KR102175008B1 - Method for manufacturing ionomer coated carbon structure and ionomer coated carbon structure manufactrued by the same - Google Patents

Abstract

The present invention relates to a method of manufacturing a carbon structure coated with an ionomer, a carbon structure coated with an ionomer, a carbon structure coated with the ionomer, a carbon structure assembly coated with an ionomer, and the film-ionomer A fuel cell comprising a coated carbon structure assembly, wherein the method of manufacturing a carbon structure coated with an ionomer comprises the steps of preparing a mixture by mixing a carbon structure and an ionomer, and low-frequency acoustic energy in the mixture. ) And resonant vibratory mixing to coat the ionomer on the surface of the carbon structure, and coating the mixture to prepare a carbon structure coated with the ionomer.
The method of manufacturing the carbon structure coated with the ionomer is to increase the dispersibility of the carbon structure by coating the ionomer on the surface of the carbon structure in a nano-thickness, thereby facilitating mixing, increasing dispersion stability, and increasing the dispersion stability. By uniformly distributing, it is possible to improve various performances by increasing the utilization rate of the carbon structure and the ionomer, and increase the durability by increasing the coupling efficiency between the carbon structure and the ionomer.

Description

A method of manufacturing a carbon structure coated with an ionomer, and a carbon structure coated with an ionomer produced thereby {METHOD FOR MANUFACTURING IONOMER COATED CARBON STRUCTURE AND IONOMER COATED CARBON STRUCTURE MANUFACTRUED BY THE SAME}

The present invention relates to a method of manufacturing a carbon structure coated with an ionomer, and a carbon structure coated with an ionomer prepared thereby, by coating an ionomer with a nano-thickness on the surface of the carbon structure, thereby increasing the dispersibility of the carbon structure. It facilitates mixing, increases dispersion stability, and uniformly distributes the ionomer on the surface of the carbon structure, thereby improving various performances by increasing the utilization rate of the carbon structure and the ionomer, and increasing the coupling efficiency between the carbon structure and the ionomer, making it durable. It relates to a method of manufacturing a carbon structure coated with an ionomer capable of increasing the, and a carbon structure coated with an ionomer prepared thereby.

Carbon structures such as carbon nanotubes (CNTs) or graphene have excellent electrical, thermal, optical and mechanical properties, and are used as catalyst carriers, electrode materials, etc. in the field of electrochemical devices such as fuel cells, secondary cells or capacitors. It is expected to be applied to.

However, since the carbon structure has low dispersibility, it is not easy to mix it with other materials, and there is a problem that a sufficient effect cannot be obtained by itself, and its surface coating is not easy.

It is an object of the present invention to coat the surface of a carbon structure with an ionomer in a nano-thickness, thereby increasing the dispersibility of the carbon structure to facilitate mixing, to increase dispersion stability, and to uniformly distribute the ionomer on the surface of the carbon structure. , To provide a method of manufacturing a carbon structure coated with an ionomer capable of improving various performances by increasing the utilization rate of the carbon structure and the ionomer, and increasing the coupling efficiency between the carbon structure and the ionomer, thereby increasing durability.

Another object of the present invention is to provide a carbon structure coated with an ionomer prepared by the method for producing a carbon structure coated with the ionomer.

According to an embodiment of the present invention, preparing a mixture including a carbon structure and an ionomer, applying low-frequency acoustic energy to the mixture to resonant vibratory mixing, It provides a method of manufacturing a carbon structure coated with an ionomer comprising the step of coating the ionomer on the surface of the carbon structure.

The carbon structure is a carbon nano tube, a carbon nano wire, a graphene, a graphene oxide, a carbon black, a nanostructured carbon. , Porous carbon, and a mixture thereof may be any one selected from the group consisting of.

The low-frequency acoustic energy may have a frequency of 10 to 100 Hz.

The resonance mixing may be performed by applying an acceleration of 10 to 100 G to the mixture of the carbon structure and the ionomer.

The resonance mixing may be performed for 30 seconds to 30 minutes.

The mixture may further include a solvent.

