KR102505751B1 - Electrode for electrolysis and preparation method thereof - Google Patents

Abstract

The present invention relates to an electrolytic electrode with improved overvoltage and a method for manufacturing the same. The electrode for electrolysis of the present invention not only exhibits low overvoltage and can greatly reduce the power consumption of the electrolysis cell, but also can be suitably used as an anode of a chlor-alkali electrolytic cell due to its excellent chlorine generation reactivity. In addition, according to the manufacturing method of the present invention, an electrode for electrolysis having the above effects can be manufactured at low cost and with a simple process.

Description

Electrode for electrolysis and its manufacturing method {ELECTRODE FOR ELECTROLYSIS AND PREPARATION METHOD THEREOF}

The present invention relates to an electrode for electrolysis with improved overvoltage and a method for manufacturing the same.

The Chlor-alkali process is a process that produces chlorine (Cl ₂ ) and caustic soda (NaOH) by electrolysis of brine, and can mass-produce two substances widely used as basic materials in the petrochemical field. It is an industrially useful process.

The chlor-alkali process is performed in a chlor-alkali membrane or diaphragm electrolytic cell having an electrolytic electrode containing an electrolytic catalyst. In the chlor-alkali process, in addition to the theoretically required voltage, an overvoltage must be applied to overcome various specific resistances in the cell. Since this reduction in overvoltage significantly reduces the energy costs associated with cell operation, it is desirable to develop methods to minimize overvoltage requirements.

As one of the methods for reducing the overvoltage requirement of an electrolytic cell, a number of methods for reducing the overvoltage of an electrode have been proposed. For example, a sol-gel process is used to prepare a catalyst layer containing titanium oxide and ruthenium oxide, ^or palladium How to use is presented.

However, this method has problems in that the manufacturing process is complicated due to an increase in electrode manufacturing cost, making it unsuitable for production of commercial electrodes, or difficult to set conditions.

An object of the present invention is to provide an electrode for electrolysis capable of reducing an overvoltage requirement of an electrolysis cell due to low overvoltage and having excellent chlorine evolution reactivity.

In addition, another object of the present invention is to provide a method for manufacturing the electrode for electrolysis.

In order to solve the above problems, the present invention, an electrically conductive substrate;

a catalyst layer formed on the substrate and including a platinum group metal oxide and titanium oxide; and

Provided is an electrode for electrolysis comprising a polydopamine coating layer formed on the surface of the catalyst layer.

Nitrogen content of the polydopamine coating layer may be 50 to 80 atomic%.

The thickness of the polydopamine coating layer may be 5 to 1000 nm.

The platinum group metal oxide may be at least one oxide selected from the group consisting of ruthenium, platinum, rhodium, iridium, osmium, and palladium.

In one embodiment of the present invention, the platinum group metal oxide may be ruthenium oxide and iridium oxide, wherein the ruthenium oxide, iridium oxide, and titanium oxide have a metal element ratio of 30 to 45:10 to 30:35 to 50, respectively. may be included in a molar ratio of

In one embodiment of the present invention, the platinum group metal oxide may be ruthenium oxide, iridium oxide, and palladium oxide, wherein the ruthenium oxide, iridium oxide, titanium oxide, and palladium oxide are respectively 20 to 35: 10 based on the metal element. to 30: 35 to 50: may be included in a molar ratio of 2 to 15.

In addition, the present invention includes preparing an electrode including an electrically conductive substrate and a catalyst layer;

Forming a polydopamine coating layer on the surface of the catalyst layer by immersing the electrode in an aqueous solution containing dopamine and self-polymerizing dopamine; and

It provides a method for manufacturing an electrode for electrolysis, including the step of heat treatment.

The aqueous solution containing dopamine may have a pH of 8 to 10.

Forming the polydopamine coating layer may be performed at 20 to 50 °C.

The heat treatment step may be performed at 300 to 700 °C.

