KR20190053109A - Method of manufacturing porous composite electrode and method of removing organic material from porous composite electrode - Google Patents

Abstract

The present invention relates to a method for manufacturing a porous complex electrode and a method for removing an organic material of a porous complex electrode which can dramatically reduce a manufacturing time. The method for manufacturing a porous complex electrode comprises the steps of: a) manufacturing ink including a carbon material and a binder; b) manufacturing a complex electrode by coating a substrate with the ink; and c) removing the binder and an organic material by irradiating a microwave to the complex electrode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a porous composite electrode, and a method for removing an organic substance from the porous composite electrode. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a method for preparing a porous composite electrode and a method for removing an organic substance from the porous composite electrode. More specifically, the present invention relates to a method for manufacturing a porous composite electrode, which selectively removes an organic binder in a composite electrode by irradiating microwaves, The present invention relates to a method for removing organic matter.

Along with the development of various next-generation electronic devices, efforts to realize miniaturization and high efficiency of energy / sensor devices are accelerated. In general, porous carbon materials are widely used as electrode materials for supercapacitors and electrochemical gas sensors. In recent years, however, studies have been actively conducted to apply low-dimensional carbon nanomaterials such as carbon nanotubes or graphene having excellent electrical, mechanical, and physical / chemical properties to energy / sensor device electrodes for the purpose of realizing ultra-small / have. As the electrode material develops, the importance of the porous material has been emphasized in order to increase the reactivity and the efficiency through the high specific surface area.

In the conventional method of manufacturing the porous material, a method of manufacturing a porous carbon material by controlling the pore distribution according to the porosity and size of the carbon material by forming pores in a space between the pores of the carbon material and the carbon material Was reported. For this pore control, the carbon material was manufactured to have porosity through various methods and the specific capacity was improved.

As described in Korean Patent Laid-Open No. 10-2009-0124209, it is disclosed that a carbon nanotube powder is made into a porous structure having a macro-size pupil and a nanoscale pore structure.

However, when a carbon material having a porous property is prepared, a binder and a solvent are additionally used in manufacturing a carbon electrode. In order to remove the carbon material, a heat treatment is required to remove the carbon material, and carbon materials are chemically modified during the heat treatment to decrease porosity and electrical conductivity There was a problem.

Korea Patent Publication No. 10-2009-0124209

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a porous composite electrode in which a binder is selectively removed by irradiating a microwave to a composite electrode made of an ink containing a porous carbon material and a binder.

It is another object of the present invention to provide a porous composite electrode manufactured by a low-temperature process using a microwave applicable to a supercapacitor electrode or an electrochemical gas sensor.

According to another aspect of the present invention, there is provided a method of manufacturing a porous composite electrode, comprising: a) preparing an ink including a carbon material and a binder; b) coating said ink on a substrate to produce a composite electrode; And c) irradiating the composite electrode with a microwave to remove the binder.

In the method of manufacturing a porous composite electrode according to an embodiment of the present invention, the microwave may be irradiated at an irradiation intensity of 600 to 1,000 W in the step c).

In the method of manufacturing a porous composite electrode according to an embodiment of the present invention, in the step c), the microwave can be irradiated for 1 to 60 minutes.

The method of manufacturing a porous composite electrode according to an embodiment of the present invention may further include removing the substrate after the step c).

The porous composite electrode according to an embodiment of the present invention may have a capacitance increase rate satisfying Equation (1).

[Formula 1]

In the above formula (1)

C ₁ is the electrostatic capacitance of the porous composite electrode from which the binder is removed by irradiating microwaves, and C ₀ is the electrostatic capacitance of the porous composite electrode before microwave irradiation.

The porous composite electrode according to an embodiment of the present invention may have a specific surface area increase rate satisfying the following expression (2).

[Formula 2]

In the formula 2,

BET ₁ is the specific surface area of the porous composite electrode from which the binder is removed by irradiation of microwave, and BET ₀ is the specific surface area of the porous composite electrode before microwave irradiation.

The carbon material according to an embodiment of the present invention may be a composite of a carbon-based compound and platinum.

In the method of removing organic materials from a porous composite electrode according to the present invention, a binder may be selectively removed by irradiating a microwave to a composite electrode made of an ink containing a carbon material and a binder.

The porous composite electrode according to the present invention has advantages of being able to selectively remove the binder without any deformation of the substrate through the selective energy absorption process of the composite electrode by irradiating the microwave in place of the heat treatment process and shortening the production time remarkably have.

