WO2018216847A1 - Cellule pour mesurer la conductivité ionique d'une membrane échangeuse d'ions et procédé de mesure de conductivité ionique au moyen de celle-ci - Google Patents

Cellule pour mesurer la conductivité ionique d'une membrane échangeuse d'ions et procédé de mesure de conductivité ionique au moyen de celle-ci Download PDF

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Publication number
WO2018216847A1
WO2018216847A1 PCT/KR2017/007510 KR2017007510W WO2018216847A1 WO 2018216847 A1 WO2018216847 A1 WO 2018216847A1 KR 2017007510 W KR2017007510 W KR 2017007510W WO 2018216847 A1 WO2018216847 A1 WO 2018216847A1
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WO
WIPO (PCT)
Prior art keywords
exchange membrane
electrode
ion exchange
cell
measuring
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PCT/KR2017/007510
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English (en)
Korean (ko)
Inventor
이혜진
엄성현
Original Assignee
경북대학교 산학협력단
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Publication of WO2018216847A1 publication Critical patent/WO2018216847A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/22—Measuring resistance of fluids

Definitions

  • the present invention relates to a cell for measuring ion conductivity of an ion exchange membrane used in a fuel cell and the like and a method for measuring ion conductivity using the same.
  • a fuel cell is a power generation system that converts chemical energy into electrical energy.
  • selective ion conduction through the polymer electrolyte ion exchange membrane is essential.
  • a membrane electrode assembly (MEA) is used for ion conduction.
  • the membrane electrode assembly has a configuration in which an ion exchange membrane is interposed between an electrode carrying a catalyst made of an anode, which is a positive electrode (+), and a cathode, which is a cathode ( ⁇ ).
  • a polymer electrolyte membrane or the like is used for the ion exchange membrane, and ion conduction formation in the thickness direction of the membrane occurs in the system.
  • the ion conductivity of the ion exchange membrane is an index that quantitatively shows the conductivity of ions among the characteristics of the membrane.
  • a constant current wave is applied to the film at high frequency and low frequency to know the resistance configuration through impedance analysis.
  • the ion conductivity can be calculated by considering the inverse of the resistance and the thickness of the ion exchange membrane which was the target of the resistance, and the ion conductivity measurement of the ion exchange membrane should be measured in the thickness direction of the surface of the ion exchange membrane according to the arrangement of the electrodes.
  • two or more electrodes need to be positioned to contact both surfaces of the ion exchange membrane, and a plurality of electrodes and the ion exchange membrane need to be fixed to prevent the electrodes and the ion exchange membrane from moving when measuring the ion conductivity.
  • the electrolyte contained in the ion exchange membrane may be discharged to the outside, and thus there is a problem in that performance decreases as the ion exchange membrane is dried or deteriorated.
  • the inventors of the present invention have completed the present invention to prevent deterioration of the performance of the ion exchange membrane and to improve the reliability of the measured ion conductivity when measuring the ion conductivity of the ion exchange membrane.
  • An object of the present invention is to prevent the degradation of the performance due to drying and deterioration caused by the ion conductivity measurement process by maintaining a constant moisture content of the ion exchange membrane when measuring the ion conductivity of the ion exchange membrane, it is exposed to the outside during the measurement process It is an object of the present invention to provide a cell for measuring ion conductivity of an ion exchange membrane.
  • Another object of the present invention is to provide a method for measuring the ion conductivity of an ion exchange membrane using a cell for measuring the ion conductivity of the ion exchange membrane.
  • the present invention is a cell for measuring the ion conductivity of the ion exchange membrane, the first electrode in contact with one surface of the ion exchange membrane; A second electrode contacting the other surface of the ion exchange membrane opposite to the first electrode; A first electrode holder having a solution moving passage penetrating the upper and lower parts and accommodating the first electrode through a through hole formed therein; A second electrode holder accommodating the second electrode through a through hole formed therein and bonded to the first electrode holder with the ion exchange membrane interposed therebetween; And a cell connector coupled to any one of the bonded first electrode holder 30 and the second electrode holder such that both surfaces of the ion exchange membrane are compressed or decompressed by the first electrode and the second electrode.
  • a cell for measuring ion conductivity of an ion exchange membrane is provided.