The electrode including the electrically conductive substrate and the catalyst layer,

preparing a coating solution for preparing an electrode catalyst layer by adding a platinum group metal salt and a titanium compound to an organic solvent;

forming a catalyst layer by applying the coating solution for preparing the electrode catalyst layer on an electrically conductive substrate; and

It may be prepared by including drying and heat-treating the catalyst layer.

The platinum group metal salt is ruthenium chloride hydrate (RuCl ₃ ㆍ nH ₂ O), tetraamine platinum (II) chloride hydrate (Pt(NH ₃ ) ₄ Cl ₂ ㆍH ₂ O), rhodium chloride (RhCl ₃ ), rhodium nitrate hydrate One selected from the group consisting of (Rh(NO ₃ ) ₃ ㆍnH ₂ O), iridium chloride hydrate (IrCl ₃ ㆍnH ₂ O), palladium chloride (PdCl ₂ ) and palladium nitrate (Pd(NO ₃ ) ₂ ). may be ideal

The titanium compound may be titanium isopropoxide, titanium tetrachloride, or a combination thereof.

The electrode for electrolysis of the present invention exhibits an excellent overvoltage improvement effect due to improved bonding strength between catalytically active particles of the catalyst layer, and exhibits improved chlorine generation reactivity and durability.

In addition, according to the method for manufacturing an electrode for electrolysis of the present invention, an electrode for electrolysis having a low overvoltage can be manufactured with a low cost and a simplified process.

1 is SEM and EDS pictures of the electrode surface of Comparative Example 1.
2 is SEM and EDS pictures of the electrode surface of Example 1.
3 is a result of measuring electrode surface components of Comparative Example 1 by EDS.
4 is a result of measuring electrode surface components of Example 1 by EDS.

Terms used in this specification are only used to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise", "comprise" or "having" are intended to indicate that there is an embodied feature, step, component, or combination thereof, but one or more other features or steps; It should be understood that the presence or addition of components, or combinations thereof, is not previously excluded.

Since the present invention can have various changes and various forms, specific embodiments will be exemplified and described in detail below. However, it should be understood that this is not intended to limit the present invention to the specific disclosed form, and includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention relates to an electrically conductive substrate;

a catalyst layer formed on the substrate and including a platinum group metal oxide and titanium oxide; and

It relates to an electrode for electrolysis comprising a polydopamine coating layer formed on the surface of the catalyst layer.

The electrode for electrolysis of the present invention includes a polydopamine coating layer on the surface of the catalyst layer to increase bonding strength between particles of the catalyst layer. Therefore, the electrode for electrolysis of the present invention has the effect of reducing overvoltage, reducing power consumption during electrolysis, and increasing the reactivity of chlorine generation. In addition, in the electrode for electrolysis of the present invention, the polydopamine coating layer serves as a protective layer for the catalyst layer and exhibits improved durability.

Since the electrically conductive substrate is used in a chlorine gas generating atmosphere in a highly concentrated saline solution, it is preferable to use a material having high corrosion resistance. For example, the electrically conductive substrate may be one selected from the group consisting of titanium, tantalum, niobium, nickel, and alloys of two or more of them, and specifically may be titanium.

The shape of the electrically conductive substrate is not particularly limited, and for example, a mesh, nonwoven fabric, foam, punched perforated plate, braided metal, expanded metal, or a porous substrate having a similar shape may be used.

The surface of the electrically conductive substrate may be polished, for example, the surface may be physically polished, and may be specifically polished by sand blasting. By smoothing the surface of the electrically conductive substrate through the physical surface polishing, the mixture can be better applied to the electrically conductive substrate so that the catalyst layer can be formed more uniformly and adherently.

