KR100839372B1 - Method of preparing catalyst for fuel cell - Google Patents

Abstract

The present invention relates to a method for producing a catalyst for a fuel cell, wherein the method for preparing a catalyst for a fuel cell includes preparing a mixture by mixing a platinum-based catalyst precursor and a solvent and irradiating an atmospheric plasma to the mixture.

In the fuel cell catalyst production method of the present invention, by using an atmospheric plasma, the target catalyst can be uniformly produced economically in a simple process, and mass production is possible.

Fuel Cells, Plasma Plasma, Atmospheric Plasma, Radio Frequency Discharge Glow Discharge Plasma, Microwave Glow Discharge Plasma, Catalytic, Reduction

Description

Method for producing catalyst for fuel cell {METHOD OF PREPARING CATALYST FOR FUEL CELL}

1 is a view schematically showing the structure of a fuel cell system including a catalyst for a fuel cell of the present invention.

2 is a photograph showing a platinum-based catalyst precursor (a) and a reduced catalyst (b) according to Example 1 of the present invention.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a catalyst for a fuel cell, and more particularly, to a method for producing a catalyst for a fuel cell capable of producing a desired catalyst economically in a simple process and capable of mass production.

[Prior art]

A fuel cell is a power generation system that directly converts the chemical reaction energy of hydrogen and oxygen contained in hydrocarbon-based materials such as methanol, ethanol and natural gas into electrical energy.

Representative examples of the fuel cell system include a polymer electrolyte fuel cell (PEMFC) and a direct oxidation fuel cell (Direct Oxidation Fuel Cell). When methanol is used as a fuel in the direct oxidation fuel cell, it is called a direct methanol fuel cell (DMFC).

The polymer electrolyte fuel cell is a clean energy source that can replace fossil energy, and has high power density and energy conversion efficiency, can be operated at room temperature, and can be miniaturized and encapsulated. It can be widely used in fields such as portable power supply and military equipment.

The polymer electrolyte fuel cell has an advantage of having a high energy density, but requires attention to handling hydrogen gas and a unit such as a fuel reformer for reforming methane, methanol, natural gas, etc. to produce hydrogen as fuel gas. There is a problem requiring equipment.

In contrast, the direct oxidation fuel cell has a lower energy density than the polymer electrolyte fuel cell, but is easy to handle in a liquid state and has a low operating temperature, and thus can be operated at room temperature. As a result, it is recognized as a system suitable as a compact and general-purpose mobile power supply. In addition, the stack configuration by stacking unit cells has the advantage that can produce a wide range of output, it is attracting attention as a new portable power source because it shows an energy density of 4-10 times compared to a small lithium battery.

In such fuel cell systems, the stack that substantially generates electricity may comprise several to several unit cells consisting of a membrane-electrode assembly (MEA) and a separator (also known as a bipolar plate). Dozens of stacked structures. The membrane-electrode assembly is called an anode electrode (also called "fuel electrode" or "oxide electrode") and a cathode electrode (also called "air electrode" or "reduction electrode") with a polymer electrolyte membrane containing hydrogen ion conductive polymer therebetween. Has a bonded structure.

The anode electrode and the cathode electrode include a catalyst layer and an electrode substrate, wherein the oxidation and reduction reaction of the reactant (fuel or oxidant) takes place, and the electrode substrate supports the catalyst layer physically while supporting the catalyst layer. To spread.

The present invention provides a method for producing a catalyst for a fuel cell that can mass-produce a catalyst used in a fuel cell in a simple process.

The present invention provides a method for producing a catalyst for a fuel cell comprising mixing a platinum-based catalyst precursor and a solvent to prepare a mixture, and irradiating the mixture with atmospheric plasma.

The platinum-based catalyst precursor is H ₂ PtCl ₆ , K ₂ (PtCl ₄ ), H ₂ Pt (OH) ₆ , Pt (NO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] Cl ₂ , [Pt (NH ₃ ) ₄ ] (HCO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] (OAc) ₂ , (NH ₄ ) ₂ PtBr ₆ , (NH ₃ ) ₂ PtCl ₆ , hydrates thereof, and mixtures thereof It is desirable to be.

The atmospheric plasma is preferably generated by a power supply having a frequency of 500 kHz to 5 GHz.

The power supply is preferably RF or microwave.

The atmospheric plasma is preferably generated by RF having a frequency of 10 to 50Mhz.

The atmospheric plasma is preferably generated by a microwave having a frequency of 1 to 5 GHz.

