WO2022245068A1 - 수전해용 환원 촉매 및 이의 제조 방법 - Google Patents
수전해용 환원 촉매 및 이의 제조 방법 Download PDFInfo
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- WO2022245068A1 WO2022245068A1 PCT/KR2022/006941 KR2022006941W WO2022245068A1 WO 2022245068 A1 WO2022245068 A1 WO 2022245068A1 KR 2022006941 W KR2022006941 W KR 2022006941W WO 2022245068 A1 WO2022245068 A1 WO 2022245068A1
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- metal
- carbon
- water electrolysis
- reduction catalyst
- supported
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- 239000003054 catalyst Substances 0.000 title claims abstract description 243
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/33—Electric or magnetic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
- C25B11/089—Alloys
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
- C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Definitions
- the present invention relates to a reduction catalyst for water electrolysis using a protective coating, a method for preparing the same, a reduction electrode for alkaline water electrolysis including the reduction catalyst prepared therefrom, and an alkaline water electrolysis system including the same.
- the present invention relates to a method for preparing a reduction catalyst for water electrolysis using a polydopamine protective coating, a reduction catalyst prepared therefrom, a reduction electrode for alkaline water electrolysis including the same, and an alkaline water electrolysis system including the same.
- Hydrogen energy is attracting attention as an eco-friendly energy alternative to fossil fuels in that it is rich in resources and does not emit harmful substances.
- Alkaline water electrolysis one of the methods for producing hydrogen, has been verified for its stability and price competitiveness, but its efficiency is relatively low compared to other water electrolysis technologies (alkaline water electrolysis ⁇ 67%, polymer electrolyte membrane water electrolysis ⁇ 90%, solid oxide Water electrolysis ⁇ 94%) has its drawbacks.
- the hydrogen evolution reaction (HER) rate at the cathode is fast in acidic electrolytes, so the overvoltage is low, but in alkaline electrolytes, the HER rate is 2 to 3 times lower than that in acidic electrolytes. Therefore, it can be said that the study of HER catalyst in alkaline water electrolysis is important.
- platinum (Pt) and platinum (Pt)-based alloy catalysts are known to exhibit high performance and stability.
- platinum is an expensive and limited precious metal, it can be said to be the main reason for increasing the price of the alkaline water electrolysis system. Therefore, many studies are being conducted to maximize catalytic activity and replace platinum.
- Catalyst materials that can replace platinum include inexpensive transition metals such as Ni, Fe, Co, Mo, and Sn. Among them, Ni is known to have high electrochemical kinetics and excellent corrosion resistance in alkaline solutions, and because it is easy to alloy with other metals, research on Ni-based alloy catalysts is being actively conducted.
- Ni-based alloy catalysts can increase electrochemical activity through changes in physical structure and electronic structure through alloying, and various studies are being conducted on NiCo, NiFe, NiMo, NiCu, Ni 2 P, and NiSe. Among them, the NiMo alloy catalyst can lead to more hydrogen generation by optimizing the H ads adsorption and H ads recombination reaction through the synergistic effect of Mo, which has high hydrogen adsorption energy, and Ni, which has relatively weak adsorption energy.
- NiMo alloy can be mainly manufactured by two methods: electroplating method and powder method. When manufacturing an alloy by electroplating, the manufacturing method has the advantage of being simple, but the NiMo structure control and Mo content control are difficult. In addition, when manufacturing by electroplating, as the Mo content is increased, pores are generated in the alloy, and hydrogen penetrates into the pores and cracks occur during HER operation.
- NiMo alloys when manufacturing NiMo alloys by the powder method, alloys with various structures and composition ratios can be realized.
- the alloying degree can be increased through high-temperature heat treatment, so the catalyst stability is good compared to the plating method.
- the sintering of the alloy that is, the growth of the alloy particle size, occurs during the high-temperature heat treatment, which is mainly used in the powder method, and the catalyst surface area is reduced, and as a result, the electrochemical activity is lowered.
