KR102721948B1 - Highly activated oxygen evolution reaction electrode for polymer electrolyte water electrolysis - Google Patents

Abstract

The present invention relates to a polymer electrolyte water electrolysis hydrogen generation electrode and a method for manufacturing the same, and more particularly, to a method for manufacturing a water electrolysis oxygen generation electrode, comprising the steps of: applying a catalyst slurry for an oxygen generation electrode to one side of a polymer electrolyte membrane; and applying a catalyst slurry for a hydrogen generation electrode to the other side of the polymer electrolyte membrane; wherein the catalyst slurry for an oxygen generation electrode includes a perfluorinated ionomer dispersion dispersed in a glycol solvent.

Description

{HIGHLY ACTIVATED OXYGEN EVOLUTION REACTION ELECTRODE FOR POLYMER ELECTROLYTE WATER ELECTROLYSIS}

The present invention relates to an oxygen generation electrode for polymer electrolyte water electrolysis and a method for manufacturing the same.

Specifically, it is a method for manufacturing an oxygen-generating electrode for water electrolysis with high activity through a decal process, breaking away from the limited manufacturing method of spraying.

Conventionally, the commonly used polymer electrolyte water electrolysis oxygen generation electrode uses noble metals such as iridium alone without a support to prevent oxidation of carbon due to the high operating voltage.

Commonly used noble metal electrocatalysts include Iridium black (Ir black) or Iridium oxide (IrO ₂ ), but due to the small surface area of these electrocatalysts, low-concentration catalyst inks are produced and oxygen-generating electrodes are produced using a spray process. However, since the spray process requires spraying a low-concentration solution, it cannot produce oxygen-generating electrodes of sufficient capacity, and it causes unevenness in properties in mass-continuous processes, and it is difficult to produce electrodes with sufficient activity and continuous production of the same properties sufficiently stably.

Therefore, in order to solve this problem, the present invention has completed the present invention by finding that an oxygen generation electrode having mass production, uniform properties, and sufficient activity can be produced by applying a decal process.

Therefore, for this purpose, research and development is required to produce a catalyst ink suitable for a mass continuous production process by changing the properties of the ionomer binder and solvent, such as producing the iridium series electrocatalyst as a high-concentration catalyst ink, and to produce an oxygen generation electrode using the same, thereby ensuring mass continuous productivity and having superior activity and performance than before.

Republic of Korea Patent Publication No. 10-2012-0051723 (May 22, 2012)

One object of the present invention is to provide a method for manufacturing a polymer electrolyte water electrolysis oxygen generation electrode which is more advantageous for commercialization through the possibility of mass continuous production, has superior activity and improved current density compared to oxygen generation electrodes manufactured through conventional manufacturing methods.

The present invention has been made to solve the above problems, and provides a method for manufacturing a polymer electrolyte water electrolysis oxygen generation electrode, comprising the steps of: applying a catalyst slurry for an oxygen generation electrode to one side of a polymer electrolyte membrane; and applying a catalyst slurry for a hydrogen generation electrode to the other side of the polymer electrolyte membrane; wherein the catalyst slurry for an oxygen generation electrode includes a perfluorinated ionomer and iridium oxide (IrO ₂ ).

According to one aspect of the present invention, the catalyst slurry may be applied by a decal application method.

According to one aspect of the present invention, the perfluorinated ionomer dispersion may be obtained by adding a glycol compound to a perfluorinated ionomer solution and performing solvent replacement.

According to one aspect of the present invention, the solvent replacement may be performed by evaporating and replacing the solvent of the perfluorinated ionomer dispersion.

According to one aspect of the present invention, the solvent of the perfluorinated ionomer may include at least one selected from water and alcohol.

According to one aspect of the present invention, the alcohol may include at least one selected from ethanol, methanol, 1-propanol, isopropyl alcohol, butanol, isobutanol, 2-butanol, and tert-butanol, or a mixture of two or more thereof.

According to one aspect of the present invention, the boiling points of the solvent (V ₁ ) and the glycol compound (V ₂ ) of the perfluorinated ionomer dispersion may satisfy the following equation 1.

[Formula 1]

V ₂ -V ₁ ≥ 70

(V ₁ is the boiling point of the solvent of the perfluorinated ionomer dispersion, V ₂ is the boiling point of the glycol compound, and the unit for each is ℃.)

