JP2006038611A - Electrode structure and ionic conductance measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure the impedance value (ionic conductance) of an ion conduction polymer film highly accurately with a simple constitution. <P>SOLUTION: This electrode structure 1 is equipped with a pair of electrodes 4 held on one surface of holding members 2a, 2b and arranged oppositely so as to be able to sandwich a specimen 7, and a pressure adjuster 5 arranged on the surface on the opposite side to the surface holding the electrodes 4 of the holding member 2a and in point contact with a pressurizing means for pressurizing in the direction wherein the specimen 7 is sandwiched by the electrodes 4. When the holding members 2a, 2b are pressurized by the pressurizing means in the direction wherein the specimen 7 is sandwiched by the pair of electrodes 4, the pressure by the pressurizing means is applied to the electrodes 4 and the specimen 7 through the pressure adjuster 5 in point contact with the pressurizing means, and consequently the specimen 7 can be pressurized evenly, and accuracy when an alternating current is made to flow between the electrodes 4 and the impedance value (ionic conductance) of the specimen 7 is measured can be heightened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrode structure suitable for measuring the ionic conductivity of an ion conducting polymer membrane or a solid polymer membrane used in a fuel cell, and an ion conductivity measuring apparatus using the electrode structure.

  Fuel cells have high energy density and extremely low emissions that are harmful to the environment, so they are promising candidates for solving environmental problems such as global warming. Therefore, various types of fuel cells such as solid polymer type and DMFC (direct methanol) type have been actively developed as power sources for automobiles and various electronic devices.

  In such a fuel cell, it is MEA (an assembly of an ion conducting polymer membrane and an electrode) that is the heart of the fuel cell that greatly affects its characteristics. The MEA has a structure in which a solid polymer ion conducting polymer membrane is sandwiched between electrodes having a catalyst.

  As such an ion conductive polymer membrane, it is said that the only Nafion membrane (a product name of DuPont) is currently the only one that can withstand the commercialization of fuel cells.

  However, the Nafion membrane has problems such as a low usable temperature of 120 ° C. or lower and swelling with moisture, and is very expensive.

  For this reason, research is being carried out with the aim of realizing an ion-conducting polymer membrane with lower performance and higher performance than the Nafion membrane.

  In order to realize an ion conducting polymer membrane with performance exceeding that of the Nafion membrane, it is necessary to measure the ion conductivity of the ion conducting polymer membrane with high accuracy and efficiency. The ionic conductivity of an ion conducting polymer membrane can be measured by measuring the impedance value, which is the resistance when an alternating current is passed through the ion conducting polymer membrane. A method for easily and accurately measuring the above has not been proposed yet.

  As a method for measuring the impedance value (ion conductivity) in the film thickness direction of the ion conductive polymer film, a method using a sealed cell disclosed in Non-Patent Document 1 is known.

  In addition, in order to accurately measure the impedance value (ion conductivity) of the ion conductive polymer membrane, a method of manufacturing membrane electrodes by hot pressing on both surfaces of the ion conductive polymer membrane is known.

  As a simple measurement method, a method is known in which four probe electrodes are pressed against one surface of an ion conducting polymer film and the impedance value (ion conductivity) in the plane direction is measured.

Electrochemical Measurement Manual: Section 3.4, edited by the Institute of Electrical Engineers of Japan Figure 3.12

  However, with the method disclosed in Non-Patent Document 1, the configuration of the apparatus is complicated, and high-precision measurement is difficult.

  In addition, the method of producing membrane electrodes by hot pressing on both surfaces of the ion conducting polymer membrane requires a lot of time and labor to produce the membrane electrodes by hot pressing, and thus cannot be easily measured. .

  Moreover, although the method of measuring the impedance value (ionic conductivity) in the surface direction of the ion conducting polymer membrane is simple, there is a drawback that the impedance value (ionic conductivity) in the film thickness direction cannot be obtained.

  An object of the present invention is to measure the impedance value (ion conductivity) of an ion conducting polymer membrane with high accuracy with a simple configuration.

  An electrode structure according to a first aspect of the present invention includes a pair of electrodes that are held on one surface of a holding member and arranged to face each other so as to sandwich a subject, and a surface opposite to the surface of the holding member that holds the electrode A pressure adjusting body that is disposed above and that makes point contact with a pressurizing unit that pressurizes the subject with the electrode in a direction in which the subject is sandwiched.

  According to a second aspect of the present invention, in the electrode structure according to the first aspect, a cushioning material is interposed between the electrode and the holding member.

