JP5694123B2 - Fuel cell - Google Patents

Description

  The present invention relates to a fuel cell in which an electrolyte / electrode structure in which electrodes are provided on both sides of an electrolyte and a separator are laminated.

  For example, a solid polymer fuel cell employs a solid polymer electrolyte membrane made of a polymer ion exchange membrane. This fuel cell has an electrolyte membrane / electrode structure (MEA) in which an anode electrode and a cathode electrode each made of an electrode catalyst (electrode catalyst layer) and porous carbon (gas diffusion layer) are disposed on both sides of a solid polymer electrolyte membrane. ) Is constituted by a separator (bipolar plate). Normally, in a fuel cell, a fuel cell stack in which a predetermined number of power generation cells are stacked is used as, for example, an in-vehicle fuel cell stack.

  In this type of fuel cell, fuel gas may pass through the solid polymer electrolyte membrane from the anode side to the cathode side, while oxidant gas may pass through the solid polymer electrolyte membrane from the cathode side to the anode side. .

For this reason, hydrogen and oxygen react with each other on the anode side and the cathode side to easily generate hydrogen peroxide (H ₂ O ₂ ) (H ₂ + O ₂ → H ₂ O ₂ ). This hydrogen peroxide is decomposed on the carbon support or platinum (Pt) in the electrode, and for example, a hydroxy radical (.OH) is generated. Thereby, there exists a problem of deteriorating a solid polymer electrolyte membrane and an electrode catalyst.

  Thus, for example, a fuel cell electrode potential measuring device disclosed in Patent Document 1 is known. In this prior art, as shown in FIG. 15, an electrode potential measuring device 3 is incorporated in a fuel cell stack in which a unit cell 1 is sandwiched between a pair of separators 2. The unit cell 1 is configured by sandwiching a solid polymer electrolyte 1a between an oxygen electrode 1b and a fuel electrode 1c.

  The electrode potential measuring device 3 includes a detection unit 4, a voltmeter 5, and conducting wires 6a and 6b. The detection unit 4 includes a detection piece 4a provided in the oxygen electrode 1b, a detection terminal 4b connected to the surface of the detection piece 4a, and a protection member 4c that protects the detection terminal 4b. The detection piece 4a is cut out from a part of the oxygen electrode 1b and is provided in an insulated state from the oxygen electrode 1b via an insulating part 4d.

  The detection piece 4a is in contact with the solid polymer electrolyte 1a, and is configured to be capable of ionic conduction with the solid polymer electrolyte 1a. Thus, it is possible to detect an abnormal potential at a location where air (oxygen) is unevenly distributed on the fuel electrode 1c side.

Japanese Patent No. 4269599

  In Patent Document 1, the detection terminal 4b is circulated around the insulating portion 4d and provided on the gas diffusion layer 1bg of the oxygen electrode 1b. For this reason, in the gas diffusion layer 1bg, the gas diffusibility in the region where the insulating portion 4d is disposed may be reduced. Therefore, there is a problem that good measurement accuracy cannot be obtained when various kinds of measurements are performed by supplying a desired gas to the gas flow paths of the respective separators 2.

  An object of the present invention is to solve this type of problem, and to provide a fuel cell capable of measuring various characteristics of an electrolyte / electrode structure with high accuracy with a simple configuration. To do.

The present invention relates to a fuel cell in which an electrolyte / electrode structure in which electrodes are provided on both sides of an electrolyte and a separator are laminated. The fuel cell includes a pair of measurement terminal members that are inserted from the side surface direction of the electrolyte / electrode structure and are disposed on both surfaces of the electrolyte / electrode structure, and at least one of the measurement terminal members includes the electrolyte A gas passage portion is provided in a part of the measurement electrode layer that contacts the electrode surface of the electrode structure.

  Further, in this fuel cell, the measurement electrode layer has a measurement electrode portion and an insulating portion, and the gas passage portion has a plurality of slit-shaped notches formed in the measurement electrode portion and the insulating portion. It is preferable that the region is constituted.

  Further, in this fuel cell, the measurement electrode layer has a measurement electrode portion and a porous insulating portion, and the gas passage portion includes a plurality of holes formed in the measurement electrode portion and the porous insulating portion. It is preferable that it is comprised by a part.

  Furthermore, in this fuel cell, the electrode has an electrode catalyst layer and a gas diffusion layer, the electrode catalyst layer is divided into a plurality of segments, and the measurement electrode layer of the measurement terminal member is divided. It is preferable that the electrode catalyst layer is interposed between the gas diffusion layer.