The electrically conductive substrate may be further etched after the surface polishing. The etching may be chemical etching using a strong base and/or a strong acid. The etching method is not particularly limited, but, for example, the electrically conductive substrate is etched at a temperature of 40 ° C to 100 ° C for 10 minutes to 120 minutes using a strong base such as alkali hydroxides such as NaOH and KOH or hydroxides of alkaline earth metals, or HCl, It can be made by a method of etching for 10 minutes to 120 minutes at a temperature of 40 ℃ to 100 ℃ using an acid such as HF, HBr, oxalic acid, etc., and both the etching using the strong base and the etching using the acid may be sequentially performed.

In the present invention, the platinum group metal oxide is a group 8 to 10 group having similar properties to platinum, including ruthenium (Ru), platinum (Pt), rhodium (Rh), iridium (Ir), osmium (Os) and palladium (Pd). It refers to an oxide of a transition metal of, and the platinum group metal has a catalytic activity and can be included in an electrode for electrolysis to reduce overvoltage and improve life characteristics.

One or more of the platinum group metal oxides may be used in combination, and the content of the platinum group metal oxide is 30 mol% or more, or 40 mol% or more, and 80 mol% or less, or 70 mol% or less in the electrode catalyst layer for electrolysis. can be If the content of the platinum group metal oxide is less than 30 mol% in the electrode catalyst layer, the catalyst content of the electrode may not be sufficient, resulting in deterioration of electrode performance. there is.

The titanium oxide may exhibit an effect of imparting adhesion between the platinum group metal oxide and the electrically conductive substrate. In order to secure the above effect, the content of titanium oxide may be included in the range of 20 mol% or more, or 30 mol% or more, and 70 mol% or less, or 60 mol% or less of the electrode catalyst layer.

Meanwhile, according to an embodiment of the present invention, the platinum group metal oxide may include ruthenium oxide such as RuO ₂ and iridium oxide such as IrO ₂ . In this case, the content of ruthenium oxide, iridium oxide, and titanium oxide in the catalyst layer may be included in a molar ratio of 30 to 45: 10 to 30: 35 to 50, respectively, based on the metal element. When the above range is satisfied, excellent electrode activity can be secured, which is preferable.

Further, according to an embodiment of the present invention, the platinum group metal oxide may include ruthenium oxide, iridium oxide, and palladium oxide such as PdO. In this case, ruthenium oxide, iridium oxide, titanium oxide, and palladium oxide in the catalyst layer may be included in a molar ratio of 20 to 35:10 to 30:35 to 50:2 to 15, respectively, based on the metal element. When the above range is satisfied, excellent electrode activity can be secured, which is preferable.

In the present invention, the catalyst loading of the catalyst layer may be 0.1 mg/cm ² to 20 mg/cm ² , specifically, 0.5 mg/cm ² to 15 mg/cm ² , or 1 mg/cm ² to 10 mg/cm 2 . cm ² . When the above range is satisfied, excellent electrode activity can be secured, which is preferable.

The polydopamine coating layer of the present invention is a coating layer obtained by applying polydopamine on the surface of the catalyst layer and heat-treating the same, and serves to increase the bonding strength between the platinum group metal oxide and titanium metal oxide particles of the catalyst layer to reduce the overvoltage of the electrode for electrolysis. In addition, the polydopamine coating layer serves as a protective layer for protecting the catalyst layer, and thus the durability of the electrolysis electrode can be further improved.

The preferred content of the polydopamine coating layer in the electrolytic electrode of the present invention can be calculated from the nitrogen content of the polydopamine coating layer. Specifically, the nitrogen content of the polydopamine coating layer may be in the range of 50 to 80 atomic%, or 55 to 70 atomic%. When the nitrogen content of the polydopamine coating layer is as low as less than 50 atomic%, a sufficient amount of polydopamine coating is not formed, so the above-mentioned effect cannot be achieved, and when the nitrogen content exceeds 80 atomic%, there may be a problem that the electrode performance is rather deteriorated. there is. Nitrogen content of the polydopamine coating layer may be measured through EDS (Energy Dispersive X-ray Spectrometer) as specified in experimental examples to be described later.