According to another embodiment of the present invention, there is provided a carbon structure coated with an ionomer comprising a carbon structure and an ionomer, wherein the ionomer is coated with a thickness of 5 nm or less on the surface of the carbon structure. .

The carbon structure is a carbon nano tube, a carbon nano wire, a graphene, a graphene oxide, a carbon black, a nanostructured carbon. , Porous carbon, and a mixture thereof may be selected from the group consisting of.

The ionomer may be coated on the surface of the carbon structure by applying low-frequency acoustic energy to the carbon structure and the mixture including the ionomer for resonant vibratory mixing.

The ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure may be 60% by weight to 100% by weight based on the total weight of the ionomer.

The ionomer aggregated without being coated on the surface of the carbon structure may be 0% to 40% by weight based on the total weight of the ionomer.

The weight ratio (I/C ratio) of the ionomer to the carbon structure represented by Equation 1 below may be 0.75 to 1.6.

[Equation 1]

I/C ratio = W _I / W _C

W _I = total weight of ionomer

W _C = total weight of the carbon structure

In the present invention, by coating the surface of the carbon structure with an ionomer in a nano-thickness, the dispersibility of the carbon structure is increased to facilitate mixing, the dispersion stability is increased, and the ionomer is uniformly distributed on the surface of the carbon structure. By increasing the utilization rate of the ionomer, various performances can be improved, and the coupling efficiency between the carbon structure and the ionomer can be increased, thereby increasing durability.

1 is a schematic diagram showing a process of coating an ionomer on the surface of a carbon structure.
2 is a transmission electron microscope (TEM) photograph of a carbon structure coated with an ionomer prepared in Example 1 of the present invention.
3 is a transmission electron microscope (TEM) photograph of a carbon structure in which the ionomer prepared in Comparative Example 1 of the present invention is mixed.

Hereinafter, an embodiment of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

The method of manufacturing a carbon structure coated with an ionomer according to an embodiment of the present invention includes preparing a mixture including a carbon structure and an ionomer, and applying low-frequency acoustic energy to the mixture to perform resonance mixing ( and coating the ionomer on the surface of the carbon structure by resonant vibratory mixing.

First, a mixture containing a carbon structure and an ionomer is prepared.

The carbon structure is a structure of various shapes made of carbon, and its kind is not particularly limited in the present invention.

The carbon structure may have a size of a micro to nano level, and is not limited to a specific size or shape.

Specific examples of the carbon structure include carbon nano tube (CNT), carbon nano wire, graphene, graphene oxide, carbon black, and nanostructure. Any one selected from the group consisting of carbon (nanostructured carbon), porous carbon (porous carbon), and mixtures thereof may be mentioned.

Meanwhile, the ionomer may be a cationic conductor having a cation exchange group such as a proton, or an anion conductor having an anion exchange group such as a hydroxy ion, carbonate, or bicarbonate.

The cation exchange group may be any one selected from the group consisting of a sulfonic acid group, a carboxyl group, a boronic acid group, a phosphoric acid group, an imide group, a sulfonimide group, a sulfonamide group, and a combination thereof, and generally may be a sulfonic acid group or a carboxyl group. have.

The cation conductor includes the cation exchange group, and a fluorine-based polymer containing fluorine in a main chain; Benzimidazole, polyamide, polyamideimide, polyimide, polyacetal, polyethylene, polypropylene, acrylic resin, polyester, polysulfone, polyether, polyetherimide, polyester, polyethersulfone, polyetherimide, poly Hydrocarbon-based polymers such as carbonate, polystyrene, polyphenylene sulfide, polyetheretherketone, polyetherketone, polyarylethersulfone, polyphosphazene or polyphenylquinoxaline; Partially fluorinated polymers such as polystyrene-graft-ethylenetetrafluoroethylene copolymer or polystyrene-graft-polytetrafluoroethylene copolymer; And sulfone imide.