  According to the present invention, the measurement terminal members are arranged on both surfaces of the electrolyte / electrode structure, and at least one of the measurement terminal members is in contact with the electrode surface of the electrolyte / electrode structure. A gas passage region is provided in a part of the gas passage. For this reason, the gas diffusibility at the installation site of the measurement terminal member is effectively improved, and various characteristics of the electrolyte / electrode structure can be measured with good and high accuracy with a simple configuration.

It is a principal part disassembled perspective explanatory drawing of the fuel cell which concerns on the 1st Embodiment of this invention. It is front explanatory drawing of the electrolyte membrane and electrode structure which comprises the said fuel cell. It is the III-III sectional view taken on the line of the said fuel cell in FIG. It is a perspective explanatory view of the measurement terminal member which constitutes the fuel cell. It is explanatory drawing of the calculation process of film | membrane resistance. It is explanatory drawing of the equivalent circuit of the calculation process of the said film resistance. It is explanatory drawing of the calculation process of a hydrogen permeation amount, and the calculation process of an effective platinum surface area. It is explanatory drawing of the equivalent circuit of the calculation process of the said hydrogen permeation | transmission amount. It is explanatory drawing of the equivalent circuit of the calculation process of the said effective platinum surface area. It is explanatory drawing of the calculation process of hydrogen peroxide. It is explanatory drawing of the equivalent circuit of the calculation process of the said hydrogen peroxide. It is a principal part perspective explanatory view of the terminal member for measurement which constitutes the fuel cell concerning a 2nd embodiment of the present invention. It is a principal part perspective view of the measurement terminal member which comprises the fuel cell which concerns on the 3rd Embodiment of this invention. It is principal part perspective explanatory drawing of the terminal member for measurement which comprises the fuel cell which concerns on the 4th Embodiment of this invention. FIG. 4 is a cross-sectional explanatory diagram of a fuel cell stack including the electrode potential measuring device of Patent Document 1.

  As shown in FIG. 1, a plurality of fuel cells 10 according to the first embodiment of the present invention are stacked to form an in-vehicle fuel cell stack mounted on a fuel cell vehicle such as a fuel cell electric vehicle. Configure.

  In the fuel cell 10, an electrolyte membrane / electrode structure (electrolyte / electrode structure) 12 is sandwiched between a first separator 14 and a second separator 16. The first separator 14 and the second separator 16 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, a metal plate whose surface is subjected to anticorrosion treatment, a carbon member, or the like. .

  An oxidation for supplying an oxidant gas, for example, an oxygen-containing gas, to the upper edge of the fuel cell 10 in the direction of arrow C (vertical direction in FIG. 1) communicates with the direction of arrow A, which is the stacking direction. The agent gas inlet communication hole 18a and the fuel gas inlet communication hole 20a for supplying a fuel gas, for example, a hydrogen-containing gas, are arranged in the arrow B direction (horizontal direction).

  The lower end edge of the fuel cell 10 in the direction of arrow C communicates with each other in the direction of arrow A, a fuel gas outlet communication hole 20b for discharging fuel gas, and an oxidant gas outlet for discharging oxidant gas The communication holes 18b are arranged in the arrow B direction.

  A pair of cooling medium inlet communication holes 22a for supplying a cooling medium is provided at one end edge of the fuel cell 10 in the arrow B direction, and at the other end edge of the fuel cell 10 in the arrow B direction, A pair of cooling medium outlet communication holes 22b is provided for discharging the cooling medium.

  An oxidant gas flow path 26 communicating with the oxidant gas inlet communication hole 18a and the oxidant gas outlet communication hole 18b is provided on the surface 14a of the first separator 14 facing the electrolyte membrane / electrode structure 12. A fuel gas passage 28 communicating with the fuel gas inlet communication hole 20a and the fuel gas outlet communication hole 20b is formed on the surface 16a of the second separator 16 facing the electrolyte membrane / electrode structure 12. The oxidant gas channel 26 and the fuel gas channel 28 circulate the oxidant gas and the fuel gas in the vertical direction.

  The cooling medium inlet communication hole 22a and the cooling medium outlet communication hole 22b communicate with the surface 14b opposite to the surface 14a of the first separator 14 and the surface 16b opposite to the surface 16a of the second separator 16. A cooling medium flow path 30 is formed. The cooling medium channel 30 circulates the cooling medium in the horizontal direction.

