuel electrode 3, and protons (H ⁺ ) are generated via the electrolyte membrane 2 by the oxygen electrode 4.
Supplied to In the oxygen electrode 4, protons and oxygen, and furthermore, electrons arriving from the fuel electrode 3 via the fuel electrode side field plate 1 and the load cause an electrochemical reaction to generate water. At this time, since the oxygen gas and the hydrogen gas are almost uniformly diffused in the gas flow path regions of the respective field plates 1, the ionization of hydrogen and the generation reaction of water are performed in the electrochemically active regions in the respective electrodes. In this case, the power generation is performed almost uniformly, and efficient power generation becomes possible.

The water generated by this electrochemical reaction is also uniformly generated throughout the oxygen electrode 4, but the reaction product water is reliably removed by the oxygen gas flowing at a substantially uniform flow rate in the opposing field plate 1. can do.

The field plate 1 according to the first embodiment of the present invention has an electrochemically active electrode area of 46.45 cm ² and a flow rate of oxygen gas (air) of 2.
FIGS. 4 to 6 show the results of calculating the flow velocity distribution at 5.012 cm ³ / s.

FIG. 4 shows a flow rate of 98 cm / s to 147 cm.
FIG. 5 shows a flow rate of 49 cm / s to 98 cm.
FIG. 6 shows the flow rate of 6 cm / s to 49 cm / s.
The respective regions of s are shown.

From these figures, it can be seen that, except for the vicinity of the gas supply port 12 and the gas discharge port 13, the gas flow rate is substantially uniform over the entire gas flow path. Thus, according to the field plate 1 of the present embodiment, the fuel gas or the oxygen gas can be uniformly supplied to the entire electrochemically active region of the fuel electrode 3 or the oxygen electrode 4, and efficient power generation can be achieved. It can be carried out. Further, there is no stagnation of the gas flow over the entire gas flow path region, and water generated on the oxygen electrode 4 side can be reliably removed over the entire gas flow path region.

As a comparative example, for a conventional field plate 201 in which channels are formed in a grid pattern, the electrochemically active electrode area is 46.45 cm ^2, and the flow rate of oxygen gas (air) is 25.45 cm ² . The flow velocity distribution at 012 cm ³ / s was calculated.

FIG. 7 shows a flow rate of 354 cm / s to 531 c.
FIG. 8 shows a flow rate of 177 cm / s to 35 m / s.
FIG. 9 shows a flow rate of 0 cm / s to 17 cm.
The region of 7 cm / s is shown.

As is apparent from these figures, at the position facing the gas supply direction from the gas supply port 212,
The flow velocity is extremely high. Next, at a position where the gas flow from the gas supply port 212 in the gas supply direction collides with the side surface to the gas discharge port 213, the flow velocity is somewhat high. Is relatively slow. As a result, the field plate 201 in which the lattice-shaped flow path is formed
It can be seen that fuel gas or oxygen gas cannot be supplied uniformly. Further, since the gas flow velocity is not uniform, the gas flow stagnates, and the compound (water) generated on the oxygen electrode side cannot be reliably removed over the entire flow path.

As still another comparative example, the conventional field plate 301 in which one meandering channel is formed has an electrochemically active electrode area of 46.45 cm ^2.
And the flow rate of oxygen gas (air) is 25.012 cm ³ /
The pressure distribution of the gas flow when s was calculated.

FIG. 10 shows a pressure of 2800 dyne / cm ^2.
Or a region of 3105dyne / cm ^2, 11, the pressure 1800dyne / cm ² to 2800dyne / c
an area of m ^2, FIG. 12 is a pressure 1000dyne / cm
An area of ² to 1800dyne / cm ^2, 13,
Pressure 250 dyne / cm ^{2 to} 1000 dyne / c
an area of m ^2, FIG. 14, respectively the region of the pressure 0dyne / cm ² to 250dyne / cm ^2.

As apparent from these figures, the pressure near the gas supply port 312 is extremely high,
13, the pressure decreases rapidly, and the difference between the pressure near the gas supply port 312 and the pressure near the gas discharge port 313 is very large. This indicates that the pressure loss of the supply gas due to the flow path resistance is large.