- the present invention is to provide a method for preparing a reduction catalyst for water electrolysis capable of suppressing particle size growth during high-temperature heat treatment and increasing an alloying degree, and a reduction catalyst for water electrolysis prepared therefrom.
- the present invention is to provide a method for preparing a reduction catalyst for water electrolysis in which a protective coating method is introduced to suppress particle size growth during high-temperature heat treatment, and a reduction catalyst for water electrolysis prepared therefrom.
- the present invention is specifically intended to provide a method for preparing a reduction catalyst for water electrolysis used in a reduction electrode for water electrolysis using a non-noble metal and a reduction catalyst for water electrolysis prepared therefrom.
- the present invention is also intended to provide a reduction electrode for alkaline water electrolysis and an alkaline water electrolysis system including the reduction catalyst for water electrolysis manufactured by the above manufacturing method.
- first metal-carbon catalyst precursor in which the first metal is supported on a carbon support
- PDA polydopamine
- obtaining a reduction catalyst for water electrolysis comprising a carbon-supported first metal-second metal alloy by heat-treating the first metal-second metal-carbon precursor, wherein the first metal and the second metal are Provided is a method for preparing a reduction catalyst for water electrolysis, which is a transition metal different from each other.
- the present invention also includes a carbon-supported first metal-second metal alloy, wherein the first metal and the second metal are transition metals different from each other, and the molar ratio of the first metal to the second metal is 7:3 to 3: 7, a reduction catalyst for water electrolysis is provided.
- the present invention also, a metal current collector; and a catalyst layer including the reduction catalyst for water electrolysis prepared by the manufacturing method formed on the metal current collector.
- the present invention also, an electrolyte solution; anode; a diaphragm for ion exchange; And it provides an alkaline water electrolysis system comprising a reduction electrode including a reduction catalyst for water electrolysis prepared by the above production method.
- the method of preparing a reduction catalyst for water electrolysis of the present invention can manufacture and provide a catalyst having a high alloying degree by suppressing the growth of alloy particles in a subsequent high-temperature heat treatment step by applying a protective coating method.
- the manufacturing method of the reduction catalyst for water electrolysis of the present invention exhibits similar HER (Hydrogen Evolution Reaction) performance to platinum, a noble metal catalyst, despite the use of a non-noble metal alloy, and thus has excellent catalytic properties.
- the reduction catalyst can be very preferably applied to an alkaline water electrolysis reduction electrode.
- FIG. 1 is a schematic diagram showing a method for preparing a reduction catalyst for water electrolysis including a carbon-supported Ni-Mo alloy using the PDA protective coating method of one embodiment of the present invention.
- TEM 2 is a transmission electron microscope (Transmission electron microscopy) of a carbon-supported first metal-second metal alloy precursor before (a) and after (b) heat treatment in the reduction catalyst manufacturing method using the PDA protective coating method of an embodiment of the present invention. , TEM) images are shown.
- XRD X-ray diffraction
- FIG. 4 is a comparative graph evaluating HER of reduction catalysts using a PDA protective coating prepared by varying heat treatment temperatures of 500, 600, 700, 800, and 900 ° C.
- Figure 6 shows the HER of the reduction catalyst using the PDA protective coating prepared by heat treatment at 700 ° C. with different Ni: Mo molar ratios of 1:9, 2:8, 3:7, 4:6, 5:5 and 7:3 It is a comparison graph evaluating .
- a reduction catalyst (a) prepared by using a PDA protective coating and varying the heat treatment temperature at 500, 600, and 700 ° C. and a catalyst prepared by varying the heat treatment temperature at 500, 600, and 700 ° C. It is an XRD pattern image of the reduction catalyst (b).
- FIG. 8 is a graph comparing HER of a reduction catalyst using a PDA protective coating and a reduction catalyst prepared by varying heat treatment temperatures of 500, 600, and 700° C. without applying the PDA protective coating.