  The first seal member 32 is integrated with the surfaces 14a and 14b of the first separator 14 around the outer peripheral end of the first separator 14, and the surfaces 16a and 16b of the second separator 16 are integrated with each other. The second seal member 34 is integrated around the outer peripheral end of the second separator 16.

  The first seal member 32 and the second seal member 34 are, for example, EPDM, NBR, fluororubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material, Alternatively, a packing material is used.

  As shown in FIGS. 1 and 2, the electrolyte membrane / electrode structure 12 includes, for example, a solid polymer electrolyte membrane 36 in which a perfluorosulfonic acid thin film is impregnated with water, and the solid polymer electrolyte membrane 36 sandwiched therebetween. An anode electrode 38 and a cathode electrode 40 are provided. The solid polymer electrolyte membrane 36 uses a HC (hydrocarbon) electrolyte in addition to a fluorine electrolyte, and has a larger surface area than the anode electrode 38 and the cathode electrode 40.

  As shown in FIG. 3, the anode electrode 38 and the cathode electrode 40 include electrode catalyst layers 38a and 40a bonded to both surfaces of the solid polymer electrolyte membrane 36, and carbon paper disposed on the electrode catalyst layers 38a and 40a. Gas diffusion layers 38b and 40b made of the like. The electrode catalyst layers 38 a and 40 a have a symmetrical planar shape with the solid polymer electrolyte membrane 36 interposed therebetween. The electrode catalyst layers 38 a and 40 a are formed by uniformly applying porous carbon particles having a platinum alloy supported on the surface and an ion exchange component on both surfaces of the solid polymer electrolyte membrane 36. The electrode catalyst layers 38a and 40a are each divided into a plurality of segments (see FIGS. 1 and 2).

  A plurality of measurement terminal members 42 and 44 are arranged on both surfaces of the electrolyte membrane / electrode structure 12 so as to overlap each other in the stacking direction (arrow A direction). The measurement terminal member 42 is interposed between the electrode catalyst layer 38a and the gas diffusion layer 38b constituting the anode electrode 38 in the electrode surface on the anode electrode 38 side. As shown in FIG. 1, the measurement terminal member 42 corresponds to each of the three electrode catalyst layers 38 a arranged on the outer side in the arrow B direction, for example, among the divided electrode catalyst layers 38 a. Provided.

  As shown in FIG. 3, the measurement terminal member 44 is interposed between the electrode catalyst layer 40a and the gas diffusion layer 40b constituting the cathode electrode 40 in the electrode surface on the cathode electrode 40 side. As shown in FIG. 2, the measurement terminal member 44 corresponds to each of the three electrode catalyst layers 40a, for example, each of the three electrode catalyst layers 40a arranged outward in the direction of the arrow B among the divided electrode catalyst layers 40a. Provided.

  As shown in FIGS. 3 and 4, the measurement terminal member 42 includes a measurement electrode portion 46 that contacts the electrode catalyst layer 38 a of the anode electrode 38. The measurement electrode portion 46 has a rectangular shape, and is formed of, for example, gold (Au) and connected to the two conductive lines 48a and 48b. An insulating portion 50 is provided so as to cover the measurement electrode portion 46 and the conductive lines 48a and 48b. The insulating unit 50 is formed of, for example, a PEM film, polystyrene, a corrosion-resistant liquid crystal polymer, or the like.

  In the measurement electrode part 46 and the insulating part 50, gas passage parts, for example, a plurality of slit-like notch parts 52a and 52b, respectively, in the range overlapping the electrode catalyst layer 38a with respect to the stacking direction are the same in the stacking direction. Formed in position. That is, the measurement electrode layer constituted by the measurement electrode unit 46 and the insulating unit 50 has a gas passage site penetrating in the stacking direction (arrow A direction) via a plurality of slit-like cutout sites 52a and 52b. Is formed. The slit-shaped notches 52a and 52b are long in the direction of arrow B intersecting the fuel gas flow direction (arrow C1 direction) in the fuel gas flow path 28.

  The measurement terminal member 44 includes a measurement electrode portion 54 that contacts the electrode catalyst layer 40 a of the cathode electrode 40. The measurement electrode unit 54 has a rectangular shape, and is formed of, for example, gold (Au) and is connected to the two conductive lines 56a and 56b. An insulating portion 58 is provided so as to cover the measurement electrode portion 54 and the conductive lines 56a and 56b. The insulating part 58 is formed of, for example, a PEM film, polystyrene, a corrosion-resistant liquid crystal polymer, or the like.