According to one aspect of the present invention, the perfluorinated ionomer may include one or more or a mixture of two or more selected from poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), and a copolymer of tetrafluoroethylene and fluorovinyl ether containing a sulfonic acid group.

According to one embodiment of the present invention, the glycol compound is selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol monobutyl ether, dipropylene glycol dibutyl ether, triethylene glycol monomethyl ether, triethylene glycol dimethyl ether, triethylene glycol monoethyl ether, triethylene glycol diethyl ether, triethylene glycol monobutyl ether, It may include one or more selected from triethylene glycol dibutyl ether, ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate and propylene glycol monomethyl ether acetate, or a mixture of two or more.

According to one aspect of the present invention, an ionomer binder dispersion for a polymer electrolyte water electrolysis oxygen generation electrode can be provided, which comprises a mixture of a perfluorinated ionomer and a glycol compound.

According to one aspect of the present invention, the perfluorocarbon ionomer may include one selected from the group consisting of poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), a copolymer of tetrafluoroethylene and fluorovinyl ether containing a sulfonic acid group, and a combination thereof.

According to one aspect of the present invention, the ionomer binder dispersion may include a solid content of 15 wt.% or more, 20 wt.% or more, or 30 wt.% or more.

According to one aspect of the present invention, a polymer electrolyte water electrolysis oxygen generation electrode including the ionomer binder dispersion can be provided.

According to one aspect of the present invention, the current density of the polymer electrolyte water electrolysis oxygen generation electrode may be 2,500 mA/cm ² or more.

The method for manufacturing an oxygen generation electrode according to one aspect of the present invention has the advantage of enabling a continuous manufacturing process by introducing a decal process instead of the conventional spray process.

In addition, the oxygen generation electrode manufactured by the method for manufacturing an oxygen generation electrode according to one aspect of the present invention is manufactured through an improved decal process and can have high current density along with excellent activity in polymer electrolyte water electrolysis compared to the existing spray process.

Figure 1 is an activity graph of Example 1 and Comparative Example 1.
Figure 2 is a current-voltage curve graph of Example 1 and Comparative Example 1.

The present invention will be described in more detail below through specific examples or embodiments including the attached drawings. However, the following specific examples or embodiments are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of this invention is only for the purpose of effectively describing particular embodiments and is not intended to be limiting of the invention.

Additionally, the singular forms used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise.

Additionally, when a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

The present invention relates to a method for manufacturing an oxygen-generating electrode for polymer electrolyte water electrolysis, and relates to a new manufacturing method in which activity and current density are significantly improved compared to a spray process, which is a conventional manufacturing method, and a continuous manufacturing process can be realized.

The inventors of the present invention recognized that improvements in the manufacturing process and method and the composition of the catalyst ink for the electrode are important solutions for improving the processability and performance of a mass continuous manufacturing process for a polymer electrolyte electrolysis oxygen generation electrode, and thus invented a new manufacturing method in which the activity and current density are significantly improved and a continuous manufacturing process can be realized by changing the composition of 3M ionomer from 3M, an ionomer binder commonly used in the past, and manufacturing it at a high concentration, thereby enabling application of a decal process that was not possible with the commonly utilized spray process.

The electrocatalyst included in the above oxygen generation electrode has a low specific surface area, making it difficult to control the viscosity of the catalyst ink, so a spray process was adopted, and therefore, there is a problem in that it contains the above-mentioned problem as it is.

One aspect of the present invention includes a step of applying a catalyst slurry for an oxygen-generation electrode having a solid content of 15 wt.% or more to one side of a polymer electrolyte membrane; and a step of applying a catalyst slurry for a hydrogen-generation electrode to the other side of the polymer electrolyte membrane; wherein the oxygen-generation-only catalyst slurry is a slurry containing a perfluorinated ionomer having a solid content concentration of 15 wt.% or more and iridium oxide (IrO ₂ ), thereby providing a method for manufacturing a polymer electrolyte water electrolysis oxygen-generation electrode.

In the catalyst slurry for the oxygen generation electrode, the oxygen generation catalyst may be a catalyst commonly used in the industry, and examples thereof include, but are not limited to, Iridium black or Iridium oxide (IrO ₂ ).