Alternatively, the content of the polydopamine coating layer may be adjusted by adjusting the thickness of the coating layer. For example, the thickness of the polydopamine coating layer may be in the range of 5 nm to 1000 nm, or in the range of 5 to 500 nm, and within the above range, an effect of reducing overvoltage and improving durability of the electrolysis electrode may be secured.

On the other hand, the present invention comprises the steps of preparing an electrode including an electrically conductive substrate and a catalyst layer;

Forming a polydopamine coating layer on the surface of the catalyst layer by immersing the electrode in an aqueous solution containing dopamine and self-polymerizing dopamine; and

It provides a method for manufacturing an electrode for electrolysis, including the step of heat treatment.

Dopamine is a catecholamine-based adhesive molecule, and is characterized by being coated on the surface of a material through self-polymerization without additional reagents in a weak base state. When a polydopamine coating layer is formed on the electrode catalyst layer for electrolysis using the self-polymerization of dopamine and heat-treated, the binding force between catalyst particles present in the catalyst layer is improved, thereby manufacturing an electrolysis electrode with significantly reduced overvoltage.

The dopamine-containing aqueous solution preferably has a dopamine concentration in the range of 1 to 10 g/L, or 2 to 5 g/L, since a sufficient amount of polydopamine can be formed in the catalyst layer.

For self-polymerization of the dopamine, the pH of the aqueous solution containing dopamine is preferably in the range of 8 to 10, or 8.5 to 9. Under the pH conditions, self-polymerization of dopamine occurs without other additives such as an oxidizing agent, and thus a polydopamine coating may be formed on the electrode catalyst layer.

The type of base used to adjust the pH of the dopamine-containing aqueous solution is not particularly limited, but for example, trizma®, NaOH, etc. may be used alone or in combination.

Forming the polydopamine coating layer may be performed by stirring an aqueous solution containing dopamine at a temperature of 20 to 50 °C, preferably 20 to 30 °C. At this time, the reaction time is not particularly limited, but may be in the range of 12 hours to 36 hours, or 18 hours to 30 hours. Since polydopamine has a property of non-specific adhesion to the substrate, it can be coated on the catalyst layer of the electrode at the same time as it is produced. At this time, the thickness of the polydopamine coating layer is preferably in the range of 5 nm to 100 nm.

After forming the polydopamine coating layer as described above, heat treatment is performed. In the heat treatment step, binding force between catalyst particles in the catalyst layer may be further improved.

The temperature of the heat treatment step may be, for example, 300 to 700 °C, or 400 to 600 °C. If the heat treatment temperature is too low, less than 300 °C, the effect of improving binding force between catalyst particles may be reduced, and if it is too high, exceeding 700 °C, defects may occur in the catalyst layer and electrode performance may be deteriorated, which is not preferable.

In addition, it is preferable to perform the heat treatment step as short as 10 minutes or less. If the heat treatment step exceeds 10 minutes, decomposition of the polydopamine coating layer may occur, and thus the above-described effects of the present invention cannot be secured. Preferably, the heat treatment step may be performed for 2 to 7 minutes.

On the other hand, the electrode including the conductive substrate and the catalyst layer,

preparing a coating solution for preparing an electrode catalyst layer by adding a platinum group metal salt and a titanium compound to an organic solvent;

forming a catalyst layer by applying the coating solution for preparing the electrode catalyst layer on an electrically conductive substrate; and

It may be prepared by including drying and heat-treating the catalyst layer.

As the organic solvent, organic polar solvents such as alcohol-based solvents, glycol ether-based solvents, ester-based solvents, and ketone-based solvents may be used, and one or more types may be used in combination. Preferably, an alcohol-based solvent, a glycol ether-based solvent, or a combination thereof may be used as the organic solvent.

