JP2009277613A - Evaluation method of fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly evaluate the adhesion between a membrane electrode assembly and a diffusion layer. <P>SOLUTION: The evaluation method of a fuel cell comprises a process of preparing a membrane electrode assembly with a diffusion layer arranged at least on its one face; a process of dipping the membrane electrode assembly in solution; a process of measuring a resistance value of the membrane electrode assembly, by changing the moisture content of the membrane electrode assembly dipped in the solution; and a process of evaluating the adhesion quality between the membrane electrode assembly and the diffusion layer, with the use of the resistance value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for evaluating a fuel cell.

  Conventionally, in a fuel cell in which a membrane electrode assembly (MEA) and a diffusion layer for circulating a reaction gas are laminated, the adhesion between the membrane electrode assembly and the diffusion layer is evaluated. Various techniques for doing this are known.

JP 2005-71882 A JP 2002-313380 A JP 2006-196275 A JP 2001-345110 A

  However, in the method in which the inspection is performed based on the AC impedance in the fuel cell during power generation, it is necessary to disassemble the fuel cell when there is a defect. In addition, the inspection method based on the alternating current impedance may be affected by various factors in addition to the influence of the adhesion between the membrane electrode assembly and the diffusion layer, and it is difficult to evaluate the adhesion well.

  The present invention has been made to solve at least a part of the above-described conventional problems, and an object thereof is to satisfactorily evaluate the adhesion between the membrane electrode assembly and the diffusion layer.

  In order to solve at least a part of the above problems, the present invention employs the following aspects.

  A first aspect of the present invention provides a method for evaluating a fuel cell. The fuel cell evaluation method according to the first aspect of the present invention includes a step of preparing a membrane electrode assembly in which a diffusion layer is disposed on at least one surface, a step of immersing the membrane electrode assembly in a liquid, and a liquid The step of measuring the resistance value of the membrane electrode assembly by changing the water content of the membrane electrode assembly immersed in the film, and evaluating the quality of adhesion between the membrane electrode assembly and the diffusion layer using the resistance value And a step of performing.

  According to the evaluation method of the fuel cell according to the first aspect of the present invention, the adhesion between the membrane electrode assembly and the diffusion layer is improved by the resistance value of the membrane electrode assembly measured by changing the water content. Can be evaluated.

  In the fuel cell evaluation method according to the first aspect of the present invention, the water content of the membrane electrode assembly may be changed by flowing a dry gas over the surface of the diffusion layer. In this case, the water content of the membrane electrode assembly can be favorably changed by flowing a dry gas over the surface of the diffusion layer.

  In the fuel cell evaluation method according to the first aspect of the present invention, the quality of the adhesion may be evaluated using the resistance value measured after flowing the dry gas for a predetermined time. In this case, the adhesion between the membrane electrode assembly and the diffusion layer can be satisfactorily evaluated by the resistance value after flowing the dry gas for a predetermined time.

  In the fuel cell evaluation method according to the first aspect of the present invention, the quality of the adhesion may be evaluated using a change amount of the resistance value when the dry gas is allowed to flow for a predetermined time. In this case, the adhesion between the membrane electrode assembly and the diffusion layer can be satisfactorily evaluated by the amount of change in the resistance value.

  In the fuel cell evaluation method according to the first aspect of the present invention, the resistance value may be a resistance value generated by applying an alternating voltage in the stacking direction of the membrane electrode assembly. In this case, the adhesion between the membrane electrode assembly and the diffusion layer can be satisfactorily evaluated based on the resistance value generated by applying an alternating voltage in the stacking direction.

  In the fuel cell evaluation method according to the first aspect of the present invention, the quality of the adhesion may be evaluated by comparison with a resistance value of a reference membrane electrode assembly. In this case, the adhesion between the membrane electrode assembly and the diffusion layer can be satisfactorily evaluated by comparing the resistance values of the membrane electrode assembly to be evaluated and the reference membrane electrode assembly.

  The method for evaluating a fuel cell according to the first aspect of the present invention further includes a step of preparing an evaluation apparatus including a porous conductor and a conductor with a gas flow path, and the membrane electrode assembly on the porous conductor. And arranging the gas flow passage-equipped conductor on the diffusion layer to sandwich the membrane electrode assembly, and by flowing a liquid into the porous conductor, the membrane electrode junction A body is immersed in a liquid, a dry gas is allowed to flow on the surface of the diffusion layer through the flow path of the gas flow path conductor, and an AC voltage is applied between the porous conductor and the gas flow path conductor. By doing so, the resistance value of the membrane electrode assembly may be measured. In this case, the adhesion between the membrane / electrode assembly and the diffusion layer can be satisfactorily evaluated by using an evaluation apparatus including a porous conductor and a gas flow path-equipped conductor.

