JP5183130B2 - Fuel cell - Google Patents

Description

  The present invention relates to a fuel cell, and more particularly to a polymer electrolyte fuel cell useful as a stationary power source and a mobile power source.

  A fuel cell supplies electricity generated by electrochemically reacting a fuel gas and an oxidant gas. An important component of a fuel cell is a separator.

  The separator separates the fuel gas and the oxidant gas, has a channel structure designed to distribute the gas evenly to the diffusion layer, and induces electricity generated by the membrane / electrode assembly (MEA). It has a part.

  Separators of graphite material and metal material have been developed. Metal material separators require countermeasures against corrosion, but the metal material is formed by press forming the flow path, so it is possible to reduce costs, reduce thickness and weight, and improve output per volume. I can expect.

  Therefore, metal material separators are being developed in a wide range of fields in accordance with the needs for high density output and low cost.

  In a fuel cell, the voltage drops when current is drawn. The causes of the voltage drop are activation loss due to catalytic activity, resistance loss due to ion conduction resistance of the electrolyte membrane and resistance inside the battery, and concentration loss due to gas diffusion.

  In order to improve the battery performance, it is important to reduce these losses. In particular, in order to realize a high current density output, concentration loss due to gas diffusion becomes a problem.

  That is, in order to obtain a large amount of current, it is necessary to supply fuel gas or oxidant gas to the entire MEA and activate the electrochemical reaction over the entire reaction region.

  The technology that supplies fuel gas and oxidant gas to the entire MEA and activates the electrochemical reaction over the entire reaction region is provided with a slit-like channel that connects the channels to reduce local concentration loss. In order to prevent a decrease in the mass flow rate of the gas, it is possible to obtain stable power generation characteristics and to have a flow passage cross-sectional area distribution that increases the flow passage cross-sectional area from the end to the center of the separator. Some have improved performance degradation due to non-uniformity of current density distribution (see, for example, Patent Document 1 and Patent Document 2).

JP 2006-351222 A JP 2005-174648 A

  The fuel gas and oxidant gas necessary for the electrochemical reaction are consumed by the electrochemical reaction. When hydrogen gas is used as the fuel gas and air is used as the oxidant gas, the electrochemical reaction is expressed by the following equation.

Anode side (fuel electrode): H ₂ → 2H ⁺ + 2e (1)
Cathode side (air electrode): 4H ⁺ + O ₂ + 4e → 2H ₂ O (2)
From the above equation, on the anode side, the hydrogen gas as the fuel gas becomes hydrogen ions and electrons and is consumed at the air electrode.

  On the other hand, on the cathode side, water is generated while oxygen is consumed. The air contains about 20% of oxygen, but as oxygen consumption progresses from the inlet toward the outlet, the proportion of water vapor increases and the proportion of oxygen (partial pressure) decreases.

  Therefore, on the cathode side, it becomes difficult to supply air oxygen necessary for the electrochemical reaction from the inlet toward the outlet. Therefore, it can be said that the bottleneck in the electrochemical reaction is the supply of oxygen. The problem of oxygen supply appears to be particularly noticeable during operation under high current density conditions and high oxygen utilization rate conditions.

  This is because the oxygen can be sufficiently supplied in the vicinity of the inlet of the cathode side flow path so that the electrochemical reaction can be actively performed, but the oxygen concentration decreases as it goes to the outlet, and the oxygen is generated by the water vapor generated by the electrochemical reaction. It is thought that it becomes difficult to go to the power generation section.

  As a result, the current density is different between the vicinity of the inlet and the vicinity of the outlet, and the power generation efficiency becomes worse as it approaches the outlet.

That is, there is a difference in power generation near the entrance and the exit. This is a problem that must be solved in order to obtain a high power density current and from the viewpoint of the life of the power generation component.
In the prior art, the means for connecting the flow paths in a slit shape or the means for increasing the cross-sectional area of the flow path from the end to the center controls the flow of gas and tries to solve the concentration loss caused by gas diffusion. Is.

  However, the means for connecting the flow paths in a slit shape and the means for increasing the cross-sectional area of the flow path from the end to the center do not change the amount of oxygen consumed or the amount of water vapor generated. It does not solve the disparity in power generation near the inlet and the outlet by controlling the electrochemical reaction.

  An object of the present invention is to solve the disparity in power generation near the inlet and the outlet by controlling the electrochemical reaction by changing the amount of oxygen consumed in the electrochemical reaction and the amount of water vapor generated. .