In addition, in the catalyst slurry for the hydrogen generation electrode, the catalyst for hydrogen generation may be a catalyst commonly used in the industry, and examples thereof may include platinum black or carbon, or may be Pt/C, a mixture thereof, but is not limited thereto.

In addition, a catalyst slurry for an oxygen generation electrode can be applied to the polymer electrolyte membrane, and the application method can be applied using equipment such as a doctor blade, but is not limited thereto.

In another embodiment, a catalyst slurry for oxygen evolution electrode of 15 wt.% or more is first applied to a substrate using equipment such as a doctor blade, and then dried to manufacture a dried oxygen evolution electrode, and the dried oxygen evolution electrode is then thermally bonded to one side of a polymer electrolyte membrane to manufacture the electrode. However, this is not limited thereto as long as it is a method commonly used in the industry.

Below, each configuration according to an aspect of the present invention will be examined in detail.

The above polymer electrolyte membrane is a polymer electrolyte membrane commonly used in the industry, and may be, for example, Nafion 212 from Chemours, but is not limited thereto.

In one aspect, the perfluorinated ionomer dispersion comprises a perfluorinated ionomer and a solvent.

The above perfluorocarbon ionomer may be one selected from the group consisting of poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), copolymers of tetrafluoroethylene and fluorovinyl ether containing sulfonic acid groups, and combinations thereof. Specific examples thereof include, but are not limited to, 3M ionomer from 3M Corporation.

The solvent may include at least one selected from water or alcohol. The alcohol may be one selected from the group consisting of ethanol, methanol, 1-propanol, isopropyl alcohol, butanol, isobutanol, 2-butanol, tert-butanol, and the like, and mixtures thereof, but is not necessarily limited thereto.

In one embodiment, the glycol compound includes, but is not limited to, ethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycolmonopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycolmonophenyl ether, ethylene glycol monobenzyl ether, diethylene monoglycol methyl ether, diethylenemonoglycol ethyl ether, diethyleneglycol diethyl ether, diethylene diethylene glycol monobutylenes ether, diethyleneglycoldibutyl ether, dipropyleneglycol monomethyl ether, dipropyleneglycol dimethyl ether, dipropyleneglycolmonobuty ether, dipropyleneglycol dibutyl ether, triethylene glycol monomethyl ether, triethylene glycoldimethyl ether, triethylene glycol monoethyl ether, triethylene glycol diethyl ether, triethyleneglycolmonobutyl ether, triethyleneglycol dibutyl ether, ethylene glycol It may be at least one selected from the group consisting of ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycolmonobutyl ether acetate, and propylene glycol monomethylether acetate.

According to one aspect of the present invention, the perfluorinated ionomer dispersion may be obtained by adding a glycol compound to a perfluorinated ionomer solution to perform solvent replacement.

According to one aspect of the present invention, the solvent replacement may be performed by evaporating and replacing the solvent of the perfluorinated ionomer dispersion.

In one embodiment, the evaporation may be to evaporate a solvent with a lower boiling point by utilizing the difference in boiling points of the solvents. The evaporation is not particularly limited, but an evaporator, which is a device typically used to evaporate a solvent, may be used. The temperature during evaporation should be selected to be an appropriate temperature to prevent oxidation of the ionomer and the glycol-based compound. For example, but not limited to, the evaporation may be performed at a temperature lower than the boiling points of the solvent of the perfluorinated ionomer dispersion, i.e., water or alcohol or water and alcohol, and at 85 to 105°C to prevent oxidation of the glycol-based compound.

In one aspect, the boiling points of the solvent (V ₁ ) and the glycol compound (V ₂ ) of the perfluorinated ionomer dispersion may satisfy the following equation 1.

[Formula 1]

V ₂ -V ₁ ≥ 70

(V ₁ is the boiling point of the solvent of the perfluorinated ionomer dispersion, V ₂ is the boiling point of the glycol compound, and the unit for each is ℃.)

When the difference in boiling points between the solvent of the perfluorinated ionomer dispersion and the glycol compound is 70 or more as in the above equation 1, the solvent of the perfluorinated ionomer dispersion is efficiently evaporated, and the ionomer is dispersed in the glycol compound in the form of fine particles, which can significantly improve the performance of the electrode catalyst layer, thereby achieving the effects of excellent current density, low activation loss, and resistance loss, which are even more preferred.