  According to a third aspect of the present invention, there is provided an ion conductivity measuring apparatus according to the first or second aspect, wherein the electrode structure according to the first or second aspect and the pressure adjusting body are in point contact, and the holding member is disposed in a direction in which the electrode sandwiches the subject. Pressurizing means for pressurizing; and a measuring instrument connected to the pair of electrodes and measuring an impedance value of the subject located between the electrodes.

  According to a fourth aspect of the present invention, in the ion conductivity measuring apparatus according to the third aspect of the present invention, the pressure-sensitive element attached on the holding member and a pressure gauge connected to the pressure-sensitive element are provided.

  According to a fifth aspect of the present invention, in the ion conductivity measuring apparatus according to the third or fourth aspect, the pressurizing means is a movable part that moves in a direction of contacting and separating from the pressure adjusting body by rotating around a center line. It has.

A sixth aspect of the present invention is the ion conductivity measuring apparatus according to any one of the third to fifth aspects, wherein the pressure applied to the subject by the pressurizing means is set to 1.0 × 10 ⁵ Pa or more. .

According to a seventh aspect of the present invention, in the ion conductivity measuring device according to any one of the third to fifth aspects, the area of the subject is set to 5 mm ² or less.

  An eighth aspect of the present invention is the ion conductivity measuring device according to any one of the third to fifth aspects, wherein a measurement voltage per unit thickness applied to the subject is 0.1 to 1.0 mV. / Μm.

  According to the electrode structure of the first aspect of the present invention, when the holding member is pressurized by the pressurizing unit in a direction in which the subject is sandwiched between the pair of electrodes, the pressure of the pressurizing unit is applied to the pressurizing unit. Since it acts on the electrode and the subject via the pressure regulator that makes point contact, the subject can be evenly pressurized, and an alternating current is passed between the electrodes to pass the impedance value (ion conductivity) of the subject. In addition, the electrode structure is a structure in which the pressure adjusting body is disposed on the surface of the holding member opposite to the surface holding the electrode, and the electrode structure can be simplified. It can be a structure.

  According to the electrode structure of the second aspect of the present invention, the subject can be more evenly pressurized by interposing the buffer material.

  According to the ionic conductivity measuring device of the third aspect of the invention, since the electrode structure according to the first or second aspect is used, the impedance value (ionic conductivity) of the subject can be measured with a simple configuration. Can be done with precision.

  According to the ion conductivity measuring device of the invention described in claim 4, the pressure applied by the pressurizing means can be accurately measured using the pressure sensitive element and the pressure gauge, and the impedance value of the subject (ion conduction) Degree) can be measured with higher accuracy.

  According to the ion conductivity measuring device of the fifth aspect of the present invention, the pressure acting on the pressure adjusting body can be varied by rotating the movable part around the center line. The rotating force is not transmitted to the pressure regulator even if it is rotated in the direction of rotation, so the rotational force does not act on the electrode and the subject, and the impedance value (ion conductivity) of the subject is not distorted. Can be measured with high accuracy.

According to the ion conductivity measuring apparatus of the sixth aspect of the present invention, when the pressure on the subject is set to 1.0 × 10 ⁵ Pa or more, there is almost no change in the measured value of the impedance value (ion conductivity), and The impedance value (ion conductivity) of the specimen can be measured with high accuracy.

According to the ionic conductivity measuring device of the seventh aspect of the invention, the smaller the interfacial capacitance between the electrode and the specimen, the higher the reliability of the measured impedance value (ionic conductivity), and the area of the specimen is 5 mm ² or less. Thus, the desired impedance value (ion conductivity) can be measured.

  According to the ion conductivity measuring apparatus of the eighth aspect of the present invention, by setting the measurement voltage per unit thickness applied to the subject to 0.1 to 1.0 mV / μm, the impedance value of the subject (ion Conductivity) can be measured stably.

  Prior to the description of the embodiment of the present invention, the measurement of the impedance value (ion conductivity) of the ion conducting polymer membrane as the subject was performed with various measuring devices, and these are based on FIGS. 10 to 12. explain.

  First, in the measurement apparatus shown in FIG. 10, an ion conductive polymer film 101 having an electrode 100 bonded and fixed on one surface is placed on a glass table 102, and the direction of the electrode 100 is in contact with the glass table 102. ing. A container 104 formed of an insulating material containing a sulfuric acid aqueous solution 103 is placed on the opposite surface of the ion conducting polymer film 101 placed on the glass table 102, and a weight 105 is placed on the container 104. Is placed. An electrode (for example, an Au electrode) 106 is suspended in the sulfuric acid aqueous solution 103, and a measuring device 107 that measures the impedance value (ion conductivity) of the ion conductive polymer film 101 is connected between the electrodes 100 and 106.