Hereinafter, the present invention will be described in more detail.

In general, in order to prepare a catalyst for a fuel cell, a chemical method of mixing the catalyst precursor in a solvent, reducing the reducing agent with a reducing agent, and depositing the catalyst is used.

This chemical method is a method of reducing the catalyst precursor using a reducing agent such as NaBH ₄ , hydrazine, ethylene glycol, H ₂ SO ₃ , LiAlH ₄ , the most common method. It is optimized by many variables such as reaction rate, reaction rate, and so on.

Accordingly, the present invention provides a method for producing a catalyst for a fuel cell, which can produce a catalyst reproducibly in a simple process and enables mass production.

A method of preparing a catalyst for a fuel cell according to an embodiment of the present invention includes preparing a mixture by mixing a platinum-based catalyst precursor and a solvent, and irradiating an atmospheric plasma to the mixture.

First, a platinum catalyst catalyst precursor and a solvent are mixed to prepare a mixture.

The platinum catalyst precursor may be H ₂ PtCl ₆ , K ₂ (PtCl ₄ ), H ₂ Pt (OH) ₆ , Pt (NO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] Cl ₂ , [Pt (NH ₃₎ ) ₄ ] (HCO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] (OAc) ₂ , (NH ₄ ) ₂ PtBr ₆ , (NH ₃ ) ₂ PtCl ₆ , hydrates thereof, and mixtures thereof. .

In addition, by further adding a transition metal precursor in addition to the platinum-based catalyst precursor, a platinum-transition metal alloy catalyst of two or more, preferably two to four members, of the platinum-transition metal may be prepared. In transition metal precursors capable of alloying with platinum-based catalyst precursors, transition metals include Ru, Os, Pd, Ga, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Sn, Mo, W, Rh , Ir, and a transition metal selected from the group consisting of a combination thereof can be used. In addition, the transition metal precursor may be used as any type of compound such as halogen salts, nitrates, hydrochlorides, sulfates, amines, and the halogen salts are most preferred.

In general, in the fuel cell, the same catalyst is used for the cathode electrode and the anode electrode. However, when the platinum-transition metal alloy catalyst prepared according to the present invention is used for the cathode, transition metals composed of platinum, V, Cr, It is preferable to use one selected from the group consisting of Mn, Fe, Co, Ni, Cu, and combinations thereof. In the case of using the anode electrode, Ru, Ir, W, Mo, Preference is given to using those selected from the group consisting of Rh, and combinations thereof.

The catalyst may be prepared by the catalyst itself (Black), and may be prepared in a state supported on the carrier by further adding a carrier in the mixture preparation step.

As the carrier, carbon-based materials such as graphite, denka black, ketjen black, acetylene black, carbon nanotube, carbon nanofiber, carbon nanowire, carbon nanoball, or activated carbon may be used, or alumina, silica, zirconia, Inorganic fine particles such as titania may be used, but in general, carbon-based materials may be used.

The amount of the carrier is preferably 95 to 50 parts by weight based on 100 parts by weight of the catalyst precursor in the case of a catalyst for a polymer electrolyte membrane fuel cell (PEMFC), and a direct oxidation fuel cell (Direct membrane) In the case of a fuel cell (DMFC) catalyst, it is preferably 50 to 5 parts by weight based on 100 parts by weight of the catalyst precursor.

The solvent may vary depending on the type of catalyst precursor, and alcohols may be used as the solvent, and more preferably, a binary or more mixed solvent in which water and alcohol or tetrahydrofuran (THF) are mixed may be used. The use of a mixed solvent is preferable because the platinum particles can be made smaller due to the difference in vapor pressure of the solvent. In the mixed solvent of water and alcohol or tetrahydrofuran, the alcohol evenly disperses the catalyst precursor in the solvent, thereby preventing the agglomeration of the catalyst particles and acting as a dispersant to reduce the size of the catalyst particles.

The alcohol may be selected from the group consisting of isopropyl alcohol, methanol, ethanol, n-propyl alcohol, butanol, ethylene glycol, glycerol, and combinations thereof.

At this time, the mixing ratio of the water and alcohol or tetrahydrofuran is preferably in a volume ratio of 16: 1 to 1: 16, more preferably in a volume ratio of 4: 1 to 1: 4, and 2: 1 to 1: 1 Most preferably, the volume ratio is. In addition, when the type of alcohol used is binary or more, each alcohol is preferably used by mixing in the same volume ratio, but is not necessarily limited thereto.