In the above calculation, the field plate 1
Is 35 dyne / cm ² , the maximum and minimum gas pressure difference in the field plate 201 is 310 dyne / cm ² , and the maximum and minimum gas pressure difference in the field plate 301 is 3105 dyne.
/ Cm ² . The larger the maximum / minimum gas pressure difference, the greater the pressure loss of the supply gas due to the flow path resistance, which imposes a heavy load on the gas supply system and tends to cause damage to the field plate itself. Therefore, the field plate 1 of the present invention is
It can be seen that the pressure loss of the supply gas due to the flow path resistance is smaller than that of the field plate 301 and the field plate 301, so that a large load is not applied to the gas supply system and the field plate itself is hardly damaged.

A field plate according to a second embodiment of the present invention will be described with reference to FIG. FIG.
Is a front view of the field plate 101 as viewed from the oxygen electrode side.

The field plate 101 has a side wall 111 whose upper surface is in contact with the oxygen electrode 4 so as to surround the outer shape.
Are formed, and a gas flow path for supplying oxygen gas to a space surrounded by the side wall 111 is formed. Side wall 111
Defines the outer shape of the gas flow path to be substantially square,
A plurality of gas supply ports 1 are provided on one side of
12, 112a, 112b, 112c, 112d are formed, and gas outlets 113, 113a, 11
3b, 113c and 113d are formed.

Gas passages defined in the side wall 111, gas supply ports 112, 112a, 112b, 112c, 112
d, gas outlets 113, 113a, 113b, 113
By c and 113d, a gas flow path region having a shape corresponding to the electrochemically active region of the oxygen electrode is formed. The outer shape of the gas flow path region includes a gas supply port 112 and a gas discharge port 113.
(Hereinafter referred to as “axis of symmetry”). That is, the gas supply ports 112a, 112b, 112
c, 112d and gas outlets 113a, 113b, 113
c and 113d are arranged in line symmetry with respect to the axis of line symmetry. In addition, gas supply ports 112, 112a, 112b,
112c and 112d and gas outlets 113, 113a,
113b, 113c and 113d are coaxially arranged with respect to an axis extending in a direction parallel to the axis of symmetry. Gas supply ports 112, 112a, 112b, 112
c, 112d supply gas along the line-symmetric axis direction,
Gas outlets 113, 113a, 113b, 113c, 1
13d discharges gas along the axis of line symmetry. That is, the oxygen gas is supplied to the flow path in the field plate 101 along the direction of the arrow shown in FIG. 15, and is also discharged from the flow path along the direction of the arrow.

In the region surrounded by the side wall 111, a plurality of square column-shaped protrusions 114 whose upper surfaces are in contact with the oxygen electrode are formed. A gas flow path is defined. The convex portion 114 has a gas supply port 112, 112a, 112b, 112c, 11
The gas streams supplied from 2d are arranged so as to be sequentially divided. Further, the arrangement pattern of the convex portions 114 is line-symmetric with respect to the line-symmetric axis. Focusing on the protrusions 114a, 114b, 114c of the protrusions 114, the triangle connecting the centers of these three protrusions 114a, 114b, 114c is a substantially equilateral triangle, and the line connecting the protrusions 114b, 114c is Perpendicular to the axis of symmetry.

Field plate 1 of the first embodiment
In the same manner as the gas flow is sequentially divided by the convex portions 14 formed in the above, that is, in the same manner as shown in FIG.
The gas flow is sequentially split by the convex portion 114 of the present embodiment. Thus, the gas supply ports 112, 112a, 1
The fuel gas or oxygen gas supplied from 12b, 112c, 112d is diffused almost uniformly in the flow path.

Field plate 101 of the present embodiment
According to the gas supply ports 112, 112a, 112b, 1
12c, 112d and gas outlets 113, 113a, 1
Since a plurality of 13b, 113c, and 113d are formed and arranged in line symmetry with respect to a line symmetry axis, fuel gas or oxygen gas can be efficiently and more uniformly supplied into the flow path.

The field plate according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the above-described embodiment, the convex portion has a rectangular column shape.
Various shapes such as a hemisphere, a truncated square pyramid, and a truncated cone can be used.

The outer shape of the gas flow path region formed in the field plate is not limited to a square, but may be an n-gon (n is an even number of 4 or more) or a circle.

In the above-described embodiment, hydrogen gas is supplied as a fuel, but a direct type in which alcohol such as methanol or other fossil fuels are supplied in a liquid or gas state can also be employed. In that case, protons are obtained from the fuel material by the catalyst at the fuel electrode.

