KR20170075528A - Insoluble electrode for water treatment and preparation method thereof - Google Patents
Insoluble electrode for water treatment and preparation method thereof Download PDFInfo
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- KR20170075528A KR20170075528A KR1020150185299A KR20150185299A KR20170075528A KR 20170075528 A KR20170075528 A KR 20170075528A KR 1020150185299 A KR1020150185299 A KR 1020150185299A KR 20150185299 A KR20150185299 A KR 20150185299A KR 20170075528 A KR20170075528 A KR 20170075528A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4606—Treatment of water, waste water, or sewage by electrochemical methods for producing oligodynamic substances to disinfect the water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
- C25B1/265—Chlorates
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
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- C25B11/0442—
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- C25B11/0484—
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
- C02F2001/46138—Electrodes comprising a substrate and a coating
- C02F2001/46142—Catalytic coating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The present invention relates to an insoluble electrode and a manufacturing method thereof, and more particularly, to an insoluble electrode which is a core component of an electrolytic water treatment apparatus for generating sodium hypochlorite or sodium hypochlorite by electrolyzing salt water, seawater or tap water, .
Description
The present invention relates to an electrolytic insoluble electrode for water treatment for electrolyzing brine or seawater and a method for producing the same.
Hypochlorous acid and sodium hypochlorite generated by electrolysis are excellent materials for disinfecting power, organic decomposition ability, and bleaching. They are almost harmless to the human body and are widely used for the sterilization of ship ballast water, restaurants and food materials, swimming pools, medical care, animal husbandry and the like. It can also be obtained by electrolysis of brine or tap water. Since such hypochlorous acid or sodium hypochlorite can be easily obtained by electrolysis using an insoluble electrode, an electrolysis method is often used. In this case, when the electrolysis is prolonged for a long time, the life of the insoluble electrode is shortened.
In order to solve this problem, a method of improving electrode lifetime by coating a platinum or platinum group metal (Pt, Ru, Pd, Ir, Os, Rh) compound on an insoluble electrode preform is mainly used. However, in order to improve the lifespan of the insoluble electrode, it is necessary to form a coating layer uniformly through a plurality of coatings using a high-cost platinum group metal compound over a certain amount. Therefore, there arises a problem that the economical efficiency is lowered due to the use of expensive materials.
Disclosure of the Invention The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for producing an insoluble electrode using a coating material of novel composition which is relatively inexpensive and comparable to, Thereby providing an electrode.
In order to achieve the above object, the present invention provides an electrode base material, And an electrocatalyst coating layer formed on at least a part of the surface of the electrode base material, wherein the electrocatalyst coating layer comprises 10 to 70% by weight of a platinum group metal oxide; 5 to 40% by weight of indium oxide; And an additive which satisfies 100% by weight of the total weight of the insoluble electrode, preferably an insoluble electrode for water treatment.
According to a preferred embodiment of the present invention, the insoluble electrode for sterilizing ship ballast water comprises 30 to 50% by weight of iridium oxide (IrO 2 ) on the surface of the titanium base material; 20 to 40% by weight of indium oxide (In 2 O 3 ); And other additives in the form of oxides (Dopant), and a catalyst layer.
The present invention also provides a method for producing the above-mentioned insoluble electrode.
More specifically, the method comprises: (a) preparing an electrode base material; (b) sandblasting the prepared electrode base material to form roughness on the surface of the electrode base material; (c) etching the roughness-formed electrode base material; (d) forming a coating layer by coating the etched electrode base material one or more times with a coating solution containing a platinum group metal compound, an indium compound, and an additive; And (e) heat treating the electrode preform having the coating layer formed thereon.
In the present invention, by developing a new composition which is a mixture of a high-priced platinum group raw material and a low-cost indium oxide having a good current property as a coating layer component of the insoluble electrode in a certain amount, a platinum group element , Such as iridium (Ir), can be significantly reduced.
Accordingly, the insoluble electrode manufactured according to the present invention exhibits improved performance through excellent current efficiency and can contribute to the ballast water treatment industry by electrolyzing seawater through cost reduction of raw material.
1 is an electron micrograph showing a surface coating layer of the insoluble electrode prepared in Example 1 of the present invention.
2 is a scanning electron micrograph showing a cross-section of a coating layer of the insoluble electrode prepared in Example 1 of the present invention.
Hereinafter, the present invention will be described in detail.
Conventionally, in order for the insoluble electrode to exhibit the lifetime improving effect, the coating process must be repeated several times using about 60 to 85% by weight of the platinum group element as the coating layer component formed on the electrode base material, .