Subsequently, the mixture is irradiated with an atmospheric plasma to reduce a catalyst precursor dispersed in a solvent to prepare a catalyst for a fuel cell.

At this time, the atmospheric plasma is preferably generated by a power supply device having a frequency of 500kHz to 5GHz.

The power supply may be a radio frequency discharge (RF) or a microwave furnace. In the case of using RF as the power supply device, the frequency of the RF is more preferably 10 to 50 MHz. In addition, when using a microwave, it is more preferable that the frequency of a microwave is 1-5GHz. The frequency of the atmospheric plasma is preferably within the above range, it is preferable to generate a plasma having a stable and reactive high electron density, and if out of the above range, the plasma is unstable and does not cause a reaction as well as contact with the reaction solution The problem of turning off the plasma may occur, which is not preferable.

Since the atmospheric plasma reduces the catalyst precursor with high energy, the reduction reaction of the catalyst precursor is effectively generated, and in particular, the RF glow discharge plasma generated from the RF or the microwave glow discharge plasma generated from the microwave has high electron density and electrons. It has a temperature, and since a lot of species of radical state can exist, reaction efficiency can be improved and a catalyst can be manufactured stably. In addition, the atmospheric plasma of the present invention can be irradiated at atmospheric pressure, not vacuum, but since the general plasma is used only in a vacuum state, there is a difficulty in practical application to irradiate the mixture.

In addition, the irradiation step is preferably carried out under an inert gas, an example of such an inert gas is argon gas. In addition, the irradiation step may be carried out while flowing hydrogen gas with an inert gas. Since hydrogen is reducible, irradiation of atmospheric plasma to the mixture while flowing hydrogen together with an inert gas is preferable because the reduction reaction of the catalyst precursor can occur more effectively. At this time, the amount of hydrogen is preferably 0.1 to 20% by volume and more preferably 1 to 10% by volume relative to the volume of the inert gas. Outside the above range, the reduction rate of the catalyst may be reduced or the stability may be affected, and the stability of the plasma may be reduced, which is not preferable.

The catalyst can be used for at least one of an anode electrode or a cathode electrode of a fuel cell. This is because in the case of fuel cells, the anode electrode and the cathode electrode are generally not distinguished by the type of catalyst, and can be easily understood by those skilled in the art.

An electrode comprising the catalyst of the present invention comprises an electrode substrate and a catalyst layer.

The catalyst layer comprises a catalyst prepared by the process of the present invention.

The catalyst layer may further include a binder resin for improving the adhesion of the catalyst layer and the transfer of hydrogen ions.

The binder resin is used in the form of a single substance or a mixture. As the binder resin, it is preferable to use a polymer resin having hydrogen ion conductivity, and more preferably, a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, and their Any polymer resin having a cation exchange group selected from the group consisting of derivatives can be used. Preferably, a fluorine polymer, a benzimidazole polymer, a polyimide polymer, a polyetherimide polymer, a polyphenylene sulfide polymer, a polysulfone polymer, a polyether sulfone polymer, a polyether ketone polymer, a polyether One or more hydrogen ion conductive polymers selected from ether ketone polymers or polyphenylquinoxaline polymers, more preferably poly (perfluorosulfonic acid), poly (perfluorocarboxylic acid), Copolymers of tetrafluoroethylene with fluorovinyl ethers containing sulfonic acid groups, defluorinated sulfided polyether ketones, aryl ketones, poly (2,2'-m-phenylene) -5,5'-bibenzimidazole One containing at least one hydrogen ion conductive polymer selected from (poly (2,2 '-(m-phenylene) -5,5'-bibenzimidazole) or poly (2,5-benzimidazole) may be used.

The hydrogen ion conductive polymer may replace H with Na, K, Li, Cs or tetrabutylammonium in an ion exchange group at the side chain end. In case of replacing H by Na in the ion-exchange group of the side chain terminal, NaOH is substituted when preparing the catalyst composition and tetrabutylammonium hydroxide when substituted by tetrabutylammonium, and K, Li or Cs is also a suitable compound. It can be substituted using. This substitution method is possible in the art and may optionally also be used with nonconductive polymers for the purpose of further improving adhesion to the polymer electrolyte membrane. It is preferable to adjust the usage-amount so that it may be suitable for a purpose of use.