  In the measuring apparatus shown in FIG. 11, an ion conductive polymer film 101 having an electrode 100 bonded and fixed on one surface is placed on a glass table 102, and the opposite side of the ion conductive polymer film 101 placed on the glass table 102. The electrode 108 is placed on the surface of the, and the weight 105 is placed on the electrode 108 via the pressing member 109. A measuring device 107 for measuring the impedance value (ion conductivity) of the ion conducting polymer membrane 101 is connected between the electrodes 100 and 108.

  When the impedance value (ion conductivity) of Nafion 117, which is a typical film as the ion conductive polymer film 101, was measured using the measurement apparatus shown in FIGS. 10 and 11, an accurate measurement result could not be obtained. This is considered to be because the pressure could not be applied uniformly to the ion conducting polymer film 101. In the measuring apparatus shown in FIGS. 10 and 11, when the placement surface of the weight 105 is inclined, the pressure applied to the ion conductive polymer film 101 is not uniform, and this causes accurate measurement. Impedance values cannot be measured.

  In addition, since the measurement apparatus shown in FIG. 10 uses liquid (sulfuric acid aqueous solution 103), a structure for preventing liquid leakage is necessary, so that the structure of the apparatus is complicated and the handling of the apparatus becomes complicated.

  In addition, when a screw-type pressurizing unit capable of changing the pressure applied to the ion conducting polymer film 101 is used instead of the mounting weight 105, the rotation when the screw of the pressurizing unit is rotated is performed. The rotation is transmitted to the container 104 and the pressing member 109 and the rotation of the ion conducting polymer film 101 due to the screw being turned, and the ion conducting polymer film 101 is kinked, resulting in a significant measurement error.

  In the measuring apparatus shown in FIG. 12, an ion conductive polymer film 101 having an electrode 100 bonded and fixed on one surface is placed on a glass table 102. On the opposite surface of the ion conducting polymer film 101 placed on the glass table 102, one end of an insulating rod 111 such as plastic in which a thin Pt line 110 having a diameter of about 0.3 mm is embedded is Pt. It is pressed together with one end of the wire 110, and a weight 105 is placed on the other end of the insulating rod 111. A measuring device 107 for measuring the impedance value (ion conductivity) of the ion conducting polymer film 101 is connected between the electrode 100 and the Pt line (electrode) 110.

  In this measuring apparatus, since the area of the Pt line (electrode) 111 in contact with the ion conductive polymer film 101 becomes small, the pressure acting between the electrodes 100 and 110 of the ion conductive polymer film 101 can be made uniform, The measurement result is closer to the nominal impedance value (ion conductivity) of the Nafion membrane as compared to the measurement apparatus of FIGS. However, an error with respect to the true impedance value (ion conductivity) is still occurring.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an electrode structure 1. This electrode structure 1 includes a pair of glass plates 2a and 2b, which are holding members, and an insulating material 3 and an insulating material provided on one surface of the glass plates 2a and 2b. 3 is composed of an electrode 4 fixedly bonded on 3 and a pressure adjusting body 5 bonded and fixed on the surface of one glass plate 2a opposite to the surface on which the electrode 4 is provided. In addition, when sufficient insulation can be ensured by the glass plates 2a and 2b, the electrode 4 may be bonded and fixed on the glass plates 2a and 2b without providing the insulating material 3. A lead wire 6 is connected to each electrode 4 by a spot welder or the like. The pair of glass plates 2 a and 2 b are arranged so that the electrodes 4 are opposed to each other, and the ion conductive polymer film 7 as a subject is sandwiched between the opposed electrodes 4.

  The electrodes 4 adhered and fixed on the insulating material 3 of the glass plates 2a and 2b are arranged at crossing positions as shown in FIG. 2, and the crossing and overlapping portions are effective electrode areas.

  The pressure adjusting body 5 has a surface bonded to the glass plate 2a formed in a planar shape that comes into surface contact with the glass plate 2a, and an opposite surface formed in a convexly curved surface. The apex of the convexly curved surface is configured to make point contact with a pressurizing unit that pressurizes the glass plate 2a in a direction in which the ion conductive polymer film 7 is sandwiched between the pair of electrodes 4.