More specifically, when the cationic conductor is a hydrogen ion cationic conductor, the polymers may include a cation exchange group selected from the group consisting of a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group and a derivative thereof in the side chain, and the Specific examples include poly(perfluorosulfonic acid), poly(perfluorocarboxylic acid), a copolymer of tetrafluoroethylene and fluorovinyl ether containing a sulfonic acid group, defluorinated sulfurized polyether ketone, or a mixture thereof. Fluorine-based polymer containing; Sulfonated polyimide (S-PI), sulfonated polyarylethersulfone (S-PAES), sulfonated polyetheretherketone (SPEEK), sulfonated polybenzimi Dazole (sulfonated polybenzimidazole (SPBI)), sulfonated polysulfone (S-PSU), sulfonated polystyrene (S-PS), sulfonated polyphosphazene, sulfonated poly Quinoxaline, sulfonated polyketone, sulfonated polyphenylene oxide, sulfonated polyether sulfone, sulfonated polyether ketone polyether ketone), sulfonated polyphenylene sulfone, sulfonated polyphenylene sulfide, sulfonated polyphenylene sulfide sulfone, sulfonated polyphenyl Sulfonated polyphenylene sulfide sulfone nitrile, sulfonated polyarylene ether, sulfonated polyarylene ether nitrile, sulfonated polyarylene ether nitrile ( sulfonated polyarylene ether ether nitrile), polyarylene ether sulfone ketone, and their A hydrocarbon-based polymer including a mixture may be mentioned, but the present invention is not limited thereto.

In addition, the cationic conductor may replace H with Na, K, Li, Cs or tetrabutylammonium in the cation exchange group at the side chain terminal. When H is substituted with Na in the cation exchange group at the side chain terminal, NaOH is substituted with tetrabutylammonium when preparing the carbon structure composition, and tetrabutylammonium hydroxide is used to replace K, Li or Cs. It can be substituted with an appropriate compound. Since the substitution method is widely known in the art, a detailed description thereof will be omitted herein.

The cationic conductor may be used in the form of a single substance or a mixture, and may optionally be used together with a non-conductive compound for the purpose of further improving adhesion to the ion exchange membrane. It is preferable to use the amount adjusted to suit the purpose of use.

Examples of the non-conductive compound include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), ethylene/tetrafluoro Ethylene/tetrafluoroethylene (ETFE), ethylene chlorotrifluoro-ethylene copolymer (ECTFE), polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP), Dode At least one selected from the group consisting of silbenzenesulfonic acid and sorbitol may be used.

The anion conductor is a polymer capable of transporting anions such as hydroxy ions, carbonates or bicarbonates, and the anion conductors are commercially available in the form of hydroxide or halide (generally chloride), and the anion conductors are industrial water purification (water purification), metal separation, or carbon structure process.

As the anionic conductor, a polymer doped with a metal hydroxide may be generally used, and specifically, poly(ethersulfone), polystyrene, a vinyl polymer, poly(vinyl chloride), poly(vinylidene fluoride) doped with a metal hydroxide , Poly(tetrafluoroethylene), poly(benzimidazole), poly(ethylene glycol), or the like can be used.

Commercially commercialized examples of the ionomer include Nafion and Aquibion.

The amount of the ionomer is preferably determined in consideration of the specific surface area of the carbon structure, and typically, the ionomer is 30 parts by weight to 200 parts by weight, specifically 50 parts by weight based on 100 parts by weight of the carbon structure. It may be included in to 150 parts by weight. When the content of the ionomer is less than 30 parts by weight, a portion to which the ionomer is not coated may be present in the carbon structure, and when the content of the ionomer exceeds 200 parts by weight, an agglomerated portion between ionomers may occur due to an excess of ionomer.

The mixture may specifically be prepared by adding the carbon structure to the ionomer or adding the ionomer to the carbon structure, and it is not necessary to mix the prepared mixture after the addition, but a general method prior to the resonance mixing It is also possible to mix by. At this time, the general mixing method may use any one or more dispersion methods selected from ultrasonic dispersion, stirring, 3-roll mill, ball mill, planetary stirring, high pressure dispersion, and mixing methods thereof.