Examples of the nonconductive polymer include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoro alkylvinyl ether copolymer (PFA), and ethylene / tetrafluoro Ethylene / tetrafluoroethylene (ETFE), ethylenechlorotrifluoro-ethylene copolymer (ECTFE), polyvinylidene fluoride, copolymer of polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), dode At least one selected from the group consisting of silbenzenesulfonic acid and sorbitol is more preferred.

The electrode substrate plays a role of supporting the electrode and diffuses the fuel and the oxidant to the catalyst layer, thereby serving to easily access the fuel and the oxidant to the catalyst layer. The electrode substrate is a conductive substrate, and representative examples thereof include carbon paper, carbon cloth, carbon felt, or metal cloth (porous film or polymer fiber composed of metal cloth in a fibrous state). The metal film is formed on the surface of the cloth formed with)) may be used, but is not limited thereto.

In addition, it is preferable to use a water-repellent treatment with a fluorine-based resin as the electrode base material because it can prevent the reactant diffusion efficiency from being lowered by water generated when the fuel cell is driven. Examples of the fluorine-based resin include polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoropropylene, polyperfluoroalkyl vinyl ether, polyperfluorosulfonyl fluoride alkoxy vinyl ether, and fluorinated ethylene propylene ( Fluorinated ethylene propylene), polychlorotrifluoroethylene or copolymers thereof can be used.

In addition, a microporous layer may be further included to enhance the reactant diffusion effect in the electrode substrate. These microporous layers are generally conductive powders having a small particle diameter, such as carbon powder, carbon black, acetylene black, activated carbon, carbon fiber, fullerene, carbon nanotubes, carbon nanowires, and carbon nanohorns. -horn or carbon nano ring.

The microporous layer is prepared by coating a composition comprising a conductive powder, a binder resin and a solvent on the electrode substrate. The binder resin may be polytetrafluoroethylene, polyvinylidene fluoride, polyhexafluoropropylene, polyperfluoroalkyl vinyl ether, polyperfluorosulfonyl fluoride, alkoxy vinyl ether, polyvinyl alcohol, cellulose Acetate or copolymers thereof and the like can be preferably used. As the solvent, alcohols such as ethanol, isopropyl alcohol, n-propyl alcohol, butyl alcohol, water, dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone, tetrahydrofuran, etc. may be preferably used. The coating process may be screen printing, spray coating, or coating using a doctor blade according to the viscosity of the composition, but is not limited thereto.

The membrane-electrode assembly for a fuel cell including an electrode having such a configuration as a cathode electrode and an anode electrode has a configuration in which the cathode electrode and the anode electrode are positioned to face each other, and a polymer electrolyte membrane is positioned between the cathode electrode and the anode electrode.

The polymer electrolyte membrane is generally used as a polymer electrolyte membrane in a fuel cell, and any one made of a polymer resin having hydrogen ion conductivity may be used. Representative examples thereof include a polymer resin having a cation exchange group selected from the group consisting of sulfonic acid group, carboxylic acid group, phosphoric acid group, phosphonic acid group and derivatives thereof in the side chain.

Representative examples of the polymer resin include a fluorine polymer, a benzimidazole polymer, a polyimide polymer, a polyetherimide polymer, a polyphenylene sulfide polymer, a polysulfone polymer, a polyether sulfone polymer and a polyether ketone It may include one or more selected from a polymer, a polyether-ether ketone-based polymer or a polyphenylquinoxaline-based polymer, more preferably poly (perfluorosulfonic acid) (generally marketed as Nafion), Poly (perfluorocarboxylic acid), copolymers of tetrafluoroethylene and fluorovinyl ether containing sulfonic acid groups, defluorinated sulfide polyether ketones, aryl ketones, poly (2,2'-m-phenylene) Or at least one selected from -5,5'-bibenzimidazole (poly (2,2 '-(m-phenylene) -5,5'-bibenzimidazole) or poly (2,5-benzimidazole) Can be.

In the hydrogen ion conductive group of the hydrogen ion conductive polymer, H may be substituted with Na, K, Li, Cs or tetrabutylammonium. In the hydrogen ion conductive group of the hydrogen ion conductive polymer, NaOH is substituted when H is replaced with Na, and tetrabutylammonium hydroxide is used when the substituent is substituted with tetrabutylammonium. It can be substituted using. Since this substitution method is well known in the art, detailed description thereof will be omitted.

The fuel cell system of the present invention includes at least one electricity generating portion, a fuel supply portion and an oxidant supply portion.