In addition, the porous composite electrode according to the present invention can be processed at a low temperature or a room temperature by using microwave, and the electric conductivity, the capacitance and the specific surface area can be improved by removing the binder.

In addition, even if the binder is removed by irradiating microwave to the composite electrode, the porous composite electrode is excellent in binding between the substrate and the porous composite electrode, and is excellent in adhesion and adhesion so that the porous composite electrode can be prevented from being broken There are advantages.

FIG. 1 shows the results of specific surface area analysis according to an embodiment of the present invention.
2 is an X-ray photoelectron spectrum according to an embodiment of the present invention.
FIG. 3 is a graph showing capacitance change measured before and after microwave irradiation of the porous composite electrode according to an embodiment of the present invention.

Hereinafter, a method for preparing a porous composite electrode according to the present invention and a method for removing an organic substance from a porous composite electrode manufacturing method will be described in detail. It should be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As used herein, the " composite electrode " may be a carbon composite electrode comprising a carbonaceous material according to an embodiment.

As used herein, a "porous composite electrode" may be a porous carbon composite electrode comprising a carbonaceous material according to an embodiment.

In the case of a porous carbon electrode used in a supercapacitor or an electrochemical gas sensor, a binder, a solvent, and a surfactant are commonly used. In order to remove the binder, a heat treatment process has been used. However, There are problems in terms of chemical modification of the carbon materials or selectivity of the substrate.

In order to solve such problems, Applicant has prepared a porous composite electrode by irradiating a microwave without a high-temperature heat treatment and effectively removing a binder through a selective energy absorption process of the composite electrode without deformation of the substrate. As a result, the electrostatic capacity, the specific surface area, and the electric conductivity are remarkably improved, the electrostatic capacity is remarkably improved, the porous composite electrode is fixed without the binder to maintain the shape, and the production time is remarkably shortened, thereby completing the present invention .

In order to accomplish the above object, the present invention relates to a method for manufacturing a porous composite electrode and a method for removing organic matter from the porous composite electrode.

The present invention will be described in detail as follows.

A method for producing a porous composite electrode according to the present invention comprises the steps of: a) preparing an ink comprising a carbon material and a binder; b) coating the ink to produce a composite electrode; And c) irradiating the composite electrode with a microwave to remove the binder.

The porous composite electrode manufactured by the manufacturing method of the present invention can effectively remove the binder through deformation of the substrate through the selective energy absorption process by irradiating the microwave, thereby remarkably improving the electrostatic capacity, specific surface area and electric conductivity, .

According to an aspect of the present invention, an ink containing carbon material and a binder can be produced in step a).

According to one aspect of the present invention, the carbon material is selected from the group consisting of activated carbon powder having excellent specific surface area, activated carbon fiber, single-walled carbon nanotube, multi-walled carbon nanotube, carbon black, carbon airgel, single- , And the like. And may be any one or a mixture of two or more selected from single-walled carbon nanotubes, multi-walled carbon nanotubes, single-layer graphenes and multi-layered graphenes. When the carbon material is used in the capacitor, it may have pores of a suitable size so that the organic electrolyte ions can easily move into the inner pores of the carbon material.

According to one aspect of the present invention, the carbon material may be a composite of a carbon-based compound and platinum. When the composite of the carbon-based compound and the platinum is included as the carbon material, the capacitance, the specific surface area, and the electric conductivity can be remarkably improved while securing the porosity. The composite may be composed of 10 to 90% by weight of a carbon-based compound and 10 to 90% by weight of platinum, but is not limited thereto.

According to an embodiment of the present invention, when the composite of carbon-based compound and platinum is included as a carbon material, the porous composite electrode is excellent in sensitivity to gas, and excellent in flexibility and durability.

Furthermore, according to one aspect of the present invention, contrary to the contraction and deformation of the substrate caused by the high-temperature heat treatment, the porous composite electrode includes a composite of a carbon-based compound and platinum, and by irradiating microwaves, The binder can be effectively removed to remarkably improve the electrostatic capacity, specific surface area, and electrical conductivity, and the production time can be remarkably shortened. In addition to this, it has excellent gas sensitivity and is excellent as an electrode for a gas sensor.