Accordingly, the present invention provides an electrocatalyst capable of significantly reducing the amount of platinum group element such as iridium (Ir) used as an expensive raw material while maintaining performance equivalent to that of existing insoluble electrodes (e.g., acceleration life, current efficiency, An electrolytic insoluble electrode for water treatment having a surface coating layer and a method for producing the same.
In the present invention, platinum group metal oxides, indium oxides, and other additives (oxides) are mixed as components constituting the electrocatalyst surface coating layer, and their compositions are adjusted to respective specific ranges (for example, 10 to 70: ).
Indium (In) adopted in the present invention is approximately 1/30 or less of the price of iridium (Ir), and thus the unit price of the insoluble electrode can be drastically reduced as the addition rate of indium is relatively large. In addition, since the indium oxide formed on the surface of the electrode base material has excellent current characteristics compared to the iridium oxide, when indium compound is used as the coating liquid component instead of the iridium compound, the secondary salt can be stably generated. Therefore, the use amount of the platinum group metal can be remarkably reduced and the economical efficiency can be enhanced, and the performance equivalent to or higher than that of the conventional insoluble electrode can be exhibited.
<Method for producing insoluble electrode>
Hereinafter, a method for producing an insoluble electrode according to the present invention will be described. However, the present invention is not limited to the following production methods, and the steps of each process may be modified or optionally mixed as required.
In one preferred embodiment for producing the insoluble electrode, (a) preparing an electrode base material (step S10); (b) sandblasting the prepared electrode base material to form roughness on the surface of the electrode base material (step S20); (c) etching the roughness-formed electrode base material (step S30); (d) forming a coating layer by coating the etched electrode base material one or more times with a coating solution containing a platinum group metal compound, an indium compound and an additive (step S40); And (e) heat treating the electrode preform having the coating layer formed therein (step S50).
Hereinafter, the manufacturing method will be described separately for each step.
(a) Preparation of electrode base material (hereinafter referred to as step S10)
In step S10, an electrode preform cut according to a predetermined standard is prepared.
The material that can be used as the electrode base material may be any conventional metal material known to those skilled in the art without limitation. For example, titanium (Ti) or an alloy thereof is preferably used.
Titanium (Ti) is excellent in acid resistance and chemical resistance and has a relatively high melting point (1,668 ° C), so that deterioration of the electrode base material can be minimized during the heat treatment described below. The shape of the electrode base material is not particularly limited, and may be, for example, a mesh shape, a plate shape, a punched plate shape, a wire shape, or the like, preferably a plate shape.
On the other hand, if impurities are present in the electrode base material, the reliability of the produced electrode may be lowered. Accordingly, in the present invention, the electrode base material is immersed in an organic solvent such as ethyl alcohol, isopropyl alcohol, or acetone, and is then subjected to ultrasonic cleaning or chemically cleaned using an acidic solution such as sulfuric acid, oxalic acid, hydrochloric acid, nitric acid, , Or a brush or the like.
(b) an illuminance forming step (hereinafter referred to as step S20)
In step S20, the electrode base material prepared in step S10 is sandblasted to form roughness on the surface of the electrode base material.
That is, the sand is sprayed on the surface of the electrode base material to increase the surface roughness of the electrode base material. When the surface of the electrode base material is sandblasted as described above, the surface roughness can be increased. In addition, cracks, chippings, cracks, The surface of the electrode base material, which may be in a non-uniform state due to burrs, can be uniformly arranged. Such sandblasting may be carried out once or repeatedly in accordance with the required roughness. The range (size) of the roughness formed on the surface of the electrode base material is not particularly limited. For example, the roughness Ra is preferably 1.0 to 2.5 占 퐉.
On the other hand, the size of the sand particles used for the sandblast is not particularly limited, but it is preferably from 40 to 150 mesh (or an average particle diameter of from 105 to 180 탆), and the spray angle for spraying the sand is from 30 to 40 desirable. It is also preferable that the injection amount for spraying sand is 3 to 6 kgf / cm 2 (specifically, 5.5 kgf / cm 2).
(c) etching step (hereinafter referred to as step S30)
In step S30, etching is performed to remove surface foreign substances on the rough electrode base material.
The etching method that can be used in the present invention may be any conventional physical etching method or chemical etching method known in the art. Preferably, the surface is chemically etched with a conventional acid solution known in the art to remove the organic matter on the surface and make the roughness uniform.
As the acid solution to be used, sulfuric acid, hydrochloric acid, nitric acid, and oxalic acid may be used singly or in a mixture of two or more kinds thereof. However, it is not particularly limited.