Another aspect of the present invention provides an ionomer binder dispersion for a polymer electrolyte electrolysis hydrogen generation electrode, which comprises a mixture of a perfluorinated ionomer and a glycol compound. The ionomer binder dispersion comprises, as a solvent, water or alcohol or a glycol compound remaining after evaporating water and alcohol from a conventional perfluorinated ionomer dispersion according to the manufacturing method of one aspect of the present invention.

In another aspect, the perfluorocarbon ionomer may be one selected from the group consisting of poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), copolymers of tetrafluoroethylene and fluorovinyl ether containing sulfonic acid groups, and combinations thereof. Specific examples thereof include, but are not limited to, 3M ionomer from 3M Corporation.

In another embodiment, the glycol compound includes, but is not limited to, ethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycolmonopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycolmonophenyl ether, ethylene glycol monobenzyl ether, diethylene monoglycol methyl ether, diethylenemonoglycol ethyl ether, diethyleneglycol diethyl ether, diethylene diethylene glycol monobutylenes ether, diethyleneglycoldibutyl ether, dipropyleneglycol monomethyl ether, dipropyleneglycol dimethyl ether, dipropyleneglycolmonobuty ether, dipropyleneglycol dibutyl ether, triethylene glycol monomethyl ether, triethylene glycoldimethyl ether, triethylene glycol monoethyl ether, triethylene glycol diethyl ether, triethyleneglycolmonobutyl ether, triethyleneglycol dibutyl ether, ethylene glycol It may be at least one selected from the group consisting of ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycolmonobutyl ether acetate, and propylene glycol monomethylether acetate.

In another aspect, the ionomer binder dispersion may have a solid content of 15 wt.% or 20 wt.% or more, or 30 wt.% or more. The ionomer binder includes a conventional solvent such as water or alcohol, or water and alcohol, which are evaporated, and a glycol-based compound as a solvent.

In another aspect, the current density of the membrane-electrode assembly for the water electrolysis oxygen generation electrode may be 2,500 mA/cm ² or more at 80° C. Specifically, the current density of the membrane-electrode assembly may be 2,500 mA/cm ² or more, preferably 2,700 mA/cm ² or more, and more preferably 2,900 mA/cm ² or more.

In addition, the water electrolysis hydrogen generation electrode manufactured by a manufacturing method as in one embodiment of the present invention can have excellent electrochemical stability even in repeated cross current cycles.

[Method of measuring physical properties]

1. Thermal analysis (TGA)

Through thermal analysis, it was confirmed that a 15 wt.% ionomer binder dispersion based on propylene glycol solvent was produced. Thermal analysis was performed using a TG209 F1 Libra (Netzsch) device, flowing nitrogen at 60 ml/min, and increasing the temperature from room temperature to 500°C at a rate of 10°C per minute, and the results are shown in Figs. 1 and 2.

2. Measurement of current-voltage curve (I-V polarization) of membrane-electrode assembly for water electrolysis

To evaluate the unit cell performance of the membrane-electrode assembly for water electrolysis, first, a catalyst slurry was prepared, a membrane-electrode assembly was fabricated, and then the unit cell was assembled to evaluate the performance.

The current-voltage curve using the unit cell for electrolysis was performed through LSV. The unit cell performance was evaluated using an evaluation station (CNL Energy Co.), and titanium paper with a gas diffusion layer compressibility of about 1% was used for the oxygen evolution electrode, and carbon paper with a gas diffusion layer compressibility of about 20% was used for the hydrogen evolution electrode. The current-voltage of the connected unit cell was measured through a potentialstat/galvanostat (SP-150, VMP3B-20), and the evaluation of the unit cell was measured at a cell voltage of 1.35 to 2.0 V at a temperature of 80℃ while supplying 15 ml/min of water to the oxygen evolution electrode side, and the results are shown in Table 3. (Unit: mA/ ^cm2 )

3. Activity

Activity was measured using the following formula 1.

[Example 1]

<Preparation of ionomer binder dispersion based on propylene glycol>

A novel ionomer dispersion was prepared using a commercially available water/alcohol-based 3M dispersion from 3M.