According to an embodiment of the present invention, the pore size of the carbon material may include pores of 0.3 to 5 nm, preferably pore sizes of 1.2 to 2.5 nm, 30% or more. In a typical organic electrolyte solution, the actual capacity depends on the fraction of pores having a pore size of 1 nm or more. Therefore, it is difficult to realize a carbon material having a pore size of 1 nm or less. In addition, dispersibility with a binder is not easily achieved without a surfactant, and it is difficult to realize excellent characteristics of the electrode. Accordingly, by using the carbon material having the pore size, the dispersibility with the binder can be improved, the organic electrolyte ions can be easily transferred to contribute to realization of a high capacity, and the high efficiency discharge, Can be improved.

According to an embodiment of the present invention, the specific surface area of the carbon material may be 400 to 2,000 m < 2 > / g, but is not limited thereto. The carbon material having a specific surface area is preferable because it has excellent dispersibility with a binder without a surfactant, has a high filling density of the active material, increases the content of the active material per electrode volume, and improves the capacity of the electrode per volume.

Conventionally, it has been attempted to improve the electrostatic capacity by controlling the pore distribution according to the pore size and the size of the carbon material by forming pores in the space between the pores of the carbon material and the carbon material, but the control is not easy through the heat treatment or the like .

According to one aspect of the present invention, the binder is a conductive polymer selected from fluorinated polymers selected from polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), polyaniline (PANI) and polypyrrole (PPy) Acetate (PVA), and the like can be used. Specifically, it may preferably be polytetrafluoroethylene (PTFE). When the binder is used, it can be selectively removed when the microwave is irradiated.

The content of the carbon material and the binder according to an embodiment of the present invention may be 80 to 95% by weight of the carbon material and 5 to 20% by weight of the binder. Specifically, it may be 85 to 95% by weight of the carbon material and 5 to 15% by weight of the binder. When it is included in the above range, it is preferable that the binder has a high selective removal efficiency, a porous structure is maintained, and electrostatic capacity, specific surface area and electric conductivity are remarkably improved.

Since the method for producing a porous composite electrode of the present invention does not contain a surfactant, it is not necessary to undergo a further heat treatment step, so that deformation of the substrate does not occur, which is preferable because the pores are not closed.

According to an embodiment of the present invention, the composite electrode may be manufactured by coating the ink on the substrate in the step b).

According to an embodiment of the present invention, the substrate may be a porous substrate or a film, specifically, a three-dimensional metal porous substrate or a gas-permeable polymer film. Preferably a foam-like substrate. More preferably, it may be a metal foam substrate. For example, it may be selected from nickel foam, copper foam, aluminum foam and titanium foam, or the like. Preferably a nickel foam. The substrate is preferably a porous structure which is easily removed by an etching solution selected from iron chloride (FeCl ₃ ) or hydrochloric acid (HCl) or the like, and is easily permeable to liquid.

According to an embodiment of the present invention, the composite electrode may be manufactured by coating the ink on the substrate in step b). The ink may be coated on the substrate by a method selected from a coating method, a spraying method, a printing method, and the like. Specifically, the coating method may be, for example, a micro gravure coating method, A roll coating method, a curtain coating method, a comma coating method, a knife coating method, a spin coating method, and the like can be given as examples of the coating method. The printing method may be performed by any one or more coating methods selected from, for example, a relief plate, offset, gravure, intaglio, rubber plate, screen and inkjet printing.

According to one embodiment of the present invention, the composite electrode after coating in step b) may be dried. The drying may be performed at a temperature of 60 to 100 ° C for 1 to 12 hours, but is not limited thereto.

According to an embodiment of the present invention, the binder may be removed by irradiating microwave to the composite electrode in step c).

A binder, a solvent, and a surfactant used in manufacturing a porous carbon electrode used in a general supercapacitor or an electrochemical gas sensor are used. In order to remove the electrode after manufacturing the electrode, a process of heat treatment at a high temperature is used. However, when the binder or the surfactant is removed through the heat treatment as described above, the chemical state of the carbon materials is changed and the porosity and the electric conductivity are decreased.

In contrast, the present invention can produce a porous composite electrode by irradiating a microwave on a composite electrode without using a high-temperature heat treatment process and effectively removing the binder through a selective energy absorption process of the composite electrode without deformation of the substrate. Accordingly, the porous composite electrode of the present invention can remarkably improve the electrostatic capacity, specific surface area and electrical conductivity, and can dramatically shorten the fabrication time.