The mixture may further include a solvent together with the carbon structure and the ionomer. In this case, the mixture is prepared by adding the carbon structure to the solvent to prepare a carbon structure solution, and then adding the ionomer to the carbon structure solution. It may be prepared, and after preparing an ionomer solution by adding the ionomer to the solvent, it may be prepared by adding the carbon structure to the ionomer solution, or may be prepared by mixing the carbon structure solution and the ionomer solution.

The solvent may be a solvent selected from the group consisting of water, a hydrophilic solvent, an organic solvent, and one or more mixtures thereof.

The hydrophilic solvent is one selected from the group consisting of alcohols, ketones, aldehydes, carbonates, carboxylates, carboxylic acids, ethers, and amides containing a linear, branched saturated or unsaturated hydrocarbon having 1 to 12 carbon atoms as a main chain. It may have the above functional groups, and these may include an alicyclic or aromatic cyclo compound as at least a part of the main chain. Specific examples of alcohol include methanol, ethanol, isopropyl alcohol, ethoxy ethanol, n-propyl alcohol, butyl alcohol, 1,2-propanediol, 1-pentanol, 1.5-pentanediol, 1.9-nonandiol, and the like; Heptanone, Octanone, etc. as a ketone; Examples of aldehydes include benzaldehyde and tolualdehyde; Examples of esters include methylpentanoate, ethyl-2-hydroxypropanoate, and the like; Examples of the carboxylic acid include pentanoic acid and heptanoic acid; Examples of ethers include methoxybenzene and dimethoxypropane; The amides include propanamide, butylamide, dimethylacetamide, and the like.

The organic solvent may be selected from N-methylpyrrolidone, dimethyl sulfoxide, tetrahydrofuran, and mixtures thereof.

The solvent may be contained in an amount of 80 to 95% by weight based on the total weight of the mixture, and if it is less than 80% by weight, the solid content is too high and there may be a dispersion problem due to cracks and high viscosity when applying the ionomer-coated carbon structure. In addition, when it exceeds 95% by weight, the activity of the ionomer-coated carbon structure may be disadvantageous.

Next, the mixture is resonantly mixed to coat the ionomer on the surface of the carbon structure.

The resonance mixing is a mixing process in which mixing resonates, and the resonance of mixing may occur as a result of a combination of vibration and acceleration of the mixed components. When the resonance mixing is performed, a large number of strong mixing regions having a diameter of about 50 μm are generated, thereby eliminating dead-zones, thereby enabling uniform mixing as a whole.

The resonance mixing can minimize contamination because it does not require parts necessary for stirring such as an impeller, can reduce loss, and the range of soluble viscosity is 1 cP to 1 million cP or more, and vacuum or temperature can be adjusted. .

As a commercially available device capable of resonant mixing, a Resodyn ^® Resonant Acoustic Mixer (RAM) or the like may be used.

The inventors of the present invention discovered that it was possible to coat the ionomer with a nano-thickness of 5 nm or less on the surface of the carbon structure by using the resonance mixing and completed the present invention.

1 is a schematic diagram showing a process of coating the ionomer on the surface of the carbon structure. Referring to FIG. 1, the surface of the carbon structure 1 is coated with a nano-thickness by the ionomer 3 by the resonance mixing. That is, the softer ionomer 3 may be coated on the surface of the carbon structure 1 having a harder structure by using the resonance mixing.

To this end, the resonance mixing may be performed by applying low-frequency acoustic energy. The low-frequency acoustic energy is a linear or spherical energy propagation through a tangible medium within a frequency range of 10 to 20000 Hz, and in the present invention, in order to coat the ionomer on the surface of the carbon structure with a nano-thickness, a frequency of 10 to 100 Hz, Specifically, low-frequency acoustic energy having a frequency of 50 to 70 Hz is used.

In addition, the resonance mixing may be achieved by applying an acceleration of 10 to 100 G, specifically 40 to 100 G, to the mixture of the carbon structure and the ionomer under the frequency (here, G means gravitational acceleration, for example, 10 G means 10 times the acceleration of gravity).