The polyhydric fullerene hydroxide used as the material of the electrolyte membrane 2 has a fullerene molecule as a parent as shown in FIG. 16 and a hydroxyl group introduced into its constituent carbon atoms. However, the parent is not limited to the fullerene molecule. Any carbonaceous material containing carbon as a main component may be used. This carbonaceous material includes
Regardless of the type of carbon-carbon bond, carbon atoms are carbon clusters, which are aggregates formed by bonding several to hundreds of carbon atoms, and tubular carbonaceous materials (commonly known as carbon nanotubes). Good. The former carbon cluster includes
Various carbon clusters (Fig. 17) having a closed surface structure similar to spheres or long spheres composed of a large number of carbon atoms (Fig. 17), or a part of those sphere structures are missing, Includes carbon clusters with open ends (FIG. 18), carbon clusters with a diamond structure in which most of the carbon atoms are SP3 bonded (FIG. 19), and carbon clusters in which these clusters are variously bonded (FIG. 20). You may be.

The group to be introduced into this kind of base is not limited to a hydroxyl group, but may be any proton-dissociable group represented by -XH, more preferably -YOH. Here, X and Y are arbitrary atoms or atomic groups having a divalent bond, H is a hydrogen atom, and O is an oxygen atom. Specifically, in addition to the -OH, a hydrogen sulfate ester group -OSO ₃
H, carboxyl group -COOH, other _-SO 3 H, -O
It is preferably any of PO (OH) ₂ .

In any of the above cases, humidification is not required for proton conduction, and the effect of the fuel cell used in the above embodiment remains unchanged.

[0051]

According to the field plate of the first aspect, the outer shape of the gas flow path forming region is line-symmetric,
A gas supply port for supplying gas along the axis of symmetry and a gas outlet for discharging gas along the axis of symmetry are coaxially arranged on the axis of symmetry, and the gas flows supplied from the gas supply ports are sequentially arranged. Since a gas flow path is formed by arranging a plurality of shunted convex portions, fuel gas or oxygen gas can be uniformly supplied to the surface of the fuel electrode or oxygen electrode, and efficient power generation can be performed. . In addition, stagnation of the gas flow can be prevented, and the compound (water) generated on the oxygen electrode side can be reliably removed over the entire gas flow path.

According to the field plate of the second aspect, since the projections are arranged symmetrically with respect to the axis of symmetry, the fuel gas or the oxygen gas can be uniformly supplied into the flow path without bias. .

According to the field plate of the third to fifth aspects, since the convex portion has a quadrangular prism shape, a cylindrical shape, or a hemispherical shape, it is easy to manufacture the field plate, and it is possible to divide the gas flow evenly. Can be.

According to the field plate of the sixth aspect, the outer shape of the gas flow path region has an n-gon shape (n is an even number of 4 or more), and the gas supply port and the gas discharge port are on a diagonal line of the n-gon shape. The side walls that define the gas flow passage area adjacent to the gas supply port and the gas discharge port are not orthogonal to the axis of symmetry, and the side wall portion adjacent to the gas supply port opens toward the gas discharge port. The side wall portion adjacent to the gas discharge port is open toward the gas supply port. Therefore, stagnation of the gas flow in the lateral direction of the gas supply port and the gas discharge port can be prevented.

According to the field plate of the present invention, a plurality of gas supply ports and gas discharge ports are formed in addition to the gas supply ports and gas discharge ports arranged on the axis of symmetry.
Regardless of the outer shape of the gas flow path region, the fuel gas or the oxygen gas can be efficiently supplied into the flow path and discharged from the flow path.

According to the field plate of the present invention, a plurality of gas supply ports and gas discharge ports formed in addition to the gas supply port and the gas discharge port arranged on the line symmetric axis have the line symmetric axis. Since the fuel gas or oxygen gas is arranged symmetrically with respect to the center, the fuel gas or oxygen gas can be efficiently and uniformly supplied into the flow path.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a fuel cell using a field plate according to a first embodiment of the present invention.

FIG. 2 is a front view showing the field plate according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a state where a gas flow is divided by a convex portion of a field plate according to the first embodiment of the present invention.

FIG. 4 is a view showing a region of a flow rate of 98 cm / s to 147 cm / s in the field plate according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an area of a flow rate of 49 cm / s to 98 cm / s in the field plate according to the first embodiment of the present invention.

FIG. 6 is a view showing a region of a field plate having a flow velocity of 6 cm / s to 49 cm / s in the field plate according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a region at a flow rate of 354 cm / s to 531 cm / s in a field plate in which flow paths are formed in a grid.

FIG. 8 is a diagram showing a region at a flow velocity of 177 cm / s to 354 cm / s in a field plate in which flow paths are formed in a grid.