According to an embodiment of the present invention, the microwave may be irradiated at an irradiation intensity of 600 to 1,000 W in step c). Preferably from 800 to 1,000 W. [0035] When the microwaves are irradiated with the irradiation intensity, it is preferable to instantaneously generate heat selectively to the carbon material to prevent formation of a high-temperature atmosphere and to remove the binder without deformation of the sample.

According to an embodiment of the present invention, the microwave in step c) may be irradiated for 1 to 60 minutes. Preferably for 1 to 40 minutes. More preferably 15 to 35 minutes for improving the removal efficiency of the binder. When the microwave is irradiated at the irradiation time, only the binder can be selectively removed without affecting the deformation of the sample and the structure of the carbon material.

According to an aspect of the present invention, a method of manufacturing a porous composite electrode may further include removing the substrate after the step c). The porous composite electrode of the present invention maintains porosity without deteriorating the etching solution even after the substrate is removed as described above, and can maintain good electrical characteristics.

According to an embodiment of the present invention, the porous composite electrode may have a specific surface area increase rate (%) satisfying the following formula (2).

[Formula 2]

In the formula 2,

BET ₁ is the specific surface area of the porous composite electrode from which the binder is removed by irradiation of microwave, and BET ₀ is the specific surface area of the porous composite electrode before microwave irradiation. Preferably, the specific surface area increase rate may be 20 to 65%, more preferably 25 to 60%. The porous composite electrode according to the present invention can further improve the specific surface area of the porous body by removing the binder by irradiating the microwave.

The porous composite electrode of the present invention forms a porous structure by selectively removing the binder without causing deformation or damage to the carbon material and the substrate, thereby increasing the specific surface area and maximally expanding the interface between the electrode and the electrolyte The mass transfer of the electrolyte ions moving in association with the electrolyte molecules is facilitated, so that the efficiency of adsorption and desorption of the electrolyte ions increases, and the storage capacity of the electrode can be improved.

According to an aspect of the present invention, the porous composite electrode may have a capacitance increase rate (%) satisfying the following formula (1).

[Formula 1]

In the above formula (1)

C ₁ is the electrostatic capacitance of the porous composite electrode from which the binder is removed by irradiating microwaves, and C ₀ is the electrostatic capacitance of the porous composite electrode before microwave irradiation. Preferably, the capacitance increasing rate may be 4 to 30%, more preferably 10 to 30%.

The porous composite electrode according to the present invention can improve the ion migration rate in the porous composite electrode by selectively forming the porous structure as the binder is removed, thereby improving the charging and discharging rate of the capacitor due to its excellent reactivity.

The porous composite electrode of the present invention can be produced by irradiating a microwave to a composite electrode made of an ink containing a carbon material and a binder to remove an organic matter including a binder.

Although the carbon material has a high specific surface area, it can increase the efficiency of the electrode. However, there is a limit to increase the storage capacity of the electrode only by the carbon material having such a large specific surface area. Therefore, in order to develop a high-efficiency composite electrode, it is necessary to study a constituent material of the electrode and to study a new electrode manufacturing method which can increase the adsorption capacity by controlling the surface structure of the electrode. Accordingly, the present invention provides a composite electrode including a carbon material and a binder, and by forming a porous structure without deforming the substrate and the carbon material through microwave irradiation, excellent capacitance, specific surface area, and electric conductivity can be secured there was.

The porous composite electrode thus prepared can be applied to supercapacitors and electrochemical gas sensors according to excellent capacitance, specific surface area and electrical conductivity.

Hereinafter, a method for preparing a porous composite electrode according to the present invention and a method for removing organic materials from a porous composite electrode will be described in more detail. It should be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In addition, the unit of the additives not specifically described in the specification may be% by weight.

[Example 1]

Nickel foam (Changsha Liyuan New Material Co., Ltd., 320 g / ㎡ in area density, and 1.2 mm in thickness) was cut into a circular shape having a diameter of 1.4 cm and then etched in a 1 M HCl aqueous solution for 1 minute to remove impurities Remove. Then, it was transferred to DI water, washed three times for 30 minutes by ultrasonic treatment, and then dried in a vacuum oven at 50 ° C for 1 hour.

(GC750, grade C-750, specific surface area: 50 m 2 / g, ~ 50 m 2 / g), which is a condition for maintaining the porous structure of the nickel foam when the nickel foam is removed, (MWCNTs, CM150, Hanhwa Nanotech.): Polytetrafluoroethylene (PTFE) = 70 (2.1 g): 20 (0.6 g): 10 layers, size: 100 nm to 2 μm) 10 (0.30 g) and 32.5 g of N-methyl-2-pyrrolidone (NMP) were placed in a pre-confluence mixer and mixed at 1,700 rpm for 20 minutes. Using a ball mill mixer method using a zirconium ball For 24 hours.