If the acceleration is less than 10 G, an unmixed region may exist, coating may not be performed, and if the acceleration exceeds 100 G, there may be problems such as agglomeration of ionomers or a change in mixing conditions due to phase separation and heat generation.

A method for applying the low-frequency acoustic energy and the acceleration in the frequency domain to the mixture is not particularly limited in the present invention, and any conventionally known method may be used. As an example, when using the Resodyn ^® Resonant Acoustic Mixer, the acoustic energy is supplied by a periodic linear displacement of the container filling the mixture of the carbon structure and the ionomer, and a plurality of mechanical or electronic transducer arrangements are used for this And, more specifically, oscillator drives for transferring vibration and acceleration to the container and a variable elastic member such as a spring are included. For information on the resonance sound mixer, reference may be made to US Patent Registration No. 718993 and US Patent Publication No. 2010-0294113.

The resonance mixing may be performed for 30 seconds to 30 minutes, and specifically, may be performed for a short time of 1 minute to 10 minutes. If the time of the resonance mixing is less than 30 seconds, less mixing or coating properties may not be confirmed, and if it exceeds 30 minutes, the sample or composition may be changed.

In addition, since the resonance mixing is possible to mix a wide range of materials such as solid-solid, solid-liquid, liquid-liquid, liquid-gas, etc., when the resonance mixing is used, the mixture does not contain a solvent and the carbon structure and the ionomer Solid-solid mixing including only is possible, and solid-liquid or liquid-liquid mixing is also possible in which the carbon structure, the ionomer, and both include a solvent.

The carbon structure coated with the ionomer according to another embodiment of the present invention may be manufactured by the method of manufacturing the carbon structure coated with the ionomer described above. Accordingly, the carbon structure coated with the ionomer includes a carbon structure and an ionomer, and the ionomer is coated on the surface of the carbon structure by resonance mixing by applying low-frequency acoustic energy to a mixture containing the carbon structure and the ionomer. The ionomer coating layer may have a nano thickness of 5 nm or less, specifically, a nano thickness of 0.5 to 4 nm. When the thickness of the ionomer coating layer is 5 nm or less, it is preferable in terms of utilization of the carbon structure.

In addition, when the ionomer is coated on the surface of the carbon structure by using the resonance mixing, ionomer aggregation layers having various thicknesses may be significantly reduced.

When the carbon structure and the ionomer are mixed by other conventional methods, coating is not performed or ionomer aggregation layers having various thicknesses are formed, but when the ionomer is coated on the surface of the carbon structure by using the resonance mixing The ionomer layer coating the carbon structure to a thickness of 5 nm or less may be formed almost uniformly over the entire area of the carbon structure coated with the ionomer.

Most of the ionomers are used to coat the carbon structure, and the ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure may be 60% to 100% by weight based on the total weight of the ionomer, and specifically 85 It may be from weight% to 95 weight %. When the ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure is less than 60% by weight based on the total weight of the ionomer, an uncoated area may occur, and when it exceeds 100% by weight, an agglomerated portion of the ionomer may occur. have.

In addition, the ionomer aggregation layer made of ionomers aggregated without being coated on the surface of the carbon structure may be 0% to 40% by weight, and specifically 1% to 15% by weight based on the total weight of the ionomer. When the ionomer aggregation layer exceeds 40% by weight based on the total weight of the ionomer, an aggregated region of the ionomer may occur.

The ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure means that the thickness of the carbon structure coated with the ionomer is 5 nm or less when observed with an electron microscope (TEM) or a scanning transmission electron microscope (STEM), and the carbon The ionomer aggregated without being coated on the surface of the structure indicates that the thickness exceeds 5 nm when the carbon structure coated with the ionomer is observed with TEM or STEM, or the aggregated ionomer is observed with a TEM, STEM or scanning electron microscope (SEM). it means. In addition, the ionomer may include an ionomer coated on the surface of the carbon structure with a thickness of 5 nm or less and an ionomer other than the ionomer aggregated without being coated on the surface of the carbon structure in the remaining content. The content of the ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure or the content of the aggregated ionomer may be a content value measured for the entire carbon structure coated with the ionomer, and any of the carbon structure coated with the ionomer It can also be obtained by measuring the content of the ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure present on the transmission electron microscopy (TEM) image for at least 5 locations or the content of the aggregated ionomer, and then calculating their average value. have.