  The present invention can be realized in various forms, for example, an evaluation method, an evaluation apparatus, a combination of the evaluation method and the evaluation apparatus, and the like. It can be applied in combination or with some omitted.

  Hereinafter, a fuel cell evaluation method according to the present invention will be described based on examples with reference to the drawings.

A. First Example A1. Configuration of Evaluation Device FIG. 1 is an explanatory diagram illustrating a schematic configuration of an evaluation device according to a first example. An evaluation apparatus 10 for carrying out a fuel cell evaluation method according to the present invention includes a pressing device 500, a mass flow controller 600, a water pump 700, and a resistance measuring device 800. The pressing device 500 is a device that presses a membrane electrode assembly with a diffusion layer (illustrated later, hereinafter referred to as MEA with a diffusion layer) 100 to be evaluated with a predetermined pressure, and includes an upper conductor 410 and a lower conductor. A body 420, a squeezing 510, and a load cell 520 are provided.

  In the pressing device 500, the MEA 100 with a diffusion layer is disposed on the lower conductor 420, and the upper conductor 410 is brought into contact with the MEA 100 with the diffusion layer from above the MEA 100 with the diffusion layer to sandwich the MEA 100 with the diffusion layer. In this state, by operating the squeeze 510, the upper conductor 410 and the lower conductor 420 are brought close to each other to apply pressure to the MEA 100 with the diffusion layer. The surface pressure applied to the MEA 100 with the diffusion layer is detected by the load cell 520 disposed below the lower conductor 420.

  The upper conductor 410 is formed of a conductive member, and a conductor 300 with a gas flow path is disposed on a surface that contacts the MEA 100 with a diffusion layer. The conductor 300 with a gas flow path includes a groove on a surface side that contacts the MEA 100 with a diffusion layer, and the gas flow path 310 is formed by the contact between the groove and the MEA 100 with the diffusion layer. Note that the upper conductor 410 and the gas passage-equipped conductor 300 can be formed of a metal such as stainless steel, titanium, or aluminum, or a material other than metal may be used. Moreover, the expanded metal may be used for the conductor 300 with a gas flow path.

  Similarly to the upper conductor 410, the lower conductor 420 is formed of a conductive member, and the porous conductor 200 is disposed on the surface that contacts the MEA 100 with the diffusion layer. The porous conductor 200 is composed of a conductive porous body such as a foam sintered metal body. It can use without being specifically limited by the porosity and pore diameter of the porous conductor 200. The foamed sintered metal body may be made of stainless steel, nickel, copper, or the like in addition to titanium. The porous conductor 200 may use expanded metal.

  The mass flow controller 600 is a gas feed pump capable of controlling the gas flow rate. The mass flow controller itself is known and a commercially available one can be used. The mass flow controller 600 is connected to the gas flow path 310 by the blower pipe 610 and causes the gas to flow through the gas flow path 310. In the present embodiment, nitrogen gas is used as the gas to be circulated, but the present invention is not limited thereto, and other types of gases may be used.

  The water pump 700 is a pump that pumps liquid from a liquid supply means such as a container in which the liquid is stored. The water pump itself is publicly known, and a commercially available one can be used. The water supply pump 700 is connected to the porous conductor 200 by a water supply pipe 710 and sends a liquid to the porous conductor 200. In this embodiment, high-purity water such as pure water is used as the liquid, but any liquid containing at least water may be used.

  The resistance measuring instrument 800 is a device that includes two electrodes and applies an alternating voltage between the electrodes to detect a resistance value between the electrodes. The resistance measuring device itself is known and a commercially available one can be used. The two electrodes are connected to the upper conductor 410 and the lower conductor 420, respectively, and the resistance value of the MEA 100 with the diffusion layer is measured.