  In the measurement electrode portion 54 and the insulating portion 58, gas passage portions, for example, a plurality of slit-shaped notch portions 60a and 60b, respectively, in the range overlapping the electrode catalyst layer 40a with respect to the stacking direction are the same in the stacking direction. Formed in position. That is, in the measurement electrode layer constituted by the measurement electrode portion 54 and the insulating portion 58, the gas passage portion penetrating in the stacking direction (arrow A direction) through the plurality of slit-like cutout portions 60a and 60b, respectively. Is formed. The slit-shaped notches 60a and 60b are long in the direction of arrow B intersecting with the flow direction of the oxidant gas in the oxidant gas flow path 26 (the direction of arrow C1).

  In the first embodiment, although the gas passage portions are formed in both of the measurement terminal members 42 and 44, the present invention is not limited to this. For example, the gas passage portion may be provided only on the measurement terminal member 44 or only on the measurement terminal member 44. The same applies to the second and subsequent embodiments described below.

  The operation of the fuel cell 10 configured as described above will be described below.

  As shown in FIG. 1, an oxidant gas (for example, air) such as an oxygen-containing gas is supplied to the oxidant gas inlet communication hole 18a, and a hydrogen-containing gas or the like is supplied to the fuel gas inlet communication hole 20a. Fuel gas (for example, hydrogen gas) is supplied. A cooling medium such as pure water or ethylene glycol is supplied to the cooling medium inlet communication hole 22a.

  The oxidant gas is introduced from the oxidant gas inlet communication hole 18 a into the oxidant gas flow path 26 of the first separator 14, moves in the direction of arrow C, and is supplied to the cathode electrode 40 of the electrolyte membrane / electrode structure 12. . On the other hand, the fuel gas is introduced into the fuel gas flow path 28 of the second separator 16 from the fuel gas inlet communication hole 20a. The fuel gas moves in the direction of arrow C along the fuel gas flow path 28 and is supplied to the anode electrode 38 of the electrolyte membrane / electrode structure 12.

  Therefore, in each electrolyte membrane / electrode structure 12, the oxidant gas supplied to the cathode electrode 40 and the fuel gas supplied to the anode electrode 38 are consumed by an electrochemical reaction in the electrode catalyst layers 40a and 38a. Power generation.

  Next, the oxidant gas that has been supplied to the cathode electrode 40 and at least partially consumed is discharged in the direction of arrow A along the oxidant gas outlet communication hole 18b. Similarly, the fuel gas that is supplied to the anode electrode 38 and is at least partially consumed is discharged in the direction of arrow A along the fuel gas outlet communication hole 20b.

  The cooling medium supplied to the cooling medium inlet communication hole 22 a is introduced into the cooling medium flow path 30 between the first separator 14 and the second separator 16 and then flows in the direction of arrow B. This cooling medium is discharged from the cooling medium outlet communication hole 22b after the electrolyte membrane / electrode structure 12 is cooled.

  Next, a method for detecting the membrane resistance (resistance value in the film thickness direction) of the electrolyte membrane / electrode structure 12 will be described below.

  First, as shown in FIG. 5, humidified hydrogen gas (fuel gas) is supplied to the anode electrode 38, and humidified air (oxidant gas) is supplied to the cathode electrode 40. Power generation is taking place.

  On the other hand, as shown in the equivalent circuit of FIG. 6, the measurement terminal members 42 and 44 perform impedance measurement by the AC four-terminal method. In the measurement terminal member 42, one conductive line 48a is used for voltage measurement, and the other conductive line 48b is used as an alternating current source. In the measurement terminal member 44, one conductive line 56a is used for voltage measurement, and the other conductive line 56b is used as an alternating current source. Then, the membrane resistance value (R) of the solid polymer electrolyte membrane 36 is calculated to obtain the membrane resistance value over the entire power generation surface of the electrolyte membrane / electrode structure 12, and the moisture content distribution over the entire power generation surface from the membrane resistance value. Is measured.

  In this case, in the first embodiment, as shown in FIG. 4, a plurality of slit-shaped notch portions 52 a and 52 b are provided on the measurement electrode layer constituted by the measurement electrode portion 46 and the insulating portion 50, respectively. A gas passage portion penetrating in the stacking direction (arrow A direction) is formed. Similarly, the measurement electrode layer composed of the measurement electrode portion 54 and the insulating portion 58 passes through the gas passing through in the stacking direction (arrow A direction) via a plurality of slit-shaped cutout portions 60a and 60b, respectively. A site is formed.