  • the present invention is a method for measuring the ion conductivity using a cell for measuring the ion conductivity of the ion exchange membrane according to the present invention, (1) the ion exchange membrane is the first electrode and the second electrode Bonding the first electrode holder and the second electrode holder to be positioned between the first and second electrode holders; (2) combining the cell connector with any one of the bonded first electrode holder and the second electrode holder to compress the ion exchange membrane; And (3) measuring a resistance value of the ion exchange membrane by supplying current to the first electrode and the second electrode.
  • the ion conductivity measuring cell of the ion exchange membrane according to the present invention can stably discharge the residual solution discharged from the ion exchange membrane when measuring the ion conductivity of the ion exchange membrane, thereby minimizing the ion conductivity analysis error, constant water content of the ion exchange membrane In this case, the deterioration of the ion exchange membrane can be prevented, and the electrode portion and the ion exchange membrane are blocked from the outside to block the influx of contaminants, thereby improving the reliability of the measured ion conductivity.
  • FIG. 1 illustrates a combined perspective view of a cell for measuring ion conductivity of an ion exchange membrane according to an embodiment of the present invention.
  • Figure 2 shows a cross-sectional view of the coupling of the cell for measuring the ion conductivity of the ion exchange membrane according to an embodiment of the present invention.
  • Figure 3 shows an exploded perspective view of the cell for measuring the ion conductivity of the ion exchange membrane according to an embodiment of the present invention.
  • Figure 4 shows an exploded cross-sectional view of the cell for measuring the ion conductivity of the ion exchange membrane according to an embodiment of the present invention.
  • the present invention relates to a cell for measuring ion conductivity of an ion exchange membrane used in a fuel cell and the like and a method for measuring ion conductivity using the same.
  • the invention provides a cell for measuring the ion conductivity of the ion exchange membrane.
  • FIG. 1 is a perspective view of a combination of the cell for measuring the ion conductivity of the ion exchange membrane according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view of a cell for measuring the ion conductivity of the ion exchange membrane according to an embodiment of the present invention
  • Figure 3 4 is an exploded perspective view of a cell for measuring ion conductivity of an ion exchange membrane according to an embodiment of the present invention
  • FIG. 4 is an exploded cross-sectional view of a cell for measuring ion conductivity of an ion exchange membrane according to an embodiment of the present invention.
  • the cell for measuring ion conductivity of an ion exchange membrane includes a first electrode 10, a second electrode 20, and a first electrode holder 30. And a second electrode holder 40 and a cell connector 50.
  • the first electrode 10 includes a first electrical input part 11, a first electrode body part 12, and a first contact part 13.
  • the first electrode body 12 may be provided in a cylindrical or polygonal shape.
  • the first electrical input unit 11 is provided on one side of the first electrode body 12, and the first contact unit 13 is provided on the other side of the first electrode body 12 to be in contact with the ion exchange membrane 60.
  • the first electrical input unit 11 is a portion in which a current supplied from the outside is input, and the first contact portion 13 is a portion in contact with the ion exchange membrane 60 to be measured when measuring ion conductivity. It may be characterized by having a larger cross-sectional area than the cross-sectional area of the electrode body (12).
  • the second electrode 20 is opposed to the first electrode 10, and is coupled between the first electrode 10 and the second electrode 20 such that the ion exchange membrane 60 to be measured is positioned.
  • the second electrode 20 includes a second electrical input portion 21, a second electrode body portion 22, and a second contact portion 23.
  • the second electrode body portion 22 has a cylindrical or polygonal shape. It may be provided as.
  • the second electrical input unit 21 is a portion to which the current supplied from the outside is input, the second electrical input unit 21 is provided on one side of the second electrode body 22, the other side of the ion exchange membrane A second contact portion 23 in contact with 60 is provided.
  • the second contact portion 23 is a portion in contact with the ion exchange membrane 60 to be measured when measuring the ion conductivity, and may have a cross-sectional area larger than that of the second electrode body portion 22.
  • One of the first electrode 10 and the second electrode 20 serves as an anode, which is a positive electrode, and the other serves as a cathode, a cathode.
  • the first electrode holder 30 includes a first through hole 31, a first inner space 32, and a solution movement passage 35.
  • the first electrode holder 30 accommodates the first electrode 10 through the first through hole 31 formed in the center, and provides a guide for the first electrode 10 to be located in the center.