In addition, when the ionomer is a fluorine-based ionomer, the carbon structure coated with the ionomer is detected by the detection of fluorine (F) during analysis by an energy dispersive X-ray spectroscope (EDS) under TEM or SEM analysis conditions. The coated and uncoated areas can be identified by the distribution of the ionomer.

In addition, when the ionomer contains a sulfonic acid group as an ion exchange group, the carbon structure coated with the ionomer is sulfur (EDS) when analyzed by energy dispersive X-ray spectroscope (EDS) under TEM or SEM analysis conditions. The distribution of the ionomer can be confirmed by detection of S), and the coated and uncoated areas can be identified by the distribution of the ionomer.

As described above, since the ionomer is uniformly coated on the surface of the carbon structure, a higher amount of ionomer is required compared to other conventional methods. Specifically, the weight ratio (I/C ratio) of the ionomer to the carbon structure represented by Equation 1 below may be 0.75 to 1.6. This may be that the I/C ratio is improved by 0.05 to 0.2 compared to the mixture of the existing carbon structure and the ionomer. The mixture of the existing carbon structure and the ionomer does not include an ionomer coating layer of 5 nm or less, and may be manufactured using an existing mixing method such as a ball mill.

[Equation 1]

I/C ratio = W _I / W _C

W _I = total weight of ionomer

W _C = total weight of the carbon structure

In addition, the carbon structure coated with the ionomer exhibits a dispersion stability of 0.5 to 15 days, specifically 1 to 8 days, in a range in which layer separation does not occur visually when left after being dispersed in a solvent with various dispersing devices. I can. If the dispersion stability is less than 0.5 days, it means that the ionomer layer is not coated.

The carbon structure coated with the ionomer may be applied as a catalyst carrier or an electrode material in the field of an electrochemical device such as a fuel cell, a secondary battery, or a capacitor.

Hereinafter, specific embodiments of the present invention are presented. However, the examples described below are only intended to specifically illustrate or describe the present invention, and the present invention is not limited thereto. In addition, information not described herein can be sufficiently technically inferred by those skilled in the art, and the description thereof will be omitted.

[Preparation Example: Preparation of ionomer-coated carbon structure]

(Example 1)

1.0 g of carbon nanotubes were improved in the container, 0.2 g of ionomer powder (Nafion, manufactured by DuPont) was improved and placed in the same container.

The container containing the mixture was mounted on a Resodyn ^® Resonant Acoustic Mixer (RAM). A carbon structure coated with an ionomer was prepared by mixing for 5 minutes at an acceleration of 70 G while applying low-frequency acoustic energy having a frequency of 60 Hz to the resonance acoustic mixer.

(Example 2)

In Example 1, the ionomer-coated carbon was carried out in the same manner as in Example 1, except that low-frequency acoustic energy having a frequency of 60 Hz was applied to the resonance acoustic mixer and mixed for 10 minutes at an acceleration of 70 G. The structure was prepared.

(Example 3)

In Example 1, the ionomer-coated carbon was carried out in the same manner as in Example 1, except that low-frequency acoustic energy having a frequency of 60 Hz was applied to the resonance acoustic mixer and mixed for 5 minutes at an acceleration of 80 G. The structure was prepared.

(Example 4)

In Example 1, except that graphene was used as the carbon structure, a carbon structure coated with an ionomer was prepared in the same manner as in Example 1 above.

(Example 5)

A carbon structure coated with an ionomer was manufactured in the same manner as in Example 1, except that carbon black was used as the carbon structure in Example 1 above.

(Example 6)

1.0 g of carbon nanotubes were improved in a container, and 1.0 g of an ionomer solution (Nafion 20% solution, manufactured by DuPont) was improved and placed in the same container.