  The fuel cell according to the present invention includes a fuel electrode having an electric induction portion that sandwiches an electrolyte layer between a fuel electrode and an oxygen electrode, forms a fuel gas flow path along the fuel electrode, and dielectrics electricity with respect to the fuel electrode. A separator and an oxygen electrode separator having an electric induction part that forms an oxidant gas flow path along the oxygen electrode and that generates electricity with respect to the oxygen electrode are provided.

  And the electric induction part of the said oxygen electrode separator is comprised by the member from which an electrical conductivity becomes large toward the exit of an oxidizing gas channel from the inlet of an oxidizing gas channel.

  Further, the electric induction part of the oxygen electrode separator has a feature that an area in contact with the oxygen electrode increases from the inlet of the oxidant gas flow path to the outlet of the oxidant gas flow path.

  In other words, the present invention provides a means for suppressing the electrochemical reaction in the vicinity of the air inlet on the cathode side of the separator and for promoting the electrochemical reaction in the vicinity of the air outlet on the cathode side. It solves the disparity in power generation near the exit.

  The means of suppressing the electrochemical reaction near the inlet and promoting it near the cathode air outlet is that the electrical conductivity is small near the inlet and near the outlet in the electric induction part of the separator to which the power generation part is connected. Apply a material with a large value.

  Alternatively, in the electrical induction part where the separator and the power generation part are connected to the means for suppressing the electrochemical reaction in the vicinity of the cathode side inlet of the separator and for promoting the electrochemical reaction in the vicinity of the cathode side air outlet, A structure having a small contact area near the entrance and a large value near the exit is applied.

  In the electrochemical reaction in the cathode side power generation unit, as shown in the formula (2), hydrogen ions passing from the electrolyte membrane, oxygen in the air flowing through the cathode side separator channel, and electrons supplied from the cathode side separator These three elements are necessary.

  In the electrical induction part where the separator and the power generation part are connected, if a material with a small electrical conductivity near the inlet and a large value near the outlet is applied, the supply of electrons necessary for the reaction near the inlet is suppressed and consumed. The amount of oxygen to be reduced is reduced, the supply of electrons is promoted near the exit, and oxygen that has not been consumed near the entrance is consumed near the exit.

  As a result, the electrochemical reaction is suppressed in the vicinity of the inlet, and the electrochemical reaction is promoted in the vicinity of the outlet, so that the power generation difference between the vicinity of the inlet and the vicinity of the outlet can be eliminated.

  Similarly, in the electrical induction part where the separator and the power generation part are connected, by applying a structure that has a small contact area near the entrance and a large value near the exit, the reaction area becomes small near the entrance and the supply of electrons Decreases and the amount of oxygen consumed decreases.

  In addition, since the reacting area is large near the outlet, the supply of electrons increases, and oxygen that has not been consumed near the inlet is consumed near the outlet.

  As a result, the electrochemical reaction is suppressed in the vicinity of the inlet, and the electrochemical reaction is promoted in the vicinity of the outlet, so that the power generation difference between the vicinity of the inlet and the vicinity of the outlet can be eliminated.

  According to the present invention, it is possible to reduce the difference in power generation between the vicinity of the inlet and the vicinity of the outlet by changing the amount of oxygen consumed in the electrochemical reaction and the amount of water vapor generated and controlling the electrochemical reaction.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a conceptual diagram of a fuel cell separator 100 according to a first embodiment of the present invention.

  The separator 100 is based on a thin metal material such as stainless steel, titanium, or aluminum formed by press working, and separates the fuel gas and the oxidant gas so that the gas is evenly distributed to the diffusion layer. It has a devised flow path structure and dielectrics electricity generated by a membrane / electrode assembly (MEA) described later.

  The separator 100 includes an inlet 103 into which a gas is injected, a flow path portion 102 through which the gas flows, an electric induction portion 101, an outlet 104 through which the gas is discharged, and a sealing material 121 installed so that the gas does not leak outside. Become.

  Here, an aluminum metal material having a length of 120 mm, a width of 18 mm, and a thickness of 0.2 mm is used for the base of the separator 100.

  Here, the separator 100 of the present invention is characterized in that members having different electrical conductivities are installed in the electrical induction portion 101. For example, four regions 106, 197, 108, and 109 are provided from the inlet 103 into which the gas of the separator 100 is injected toward the outlet 104 through which the gas is discharged, and the electric conductivity of the electric induction portion 101 is different for each region. Apply the member.