  The configuration of the MEA 100 with diffusion layer to be evaluated will be exemplified. MEA 100 with a diffusion layer has a configuration in which diffusion layers 130 are arranged on both sides of MEA (Membrane-Electrode Assembly) 115 in which catalyst layers 120 serving as an anode and a cathode are arranged on both surfaces of electrolyte membrane 110, respectively. Prepare. Further, a frame-like seal member 150 made of silicone rubber formed by injection molding is formed integrally with the MEA 100 with diffusion layer on the outer periphery of the MEA 100 with diffusion layer. The electrolyte membrane 110 is made of a polymer electrolyte membrane made of a fluorine resin. The catalyst layer 120 is formed of a carbon carrier carrying platinum and a platinum alloy as a catalyst. The diffusion layer 130 is formed of carbon paper that has been subjected to water repellent treatment. The carbon paper subjected to this water repellent treatment can be produced, for example, by impregnating carbon paper with a mixed liquid in which carbon and Teflon (registered trademark) are mixed. Instead of carbon paper, for example, carbon felt, carbon cloth, etc. may be used.

  The configuration of the MEA 100 with diffusion layer to be evaluated is not limited to this, and the MEA 100 with diffusion layer having various configurations can be evaluated. For example, the MEA 100 with a diffusion layer in which the diffusion layer 130 is disposed only on one side of the MEA 115 can also be evaluated.

A2. Evaluation Method An evaluation method according to the present invention using the evaluation device 10 will be described. The adhesion between the MEA 115 and the diffusion layer 130 evaluated by this evaluation method means that, when the diffusion layer 130 is laminated on the catalyst layer 120, for example, the catalyst layer 120 is constituted by the water repellency of the diffusion layer 130. This is the presence or absence of pores (gap) between the catalyst layer 120 and the diffusion layer 130 caused by catalyst ink repelling or the like. The state where the pores do not exist or is small even if they are present is regarded as good adhesion, and the state where the pores are present in a predetermined amount or more is regarded as poor adhesion.

  FIG. 2 is a flowchart for explaining the evaluation method according to the first embodiment. FIG. 3 is a schematic diagram for explaining an evaluation method according to the first embodiment. First, the MEA 100 with a diffusion layer to be evaluated is prepared (step S100). Then, the prepared MEA 100 with a diffusion layer is assembled to the pressing device 500 (step S110). Specifically, the MEA 100 with a diffusion layer is disposed on the porous conductor 200. At this time, when the MEA 100 with diffusion layer to be evaluated includes a plurality of bonding surfaces (interfaces) of the catalyst layer 120 / diffusion layer 130, the diffusion layer 130 constituting the bonding surface for evaluating the adhesion is attached with the diffusion layer. It arrange | positions so that it may become the upper surface of MEA100. The MEA with diffusion layer 130 having the diffusion layer 130 on only one of the MEAs 115 is also arranged so that the diffusion layer 130 is on the upper side. Thereafter, the conductor 300 with the gas flow path is disposed on the diffusion layer 130 which is the upper surface of the MEA 100 with diffusion layer to sandwich the MEA 100 with diffusion layer, and the surface pressure of the MEA 100 with diffusion layer is stacked using the squeezing 510. Pressurize so that it is the same as the fastening pressure at the time. The surface pressure of MEA 100 with a diffusion layer is preferably set to the same level as the fastening pressure in the stacked state, but may be a pressure other than this.

  MEA 100 with a diffusion layer is impregnated with water (step S120). Specifically, as shown in FIG. 3A, the pressure of the water pump 700 through the contact surface with the porous conductor 200 by pumping water from the water pump 700 to the porous conductor 200. Alternatively, the entire MEA 100 with a diffusion layer is impregnated with water by a capillary phenomenon. This state is maintained for about 10 minutes in order to carry out the subsequent steps in a state in which the MEA 115, the pores V formed between the catalyst layer 120 / diffusion layer 130, and the diffusion layer 130 on the upper surface are impregnated with water.

  Thereafter, a dry gas is passed through MEA 100 with a diffusion layer (step S140). Specifically, as shown in FIG. 3B, a dry nitrogen gas (hereinafter simply referred to as “dry gas”) is circulated through the gas flow path 310 by the mass flow controller 600. The flow rate of the drying gas is adjusted to be about 1 NL / min. The flow rate of the drying gas may be different from this. The dry gas flowing through the gas flow path 310 absorbs water from the diffusion layer 130 by contacting the surface of the diffusion layer 130. The diffusion layer 130 absorbs moisture present in the pores V on the lower surface side, as shown in the enlarged view of the X part in FIG. When moisture is reduced from the inside of the pore V, the water contained in the MEA 115 is absorbed from the surface f of the catalyst layer 120 facing the pore V, and the water content of the MEA 115 is reduced. While flowing the dry gas, the supply of water to the porous conductor 200 by the water pump 700 may be continued or stopped.