- 10 is an XRD pattern image of a reduction catalyst prepared by varying the loading amount of the reduction catalyst prepared according to the present invention to 20wt% and 40wt%.
- 11 is a comparative graph evaluating the HER of reduction catalysts prepared by varying the loading amount of the reduction catalyst prepared according to the present invention to 20wt% and 40wt%.
- FIG. 12 is a schematic diagram showing a method for preparing a reduction catalyst for water electrolysis comprising a carbon-supported Co-Mo alloy using a PDA protective coating according to the present invention.
- 13 is an XRD pattern image of a reduction catalyst using a PDA protective coating prepared by heat treatment at 700° C. at different Co:Mo molar ratios of 3:7, 5:5, and 7:3.
- 14 is a comparative graph evaluating the HER of reduction catalysts using PDA protective coatings prepared by heat treatment at 700° C. at different Co:Mo molar ratios of 3:7, 5:5, and 7:3.
- 15 is a schematic diagram showing a method for producing a reduction catalyst comprising a carbon-supported Ni—Co alloy using a PDA protective coating according to the present invention.
- 16 is an XRD pattern image of a reduction catalyst using a PDA protective coating prepared by heat treatment at 700° C. at different Ni:Co molar ratios of 3:7, 5:5, and 7:3.
- 17 is a comparative graph evaluating HER of reduction catalysts using PDA protective coatings prepared by heat treatment at 700° C. at different Ni:Co molar ratios of 3:7, 5:5, and 7:3.
- first and second are used to describe various components, and the terms are used only for the purpose of distinguishing one component from another.
- each layer or element when each layer or element is referred to as being formed “on” or “above” each layer or element, it means that each layer or element is directly formed on each layer or element, or other This means that layers or elements may be additionally formed between each layer or on the object or substrate.
- forming a first metal-carbon catalyst precursor in which the first metal is supported on a carbon support coating the first metal-carbon catalyst precursor with polydopamine (PDA); forming a first metal-second metal-carbon precursor by additionally supporting a second metal on the coated first metal-carbon catalyst precursor; and obtaining a reduction catalyst for water electrolysis comprising a first metal-second metal alloy by heat-treating the first metal-second metal-carbon precursor.
- PDA polydopamine
- the present inventors applied polydopamine as a capping material to a platinum catalyst supported on carbon, suppressing the growth of particle size during a high-temperature heat treatment process, while having a surface layer made of platinum having a high alloying degree and a core made of a transition metal.
- a method for preparing a reduction catalyst for water electrolysis using a non-noble transition metal rather than an expensive platinum group metal was devised.
- Polydopamine applied as a capping material is a material with high adhesion and can be coated thinly and evenly, thereby suppressing particle size growth during heat treatment and at the same time easily diffusing transition metals to prepare a reduction catalyst containing an alloy with a high alloying degree. This makes it possible to manufacture a reduction catalyst with excellent catalyst activity and durability.
- polydopamine can self-polymerize at room temperature, it has the advantage of being able to be coated without additional reagents or equipment, and thus has the advantage of excellent manufacturing process cost and process efficiency.
- the polydopamine coating method proposed in the present invention is applied, although the polydopamine coating is carbonized in the subsequent heat treatment step, metal particle growth can be inhibited and nano-sized metal particles can be supported more evenly during the heat treatment.
- the first metal and the second metal may be different transition metals.
- two or more types of metals are supported on the carbon support, and each of the first metal and the second metal is a transition metal different from each other and is not a platinum group metal. Specific metal types are described more specifically below.
- the molar ratio of the first metal to the second metal may be 7:3 to 3:7.
- the molar ratio of the first metal to the second metal may be 5:5 to 3:7 or 4:6 to 3:7.
- the molar ratio of the first metal to the second metal may vary depending on the type of metal to be combined.
- the molar ratio of the first metal to the second metal may be 3.5:6.5 or 3.2:6.8, and the most Preferably it may be 3:7.