  • the first through hole 31 is formed to penetrate the upper and lower portions of the first electrode holder 30, and may have an inner shape of a circular or polygonal pillar according to the shape of the first electrode body 12.
  • the first inner space 32 is a place where the first contact portion 13 is accommodated and is provided below the first through hole 31.
  • the solution movement passage 35 is formed through the upper and lower portions of the first electrode holder 30, and discharges the residual solution discharged when measuring the ion conductivity of the ion exchange membrane 60, or the water content of the ion exchange membrane 60 It is used as a passage for supplying an electrolyte solution to keep it constant.
  • the solution movement passage 35 may be positioned so as not to be connected to the first inner space 32.
  • the internal shape of the solution movement passage 35 is not particularly limited as long as it is a shape that can be used for applications such as discharging residual solution or adding electrolyte solution.
  • the solution transfer passage 35 may have an inner shape of a circular or polygonal pillar.
  • the second electrode holder 40 includes a second through hole 41 and a second inner space 42.
  • the second electrode holder 40 accommodates the second electrode 20 through the second through hole 41 formed in the center, and provides a guide so that the second electrode 20 can be located in the center.
  • the second through hole 41 may be formed to penetrate the upper and lower portions of the second electrode holder 40, and may have an inner shape of a circular or polygonal pillar according to the shape of the second electrode body 22.
  • the second inner space 42 is a place where the second contact portion 23 is accommodated and is provided on an upper portion of the second through hole 41.
  • the first electrode holder 30 and the second electrode holder 40 are coupled to each other with an ion exchange membrane 60 as an ion conductivity measurement object interposed therebetween to form a cell, and the lower surface of the first electrode holder 30 Upper surfaces of the second electrode holders 40 are respectively bonded to both surfaces of the ion exchange membrane 60.
  • the coupling between the first electrode holder 30 and the second electrode holder 40 is not permanent, and is simply coupled and released to facilitate replacement of the ion exchange membrane 60 to be measured. .
  • the first coupling part 33 is formed below the first electrode holder 30 to have a diameter smaller than that of the upper part, and the first electrode is disposed on the second electrode holder 40.
  • the coupling part 33 may include a second coupling part 43 that may be accommodated, and the outer circumferential surface of the first coupling part 33 is in close contact with the inner circumferential surface of the second coupling part 43 to be coupled. It may be characterized by.
  • the cell is formed by the first electrode holder 30 and the second electrode holder 40.
  • the first electrode 10, the second electrode 20, and the ion exchange membrane 60 positioned inside of the cell may be completely blocked from the outside of the cell. In this case, pollutants introduced from the outside can be blocked at source, and the water content of the ion exchange membrane to be measured inside the cell can be kept constant, thereby improving the reliability of the measured ion conductivity.
  • the cell connector 50 may have a hollow circular or polygonal shape and is coupled to the outside of the cell formed by the combination of the first electrode holder 30 and the second electrode holder 40. Hold the cell firmly.
  • the fixing method is not particularly limited, and methods such as fastening, bonding, fitting, or screwing may be used.
  • the thread 34 may be formed on the outer circumferential surface of the first electrode holder 30, and correspondingly, the thread 52 is also formed on the upper inner circumferential surface of the cell connector 50. Is formed, the outer peripheral surface of the first electrode holder 30 and the upper inner peripheral surface 52 of the cell connector 50 may be coupled in a screwed manner.
  • the cell connector 50 may have a catching portion 51 protruding to an inner surface at a lower side thereof.
  • the inner diameter of the engaging portion 51 may be formed larger than the lower outer diameter of the second electrode holder 40, it may be formed smaller than the upper outer diameter.
  • the engaging portion 51 is the second The lower side of the electrode holder 40 may pass, but may not pass through the upper side of the second electrode holder 40, so that the cell connector 50 may be accurately coupled to the cell at a predetermined position. do.
  • both surfaces of the ion exchange membrane 60 may be connected to the first electrode 10. And the second electrode 20 is pressed.
  • the distance between the first contact part 13 and the second contact part 23 located inside the cell may be kept constant. Accordingly, the thickness of the ion exchange membrane 60 positioned between the first contact portion 13 and the second contact portion 23 may also be kept constant regardless of its type.
  • the pressing on the ion exchange membrane 60 may be easily released.