The electricity generating portion includes a membrane-electrode assembly and a separator (also called bipolar plate). The membrane-electrode assembly includes a polymer electrolyte membrane and cathode and anode electrodes existing on both sides of the polymer electrolyte membrane. The electricity generation unit serves to generate electricity through the oxidation reaction of the fuel and the reduction reaction of the oxidant.

The fuel supply unit serves to supply fuel to the electricity generation unit, and the oxidant supply unit serves to supply an oxidant such as oxygen or air to the electricity generation unit.

In the present invention, the fuel may include hydrogen or hydrocarbon fuel in gas or liquid state. Representative examples of the hydrocarbon fuel include methanol, ethanol, propanol, butanol or natural gas.

A schematic structure of the fuel cell system of the present invention is shown in FIG. 1, which will be described in more detail with reference to the following. Although the structure shown in FIG. 1 shows a system for supplying fuel and oxidant to an electric generator using a pump, the fuel cell system of the present invention is not limited to such a structure, and a fuel cell using a diffusion method without using a pump is shown. Of course, it can also be used for system architecture.

The fuel cell system 1 of the present invention includes at least one electricity generation unit 3 for generating electrical energy through an oxidation reaction of a fuel and a reduction reaction of an oxidant, a fuel supply unit 5 for supplying the fuel, And an oxidant supply unit 7 for supplying an oxidant to the electricity generating unit 3.

In addition, the fuel supply unit 5 for supplying the fuel may include a fuel tank 9 storing fuel and a fuel pump 11 connected to the fuel tank 9. The fuel pump 11 serves to discharge the fuel stored in the fuel tank 9 by a predetermined pumping force.

The oxidant supply unit 7 for supplying the oxidant to the electricity generating unit 3 includes at least one oxidant pump 13 for sucking the oxidant with a predetermined pumping force.

The electricity generator 3 is composed of a membrane-electrode assembly 17 for oxidizing and reducing a fuel and an oxidant, and a separator 19 and 19 'for supplying fuel and an oxidant to both sides of the membrane-electrode assembly. At least one of these electricity generating units 3 constitutes a stack 15.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention and the present invention is not limited to the following examples.

(Example 1)

A mixture of 12.8 mM concentration was prepared by mixing a platinum catalyst precursor and a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 94: 6. The mixture was irradiated with an RF glow discharge plasma generated by RF having a frequency of 13.56Mhz to prepare a catalyst for a fuel cell. At the time of irradiation of the said RF glow discharge plasma, the mixed gas which mixed argon gas and hydrogen in 99: 1 volume ratio was injected, and irradiation time was 1 minute.

(Example 2)

A mixture of 12.8 mM concentration was prepared by mixing a platinum catalyst precursor and a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 94: 6. This mixture was irradiated with microwave glow discharge plasma generated with a microwave having a frequency of 2.45 GHz to prepare a catalyst for a fuel cell. When the microwave glow discharge plasma was irradiated, argon gas and hydrogen were supplied at a volume ratio of 96: 4, and the irradiation time was 1 minute.

(Example 3)

A platinum catalyst precursor was mixed with a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 13: 1 to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 4)

A platinum catalyst precursor was mixed with a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 9: 1 to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 5)

A platinum catalyst precursor was mixed with a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 7: 1 to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 6)

A platinum catalyst precursor was mixed with a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 4: 1 to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 7)

A platinum catalyst precursor and a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 1: 2.5 were mixed to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 8)

A platinum catalyst precursor and a solvent in which water and isopropyl alcohol were mixed at a volume ratio of 1: 3.3 were mixed to prepare a mixture having a concentration of 12.8 mM. It carried out similarly to Example 1 except using this mixture.

(Example 9)

A platinum catalyst precursor and water were mixed in the reactor to prepare a mixture at a concentration of 12.8 mM. The same procedure as in Example 1 was carried out except that the mixture was used.

(Example 10)

At the time of irradiation of the said RF glow discharge plasma, it carried out similarly to Example 1 except having injected the mixed gas which mixed argon gas and hydrogen in 97: 3 volume ratio.

(Example 11)

At the time of irradiation of the said RF glow discharge plasma, it carried out similarly to Example 1 except having injected the mixed gas which mixed argon gas and hydrogen in the volume ratio of 92: 8.

(Example 12)

At the time of irradiation of the said RF glow discharge plasma, it carried out similarly to Example 1 except having injected the mixed gas which mixed argon gas and hydrogen in the volume ratio of 84: 6.