  For this reason, in the electrolyte membrane / electrode structure 12, hydrogen gas can be satisfactorily supplied to the region where the measurement electrode portion 46 is disposed via the slit-shaped cutout portions 52a and 52b, It is possible to supply air also into the region where the measurement electrode unit 54 is disposed through the slit-shaped cutout portions 60a and 60b. Therefore, the gas diffusibility at the installation site of the measurement terminal members 42 and 44 is effectively improved, and the membrane resistance value on the entire power generation surface of the electrolyte membrane / electrode structure 12 can be measured with good and high accuracy with a simple configuration. The effect that it becomes possible is acquired.

  Moreover, unlike a metal wire or the like, the area to be measured can be defined, so that electrical information per unit area can be obtained accurately. In addition, since the sensor structure extends in the MEA surface direction of the electrolyte membrane / electrode structure 12, measurement can be performed in a state where the electrolyte membrane / electrode structure 12 is laminated. Twelve analyzes can be performed satisfactorily.

  In the first embodiment, a current-potential curve can be obtained using electrochemical measurement by cyclic voltammetry (CV).

  Further, as shown in FIG. 7, humidified hydrogen gas (fuel gas) is supplied to the anode electrode 38, and humidified nitrogen gas is supplied to the cathode electrode 40. The amount of hydrogen permeation to the side and the effective platinum surface area are calculated. Specifically, FIG. 8 shows an equivalent circuit when calculating the hydrogen permeation amount, while FIG. 9 shows an equivalent circuit when calculating the effective platinum surface area. At that time, the hydrogen permeation amount and the effective platinum surface area are calculated from the measured current value.

  Furthermore, FIG. 10 shows a gas supply method when calculating hydrogen peroxide, and FIG. 11 shows an equivalent circuit when calculating hydrogen peroxide. When calculating the hydrogen peroxide, as shown in FIG. 10, humidified hydrogen gas (fuel gas) is supplied to the anode electrode 38, while the cathode electrode 40 is first humidified. Nitrogen gas is supplied. Next, humidified air (oxidant gas) is supplied to the cathode electrode 40. For this reason, as shown in FIG. 11, the hydrogen peroxide amount is calculated from the measured current value.

  Thereby, in the first embodiment, the gas diffusibility at the installation site of the measurement terminal members 42 and 44 is effectively improved, and various characteristics of the electrolyte membrane / electrode structure 12 are excellent and high with a simple configuration. It becomes possible to measure with high accuracy.

  FIG. 12 is a perspective explanatory view of main parts of the measurement terminal members 72 and 74 constituting the fuel cell 70 according to the second embodiment of the present invention. The same components as those of the fuel cell 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third and subsequent embodiments described below, detailed description thereof is omitted.

  The measurement terminal member 72 includes a measurement electrode portion 76 that is in contact with the electrode catalyst layer 38a of the anode electrode 38. The measurement electrode portion 76 and the insulating portion 50 each have a plurality of slit-shaped cutout portions 78a. 78b are formed at the same position in the stacking direction. The leading ends of the slit-shaped notches 78a and 78b are opened to the outside.

  The measurement terminal member 74 includes a measurement electrode portion 80 that contacts the electrode catalyst layer 40a of the cathode electrode 40, and the measurement electrode portion 80 and the insulating portion 58 each include a plurality of slit-shaped cutout portions 82a. , 82b are formed at the same position in the stacking direction. The leading end sides of the slit-shaped cutout portions 82a and 82b are opened to the outside.

  For this reason, in 2nd Embodiment, the front-end | tip of the gas passage part of the measurement terminal members 72 and 74 is open | released outside, and it becomes easy to discharge | emit especially a water droplet. Therefore, the effect that it becomes possible to suppress the generation | occurrence | production of the short circuit by stagnant water as much as possible is acquired.

  FIG. 13 is an explanatory perspective view of main parts of the measurement terminal members 92 and 94 constituting the fuel cell 90 according to the third embodiment of the present invention.

  The measurement terminal member 92 includes a measurement electrode portion 96 that contacts the electrode catalyst layer 38a of the anode electrode 38. The measurement electrode portion 96 and the insulating portion 50 each include a plurality of slit-shaped cutout portions 98a. 98b are formed at the same position in the stacking direction. The slit-shaped notches 98a and 98b extend in the direction of arrow C parallel to the fuel gas flow direction.