  • the first electrical input unit 11 and the second electrical input unit 21 protrude out of the cell formed by combining the first electrode holder 30 and the second electrode holder 40. It can be characterized by that. As such, when the first electric input unit 11 and the second electric input unit 21 protrude out of the cell, electricity can be easily supplied when measuring the ion conductivity of the ion exchange membrane.
  • the first electrode holder 30, the second electrode holder 40 and the cell connector 50 may be made of an insulating material.
  • the first electrode holder 30, the second electrode holder 40, and the cell connector 50 are made of an insulating material, electrical insulation of the outer surface of the cell other than the electrode can be maintained, thereby improving the reliability of the ion conductivity measurement value.
  • the insulating material is not particularly limited, and according to an exemplary embodiment of the present invention, polytetrafluoroethylene (PTFE, Teflon), Polyether ether ketone (PEEK), and Polyvinyl chloride (PVC) may be used as the insulating material.
  • a method of measuring the ion conductivity of an ion exchange membrane using the cell for measuring the ion conductivity of the ion exchange membrane according to the present invention is provided.
  • the first electrode holder 30 and the second electrode holder 40 are coupled so that the ion exchange membrane 60 to be measured is positioned between the first electrode 10 and the second electrode 20.
  • the ion exchange membrane 60 is located inside the cell and completely blocked from the outside.
  • the ion exchange membrane 60 to be measured When the ion exchange membrane 60 to be measured is exposed to the outside, it may be exposed to external contaminants, and the water content of the ion exchange membrane 60 cannot be kept constant, so that the reliability of the ion conductivity measurement value cannot be improved. There is a problem.
  • the ion exchange membrane 60 to be measured when using the cell for measuring the ion conductivity of the ion exchange membrane according to the present invention, since the ion exchange membrane 60 to be measured is located inside the cell and completely blocked from the outside, access to contaminants can be blocked at the source. Since the water content of the ion exchange membrane 60 can be kept constant, there is an advantage of improving the reliability of the ion conductivity measurement value.
  • the cell connector 50 is combined with the formed cell to compress the ion exchange membrane 60.
  • the gap between the first electrode 10 and the second electrode 20 can be kept constant.
  • the interval between the first electrode 10 and the second electrode 20 is kept constant, thereby the ion exchange membrane ( 60) also maintains a constant value. Therefore, there is an advantage that can simply measure the ion conductivity without measuring the thickness of the separate ion exchange membrane.
  • the residual solution when the residual solution is discharged from the ion exchange membrane 60 as the ion exchange membrane 60 is compressed by the coupling of the cell connector 50, the residual solution is discharged through the solution discharge passage. It has a characteristic that can be discharged stably.
  • any one of the first electrode 10 and the second electrode 20 serves as an anode, which is a positive electrode, and the other serves as a cathode, a cathode. .
  • a constant waveform is applied at a low frequency at a high frequency to the ion exchange membrane 60 through the first electrode 10 and the second electrode 20.
  • the resistance value can be measured by analyzing the impedance of the ion exchange membrane 60 at this time.
  • in the process of measuring the resistance value through the impedance analysis of the ion exchange membrane 60 may be characterized by continuously supplying a predetermined amount of the electrolyte solution through the solution movement passage (35). .
  • the durability of the ion exchange membrane 60 may be stably maintained, and thus the accuracy of the impedance analysis value may be improved.
  • the electrolyte solution is not particularly limited, and various electrolyte solutions may be used depending on the type, use, ion conductivity measurement environment, and the like of the ion exchange membrane.
  • Ion conductivity of the ion exchange membrane 60 may be calculated by the following equation (1).
  • ⁇ is ion conductivity (S / m)
  • L is the thickness of the ion exchange membrane (m)
  • R is the resistance value of the ion exchange membrane ( ⁇ )
  • A is the area of the ion exchange membrane in contact with the electrode portion (m 2) )to be.
  • the thickness L of the ion exchange membrane 60 is equal to the distance between the first electrode 10 and the second electrode 20 in a state of being compressed by the cell connector 50,
  • the area A of the ion exchange membrane 60 in contact with the electrode portion is equal to the area of the first contact portion 13 or the second contact portion 23 and is a value calculated in advance. Therefore, the ion conductivity of the ion exchange membrane 60 can be easily calculated by substituting the measured resistance value of the ion exchange membrane 60.