  FIG. 2 shows the material and electric conductivity of the electric induction portion 101 for each of the four regions 106, 197, 108 and 109.

  In FIG. 2, a member made of carbon paper is applied to the region 106, a member made of graphite is applied to the region 107, a member made of titanium is applied to the region 108, and a member made of aluminum is applied to the region 109. Apply respectively.

  The electric induction part 101 prepares members having different electrical conductivities of 20 mm in length, 2 mm in width, and 0.5 mm in thickness for each of the four regions 106, 197, 108, and 109.

  However, the length of the members located at both ends of the regions 106 and 109 is 30 mm.

  In FIG. 1, a cross-sectional view 105 represents a cross section when the separator 100 is cut along a line ab. As can be seen from the cross-sectional view 105, the separator 100 is formed by pressing aluminum metal material to form a groove having a width of 2 mm and a height of 0.1 mm, and the formed thin plate 111 constitutes the electric induction portion 101. The members 112 having different electric conductivities are formed by being fitted.

  In this way, in the electric induction part 101 where the separator and the power generation part are connected, the electric conductivity is small near the inlet, increases near the outlet, the supply of electrons is suppressed near the inlet, and the amount of oxygen consumed is reduced. The oxygen that is reduced and not consumed near the inlet is consumed near the outlet. As a result, the electrochemical reaction is suppressed in the vicinity of the inlet, and the electrochemical reaction is promoted in the vicinity of the outlet, so that the power generation difference between the vicinity of the inlet and the vicinity of the outlet can be eliminated.

On the other hand, when the thickness of the electric induction portion 101 is L [m] and the cross-sectional area parallel to the MEA is A [m ² ], the electric resistance R [Ω] is calculated from the following equation. Here, ρ is the electrical resistivity [Ωm] of the electrical induction unit 101, and takes the reciprocal of the electrical conductivity [1 / Ωm].

R = ρ · L / A (3)
By changing the shape of the electric induction portion 101 from the entrance to the exit from the equation (3), the supply of electrons can be controlled and the amount of electrochemical reaction can be changed.

  For example, the shape of the electric induction part 101 is extended from the inlet to the outlet, the contact surface with the membrane-electrode assembly (MEA) is gradually increased or the thickness is reduced, and the electric conduction is improved from the inlet to the outlet, The gap in power generation near the entrance and exit can be eliminated.

The second embodiment will be described below.
FIG. 3 is a conceptual diagram of a fuel cell separator 300 showing a second embodiment of the present invention.

  The separator 300 is formed by pressing a thin metal material having a thickness of 0.2 mm, such as stainless steel, titanium, or aluminum, so that the fuel gas and the oxidant gas are separated so that the gas is evenly distributed to the diffusion layer. It has a devised flow path structure and dielectrics electricity generated by a membrane / electrode assembly (MEA) described later.

  The separator 300 includes an inlet 303 into which gas is injected, a flow path section 302 through which the gas flows, an electric induction section 301, an outlet 304 through which the gas is discharged, and a sealing material 306 that is installed so that the gas does not leak outside. Become.

Here, an aluminum metal material having a length of 120 mm, a width of 18 mm, and a thickness of 0.2 mm is used for the base of the separator 300, and the electric induction portion 301 formed by press working has a width near the inlet 303 of the separator 300. Is set to be 1 mm and 3 mm near the outlet 304, so that the contact surface with the membrane-electrode assembly (MEA) increases from the inlet toward the outlet.
By doing so, in the electric induction portion 301 to which the separator and the power generation portion are connected, the strength of the electrochemical reaction is small near the entrance and large near the exit due to the difference in electrical resistance.

  As a result, the electrochemical reaction is suppressed in the vicinity of the inlet, and the electrochemical reaction is promoted in the vicinity of the outlet, so that the difference in power generation between the vicinity of the inlet and the outlet can be eliminated.

  FIG. 4 is a diagram illustrating a fuel battery cell 400 produced using the separator of the present invention.

  The fuel cell 400 is configured such that a membrane-electrode assembly (MEA) 402 is sandwiched from both sides by an anode-side separator 401 and a cathode-side separator 403, and 1 megapascal using a clamping plate 407 and a bolt 408. It is created by tightening a torque wrench so that the tightening pressure is

  In FIG. 4, for the sake of convenience, tightening is shown as being performed at one location in the center of the fuel cell 400, but tightening is performed using a plurality of tightening plates 407 and bolts 408, and tightening pressure is reduced. Try to be even.