The nickel foam substrate prepared in the ink thus prepared was dip-coated for 1 minute to coat the solution flatly so as not to block the pores of the nickel foam. Then, it is dried in a vacuum oven at a temperature of 90 DEG C for 6 hours. The GC750 / MWCNTs / Ni foam was prepared by repeating the same procedure 5 times. The microwave of 700 W was irradiated for 5 minutes (GC-MW5) and the nickel foam To produce a GC750 / MWCNTs porous composite electrode. Samples for electrical characterization were measured by making symmetric coin cells.

[Example 2]

The same procedure was performed as in Example 1 except that the microwave was irradiated for 10 minutes (GC-MW10).

[Example 3]

The same procedure was performed as in Example 1 except that the microwave was irradiated for 20 minutes (GC-MW20).

[Example 4]

The same procedure was performed as in Example 1 except that the microwave was irradiated for 30 minutes (GC-MW30).

[Comparative Example 1]

Except that the microwave irradiation was not performed (GC-MW0) in Example 1 above.

[Experimental Example 1]

Measurement of Specific Surface Area of Porous Composite Electrode.

The specific surface area of the microwave-irradiated porous composite electrode was calculated using the BET (Brunauer-Emmett-Teller) method and the BJH (Barret-Joyner-Halenda) method using nitrogen adsorption / desorption at liquid nitrogen temperature (-196 ° C).

As shown in FIG. 1, when the specific surface area of the composite electrode prepared in Examples 2 and 4 and Comparative Example 1 was measured, it was confirmed that the specific surface area of Examples 2 and 4 was significantly improved compared to Comparative Example 1 there was. In particular, in Example 4, 493.1 m ² / g was found to be increased by about 48% compared to the electrode containing the binder before the microwave irradiation of Comparative Example 1.

[Experimental Example 2]

Confirmation of removal of binder by X-ray photoelectron spectroscopy (XPS) measurement of porous composite electrode.

As shown in FIG. 2, the composite electrode of the present invention was irradiated with a microwave, and X-ray photoelectron spectroscopy (XPS) confirmed that the binder was removed according to the intensity of the microwave irradiation and the irradiation time. XPS spectra of the composite electrodes prepared in Examples 2, 4 and Comparative Example 1 were observed after irradiation with microwave. As shown in bc of FIG. 2, the composite electrodes of Examples 2 and 4 have a peak energy of 292 eV of the CF bond of polytetrafluoroethylene as a binder after the microwave irradiation in the X-ray photoelectron spectrum, It was confirmed that the binder was removed. In addition, it was confirmed that the composite electrode according to the microwave irradiation of the present invention did not cause deformation of the substrate. In contrast, the composite electrode of Comparative Example 1 showed that the binder was not removed due to the peak strength at the bond energy of 292 eV of the C-F bond of the polytetrafluoroethylene binder.

Also, as shown in FIG. 2 (d), it can be confirmed that the fluorine content decreases with the microwave irradiation time, and it is confirmed that the removal efficiency of the binder is more excellent in the irradiation time of 20 to 30 minutes.

[Experimental Example 3]

Measurement of Capacitance Characteristics of Porous Composite Electrode.

As shown in FIGS. 3 a to 3 c, the porous composite electrode prepared in Examples 1 and 4 and Comparative Example 1 was measured for electrostatic capacity according to a voltage scanning rate in the range of 0 to 0.8 V through cyclic voltammetry. As shown in FIG. 3, in Examples 1 and 4 of the present invention, it was confirmed that capacitance increases remarkably as the voltage scanning speed increases. More preferably, it was confirmed that when the microwave irradiation was performed as in Example 4, the electrostatic capacity was further improved. On the contrary, in the case of Comparative Example 1, it was confirmed that the capacitance has a significantly lower value even when the voltage scanning speed is increased.

3, when the porous composite electrodes of Examples and Comparative Examples were measured at a speed of 50 ㎷ / s at a potential range of 0 to 0.8 V, the capacitance of the porous composite electrode of Comparative Example 1, which was not irradiated with microwave, Was significantly improved.