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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  • Molecular Biology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Fuel Cell (AREA)

Abstract

La présente invention concerne une cellule pour mesurer la conductivité ionique d'une membrane échangeuse d'ions utilisée dans une pile à combustible et similaire et un procédé de mesure de conductivité ionique au moyen de celle-ci et, plus spécifiquement, une cellule pour mesurer la conductivité ionique d'une membrane échangeuse d'ions, comprenant : une première électrode venant en contact avec une surface de la membrane échangeuse d'ions ; une deuxième électrode faisant face à la première électrode de façon à venir en contact avec l'autre surface de la membrane échangeuse d'ions ; un premier support d'électrode, qui comprend un passage de transfert de solution pénétrant à travers les parties supérieure et inférieure et reçoit la première électrode à travers un premier trou traversant formé dans celui-ci ; un deuxième support d'électrode, qui reçoit la deuxième électrode à travers un deuxième trou traversant formé dans celui-ci et forme une cellule par couplage au premier support d'électrode tandis que la membrane échangeuse d'ions est disposée entre ceux-ci ; et un connecteur de cellule, qui est couplé à l'un du premier support d'électrode et du deuxième support d'électrode couplés l'un à l'autre, de sorte que les deux surfaces de la membrane échangeuse d'ions soient pressées ou libérées de la pression par la première électrode et la deuxième électrode.
PCT/KR2017/007510 2017-05-25 2017-07-13 Cellule pour mesurer la conductivité ionique d'une membrane échangeuse d'ions et procédé de mesure de conductivité ionique au moyen de celle-ci WO2018216847A1 (fr)

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KR10-2017-0064547 2017-05-25
KR1020170064547A KR101836336B1 (ko) 2017-05-25 2017-05-25 이온교환막의 이온전도도 측정용 셀 및 이를 이용한 이온전도도의 측정방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112763547A (zh) * 2020-12-30 2021-05-07 安徽皖仪科技股份有限公司 一种基于二极电导池的电导率检测系统

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
KR102629165B1 (ko) 2021-09-29 2024-01-29 한국기술교육대학교 산학협력단 이온전도도 측정기 및 이를 이용한 이온전도도 측정방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666751A (ja) * 1992-08-18 1994-03-11 Osaka Gas Co Ltd イオン伝導率測定方法
KR200288338Y1 (ko) * 2002-06-01 2002-09-11 새한에너테크 주식회사 이온전도도 측정용 셀
JP2005276822A (ja) * 2004-02-26 2005-10-06 Nitto Denko Corp イオン伝導体
JP2006038611A (ja) * 2004-07-27 2006-02-09 Minoru Umeda 電極構造体及びイオン伝導度測定装置
KR20110076744A (ko) * 2009-12-29 2011-07-06 광주과학기술원 이온교환막의 두께와 압력 측정장치 및 이의 측정방법

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Publication number Priority date Publication date Assignee Title
JP2007023092A (ja) 2005-07-13 2007-02-01 National Institute Of Advanced Industrial & Technology イオン伝導性隔膜

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0666751A (ja) * 1992-08-18 1994-03-11 Osaka Gas Co Ltd イオン伝導率測定方法
KR200288338Y1 (ko) * 2002-06-01 2002-09-11 새한에너테크 주식회사 이온전도도 측정용 셀
JP2005276822A (ja) * 2004-02-26 2005-10-06 Nitto Denko Corp イオン伝導体
JP2006038611A (ja) * 2004-07-27 2006-02-09 Minoru Umeda 電極構造体及びイオン伝導度測定装置
KR20110076744A (ko) * 2009-12-29 2011-07-06 광주과학기술원 이온교환막의 두께와 압력 측정장치 및 이의 측정방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112763547A (zh) * 2020-12-30 2021-05-07 安徽皖仪科技股份有限公司 一种基于二极电导池的电导率检测系统

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