The commercially available 3M ionomer dispersion and propylene glycol were added to the evaporation flask. The amount of propylene glycol added was such that the completed ionomer dispersion had a concentration of 15 wt.% after evaporating all of the existing solvent, water. After that, the flask was mounted on an evaporator, RE100-Pro LCD digital rotary evaporator (Dragon Lab), and the water was evaporated at 70 rpm and 90°C. After all of the water was evaporated, the evaporation flask was separated from the evaporator, and a 15 wt.% 3M ionomer binder dispersion based on propylene glycol was prepared.

<Manufacture of catalyst slurry for oxygen generation electrode>

The catalyst slurry for the oxygen evolution electrode was prepared using Iridium(IV) oxide, ^Premion® , 99.99% (metal basis), Ir 84.5% min from Alfa Aesar, and the ionomer binder was prepared using the 15 wt.% propylene glycol-based ionomer binder dispersion prepared above. The loading amount of the Iridium catalyst was 1.0 mg-Iridium/ ^cm2 .

At this time, nitrogen gas was supplied to prevent damage to the Iridium catalyst by oxygen, and the magnetic stirrer and ultrasonic stirrer were used at 30-minute intervals, repeated 5 times each, and stirred for more than 24 hours with the magnetic stirrer to complete the catalyst slurry.

The catalyst slurry for the oxygen evolution electrode was produced in an anhydrous form for viscosity, and was prepared by mixing iridium oxide (IrO ₂ ), propylene glycol, and ionomer binder solutions. The weight ratio of the iridium oxide (IrO ₂ ), propylene glycol, and ionomer binder solutions was 1:12:2.5, and the ionomer binder solution was prepared using the propylene glycol-based 3M dispersion developed in this study.

<Manufacture of catalyst slurry for hydrogen generation electrode>

The catalyst slurry for the hydrogen evolution electrode was prepared using TTK TEC10E50E (46.7 wt.% Pt/C) from Tanaka Kikinzoku Kogyu KK, and the ionomer binder solution was prepared using Nafion D2021 (EW1100) from Chemours, a commercially available water/alcohol-based solution. The catalyst loading was 0.2 mg-platinum/cm ² .

At this time, nitrogen gas was supplied to prevent damage to the platinum catalyst by oxygen, and the magnetic stirrer and ultrasonic stirrer were used at 30-minute intervals, repeated 5 times each, and stirred for more than 24 hours with the magnetic stirrer to complete the catalyst slurry.

A catalyst slurry for a hydrogen evolution electrode was prepared by mixing TTK TEC10E50E (46.7 wt.% Pt/C), distilled water, alcohol, and ionomer binder solution. The weight ratio of the TTK TEC10E50E (46.7 wt.% Pt/C), distilled water, alcohol, and ionomer binder solution was 1:5.6:5.4:2.4, and the ionomer binder solution was prepared using Nafion D2021 (EW1100) from Chemours.

<Fabrication of membrane-electrode assembly>

When producing a membrane-electrode assembly, the catalyst coated membrane (CCM) method was used, and the oxygen generation electrode was produced by transferring the catalyst slurry for the oxygen generation electrode to a Teflon-coated polyimide transfer paper with an average thickness of 10 ㎛ using a Dr. blade, drying it, and then bonding it to the polymer electrolyte membrane, and the hydrogen generation electrode was produced by using the catalyst slurry for the hydrogen generation electrode in the same manner as the oxygen generation electrode.

The iridium oxide (IrO ₂ ) loading of the oxygen evolution electrode was 1.0 mg-Iridium/cm ² , and the catalyst loading of the hydrogen evolution electrode was 0.2 mg-Platinum/cm ² . When a glycol-based compound was the main solvent, it was dried in a vacuum oven at 110 ° C. for 12 to 16 hours. The dried electrode was cut into a square according to the active area size of the polymer electrolyte water electrolysis unit cell, and each electrode was positioned on both sides of the polymer electrolyte membrane, Nafion 212 (Chemours), using a hot press, and then the membrane-electrode assembly was manufactured by thermally pressing at 120 ° C., 5 MPa, and 20 minutes.