As shown in FIG. 3E, the charging and discharging times of the porous composite electrodes prepared in Examples 1, 3 and 4 and Comparative Example 1 were confirmed, and the porous composite electrodes of Examples 1, 3 and 4 of the present invention The electrostatic capacity was improved as the charge / discharge time was shortened. More preferably, as the microwave irradiation time is increased, it is preferable that the microwave irradiation is performed for 20 to 30 minutes, which indicates that the microwave irradiation has a better charge / discharge rate.

Further, as shown in FIG. 3F, when the power density and electrostatic capacity of the porous composite electrode prepared in Examples 1, 3 and 4 and Comparative Example 1 were examined according to the irradiation time of the microwave, the irradiation time increased Accordingly, it was confirmed that when the microwave was irradiated for 20 to 30 minutes, it had better electrical characteristics.

Therefore, the porous composite electrode of the present invention can be applied as a supercapacitor having excellent electrical characteristics.

[Experimental Example 4]

Check gas sensor sensitivity.

As Example 5, a gas sensor including a porous composite electrode prepared using a composite of carbon nanotubes and multilayer graphene complexed with platinum in place of the carbon material was prepared. In addition, a gas sensor including a porous composite electrode manufactured by using the same material as that of the above-described Example 5 but heat-treated at 200 ° C for 1 hour without microwave irradiation was prepared as Comparative Example 2.

At this time, the porous composite electrode prepared in Example 5 and Comparative Example 2 was measured for the current-voltage characteristic before and after the exposure of the target gas and the sensing reaction at the room temperature by using the target gas as carbon monoxide.

In the case of Example 5, it was confirmed that the sensing characteristic was increased while the inclination based on the rise of the current was increased when the target gas was exposed to the target gas. Furthermore, it was confirmed that the gas sensor of Example 5 had excellent sensitivity and stability in repeated exposure of the target gas because the sensitivity of the gas sensor was not changed when the gas sensor stopped the exposure of the gas.

In contrast, in the case of Comparative Example 2, the substrate was deformed by the heat treatment to shrink the size and thickness of the electrode, thereby reducing gas permeability and reducing gas sensing ability. In addition, it was confirmed that not only the current rise was small but also the sensitivity difference was not large even when the exposure was stopped. Therefore, it was confirmed that the sensitivity of the comparative example 2 was significantly lowered.

Therefore, the porous composite electrode fabricated through the microwave irradiation according to the present invention not only has excellent gas sensitivity but also exhibits stable sensitivity in repeated gas exposure environments, so that it can be applied as a gas sensor.

As described above, in the present invention, a porous composite electrode manufacturing method and a porous composite electrode organic substance removing method have been described through specific matters and a limited embodiment. However, the present invention is provided for better understanding of the present invention, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (11)

a) preparing an ink comprising a carbon material and a binder;
b) coating said ink on a substrate to produce a composite electrode; And
c) irradiating the composite electrode with a microwave to selectively remove the binder. The method according to claim 1,
And the microwave is irradiated at an irradiation intensity of 600 to 1,000 W in the step c). The method according to claim 1,
And the microwave is irradiated for 1 to 60 minutes in the step c). The method according to claim 1,
And removing the substrate after step c). ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the porous composite electrode has a capacitance increase rate satisfying Equation (1).
[Formula 1]

In the above formula (1)
C ₁ is the electrostatic capacitance of the porous composite electrode from which the binder is removed by irradiating microwaves, and C ₀ is the electrostatic capacitance of the porous composite electrode before microwave irradiation. The method according to claim 1,
Wherein the carbon material has a specific surface area of 400 to 2,000 m < 2 > / g. The method according to claim 6,
Wherein the porous composite electrode has a specific surface area increase rate satisfying the following formula (2).
[Formula 2]

In the formula 2,
BET ₁ is the specific surface area of the porous composite electrode from which the binder is removed by irradiation of microwave, and BET ₀ is the specific surface area of the porous composite electrode before microwave irradiation. The method according to claim 1,
Wherein the content of the carbon material and the binder is 80 to 95% by weight of the carbon material and 5 to 20% by weight of the binder. The method according to claim 1,
Wherein the pore size of the carbon material is 0.3 to 5 nm. The method according to claim 1,
Wherein the carbon material is a complex of a carbon-based compound and platinum. A method for removing organic matter from a porous composite electrode, the method comprising: applying a microwave to a composite electrode made of an ink containing a carbon material and a binder to remove the binder.

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