  Measurement is performed by a resistance measuring instrument in a state where a dry gas is passed through the MEA 100 with a diffusion layer (step S160). Specifically, an alternating voltage of 1 kHz and ± 200 mV is applied between the upper conductor 410 and the lower conductor 420 while a dry gas is circulated through the gas flow path 310 to change the moisture content of the MEA 100 with diffusion layer. Apply and measure resistance. In this example, as the evaluation target value E indicating the degree of adhesion between the MEA 115 and the diffusion layer 130 of the MEA 100 with diffusion layer, the resistance value Rs immediately before the drying gas is circulated, and after the drying gas is circulated for 10 seconds. The difference ΔR from the resistance value Rb was used. In this embodiment, the resistance value Rb is the resistance value after the drying gas is circulated for 10 seconds, but is not limited to this. For example, the resistance value Rb may be the resistance value after the drying gas is circulated for 5 seconds. It may be a resistance value after flowing for 15 seconds.

  When the adhesion between the MEA 115 and the diffusion layer 130 is good, the pores V do not exist or exist little, so even if a dry gas is circulated, water hardly evaporates from the surface f of the catalyst layer 120, The water evaporation rate is slow. Therefore, the MEA 115 is kept in a wet state, whereby an increase in the resistance value of the MEA 100 with diffusion layer is suppressed, and the evaluation target value E becomes small. However, when the adhesion between the MEA 115 and the diffusion layer 130 is poor and there are many pores V, the area of the surface f facing the pores V increases, and the evaporation rate of water from the MEA 115 increases. Therefore, the increase in the resistance value of the MEA 100 with a diffusion layer accompanying the drying of the MEA 115 is fast, and the evaluation target value E increases.

  The evaluation target value E of the MEA 100 with diffusion layer is compared with the threshold value E0 (step S180). When the evaluation target value E is smaller than the threshold value E0, the adhesion between the MEA 115 and the diffusion layer 130 in the MEA 100 with diffusion layer is evaluated as good. When the evaluation target value E is larger than the threshold value E0, the adhesion between the MEA 115 and the diffusion layer 130 is evaluated as poor. The threshold value E0 is the evaluation target value E obtained in advance by performing steps S100 to S160 for the MEA 100 with a diffusion layer in which the adhesion between the MEA 115 and the diffusion layer 130 is good. When obtaining the evaluation target value E used for comparison, the time for impregnating the MEA 100 with diffusion layer with water, the flow rate of the dry gas, the time for supplying water to the porous conductor 200 by the water pump 700, and the resistance value Rb are measured. It is necessary to prepare various conditions such as the circulation time of the drying gas until it is done.

A3. Evaluation Example Two MEAs with diffusion layers having different production methods were evaluated by the above-described evaluation method. Hereinafter, the two MEAs with diffusion layers are referred to as an evaluation object 1 and an evaluation object 2, respectively. FIG. 4 is an explanatory diagram for explaining a method for producing the evaluation object 1 and the evaluation object 2.

  Evaluation object 1 is a carbon paper in which platinum-supported carbon, an electrolyte solution, water, and ethanol are mixed and dispersed with a homogenizer to produce a catalyst ink, and the electrolyte membrane 110 and water-repellent treatment are performed. The MEA 115 and the diffusion layer 135 with the catalyst layer were produced by spray coating on each diffusion layer 130, respectively. Thereafter, the MEA 115 and the diffusion layer 135 with a catalyst layer were thermocompression bonded at 140 ° C. and 3 MPa for 4 minutes to obtain an MEA 100 with a diffusion layer.

  The evaluation object 2 produced the catalyst ink similar to the evaluation object 1, and spray-coated only on the electrolyte membrane 110, and produced MEA115. Thereafter, MEA 115 and diffusion layer 130, which is a carbon paper subjected to water repellent treatment, were thermocompression bonded at 140 ° C. and 3 MPa for 4 minutes to obtain MEA 100 with diffusion layer.

  FIG. 5 is an explanatory diagram showing resistance values of the evaluation object 1 and the evaluation object 2. The evaluation method according to the present invention was applied to the evaluation object 1 and the evaluation object 2. Assuming that the threshold value is E0 = 400 mohm, the evaluation target value E1 of the evaluation target 1 is E1 = 380 mohm. Moreover, the evaluation target value E2 of the evaluation target 2 was E2 = 500 mohm.