  Two separators of the same type are prepared and used as the anode side separator 401 and the cathode side separator 403. Here, the separator 100 described in FIG. 1 is used.

  The membrane / electrode assembly (MEA) 402 needs to have a size that covers the flow path and the dielectric region of the separator 100 so that the gas on the anode side does not leak to the cathode side.

  Here, the membrane / electrode assembly (MEA) 402 has a slightly larger area than the separator 100, a length of 10.5 mm, a width of 18.5 mm, and a sealing material of 0.25 mm. The anode side gas should not leak to the cathode side.

  FIG. 5 is a cross-sectional view of the fuel cell 400 cut at the center and shows an enlarged thickness direction.

  In the cross-sectional view of FIG. 5, the membrane-electrode assembly (MEA) 502 is sandwiched from both sides by the anode-side separator 501 and the cathode-side separator 503, and tightened using a clamping plate 510 and bolts 511, 512. The electrode assembly (MEA) 502 is slightly larger than the separator 100 so that gas on the anode side does not leak to the cathode side, and 0.25 mm is put between the sealing materials 508 and 509.

  Here, the separator 100 described in FIG. 1 is used for the anode-side separator 501 and the cathode-side separator 503. However, when the separator 300 described in FIG. 3 is used, the fuel cell 400 is constructed in the same manner. Can do.

  Next, the membrane / electrode assembly (MEA) 402 will be described.

  The MEA is configured such that a cathode side electrode and an anode side electrode are sandwiched between both sides of a solid polymer electrolyte membrane. As the solid polymer electrolyte membrane, an ion exchange membrane having proton conductivity, for example, a fluorine ion exchange membrane having a thickness of 0.03 mm using Nafion 117 (Nafion 117, 175 μm, manufactured by Du Pont) or the like is used.

  The cathode side electrode and the anode side electrode are respectively formed of a catalytic reaction layer and a diffusion layer. The cathode side diffusion layer and the anode side diffusion layer enhance the diffusibility of the fuel gas or the oxidant gas, and the reaction generated by power generation. It is necessary to have a function of discharging generated water and electronic conductivity. For example, a conductive porous material such as carbon paper or carbon cloth that has been subjected to water repellent treatment can be applied.

  Here, a carbon non-woven fabric having a thickness of 0.2 mm (TGP-H060 manufactured by Toray Industries, Inc.) is used as the conductive porous material, and it is immersed in an emulsion liquid of a fluorine-based water repellent (D1 manufactured by Daikin) for water repellent treatment After drying, heat treatment was performed at 350 ° C. for 10 minutes to form a diffusion layer.

  The catalytic reaction layer is a thin film having a thickness of about 0.01 mm mainly composed of conductive carbon particles supporting a catalytic metal and a polymer electrolyte.

  In the anode and cathode catalyst reaction layers, catalyst supporting particles in which 50% by weight of platinum is supported on Ketjen Black (manufactured by AKZO Chemie), which is conductive carbon particles having an average primary particle size of 30 nm, are dispersed in an isopropanol aqueous solution. A solution and a solution in which a polymer electrolyte, for example, Nafion 117 is dispersed in ethanol, are mixed so that the weight ratio of the catalyst-supporting particles and the polymer electrolyte is 1: 1, and then highly dispersed by a bead mill. A slurry was prepared and applied to the previously prepared cathode side diffusion layer and anode side diffusion layer using a spray quarter, and this was dried at room temperature in the atmosphere for 6 hours.

  Thus, the cathode side electrode and the anode side electrode were formed by forming the cathode side catalyst reaction layer and the anode side catalyst reaction layer on the respective diffusion layers.

  Finally, a cathode electrode and an anode electrode are prepared, respectively, and are integrated by hot pressing (125 ° C., 4 MPa, 10 minutes) with both sides of the polymer electrolyte membrane (manufactured by DuPont, Nafion 117, 175 μm) centered. To create an MEA.

  Next, the effect of the electric induction part is verified using simulation for the fuel cell 400 showing the embodiment of the present invention.

  Here, the case where the separator 100 for fuel cells which showed the 1st Embodiment regarding this invention in FIG. 1 is used for a separator is verified.

  FIG. 6 is a diagram illustrating a shape obtained by modeling the analysis target in the fuel battery cell 400. The front view 600 is a model obtained by extracting the power generation portion of the fuel battery cell 400, having a length of 100 mm and a width of 18 mm, and the electrically conductive portions 605 and the flow paths 606 are alternately configured with a width of 2 mm.