In a preferred example of the etching method of the electrode base material in the step S30, sulfuric acid is diluted by a certain amount in purified water and then heated to 60 to 90 DEG C, and the electrode base material is immersed for about 1 to 30 minutes while the heated temperature is maintained The electrode base material is etched. When the chemical etching is performed, not only the surface foreign matter of the electrode base material is cleaned but also the surface area of the electrode base material is widened to increase the surface energy. In the next step S40 (coating layer formation) The bonding force can be increased.
In order to increase the purity of the electrode base material, it is possible to further include a step of immersing the etched electrode base material in pure water, rinsing the surface with ultrasonic cleaning once or twice, and then drying. At this time, the temperature at which the cleaned electrode base material is dried may be changed according to the thickness and size of the electrode base material. For example, the temperature is preferably in the range of 60 to 250 ° C for 30 minutes to 2 hours.
(d) coating liquid preparation and coating step (hereinafter referred to as " S40 step &
On the other hand, the main factors that determine the performance and lifetime of the insoluble electrode are the chemical composition of the coating liquid and the coating process using the same.
More specifically, the anode of the electrode should have a small overvoltage for the generation of excess oxygen due to excessive oxygen generation, which can be solved by coating a platinum group metal oxide having a high oxygen overvoltage on the anode base material.
Accordingly, as a main component constituting the coating liquid of the present invention, a compound containing a common platinum group metal known in the art can be used.
Examples of usable platinum group metal compounds include, but are not limited to, platinum (Pt), iridium (Ir), ruthenium (Ru), osmium (Os), rhodium (Rh), and palladium (Ir), or a mixture of platinum and iridium, and more preferably iridium (Ir).
Since the coating solution of the present invention is a solution dissolved in water, alcohol, or the like, the platinum group metal compound and the compounds described below can be used without limitation in salt-type compounds dissolved in the solvent.
In the coating liquid of the present invention, the content of the platinum group metal compound is not particularly limited and may be in the range of 10 to 70% by weight, preferably 30 to 50% by weight, based on the total weight of the entire coating liquid.
The other component (subcomponent) of the coating liquid of the present invention is a compound containing indium (In). These indium compounds, like other coating layer components, are then converted to oxide form via coating and heat treatment processes.
Since the indium (In) is formed at a level of about 1/30 or less of the iridium (Ir) price, the more the indium content is, the lower the cost of the insoluble electrode can be remarkably reduced. In addition, the indium oxide formed on the surface of the titanium electrode base material is more excellent in the current characteristics than the iridium oxide, so that when the indium compound is used instead of the iridium compound, the secondary salt can be stably generated.
The content of the indium compound is not particularly limited and may be in the range of 5 to 40% by weight, preferably 20 to 40% by weight, based on the total weight of the entire coating liquid.
The coating liquid of the present invention includes conventional additives known in the art which can increase the adhesion with the base material and increase the efficiency.
Non-limiting examples of usable dopants include Ru, Os, Rh, Pd, Ta, Ti, Co, Ni, Or a compound containing at least one element selected from the group consisting of Nb, Bo, Sn, Mn, Zr, and Mo, Oxide. When the electrode base material is coated with the coating liquid in which the electrode base material and the platinum group metal compound and the additives are mixed, it is possible to increase the bonding force between the electrode base material and the coating layer and to improve the electric conductivity of the electrode by smooth current flow.
The content of the additive is not particularly limited, but may be, for example, a balance satisfying 100 wt% of the entire coating liquid. And preferably from 1 to 30% by weight.
As the solvent of the coating solution in the step S40, a conventional solvent known in the art may be used without limitation, and for example, water or ethyl alcohol is preferable. At this time, organic solvent such as butylene or IPA can be used as the solvent, and the dilution ratio thereof is preferably adjusted to 3 to 5 wt%. It is preferable that the indium compound is firstly dissolved in an acid solution and mixed with ethyl alcohol.
One or both sides of the electrode base material is coated using the coating liquid prepared as described above to form a coating layer.
In this case, the conventional coating method known in the art can be used without any limitations. Preferably, the brush coating method can be carried out easily without additional facilities. The coating method may be carried out once, or the coating-heat treatment process may be repeated a plurality of times, for example, 3 to 5 times, in order to match the coating layer thickness level suitable for the customer's demand level.
The thickness of the coating layer may vary depending on the size and thickness of the electrode to be formed, but it is preferably 5 to 15 탆.
(e) a heat treatment step (hereinafter referred to as " S50 step &
In step S50, the titanium electrode base material on which the coating layer is formed is heat-treated. When the electrode base material having the coating layer formed thereon is heat-treated, the coating layer is activated to increase the bonding force between the coating layer and the electrode base material.