FIG. 9 is a diagram showing a region at a flow velocity of 0 cm / s to 177 cm / s in a field plate in which flow paths are formed in a grid pattern.

FIG. 10 shows a pressure of 2800 dyne / cm ^{2 to 2} in a field plate in which one meandering channel is formed.
Shows a region of 800dyne / cm ^2.

FIG. 11 shows a pressure of 1800 dyne / cm ^{2 to 2} in a field plate in which one meandering channel is formed.
Shows a region of 800dyne / cm ^2.

FIG. 12 shows a pressure of 1000 dyne / cm ^{2 to} 1 in a field plate in which one meandering channel is formed.
Shows a region of 800dyne / cm ^2.

FIG. 13 shows a pressure of 250 dyne / cm ^{2 to} 10 in a field plate in which one meandering channel is formed.
Shows a region of 00dyne / cm ^2.

FIG. 14 shows a pressure of 0 dyne / cm ^{2 to} 250 d in a field plate in which one meandering channel is formed.
The figure which shows the area | region of yne / cm < ² >.

FIG. 15 is a front view showing a field plate according to a second embodiment of the present invention.

FIG. 16 is a molecular structure diagram showing fullerene constituting a proton conductor used for a solid electrolyte membrane of a fuel cell using a field plate according to the first embodiment of the present invention.

FIG. 17 shows a sphere or a long sphere, or a closed surface similar thereto, constituting a proton conductor used in a solid electrolyte membrane of a fuel cell using a field plate according to the first embodiment of the present invention. FIG. 2 is a molecular structure diagram showing various carbon clusters having a structure.

FIG. 18 is a diagram showing a structure in which a part of a sphere structure constituting a proton conductor used for a solid electrolyte membrane of a fuel cell using a field plate according to the first embodiment of the present invention is missing and opened in the structure. Molecular structure diagram showing a carbon cluster having an end.

FIG. 19 is a diagram illustrating a proton conductor used in a solid electrolyte membrane of a fuel cell using a field plate according to the first embodiment of the present invention.
FIG. 4 is a molecular structure diagram showing a carbon cluster having a P3-bonded diamond structure.

FIG. 20 shows carbon clusters in which a plurality of clusters are variously combined, which constitute a proton conductor used for a solid electrolyte membrane of a fuel cell using a field plate according to the first embodiment of the present invention. Molecular structure diagram.

[Explanation of symbols]

 1, 101 field plate 12, 112 gas supply port 13, 113 gas discharge port 14, 114 convex portion

Claims (8)

[Claims] 1. A gas which is in contact with one of a pair of electrodes sandwiching a solid electrolyte membrane and has a shape corresponding to an electrochemically active region of the contacting electrode, and supplies a gas to a side facing the contacting electrode. A gas supply port, a gas discharge port for discharging the supplied gas, and a fuel electrode field plate having a gas flow path region formed with a gas flow path communicating with the gas supply port and the gas discharge port, The gas flow path region has a line-symmetric outer shape, the gas supply port and the gas discharge port are coaxially arranged on a line-symmetric axis, and a gas flow supplied from the gas supply port in the line-symmetric axis direction. A field plate for a fuel cell, wherein a plurality of convex portions for sequentially dividing the gas are arranged in the gas flow path region, and the plurality of convex portions define the gas flow path. 2. The fuel cell field plate according to claim 1, wherein the arrangement pattern of the protrusions is symmetric with respect to the axis of symmetry. 3. The field plate for a fuel cell according to claim 1, wherein the projection has a quadrangular prism shape. 4. The field plate for a fuel cell according to claim 1, wherein the projection has a cylindrical shape. 5. The field plate for a fuel cell according to claim 1, wherein the projection has a hemispherical shape. 6. The gas flow path region has an n-sided outer shape (n is an even number of 4 or more), and the gas supply port and the gas outlet are located on a diagonal line of the n-sided shape. The field plate for a fuel cell according to claim 1, wherein 7. The fuel according to claim 1, wherein a plurality of gas supply ports and gas discharge ports are formed in addition to the gas supply port and gas discharge port coaxially arranged on the line-symmetric axis. Field plate for batteries. 8. A plurality of gas supply ports and gas discharge ports formed in addition to a gas supply port and a gas discharge port arranged on the line symmetry axis are each line-symmetric with respect to the line symmetry axis. 8. The field plate for a fuel cell according to claim 7, wherein the field plate is disposed at a position corresponding to the field plate.