The alcohol-based solvent is preferably a C1 to C6 alcohol, and specifically, one selected from the group consisting of methanol, ethanol, propanol, isopropyl alcohol, butanol, ethylene glycol, and propylene glycol may be used, but is not limited thereto.

The glycol ether-based solvent is preferably a C4 to C8 glycol ether, specifically 2-ethoxyethanol, 2-propoxyethanol, 2-isopropoxyethanol, 2-butoxyethanol, and 2-(2-methoxyethanol). At least one selected from the group consisting of ethoxyethoxy) ethanol may be used, but is not limited thereto.

The platinum group metal salt may be used in the form of a hydrate, and non-limiting examples include ruthenium chloride hydrate (RuCl ₃ ㆍ nH ₂ O), tetraamine platinum (II) chloride hydrate (Pt(NH ₃ ) ₄ Cl ₂ ㆍH ₂ O), rhodium chloride (RhCl ₃ ), rhodium nitrate hydrate (Rh(NO ₃ ) ₃ ㆍnH ₂ O), iridium chloride hydrate (IrCl ₃ ㆍnH ₂ O), palladium chloride (PdCl ₂ ) and palladium nitrate (Pd( At least one selected from the group consisting of NO ₃ ) ₂ ) is exemplified. The platinum group metal precursor is calcined by a heat treatment step and converted into a catalytically active particle, that is, a platinum group metal oxide that is catalytic for the oxidation of chlorine ions.

The titanium compound may be titanium isopropoxide, titanium tetrachloride, and a combination thereof, preferably titanium isopropoxide.

The final concentration of the coating liquid for preparing the electrode catalyst layer may be 50 to 150 g/L, or 80 to 120 g/L. When the above concentration range is satisfied, the content of the metal precursor in the coating solution is sufficient to ensure electrode performance and durability, and the coating solution can be coated on the substrate to an appropriate thickness, so process efficiency can be maximized.

Next, the coating solution for preparing the electrode is applied on the electrically conductive substrate to form a catalyst layer, and the electrode for electrolysis is manufactured by drying and heat-treating the coating solution. At this time, the metal substrate may be subjected to a cleaning treatment such as degreasing or blasting or a surface roughening treatment before forming the catalyst layer to further improve adhesion to the catalyst layer.

In addition, in order to form an electrode having an appropriate thickness, the coating liquid coating, drying, and heat treatment steps may be repeated several times.

The method of applying the coating liquid for preparing the electrode is not particularly limited, and coating methods known in the art such as spray coating, paint brushing, doctor blade, immersion-pull method, and spin coating method may be used.

The drying step is performed to remove the solvent included in the catalyst layer, and drying conditions are not particularly limited and may be appropriately adjusted according to the solvent used and the thickness of the catalyst layer. For example, the drying step may be performed at a temperature of 70 to 200 °C for 5 minutes to 15 minutes.

Next, a heat treatment step for firing the metal precursor is performed.

In the heat treatment step, the platinum group metal precursor and the rare earth metal precursor in the catalyst layer are thermally decomposed, and thus converted into a platinum group metal having catalytic activity, a compound thereof, and a rare earth metal oxide.

Heat treatment conditions may vary depending on the type of metal precursor used, but specifically, the heat treatment temperature may be 300 to 600 °C or 400 to 550 °C, and the heat treatment time may be 10 minutes to 2 hours.

If, as described above, when the electrode is manufactured by repeating the coating, drying, and heat treatment steps one or more times, the heat treatment step performed after each coating and drying step is performed as short as 5 to 15 minutes, and after the last drying step The final heat treatment step may be performed for a sufficient time of 30 minutes or more, or about 1 hour to 2 hours. In this way, when the last heat treatment step is performed for a long time, the metal precursor can be completely pyrolyzed, and the interface between each catalyst layer can be minimized to obtain an effect of improving electrode performance, which is preferable.

The thickness of the catalyst layer in the electrode for electrolysis manufactured by the above method is not particularly limited, but may be specifically in the range of 0.5 to 5 μm, or in the range of 1 to 3 μm.