The heat treatment conditions of the electrode base material may be determined according to the size of the base material, the thickness of the base material, the thickness of the coating layer, and the like. For example, the base material may be heat treated at 80 to 250 ° C for 5 to 20 minutes, It is preferable to perform the secondary heat treatment at 450 to 600 ° C for 30 minutes to 2 hours to increase the bonding force of the electrode base material. If the heat treatment temperature exceeds 600 ° C or the heat treatment time exceeds 3 hours, the bonding force between the coating layer and the electrode base material may be weakened.
<Insoluble Electrode>
The present invention provides an insoluble electrode prepared by the above-described method, preferably an insoluble electrode for ship ballast water sterilization.
More specifically, the insoluble electrode comprises: an electrode base material; And an electrocatalyst coating layer formed on part or all of the surface of the electrode base material, wherein the electrocatalyst coating layer comprises 10 to 70% by weight of a platinum group metal oxide; 5 to 40% by weight of indium oxide; And a residual additive (for example, oxide) that satisfies 100 wt% of the total amount.
At this time, the platinum group oxide, indium oxide, additives (e.g., tin oxide), and the like may be in a mixed state in the electrocatalytic coating layer.
According to a preferred embodiment of the present invention, the coating layer contains 30 to 50 wt% of iridium oxide, 20 to 40 wt% of indium oxide, And 10 to 30 wt% of tin oxide.
The insoluble electrode according to the present invention not only significantly reduces the amount of expensive iridium used in the prior art but also has a performance equivalent to or better than that of the conventional insoluble electrode due to the excellent current property of the indium oxide used as a substitute thereof , Current efficiency, etc.) (see Tables 1 and 2 below).
In addition, the insoluble electrode produced by the above-described production method is excellent in reliability and durability. Accordingly, when the insoluble electrode of the present invention is used for electrolysis of brine (seawater) or tap water, hypochlorous acid or sodium hypochlorite can be produced with high efficiency and low power.
The insoluble electrode according to the present invention can be applied to applications for electrolysis of salt water (sea water) or tap water, electrolytic sterilization, and the like.
Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples and comparative examples.
[Example 1]
1) A 1 mm thick titanium (Ti) electrode base material was cut into a size of 10 x 63 mm 2. These electrode base materials were immersed in ethyl alcohol, ultrasonically cleaned, and pure water was poured and cleaned using a brush. At this time, the cleaning time was 1 minute per one time, and the foreign substances not removed on the surface of the electrode base material were removed through the brush.
2) The electrode base material was firstly sandblasted with sand having a particle size of # 40 and then secondly sandblasted with sand having a particle size of # 100. By primary sandblasting, the surface of the heterogeneous electrode base material And the surface area of the electrode base material could be increased by secondary sandblasting. In each sandblast, the spray angle of the sand particles was 30 ° and the sand particle spray amount was 5.5 kgf / cm 2. The surface roughness (Ra) formed by the sand blasting was 2.4 占 퐉.
3) Sulfuric acid was diluted to 5% with pure water to prepare an etching solution and heated to 60 ° C. The surface of the electrode base material was etched by immersing the electrode base material in which the surface was roughly polished by sandblasting in the heated state for about 5 minutes in a heated etching solution. Subsequently, the etched electrode base material was immersed in pure water, followed by ultrasonic cleaning twice, and then put into an oven and dried. At this time, drying was carried out at 80 DEG C for 1 hour and dried.
4) The coating solution was prepared by mixing 50 wt% of iridium chloride (IrCl 4 xH 2 O), 35 wt% of indium oxide (In 2 O 3 ) and 15 wt% of tin oxide (SnO 2 ) in ethyl alcohol, The coating was started when the residue remained visually confirmed by UV lamp after the agitation. One side or both sides of the etched electrode base material was coated with a coating liquid prepared beforehand and then heat-treated at about 500 ° C to increase the bonding strength. At this time, the coating was performed by a brush coating method, and the coating-heat treatment process was repeated five times to adjust the thickness of the coating layer.
5) The electrode base material having the coating layer formed was subjected to a first heat treatment at 250 ° C for 10 minutes to remove water from the electrode base material. Then, the second base material was subjected to a secondary heat treatment at 550 ° C for 60 minutes to increase the bonding strength between the coating layer and the electrode base material Lt; / RTI >
1 and 2 are electron micrographs each showing a surface coating layer of the insoluble electrode prepared in Example 1 and a cross section thereof.