  In such a configuration, when the impedance value (ion conductivity) of the ion conductive polymer film 7 is measured using the electrode structure 1, the lead wires 6 of the pair of electrodes 4 are connected to the ion conductive polymer film 7. The glass plates 2a and 2b are pressurized by a pressurizing means in a direction in which the pair of electrodes 4 sandwich the ion conducting polymer film 7 with a measuring instrument for measuring the impedance value (ion conductivity) of the electrode. The measuring instrument has a function of measuring the impedance value of the ion conducting polymer membrane 7 and calculating the ion conductivity of the ion conducting polymer membrane 7 from the measured impedance value.

  By adjusting the pressing force of the pressurizing means so that the pressure acting on the ion conducting polymer membrane 7 becomes an appropriate value, and applying an alternating current between the electrodes 4, the impedance value of the ion conducting polymer membrane 7 can be set. The ion conductivity of the ion conducting polymer membrane 7 can be calculated from the measured impedance value.

  In this measurement, when the pressurizing means makes point contact with the pressure adjusting body 5, the pressure from the pressurizing means acting on the ion conducting polymer film 7 via the pressure adjusting body 5 is applied to the ion conducting polymer film 7. On the other hand, it is uniformly dispersed. As a result, the impedance value of the ion conducting polymer film 7 can be measured in a state in which the pressure is uniformly applied to the ion conducting polymer film 7, so that accurate measurement can be performed. The ion conductivity of the molecular film 7 can be measured with high accuracy.

  This electrode structure 1 is a structure in which the pressure adjusting body 5 is bonded and fixed on the surface of the glass plate 2a opposite to the surface holding the electrode 4, and has a simple structure.

  In this embodiment, the case where the pressure adjusting body 5 is bonded and fixed to one glass plate 2a has been described as an example. However, the pressure adjusting body 5 may be bonded and fixed to the other glass plate 2b, or both glasses may be fixed. You may adhere and fix to the plates 2a and 2b.

  Further, in the present embodiment, the case where the surface on the side facing the pressurizing unit is curved as the pressure adjusting body 5 is described as an example, but the shape of the pressure adjusting body 5 is in this shape. The shape is not limited as long as it has a shape that makes point contact with the pressing means. For example, a pressure adjusting body 5A having a quadrangular pyramid shape as shown in FIG. 3A, and pressure adjusting bodies 5B and 5C having a shape combining a quadrangular prism and a quadrangular pyramid as shown in FIGS. 3B and 3C. It is good.

  A second embodiment of the present invention will be described with reference to FIG. Note that in this embodiment and other embodiments described below, the same portions as those described in the preceding embodiments are denoted by the same reference numerals, and description thereof is also omitted.

  In the electrode structure 10 of the present embodiment, a pair of glass plates 2a and 2b, which are holding members, and an elastic buffer material 11 provided on one surface of the glass plates 2a and 2b are bonded and fixed onto the buffer material 11. The electrode 4 is composed of a pressure regulator 5 that is bonded and fixed on the surface of the one glass plate 1 opposite to the surface on which the electrode 4 is provided. As the buffer material 11, silicon rubber having elasticity and insulation can be used. In addition, when sufficient insulation can be ensured by the glass plates 2a and 2b, the buffer material 11 may not have insulation. A lead wire 6 is connected to each electrode 4 by a spot welder or the like. The pair of glass plates 2 a and 2 b are arranged so that the electrodes 4 are opposed to each other, and the ion conductive polymer film 7 as a subject is sandwiched between the opposed electrodes 4.

  In such a configuration, when the impedance value (ion conductivity) of the ion conducting polymer film 7 is measured using the electrode structure 10, a pair of electrodes 4 is formed as in the first embodiment. The lead wire 6 is connected to a measuring instrument for measuring the impedance value (ion conductivity) of the ion conducting polymer film 7, and the glass plate is pressed by a pressurizing means so that the pair of electrodes 4 sandwich the ion conducting polymer film 7. Pressurize 2a and 2b.

  In this measurement, when the pressurizing means makes point contact with the pressure adjusting body 5, the pressure from the pressurizing means acting on the ion conducting polymer film 7 via the pressure adjusting body 5 is applied to the ion conducting polymer film 7. On the other hand, it is uniformly dispersed. As a result, the impedance value of the ion conducting polymer film 7 can be measured in a state in which the pressure is uniformly applied to the ion conducting polymer film 7, so that accurate measurement can be performed. The ion conductivity of the molecular film 7 can be measured with high accuracy.