  For the evaluation target 1, since the catalyst ink was spray-coated on the diffusion layer 130 subjected to the water repellent treatment, the adhesion between the catalyst layer 120 and the diffusion layer 130 was improved, and the generation of pores V on the joint surface was suppressed. Has been. Therefore, the evaluation target value E1 is smaller than the threshold value E0, and the adhesion is determined to be good. On the other hand, for the evaluation object 2, since the MEA 115 and the diffusion layer 130 are bonded only by thermocompression bonding, the evaluation object value E2 becomes larger than the threshold value E0 because the pores V exist on the bonding surface, and the adhesion Was determined to be bad. From the evaluation results of the evaluation object 1 and the evaluation object 2, it was confirmed that the quality of the adhesion between the MEA 115 and the diffusion layer 130 can be evaluated satisfactorily by the evaluation method according to the present invention.

  According to the fuel cell evaluation method according to the first embodiment described above, the adhesion between the MEA 115 and the diffusion layer 130 is satisfactorily evaluated by the resistance value of the MEA 100 with diffusion layer measured by changing the water content. can do. Specifically, the evaporation rate of water from the MEA 115 changes due to the pores V present on the joint surface between the catalyst layer 120 and the diffusion layer 130. Since the change in the evaporation rate is reflected in the evaluation target value E of the MEA 100 with diffusion layer, the adhesion between the MEA 115 and the diffusion layer 130 can be evaluated well.

  According to the evaluation method of the fuel cell according to the first example, the adhesion between the MEA 115 and the diffusion layer 130 can be satisfactorily evaluated by flowing a dry gas over the surface of the diffusion layer 130. Specifically, the water in the MEA 115 can be evaporated from the surface f of the catalyst layer 120 through the pores V by absorbing water from the surface of the diffusion layer 130 with the dry gas. Thereby, the change of the evaporation rate of the water from MEA115 by presence of the pore V can be made remarkable.

  According to the fuel cell evaluation method of the first example, the resistance value after the dry gas is circulated for a predetermined time (in this example, 10 seconds) is set as the evaluation target value. Therefore, the adhesion between the MEA 115 and the diffusion layer 130 can be evaluated well.

  According to the evaluation method of the fuel cell according to the first example, the evaluation of the adhesion between the MEA 115 and the diffusion layer 130 is performed using the evaluation target value of the reference membrane electrode assembly as a threshold value and comparing with this threshold value. Therefore, the influence of a change in resistance value caused by factors other than the quality of adhesion between the MEA 115 and the diffusion layer 130 can be suppressed, and the adhesion between the MEA 115 and the diffusion layer 130 can be evaluated well.

  According to the evaluation method of the fuel cell according to the first embodiment, the MEA 100 with the diffusion layer is sandwiched between the porous conductor 200 and the conductor 300 with the gas flow path so that the evaluation is performed. The property can be evaluated well. Specifically, by sandwiching MEA 100 with a diffusion layer, the adhesion of MEA 100 with diffusion layer under the same condition as that in a stacked state can be evaluated. Moreover, by disposing the MEA 100 with a diffusion layer on the porous conductor 200, the entire MEA 100 with a diffusion layer can be uniformly impregnated with water in a short time. Further, by disposing the conductor 300 with the gas flow path on the diffusion layer 130, water can be uniformly evaporated from the surface f of the catalyst layer 120, and the MEA 115 can be dried well due to the presence of the pores V. Can do.

B. Modifications Note that the present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following implementations are also possible. .

B1. Modification 1:
In this example, the evaluation target value E uses the difference ΔR between the resistance value Rs immediately before the drying gas is circulated and the resistance value Rb after the drying gas is circulated for 10 seconds. Can satisfactorily evaluate the adhesion between the MEA 115 and the diffusion layer 130 even if the resistance change amount (change rate) in an arbitrary unit period (for example, 1 second). Further, the evaluation target value E may be the evaluation target value E, not the difference ΔR between the resistance value Rs and the resistance value Rb, but the resistance value itself (for example, the resistance value Rb).

B2. Modification 2:
In this embodiment, the dry gas is circulated in order to change the water content. However, the MEA 115 is also used by a method in which the dry gas is not circulated, for example, the MEA 115 is dried by heating the air in the pores V. And the adhesion between the diffusion layer 130 and the diffusion layer 130 can be evaluated.