The activity of the oxygen generation electrode for polymer electrolyte water electrolysis was evaluated by applying 1.55 V for 30 minutes, and the increase rate was confirmed by comparing the current formed initially with the current after 30 minutes, which was expressed as the increase rate of the final value compared to the initial value (see Equation 1 above) and is shown in Table 1. (Unit: %, mA/min)

The performance evaluation results of the membrane-electrode assembly with the oxygen evolution electrode for polymer electrolyte water electrolysis are shown in Table 2. The results are expressed as current density. (Unit: mA/cm ² )

[Comparative Example 1]

The same procedure was followed as in Example 1, except that the catalyst slurry for the oxygen generation electrode was sprayed. The slurry was sprayed at the same thickness as in Example 1.

Activity (%) Example 1 31.08 Comparative Example 1 4.33

Current density (mA/cm2) Example 1 2,922 Comparative Example 1 1,930

Example 1 can be confirmed to have an activity (%) improved by more than 6 times compared to Comparative Example 1.

From the I-V graph in Table 2 or Fig. 3, it can be confirmed that Example 1 has a superior current density than Comparative Example 1 under the same voltage.

This is an effect that occurs simply by changing the manufacturing method from the spray method to the decal method, even though the same catalyst slurry was used.

In addition, the above decal method, unlike the conventional spray method, allows for a continuous manufacturing process, which has the advantage of reducing time and cost when commercializing in the future.

Although the present invention has been described with reference to specific matters, limited examples, and drawings, these have been provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and those skilled in the art will appreciate that various modifications and variations may be made from this description.

Therefore, the idea of the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the claims described below as well as the claims are included in the scope of the idea of the present invention.

Claims (14)

A step of applying a catalyst slurry for an oxygen generation electrode to one side of a polymer electrolyte membrane; and
A step of applying a catalyst slurry for a hydrogen generation electrode to the other side of a polymer electrolyte membrane;
The above-mentioned catalyst slurry for the oxygen generation electrode is manufactured in an anhydrous form in which iridium oxide (IrO ₂ ) is dispersed in a perfluorinated ionomer dispersion and a glycol compound.
The above catalyst slurry application method is a method for manufacturing a water electrolysis oxygen generation electrode, in which the catalyst slurry is applied by a decal application method.
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the current density of the water electrolysis oxygen generation electrode is 2,900 mA/cm ² or more at 80°C. delete In paragraph 1,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the above-mentioned perfluorinated ionomer dispersion is obtained by adding a glycol compound to a perfluorinated ionomer solution and performing solvent replacement. In the third paragraph,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the above solvent replacement is performed by evaporating and replacing the solvent of a perfluorinated ionomer dispersion. In paragraph 4,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the solvent of the above perfluorinated ionomer comprises at least one selected from water and alcohol. In paragraph 5,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the alcohol is at least one selected from ethanol, methanol, 1-propanol, isopropyl alcohol, butanol, isobutanol, 2-butanol, and tert-butanol, or a mixture of two or more thereof. In paragraph 4,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the boiling points of the solvent (V ₁ ) of the above-mentioned perfluorinated ionomer dispersion and the glycol compound (V ₂ ) satisfy the following equation 1.
[Formula 1]
V ₂ -V ₁ ≥ 70
(V ₁ is the boiling point of the solvent of the perfluorinated ionomer dispersion, V ₂ is the boiling point of the glycol compound, and the unit for each is ℃.) In paragraph 1,
A method for manufacturing a water electrolysis oxygen generation electrode, wherein the above-mentioned perfluorinated ionomer is at least one selected from poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), and a copolymer of tetrafluoroethylene and fluorovinyl ether containing a sulfonic acid group, or a mixture of two or more. In paragraph 1,
The above glycol compounds are ethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol monobutyl ether, dipropylene glycol dibutyl ether, triethylene glycol monomethyl ether, triethylene glycol dimethyl ether, triethylene glycol monoethyl ether, triethylene glycol diethyl ether, triethylene glycol monobutyl ether, triethylene glycol dibutyl A method for producing a water electrolysis oxygen generation electrode, wherein the electrode is at least one selected from the group consisting of ether, ethylene glycol methyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, and propylene glycol monomethyl ether acetate, or a mixture of two or more thereof. delete delete delete delete delete