- the molar ratio of the first metal to the second metal may be 4.5:5.5 or 4.8:5.2, most preferably 5:5.
- the first metal or the second metal may be each independently selected from the group consisting of Ni, Co, Mo, Fe, Sn, and Cu.
- the combination of the first metal and the second metal may be Ni-Mo, Co-Mo, or Ni-Co.
- a loading amount of the first metal and the second metal may be 20% by weight or more based on the weight of the carbon support.
- the supported amount of the first metal and the second metal may be 20 wt% to 60 wt%, 20 wt% to 40 wt% based on the weight of the carbon support, and preferably, the supported amount may be 40 wt%.
- the loading amount refers to the ratio of the total amount of the first metal and the second metal loaded to the weight of the carbon support.
- the supported amount is less than 20% by weight, it is difficult to expect an appropriate reduction effect because the amount of metal nanoparticles serving as a catalyst is small. Therefore, the supported amount is preferably 20% by weight or more.
- the loading ratio refers to the ratio of the first metal or the second metal in the loading amount.
- the particle size of the first metal and the second metal supported on the reduction catalyst for water electrolysis may be 10 to 20 nm. Specifically, it may be 10 to 15 nm. Preferably it may be 10 to 12 nm.
- the manufacturing method of the present invention inhibits sintering between metal nanoparticles by introducing the formation of a polydopamine coating layer, and the first metal and the second metal supported on the reduction catalyst for water electrolysis obtained from the manufacturing method of the present invention have a particle size of It is small enough to maximize the active surface area.
- the carbon support may be at least one selected from the group consisting of carbon black, carbon nanotubes, carbon nanofibers, carbon nanocoils, and carbon nanocages. More specifically, Vulcan XC 72R among carbon blacks may be used as the carbon support.
- the heat treatment temperature may be 600 to 900°C.
- the heat treatment temperature may be 650 to 900 °C, or 650 to 800 °C, or 650 to 750 °C, or 670 to 730 °C.
- the heat treatment temperature is 700°C.
- the heat treatment temperature is too low, for example, below 600° C., diffusion of the second metal is not properly performed, so that the transition metal does not migrate into the carbon support, and MnO 2 and MoO 3 instead of Mo 2 C are generated, resulting in poor HER performance. There may be issues with being inferior.
- the heat treatment temperature is too high, diffusion of the second metal is easy, but the metal becomes coarse due to sintering and the activation surface area becomes small, resulting in poor HER performance.
- the heat treatment atmosphere may be a mixture of hydrogen and an inert gas.
- hydrogen:inert gas may be mixed in a volume ratio of 10:30 to 50. Specifically, hydrogen:inert gas may be mixed at a volume ratio of 10:35 to 45, preferably at a volume ratio of 10:40.
- the inert gas may be argon (Ar).
- the present invention includes a carbon-supported first metal-second metal alloy, wherein the first metal and the second metal are transition metals different from each other, and the molar ratio of the first metal to the second metal is 7:3 to 3:7, a reduction catalyst for water electrolysis can be provided.
- the first metal or the second metal included in the reduction catalyst for water electrolysis may be each independently selected from the group consisting of Ni, Co, Mo, Fe, Sn, and Cu.
- the supported amount of the first metal or the second metal may be 20% by weight or more based on the carbon weight.
- a particle size of the first metal-second metal alloy supported on the carbon may be 10 to 20 nm.
- the reduction catalyst for water electrolysis may be one obtained from the above-described production method. Therefore, the specific range of the molar ratio of the first metal to the second metal, the type of the first metal or the second metal, the supported amount, and the particle size of the alloy of the reduction catalyst for water electrolysis and the effects thereof are as described in the description of the manufacturing method. same.
- the reduction catalyst for water electrolysis prepared according to the production method of the present invention can be used for a reduction electrode for alkaline water electrolysis. More specifically, a metal current collector; and a catalyst layer formed on the metal current collector and including a reduction catalyst for water electrolysis prepared according to the manufacturing method of the present invention.