  Further, since the electrode structure 10 has the buffer material 11 interposed between the glass plates 2a, 2b and the electrode 4, the ion conductive polymer membrane 7 is further increased when pressurized by the pressurizing means. It is possible to pressurize evenly, the impedance value of the ion conducting polymer membrane 7 can be measured with higher accuracy, and the ion conductivity of the ion conducting polymer membrane 7 can be measured with higher accuracy. Can do.

  A third embodiment of the present invention will be described with reference to FIG. The ion conductivity measuring device 20 according to the present embodiment is in point contact with the electrode structure 10 described in the second embodiment and the pressure regulator 5, and the pair of electrodes 4 sandwich the ion conductive polymer film 7. Measuring means for measuring the impedance value (ion conductivity) of the ion conducting polymer membrane 7 connected between the pair of electrodes 4 and positioned between the electrodes 4. 22.

  The pressurizing means 21 has a micrometer-type movable portion 23 that can be rotated around a center line. The movable portion 23 is arranged at a position where the movable side end surface is in point contact with the pressure adjusting body 5 and is movable. The part 23 is moved in the direction of contacting and separating from the pressure adjusting body 5 by being rotated around the center line. The pressurizing means 21 is provided with a scale for detecting the rotational operation amount of the movable portion 23.

  The measuring device 22 includes a power supply unit that generates an alternating current, a measuring unit that measures an impedance value of the ion conducting polymer film 7 by measuring an alternating current flowing between the electrodes 4, and an ion conducting polymer film from the measured impedance value. 7 and the like.

  In such a configuration, when the impedance value (ion conductivity) of the ion conducting polymer membrane 7 is measured using the ion conductivity measuring device 20, the movable part 23 of the pressurizing means 21 is rotated and operated. The glass plate 2a is pressurized and adjusted so that the pressure for sandwiching the ion conducting polymer film 7 between the electrodes 4 becomes a target value. Whether or not the pressure has reached a target value is determined by looking at a scale indicating the amount of rotation of the movable portion 23.

  After adjusting the pressure for sandwiching the ion conducting polymer film 7 to a target value, the impedance value of the ion conducting polymer film 7 can be measured by applying an alternating current between the electrodes 4 and measured. The ion conductivity of the ion conducting polymer membrane 7 can be calculated from the impedance value.

  At the time of this measurement, the movable side end surface of the movable portion 23 of the pressurizing means 21 is in point contact with the pressure adjusting body 5, so that the applied pressure acting on the ion conducting polymer film 7 via the pressure adjusting body 5 is obtained. The pressure from the pressure means 21 is uniformly dispersed with respect to the ion conductive polymer film 7. As a result, the impedance value of the ion conducting polymer film 7 can be measured in a state in which the pressure is uniformly applied to the ion conducting polymer film 7, so that accurate measurement can be performed. The ion conductivity of the molecular film 7 can be measured with high accuracy.

The graph of FIG. 6 shows the results of measuring the ionic conductivity of the ion conducting polymer membrane 7 with the ion conductivity measuring device 20 while varying the pressure on the ion conducting polymer membrane 7. From this graph, when the pressure for pressurizing the ion conducting polymer membrane 7 is set to 1.0 × 10 ⁵ Pa or more, preferably 1.9 × 10 ⁵ Pa or more, there is almost no change in ionic conductivity and stable. It was found that measurement was possible. Therefore, in the present invention, the pressure for pressurizing the ion conducting polymer film 7 is set to 1.0 × 10 ⁵ Pa or more.

The ionic conductivity measurement of the ionic conductivity of the polymer film 7 in the ion conductivity measuring device 20, when the conducted by varying the area of the ion conductive polymer membrane 7 to ^{1mm 2, 4mm 2, 16mm 2} , 40mm 2 The results are shown in the graph of FIG. From this graph, it was found that the smaller the area of the ion conducting polymer film 7, the higher the reliability of the measured ion conductivity. On the other hand, in view of the fact that the larger the area of the ion conducting polymer film 7 is, the easier the handling at the time of measurement is, the area of the ion conducting polymer film 7 is set to 5 mm ² or less in the present invention. This makes it possible to measure the desired reliable ion conductivity.

  When the magnitude of the measurement voltage applied to the ion conducting polymer film 7 was examined, it was found that 50 to 100 mV can be stably measured in Nafion 117 having a thickness of 175 μm. From the result, the voltage applied to the ion conducting polymer film 7 per unit thickness is calculated as 0.2 to 0.6 mV / μm, and in the present invention, the useful measurement voltage is 0.1 to 1.0 mV / μm. It is said.