  As described with reference to FIG. 1, four regions are set in the length direction of the electric conductive portion 605, and materials having different electric conductivities are applied to each as shown in FIG. 2.

  Further, the surface on this side where the power generation portion can be seen in the front view 600 is an anode-side separator, and the surfaces indicated by 601 and 603 are a fuel gas inlet surface and an outlet surface, respectively.

  The other side not visible in front view 600 is the cathode separator, and the surfaces indicated by 604 and 602 are the inlet and outlet surfaces of air (oxidant gas), respectively.

  Note that the flow of fuel gas and air is alternating current. That is, the right side of the front view 600 corresponds to the fuel gas outlet surface 603 and the air inlet surface 604.

  FIG. 7 is a front view 600 of FIG. 6, which is a cross-sectional view taken along the line connecting the central ab.

  FIG. 7 illustrates the structure in the thickness direction, and FIG. 8 illustrates the thickness and material of each member. In the cross-sectional view of FIG. 7, the anode side separator uses a 0.2 mm aluminum material for the base 701 and a 0.5 mm aluminum material for the electric conduction portion 705, and forms a 0.5 mm flow path 703 through which fuel gas passes. ing.

  In addition, the cathode side separator is formed on an aluminum material base 702 having a thickness of 0.2 mm, and as described with reference to FIG. 1, carbon paper, graphite, titanium, and aluminum having a thickness of 0.5 mm for each 20 mm or 30 mm interval. An electrically conductive portion 706 is disposed to form a flow path 704 through which air passes.

  In this analysis, in order to clarify the effect of the cathode-side electric conduction portion 706, only the cathode-side electric conduction portion 706 is provided with a member having a different electric conductivity for each region. The material of aluminum simple substance was used.

  The membrane-electrode assembly (MEA) includes an anode-side catalyst layer 709 and a cathode-side catalyst layer 710 so as to sandwich a Nafion electrolyte membrane 711 having a thickness of 0.03 mm from both sides, and an anode-side diffusion layer so as to sandwich them. 707 and a cathode side diffusion layer 708.

  Here, the catalyst layers 709 and 710 are made of conductive carbon particle layers supporting 50% by weight of platinum, and the diffusion layers 707 and 708 are made of carbon paper having a thickness of 0.2 mm.

  Based on the shape and material data shown in FIGS. 6, 7, and 8, analysis by simulation was performed.

  A Fluent fuel cell simulator was used for the simulation. The shape and material data shown in FIGS. 6, 7, and 8 were input to a fuel cell simulator manufactured by Fluent, analysis conditions for simulation as shown in FIG. 9 were set, and analysis by simulation was performed.

  Next, an analysis result using simulation is shown for the fuel cell 400 using a separator having an electric induction portion using members having different electric conductivity.

  Here, in order to clarify the effect of the electric induction part using the members having different electric conductivities, the fuel cell using the member having the same electric conductivity as the electric induction part is also analyzed by simulation.

  That is, with respect to the contents described in FIG. 6, FIG. 7, FIG. 8, and FIG. 9, the case where aluminum alone is used for the cathode side electric conduction part of FIG. Compare.

  FIG. 10 shows the current density distribution obtained as a result of simulation under the analysis conditions of FIG. The current density distribution 1001 is for a fuel cell using the same aluminum member for the electrical induction portion of the separator, and the current density distribution 1002 is a fuel cell using a member having a different electrical conductivity for the electrical induction portion of the separator. 400.

  It can be seen that the current density distribution 1001 has a larger current density and a stronger electrochemical reaction than the current density distribution 1002 on the right side, that is, near the air inlet.

  A graph 1003 shows the fuel cell using the same aluminum member for the electric induction portion of the separator, with the horizontal axis representing the position in the length direction of the fuel cell and the vertical axis representing the current density. A graph 1004 is a graph showing the fuel cell 400 using a member having different electrical conductivity for the electric induction portion of the separator, with the horizontal axis representing the position in the length direction of the fuel cell and the vertical axis representing the current density. .

  There are two lines on each graph. The upper line shows the value of the current density in the cathode catalyst layer under the flow path, and the lower line shows the current in the cathode catalyst layer under the electric induction part. The density value is shown.

  Comparing the current density values of the graph 1003 and the graph 1004, the graph 1003 has a larger value near the air inlet than the graph 1004, and a smaller value near the air outlet. It can be seen that the inclination is large.