The electrode for electrolysis manufactured according to the manufacturing method of the present invention described above can be applied to various industrial electrolysis cells, and can be particularly suitably used as an anode of a chlor-alkali cell.

Hereinafter, preferred embodiments are presented to aid understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It goes without saying that changes and modifications fall within the scope of the appended claims.

[Example]

Comparative Example 1

A coating solution for preparing an electrode catalyst layer was prepared by adding ruthenium chloride hydrate, iridium chloride hydrate, and titanium isopropoxide to 500 ml of an n-butanol solvent so that the molar ratio of Ru: Ir: Ti was 35:30:45.

The coating solution was applied by brush coating on a titanium substrate (thickness of 1000 μm), dried at 70° C. for 10 minutes, and heat-treated at 480° C. for 10 minutes. An electrode for electrolysis was prepared by repeating the coating solution coating, drying, and heat treatment processes to match the loading amount of the catalyst layer. SEM and EDS (Energy Dispersive X-ray Spectrometer) pictures of the surface of the electrode of Comparative Example 1 prepared are shown in FIG. 1.

Comparative Example 2

When preparing the coating solution for preparing the electrode catalyst layer, ruthenium chloride hydrate, iridium chloride hydrate, titanium isopropoxide and palladium(II) chloride were mixed in an n-butanol solvent at a molar ratio of Ru: Ir: Pd: Ti of 27:20:45:8. An electrode for electrolysis was prepared in the same manner as in Comparative Example 1, except that it was added as much as possible.

Example 1

A polydopamine coating layer was formed on the electrode for electrolysis prepared in the same manner as in Comparative Example 1 by the following method.

After dissolving 0.15 mM trizma ^® in DI water, an aqueous solution of pH 8.5 was prepared with 0.5 M NaOH solution, and then dopamine was dissolved at a concentration of 3.0 g/L. Then, the electrode for electrolysis was added and stirred for 24 hours to self-polymerize dopamine, thereby forming a polydopamine coating layer on the electrode catalyst layer.

The electrode was dried in an oven at 70° C., and finally heat-treated at 500° C. for 5 minutes to prepare an electrolysis electrode including a polydopamine coating layer having a thickness of 100 nm. SEM and EDS (Energy Dispersive X-ray Spectrometer) pictures of the surface of the electrode prepared in Example 1 are shown in FIG. 2.

Example 2

An electrolysis electrode including a polydopamine coating layer was prepared by forming a polydopamine coating layer in the same manner as in Example 1 on the electrolysis electrode prepared in the same manner as in Comparative Example 2.

Experimental Example 1: Comparison of electrode surface components

Components of the electrode surface (polydopamine coating layer) of Comparative Example 1 and Example 1 were measured through EDS, and the results are shown in Table 1 (Comparative Example 1), Table 2 (Example 1), and Figure 3 (Comparative Example 1). and Fig. 4 (Comparative Example 2).

Element Weight % Atomic % Ti 29.32 55.28 Ru 27.17 24.28 Ir 43.51 20.44 Total 100.00

Element Weight% Atomic % N 19.23 60.21 Ti 23.24 21.28 Ru 26.16 11.35 Ir 31.36 7.16

From Table 2, it can be seen that the surface of the electrode of Example 1 was coated with polydopamine, and the nitrogen content was high.

Experimental Example 2: Overvoltage improvement evaluation

Half cells were prepared using the electrodes for electrolysis (2 cm x 2 cm) of each of the above examples and comparative examples. A 305 g/L NaCl aqueous solution was used as the electrolyte, a Pt wire was used as the counter electrode, and a saturated calomel electrode (SCE) was used as the reference electrode. The counter electrode, the reference electrode, and the anode were immersed in the electrolyte, and the voltage of the anode at a current density of 4.4 kA/m ² was measured through a constant current time potentiometry.