The container containing the mixture was mounted on a Resodyn ^® Resonant Acoustic Mixer (RAM). A carbon structure coated with an ionomer was prepared by mixing for 5 minutes at an acceleration of 70 G while applying low-frequency acoustic energy having a frequency of 60 Hz to the resonance acoustic mixer.

(Comparative Example 1)

1.0 g of carbon nanotubes were improved in the container, 0.2 g of ionomer powder (Nafion, manufactured by DuPont) was improved and placed in the same container.

The mixture was dispersed and stirred using a ball mill to prepare a carbon structure in which an ion conductor was mixed.

[Experimental Example 1]

(Experimental Example 1: TEM photograph observation)

Transmission Electron Microscope (TEM) photographs of the carbon structure coated with the ionomer prepared in Example 1 and the carbon structure mixed with the ionomer prepared in Comparative Example 1 are shown in FIGS. 2 and 3, respectively. .

2 and 3, in the carbon structure coated with the ionomer prepared by resonance mixing as in Example 1, a coating phenomenon of the ionomer was clearly observed on the surface of the carbon structure, and the coating thickness was 5 nm or less. Can be confirmed. Specifically, the wave pattern of the arrow portion in FIG. 2 indicates that the ionomer is coated with 5 nm or less, and it can be seen that the coating portion is spread throughout. In addition, it can be seen that the agglomeration phenomenon in which the ionomers of Comparative Example 1 made of a ball mill are piled up was not observed.

Although the preferred embodiments of the present invention have been described in detail above, the above-described embodiments are presented as a specific example of the present invention, and the present invention is not limited thereto, and the scope of the present invention will be described later. Various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in are also within the scope of the present invention.

1: carbon structure
3: ionomer

Claims (12)

Preparing a mixture including a carbon structure and an ionomer,
Coating the ionomer on the surface of the carbon structure by applying low-frequency acoustic energy having a frequency of 10 to 100 Hz to the mixture to perform resonant vibratory mixing
Method of producing a carbon structure coated with an ionomer comprising a. The method of claim 1,
The carbon structure is a carbon nano tube, a carbon nano wire, a graphene, a graphene oxide, a carbon black, a nanostructured carbon. , Porous carbon (porous carbon) and any one selected from the group consisting of a mixture thereof, the method of producing an ionomer-coated carbon structure. The method of claim 1,
The mixture is a solid-solid mixture containing only the carbon structure and the ionomer, a method of manufacturing a carbon structure coated with an ionomer. The method of claim 1,
The resonance mixing is performed by applying an acceleration of 10 to 100 G to the mixture of the carbon structure and the ionomer. The method of manufacturing an ionomer-coated carbon structure. The method of claim 1,
The resonance mixing is performed for 30 seconds to 30 minutes, the method of manufacturing an ionomer-coated carbon structure. The method of claim 1,
The method for producing an ionomer-coated carbon structure wherein the mixture further contains a solvent. It includes a carbon structure and an ionomer,
The ionomer is coated with a thickness of 5 nm or less on the surface of the carbon structure by performing resonance mixing by applying low-frequency acoustic energy having a frequency of 10 to 100 Hz to the mixture containing the carbon structure and the ionomer. Coated carbon structure. The method of claim 7,
The carbon structure is a carbon nano tube, a carbon nano wire, a graphene, a graphene oxide, a carbon black, a nanostructured carbon. , A carbon structure coated with an ionomer that is any one selected from the group consisting of porous carbon and mixtures thereof. delete The method of claim 7,
The ionomer coated with a thickness of 5 nm or less on the surface of the carbon structure is 60 to 100% by weight based on the total weight of the ionomer. The method of claim 7,
The ionomer is not coated on the surface of the carbon structure and is aggregated from 0% to 40% by weight based on the total weight of the ionomer. The method of claim 7,
The weight ratio of the ionomer to the carbon structure represented by Equation 1 (I/C ratio) is 0.75 to 1.6. The ionomer-coated carbon structure.
[Equation 1]
I/C ratio = W _I / W _C
W _I = total weight of ionomer
W _C = total weight of the carbon structure

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