  In other words, in the electrical induction part where the separator and the power generation part are connected, if a material having a small electric conductivity near the inlet and a large value near the outlet is applied, the supply of electrons necessary for the reaction near the inlet is suppressed. The amount of oxygen consumed is reduced, the supply of electrons is promoted near the exit, and the oxygen not consumed near the entrance is consumed near the exit.

  As a result, the electrochemical reaction is suppressed in the vicinity of the inlet, and the electrochemical reaction is promoted in the vicinity of the outlet, so that it is understood that the difference in power generation between the inlet and the outlet can be eliminated.

  In FIG. 11, the regions of the current density distributions 1001 and 1002 are divided into 15 parts as shown by 1101, the representative values of the current density are calculated for each region, and the average value and the maximum value are calculated for these divided 15 regions. , The minimum value, and the standard deviation indicating the amount of deviation from the average value are obtained and summarized in a table 1102.

  From Table 1102, the current density of the fuel battery cell 400 using a member having a different electrical conductivity for the electrical induction part of the separator is compared with the current density of the fuel battery cell using the same aluminum member for the electrical induction part of the separator. Although the average value does not differ greatly, the range of current density values that can be taken from the maximum value and minimum value is as narrow as 0.34 compared to 0.34, and the standard deviation indicates the amount of deviation from the average value. It can be seen that 0.095 is 0.083, which is about 10% smaller, and the unevenness with respect to the value of the current density is reduced.

  Therefore, in the electrical induction part where the separator and the power generation part are connected, if a material having a small electric conductivity near the inlet and a large value near the outlet is applied, the electrochemical reaction is suppressed near the inlet, and near the outlet. Since the electrochemical reaction is promoted, power generation spots are eliminated in the entire power generation region, which can contribute to a longer life of the MEA.

  As mentioned above, the effect of the electric induction part was verified using simulation for the fuel cell 400 showing the embodiment of the present invention.

  Here, the case where the separator 100 for a fuel cell shown in FIG. 1 and showing the first embodiment related to the present invention was used as the separator was verified. Similarly, the second embodiment related to the present invention shown in FIG. Even in the case where the fuel cell separator 300 according to the embodiment is used, in the electric induction part where the separator and the power generation part are connected, the contact area is reduced in the vicinity of the inlet to reduce the electric conduction, and in the vicinity of the outlet. Since the electrical conductivity is large due to the increased contact area, the supply of electrons necessary for the reaction is suppressed near the entrance, the amount of oxygen consumed is reduced, and the supply of electrons is promoted near the exit. Oxygen that was not consumed nearby is consumed near the exit.

  As a result, the electrochemical reaction is suppressed near the inlet, and the electrochemical reaction is promoted near the outlet.Therefore, it is considered that the disparity in power generation between the inlet and the outlet can be eliminated. Power generation spots are eliminated, which can contribute to a longer life of MEA.

  According to the present invention, the life of the MEA can be extended, and the MEA can be used for a fuel cell as a stationary power source and a moving body power source.

The figure which showed the separator for fuel cells which showed 1st Embodiment regarding this invention. The table | surface which showed the material and the electrical conductivity for every area | region of the electric induction part. The figure which showed the separator for fuel cells which showed 2nd Embodiment regarding this invention. The figure which showed the fuel cell produced using the separator for fuel cells of embodiment of this invention. Sectional drawing when a fuel cell is cut at the center. The figure explaining the shape data which modeled the fuel cell for analysis. The figure explaining the shape data of the modeled fuel cell. The table | surface explaining the shape data and material of the modeled fuel cell. A table explaining the analysis conditions for simulation. The figure explaining current density distribution with the analysis result of simulation. A table explaining the current density distribution in the simulation analysis results.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Separator 101 Electric induction part 102 Flow path part 103 through which gas flows Inlet 104 into which gas is injected 104 Outlet 121 through which gas is discharged 121 Sealing material

Claims (1)

Sandwiching the electrolyte layer between the fuel electrode and the oxygen electrode,
A fuel electrode separator having an electric induction portion that forms a fuel gas flow path along the fuel electrode, and inducts electricity with respect to the fuel electrode;
In the fuel cell comprising: an oxygen electrode separator having an electric induction part that forms an oxidant gas flow path along the oxygen electrode and dielectrics electricity with respect to the oxygen electrode;
The electric induction part of the oxygen electrode separator is composed of a plurality of conductive members having different electric conductivities,
From the inlet of the oxidizing gas channel, towards the outlet of the oxidizing gas channel, said plurality of conductive members so as to electric conductivity of the electric induction portion of the oxygen electrode separator increases is located A fuel cell.

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