  In the present embodiment, the micrometer type movable portion 23 has been described as an example. However, as shown in FIG. 8, the storage cylinder portion 25a is attached to one end side of the storage cylinder portion 25a and rotated. The rotation operation part 25b movable in the axial direction of the storage cylinder part 25a, the sliding part 25c slidably attached to the other end side of the storage cylinder part 25a, and the rotation operation part 25b and the sliding part 25c You may use the movable part 25 of the type provided with the spring 25d interposed between.

  A fourth embodiment of the present invention will be described with reference to FIG. The ion conductivity measuring device 30 of this embodiment includes a pressure sensitive element 31 and a pressure gauge 32 connected to the pressure sensitive element 31 with respect to the ion conductivity measuring device 20 described in the third embodiment. It is added.

  For example, a piezoelectric element can be used as the pressure sensitive element 31, and the pressure sensitive element 31 is interposed between the glass plate 2 b and the buffer material 11.

  In such a configuration, according to the ion conductivity measuring device 30, the pressure applied by the pressurizing means 21 can be accurately measured using the pressure sensitive element 31 and the pressure gauge 32. For this reason, the impedance value (ion conductivity) of the ion conducting polymer film 7 can be measured with higher accuracy.

It is the schematic which shows the electrode structure of the 1st Embodiment of this invention. It is a top view which shows the positional relationship of the electrode located facing. It is a perspective view which shows the modification of a pressure adjustment body. It is the schematic which shows the electrode structure of the 2nd Embodiment of this invention. It is the schematic which shows the ion conductivity measuring apparatus of the 3rd Embodiment of this invention. It is a graph which shows the result of having performed the measurement of the ionic conductivity of the ion conductive polymer film in an ion conductivity measuring device, changing the pressure with respect to an ion conductive polymer film. It is a graph which shows the result of having performed the measurement of the ionic conductivity of the ion conductive polymer film in an ion conductivity measuring apparatus by changing the area of an ion conductive polymer film. It is the schematic which shows the modification of the movable part of a pressurization means. It is the schematic which shows the ion conductivity measuring apparatus of the 4th Embodiment of this invention. It is the schematic which shows the comparative example of the measuring apparatus which measured the impedance value (ionic conductivity) of the ion conductive polymer film. It is the schematic which shows the other comparative example of the measuring apparatus which measured the impedance value (ionic conductivity) of the ion conductive polymer film. It is the schematic which shows the other comparative example of the measuring apparatus which measured the impedance value (ionic conductivity) of the ion conductive polymer film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode structure 2a, 2b Holding member 4 Electrode 5 Pressure adjusting body 5A Pressure adjusting body 5B Pressure adjusting body 5C Pressure adjusting body 7 Subject 10 Electrode structure 11 Buffer material 20 Ion conductivity measuring device 21 Pressurizing means 22 Measuring device 30 Ion conductivity measuring device 31 Pressure sensitive element 32 Pressure gauge

Claims (8)

A pair of electrodes that are held on one surface of the holding member and arranged to face each other so as to hold the subject; and
A pressure adjusting body that is disposed on a surface opposite to a surface of the holding member that holds the electrode, and that makes point contact with a pressurizing unit that pressurizes the subject in a direction of sandwiching the subject;
An electrode structure comprising:   The electrode structure according to claim 1, wherein a buffer material is interposed between the electrode and the holding member. The electrode structure according to claim 1 or 2,
A pressurizing unit that makes point contact with the pressure adjusting body and pressurizes the holding member in a direction in which the electrode sandwiches the subject;
A measuring instrument connected to the pair of electrodes and measuring an impedance value of the subject located between the electrodes;
An ionic conductivity measuring device comprising: A pressure sensitive element mounted on the holding member;
A pressure gauge connected to the pressure sensitive element;
The ionic conductivity measuring device according to claim 3 comprising:   5. The ion conductivity measuring apparatus according to claim 3, wherein the pressurizing unit includes a movable portion that moves in a direction in which the pressure adjusting body contacts and separates by rotating around a center line. The ion conductivity measuring apparatus according to claim 3, wherein the pressure applied to the subject by the pressurizing unit is set to 1.0 × 10 ⁵ Pa or more. The ion conductivity measuring apparatus according to claim 3, wherein an area of the subject is set to 5 mm ² or less. 6. The ion conductivity measuring device according to claim 3, wherein a measurement voltage per unit thickness applied to the subject is set to 0.1 to 1.0 mV / μm.

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