  The measurement terminal member 94 includes a measurement electrode portion 100 that contacts the electrode catalyst layer 40a of the cathode electrode 40, and the measurement electrode portion 100 and the insulating portion 58 each have a plurality of slit-shaped cutout portions 102a. , 102b are formed at the same position in the stacking direction. The slit-shaped notches 102a and 102b extend in the direction of arrow C parallel to the oxidant gas flow direction.

  In the third embodiment configured as described above, the gas diffusibility at the installation site of the measurement terminal members 92 and 94 is effectively improved, and various characteristics of the electrolyte membrane / electrode structure 12 can be obtained with a simple configuration. The same effects as those of the first embodiment can be obtained, for example, it is possible to perform measurement with good accuracy.

  FIG. 14 is an explanatory perspective view of the main part of the measurement terminal members 112 and 114 constituting the fuel cell 110 according to the fourth embodiment of the present invention.

  The measurement terminal member 112 includes a measurement electrode portion 116 that contacts the electrode catalyst layer 38 a of the anode electrode 38, and a plurality of holes 118 are formed in the measurement electrode portion 116. The insulating part 50 is provided with a porous insulating part 120 corresponding to the measurement electrode part 116, and the porous insulating part 120 and the plurality of holes 118 constitute a gas passage part.

  The measurement terminal member 114 includes a measurement electrode portion 122 that contacts the electrode catalyst layer 38 a of the anode electrode 38, and a plurality of hole portions 124 are formed in the measurement electrode portion 122. The insulating part 58 is provided with a porous insulating part 126 corresponding to the measurement electrode part 122, and the porous insulating part 126 and the plurality of hole parts 124 constitute a gas passage part.

  In the fourth embodiment configured as described above, the energization distance can be shortened as much as possible and the hole area can be maximized. Moreover, effects such as good gas permeability can be obtained.

DESCRIPTION OF SYMBOLS 10, 70, 90, 110 ... Fuel cell 12 ... Electrolyte membrane electrode assembly 14, 16 ... Separator 18a ... Oxidant gas inlet communication hole 18b ... Oxidant gas outlet communication hole 20a ... Fuel gas inlet communication hole 20b ... Fuel gas Outlet communication hole 22a ... Cooling medium inlet communication hole 22b ... Cooling medium outlet communication hole 26 ... Oxidant gas flow path 28 ... Fuel gas flow path 30 ... Cooling medium flow path 36 ... Solid polymer electrolyte membrane 38 ... Anode electrodes 38a, 40a ... Electrode catalyst layer 38b, 40b ... Gas diffusion layer 40 ... Cathode electrode 42, 44, 72, 74, 92, 94, 112, 114 ... Measurement terminal members 46, 54, 76, 80, 96, 100, 116, 122 ... Measurement electrode parts 48a, 48b, 56a, 56b ... Conductive lines 50, 58 ... Insulating parts 52a, 52b, 60a, 60b, 78a, 78b, 82a, 8 b, 98a, 98b, 102a, 102b ... slit-shaped cutout portions 118, 124 ... holes 120, 126 ... porous insulating portion

Claims (4)

A fuel cell in which an electrolyte / electrode structure in which electrodes are provided on both sides of an electrolyte and a separator are laminated,
A pair of measurement terminal members that are inserted from the side surface direction of the electrolyte / electrode structure and disposed on both surfaces of the electrolyte / electrode structure,
The fuel cell according to claim 1, wherein at least one of the measurement terminal members is provided with a gas passage portion in a part of the measurement electrode layer in contact with the electrode surface of the electrolyte / electrode structure. The fuel cell according to claim 1, wherein the measurement electrode layer has a measurement electrode portion and an insulating portion,
2. The fuel cell according to claim 1, wherein the gas passage part is constituted by a plurality of slit-shaped notch parts formed in the measurement electrode part and the insulating part. The fuel cell according to claim 1, wherein the measurement electrode layer includes a measurement electrode portion and a porous insulating portion,
The fuel cell according to claim 1, wherein the gas passage portion includes a plurality of holes formed in the measurement electrode unit and the porous insulating unit. The fuel cell according to any one of claims 1 to 3, wherein the electrode includes an electrode catalyst layer and a gas diffusion layer, and the electrode catalyst layer is divided into a plurality of segments.
The fuel cell, wherein the measurement electrode layer of the measurement terminal member is interposed between the divided electrode catalyst layer and the gas diffusion layer.

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