B3. Modification 3
In this embodiment, the MEA 100 with a diffusion layer is impregnated with water via the porous conductor 200. For example, after the MEA 100 with a diffusion layer is immersed in water, the MEA 100 with the diffusion layer is set in the evaluation device 10, or Alternatively, the MEA 100 with a diffusion layer may be impregnated with water by another method such as flowing in a gas containing water vapor.

B4. Modification 4
In this embodiment, the evaluation target value E of the MEA 100 with the diffusion layer in which the adhesion between the MEA 115 and the diffusion layer 130 is good is used as the threshold value E0. For example, the calculated value calculated from the resistance value of each component member A value other than this may be used as the threshold value.

B5. Modification 5
In this example, for the MEA 100 with a diffusion layer having a plurality of bonding surfaces of the catalyst layer 120 / diffusion layer 130, an evaluation method for one bonding surface has been described. A similar evaluation may be performed. Thereby, the adhesiveness of MEA115 and the diffused layer 130 can be evaluated favorably about the whole MEA100 with a diffused layer.

  Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that various configurations can be adopted without departing from the spirit of the present invention.

It is explanatory drawing which illustrated schematic structure of the evaluation apparatus which concerns on a 1st Example. It is a flowchart for demonstrating the evaluation method which concerns on a 1st Example. It is a schematic diagram for demonstrating the evaluation method which concerns on a 1st Example. It is explanatory drawing explaining the preparation methods of the evaluation object 1 and the evaluation object 2. FIG. It is explanatory drawing which showed the resistance value of the evaluation object 1 and the evaluation object 2. FIG.

Explanation of symbols

10 ... Evaluation device 100 ... MEA with diffusion layer
DESCRIPTION OF SYMBOLS 110 ... Electrolyte membrane 120 ... Catalyst layer 130 ... Diffusion layer 135 ... Diffusion layer with catalyst layer 150 ... Sealing member 200 ... Porous conductor 300 ... Conductor with gas flow path 310 ... Gas flow path 410 ... Upper conductor 420 ... Bottom Side conductor 500 ... Pressing device 520 ... Load cell 600 ... Mass flow controller 610 ... Blower pipe 700 ... Water pump 710 ... Water pipe 800 ... Resistance measuring instrument

Claims (7)

A fuel cell evaluation method comprising:
Preparing a membrane electrode assembly in which a diffusion layer is disposed on at least one surface;
Immersing the membrane electrode assembly in a liquid;
Changing the water content of the membrane electrode assembly immersed in a liquid, and measuring the resistance value of the membrane electrode assembly;
And a step of evaluating the adhesion between the membrane electrode assembly and the diffusion layer using the resistance value. The fuel cell evaluation method according to claim 1,
The method for evaluating a fuel cell, wherein the water content of the membrane electrode assembly is changed by flowing a dry gas over the surface of the diffusion layer. The fuel cell evaluation method according to claim 2,
The evaluation of the quality of the adhesion is a fuel cell evaluation method in which the resistance value measured after flowing the dry gas for a predetermined time is used. The fuel cell evaluation method according to claim 2,
The evaluation of the quality of the adhesion is a fuel cell evaluation method in which the amount of change in the resistance value when the dry gas is allowed to flow for a predetermined time is used. In the fuel cell evaluation method according to claim 3 or 4,
The method for evaluating a fuel cell, wherein the resistance value is a resistance value generated by applying an alternating voltage in a stacking direction of the membrane electrode assembly. 6. The fuel cell evaluation method according to claim 2, wherein:
The evaluation of the quality of the adhesion is a method for evaluating a fuel cell, which is performed by comparison with a resistance value of a membrane electrode assembly as a reference. The fuel cell evaluation method according to any one of claims 1 to 6 further includes:
A step of preparing an evaluation apparatus including a porous conductor and a conductor with a gas flow path;
Arranging the membrane electrode assembly on the porous conductor, arranging the gas channel-attached conductor on the diffusion layer, and sandwiching the membrane electrode assembly,
Immersing the membrane electrode assembly in the liquid by flowing the liquid into the porous conductor,
A dry gas is flowed to the surface of the diffusion layer through the flow path of the conductor with the gas flow path,
A method for evaluating a fuel cell, wherein a resistance value of the membrane electrode assembly is measured by applying an AC voltage between the porous conductor and the conductor with a gas flow path.

Images