Ru/Ir/Ti catalyst layer Comparative Example 1 Example 1 (V vs SCE) @ 4.4 kA/cm ² 1.285V 1.263V

Ru/Ir/Pd/Ti catalyst layer Comparative Example 2 Example 2 (V vs SCE) @ 4.4 kA/cm ² 1.251V 1.230V

Referring to Tables 3 and 4, it can be seen that the electrodes of Examples 1 and 2 prepared by heat treatment after forming a polydopamine coating layer on the catalyst layer are improved by about 20 to 22 mV compared to the electrodes of Comparative Examples 1 and 2, respectively. there is.

Claims (15)

an electrically conductive substrate;
a catalyst layer formed on the substrate and including a platinum group metal oxide and titanium oxide; and
Electrolysis electrode comprising a polydopamine coating layer formed on the surface of the catalyst layer. According to claim 1,
The nitrogen content of the polydopamine coating layer is 50 to 80 atomic%, an electrode for electrolysis. According to claim 1,
The thickness of the polydopamine coating layer is 5 to 1000 nm, an electrode for electrolysis. According to claim 1,
The platinum group metal oxide is one or more oxides selected from the group consisting of ruthenium, platinum, rhodium, iridium, osmium, and palladium. According to claim 1,
The platinum group metal oxide is ruthenium oxide and iridium oxide, an electrode for electrolysis. According to claim 5,
The ruthenium oxide, iridium oxide and titanium oxide are each included in a molar ratio of 30 to 45: 10 to 30: 35 to 50 based on the metal element. According to claim 1,
The platinum group metal oxide is ruthenium oxide, iridium oxide and palladium oxide, an electrode for electrolysis. According to claim 7,
The ruthenium oxide, iridium oxide, titanium oxide and palladium oxide are each included in a molar ratio of 20 to 35: 10 to 30: 35 to 50: 2 to 15 based on the metal element. an electrically conductive substrate; and a catalyst layer formed on the substrate and including a platinum group metal oxide and titanium oxide.
Forming a polydopamine coating layer on the surface of the catalyst layer by immersing the electrode in an aqueous solution containing dopamine and self-polymerizing dopamine, and
A method of manufacturing an electrode for electrolysis comprising the step of heat treatment. According to claim 9,
The pH of the aqueous solution containing dopamine is 8 to 10, a method for producing an electrode for electrolysis. According to claim 9,
Forming the polydopamine coating layer is performed at 20 to 50 ° C., a method for manufacturing an electrode for electrolysis. According to claim 9,
The heat treatment step is performed at 300 to 700 ° C., a method for manufacturing an electrode for electrolysis. According to claim 9,
The electrode including the electrically conductive substrate and the catalyst layer,
preparing a coating solution for preparing an electrode catalyst layer by adding a platinum group metal salt and a titanium compound to an organic solvent;
forming a catalyst layer by applying the coating solution for preparing the electrode catalyst layer on an electrically conductive substrate; and
Method for producing an electrode for electrolysis, which is manufactured by including the step of drying and heat-treating the catalyst layer. According to claim 13,
The platinum group metal salt is ruthenium chloride hydrate (RuCl ₃ ㆍ nH ₂ O), tetraamine platinum (II) chloride hydrate (Pt(NH ₃ ) ₄ Cl ₂ ㆍH ₂ O), rhodium chloride (RhCl ₃ ), rhodium nitrate hydrate One selected from the group consisting of (Rh(NO ₃ ) ₃ ㆍnH ₂ O), iridium chloride hydrate (IrCl ₃ ㆍnH ₂ O), palladium chloride (PdCl ₂ ) and palladium nitrate (Pd(NO ₃ ) ₂ ). The above, the manufacturing method of the electrode for electrolysis. According to claim 13,
The titanium compound is titanium isopropoxide, titanium tetrachloride, or a combination thereof, a method for manufacturing an electrode for electrolysis.

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