[Comparative Example 1]
IrO 2 , RuO 2 , and SnO 2 coating layer was prepared in the same manner as in Example 1. At this time, the weight of the material used for the coating was made the same by the weight after coating method.
[Experimental example 1] Evaluation of accelerated lifetime [
The accelerated lifetime of the electrode prepared in Example 1 and the electrode prepared in Comparative Example 1 were compared and evaluated as follows.
At this time, the electrolyte concentration was 0.5 MH 2 SO 4 , the magnification was accelerated by 10 times and 20 times, and the current density was based on 0.05 A / cm 2 .
As a result of the experiment, the electrode lifetime of the electrode of Example 1 was improved by about 3% in the case of 10 times of the acceleration life and by 27% in the case of 20 times of the acceleration life of the electrode of Comparative Example 1 (see Table 1 above).
[Experimental Example 2: Current efficiency evaluation]
The current efficiency of the electrode prepared in Example 1 and the electrode prepared in Comparative Example 1 were compared and evaluated as follows.
At this time, the electrolytic solution used was seawater (4% NaCl), and the reference temperature was a flow rate of 12 l / h at 20 ° C.
As a result, the current efficiency of the electrode of Example 1 was improved by about 2% as compared with Comparative Example 1 (see Table 2).
Claims (11)
The electrocatalyst coating layer formed on part or all of the surface of the electrode base material
/ RTI >
Wherein the electrocatalyst coating layer comprises 10 to 70% by weight of a platinum group metal oxide; 5 to 40% by weight of indium oxide; And a remaining amount of an additive that satisfies 100 wt% of the whole.
Wherein the electrode base material is titanium (Ti) or an alloy thereof.
Wherein the platinum group metal oxide is platinum (Pt), iridium (Ir), or a mixture thereof.
The additive may be selected from the group consisting of Ru, Os, Rh, Pd, Ta, Ti, Co, Nb, Sn, Wherein the oxide is an oxide containing at least one element selected from the group consisting of manganese (Mn), zirconium (Zr), and molybdenum (Mo).
Wherein the thickness of the electrocatalytic coating layer is in the range of 5 to 15 占 퐉.
(b) sandblasting the prepared electrode base material to form roughness on the surface of the electrode base material;
(c) etching the roughness-formed electrode base material;
(d) forming a coating layer by coating the etched electrode base material one or more times with a coating solution containing a platinum group metal compound, an indium compound, and an additive; And
(e) heat treating the electrode base material having the coating layer formed thereon
The method for producing an insoluble electrode according to claim 1,
In the step (b), the particle size of the sand when sandblasting is # 40 to # 150,
The spray angle for spraying the sand is 30 to 40 DEG,
Wherein the spray amount for spraying the sand is 3 to 6 kgf / cm 2.
Wherein the roughness (Ra) formed on the surface of the electrode base material in the step (b) is 1.0 to 2.5 占 퐉.
In the step (c), the electrode base material having the roughness is chemically etched with one or more kinds of acid solutions selected from the group consisting of sulfuric acid, hydrochloric acid, nitric acid, and oxalic acid to remove the organic matter on the surface, By weight.
The coating solution of step (d) may contain 10 to 70% by weight of a platinum group metal compound based on 100% by weight of the coating solution; 5 to 40% by weight of an indium compound; And a remaining amount of an additive satisfying 100% by weight of the total.
In the step (e), the coated electrode preform is subjected to a first heat treatment at 80 to 250 ° C,
Wherein the second heat treatment is performed at 450 to 600 占 폚.
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| WO2023191215A1 (en) * | 2022-03-31 | 2023-10-05 | (주)성창사 | Electrode sterilization module for home appliance |
-
2015
- 2015-12-23 KR KR1020150185299A patent/KR20170075528A/en unknown
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| CN111218699A (en) * | 2018-11-27 | 2020-06-02 | 韦思科电极株式会社 | Electrode assembly for electrolytic refining |
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| US11932559B2 (en) | 2018-12-27 | 2024-03-19 | Coway Co., Ltd. | Electrode catalyst layer composed of palladium, iridium, and tantalum, and sterile water generating module coated with electrode catalyst |
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| KR20210064729A (en) * | 2019-11-26 | 2021-06-03 | (주) 테크로스 | Ruthenium-tin based catalytic electrode for electrolysis of ballast water and preparation method thereof |
| KR20210099908A (en) * | 2020-02-05 | 2021-08-13 | 주식회사 테크로스 | Ruthenium-tin based titanium nitrate coated catalytic electrode for electrolysis of ballast water and preparation method thereof |
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