(Example 13)

When irradiating the RF glow discharge plasma, the same procedure as in Example 1 was carried out except that only argon gas was supplied without using hydrogen.

(Example 14)

The same procedure as in Example 1 was conducted except that the RF glow discharge plasma generated by the RF having a frequency of 22.7 MHz was irradiated.

(Example 15)

The same procedure as in Example 1 was conducted except that the RF glow discharge plasma generated by the RF having a frequency of 38.3 MHz was irradiated.

(Example 16)

The same procedure as in Example 1 was conducted except that the RF glow discharge plasma generated by the RF having a frequency of 47.6Mhz was irradiated.

(Example 17)

The same procedure as in Example 2 was conducted except that the microwave glow discharge plasma generated by the microwave having a frequency of 4.3 GHz was irradiated.

(Comparative Example 1)

The same procedure as in Example 1 was carried out except that the RF glow discharge plasma was irradiated with an RF glow discharge plasma generated with RF having a frequency of 50 Hz.

(Comparative Example 2)

The mixture prepared according to Example 1 was intended to irradiate DC (direct current) glow discharge plasma at atmospheric pressure, but the experiment failed. This is the result obtained because the DC glow discharge plasma can be generated only in a vacuum state.

Photographing

Experiments were carried out to prepare catalysts for fuel cells according to Examples 1 to 17, of which the catalysts prepared according to Example 1 are shown in FIG. Referring to FIG. 2, it can be seen that the yellowish platinum-based catalyst precursor (a) is reduced to the black catalyst (b) by the atmospheric plasma.

In Comparative Example 1, the color of the platinum-based catalyst precursor did not change when the RF glow discharge plasma generated by RF having a frequency of 50 Hz was irradiated. Thus, it was confirmed that no reaction occurred under these conditions.

In the fuel cell catalyst production method of the present invention, the catalyst can be produced in a reproducible manner in a simple process using an atmospheric plasma, and mass production is possible.

Claims (16)

Mixing a platinum-based catalyst precursor and a solvent to prepare a mixture; And Irradiating atmospheric plasma to the mixture Including, The solvent is a method for producing a catalyst for a fuel cell is a mixture of water and alcohol or tetrahydrofuran in a volume ratio of 16: 1 to 1: 16. In accordance with paragraph 1, The platinum-based catalyst precursor is H ₂ PtCl ₆ , K ₂ (PtCl ₄ ), H ₂ Pt (OH) ₆ , Pt (NO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] Cl ₂ , [Pt (NH ₃ ) ₄ ] (HCO ₃ ) ₂ , [Pt (NH ₃ ) ₄ ] (OAc) ₂ , (NH ₄ ) ₂ PtBr ₆ , (NH ₃ ) ₂ PtCl ₆ , hydrates thereof, and mixtures thereof A method for producing a catalyst for a fuel cell. delete delete The method of claim 1, Wherein the alcohol is selected from the group consisting of isopropyl alcohol, methanol, ethanol, n-propyl alcohol, butanol, ethylene glycol, glycerol, and combinations thereof. delete The method of claim 1, The water and the alcohol or tetrahydrofuran is a method for producing a catalyst for a fuel cell that is mixed in a volume ratio of 4: 1 to 1: 4. The method of claim 7, wherein The water and the alcohol or tetrahydrofuran is a method of producing a catalyst for a fuel cell is mixed in a volume ratio of 2: 1 to 1: 1. The method of claim 1, The mixture production step is a method for producing a catalyst for a fuel cell that is further adding a carrier. The method of claim 1, Wherein the atmospheric plasma is generated by a power supply having a frequency of 500 kHz to 5 GHz. The method of claim 10, Wherein said power supply is RF or microwave. The method of claim 1, The atmospheric plasma is a method of producing a catalyst for a fuel cell that is generated by RF having a frequency of 10 to 50Mhz. The method of claim 1, Wherein said atmospheric plasma is generated by a microwave having a frequency of 1 to 5 GHz. The method of claim 1, The atmospheric plasma irradiation step is a method for producing a catalyst for a fuel cell that is carried out under an inert gas. The method of claim 1, The atmospheric plasma irradiation step is carried out while blowing hydrogen under an inert gas to produce a catalyst for a fuel cell. The method of claim 14, The amount of hydrogen is 0.1 to 20% by volume based on the volume of the inert gas, the method for producing a catalyst for a fuel cell.

Images