- an electrolyte solution; anode; a diaphragm for ion exchange; and a reduction electrode including the reduction catalyst for water electrolysis prepared according to the manufacturing method of the present invention.
- n wt% Ni x Mo y /CDm means that the amount of Ni-Mo alloy supported on the carbon support is n wt%, the Ni and Mo molar ratio is x: y, and the PDA coating progresses
- a reduction catalyst for water electrolysis comprising a carbon-supported alloy subjected to heat treatment at m ° C, n wt% Ni x Mo y / Cm, the supported amount of the alloy on the carbon support is n wt%, and the Ni and Mo molar ratio is x: y
- n wt% Ni / C is for water electrolysis containing carbon-supported Ni having a Ni loading amount of n wt%
- Means a reduction catalyst, n wt% Mo 2 C means a reduction catalyst for water electrolysis
- FIG. 1 is a schematic diagram showing a method for preparing a reduction catalyst for water electrolysis comprising a carbon-supported Ni-Mo alloy using a PDA protective coating according to the present invention.
- NiCl 2 6H 2 O nickel chloride
- ethylene glycol 50mL
- Hydrothermal synthesis was performed. After the hydrothermal synthesis was completed, the above solution was filtered using a vacuum filtration device. After that, it was washed three times with deionized water and dried in an oven at 80 ° C. for 3 hours to remove impurities, and a carbon-supported Ni precursor was obtained.
- a pH 8.5 Tris-buffer solution was prepared. At this time, since pH must be accurately adjusted for uniform synthesis of dopamine, 121 mg of tris aminomethane was added to 100 mL of deionized water and stirred for 1 hour. After stirring was completed, 0.5 M HCl was added by 0.2 mL each using a micro pipette.
- the pH was measured every time 0.2 mL of 0.5 M HCl was added. After the addition of HCl was stopped when the pH reached 8.5, it was stirred for 2 hours. 30 mL of the previously prepared Tris-buffered solution was adjusted to 25° C., and 120 mg of the prepared carbon-supported Ni catalyst was added thereto. After stirring this solution for 30 minutes, a solution obtained by dissolving 120 mg of dopamine hydrochloride in 10 mL of a Tris-buffered solution was added thereto, followed by stirring for 24 hours. In this step, dopamine is coated on the Ni precursor on carbon. The coated sample was recovered using a vacuum filter and washed twice with deionized water. After drying in an oven at 80° C. for 3 hours, the Ni precursor supported on the PDA-coated carbon was recovered.
- a reduction catalyst for water electrolysis comprising a carbon-supported Ni-Mo alloy having a supported amount of 20 wt% prepared by putting the prepared carbon-supported Ni-Mo precursor in a furnace and heat-treating it for 1 hour in an atmosphere of 700 ° C., 80% argon, and 20% hydrogen. (20wt% Ni 3 Mo 7 /CD-700) was recovered.
- reduction catalysts By controlling the amount of nickel chloride and sodium molybdate used, reduction catalysts with different supported amounts and different molar ratios of Ni-Mo can be prepared.
- 2 shows TEM images before and after heat treatment during preparation of a reduction catalyst for water electrolysis using a PDA protective coating according to the present invention.
- 2 (a) is an image taken before heat treatment of an alloy precursor impregnated with Mo into carbon-supported Ni (Ni/C) coated using PDA as a capping material.
- Figure 2 (b) is an image taken after heat treatment of the carbon-supported alloy precursor at 700 °C.
- FIG. 2 (a) it was confirmed that a PDA layer was formed.
- FIG. 2 (b) it was confirmed that the PDA coating layer evenly covering the reduction catalyst for water electrolysis was carbonized through heat treatment. Despite the high-temperature heat treatment due to the protective coating effect, it was confirmed that the particles of 10 to 20 nm were evenly supported without growth of the particles.
- FIG. 12 is a schematic diagram showing a method for preparing a reduction catalyst for water electrolysis comprising a carbon-supported Co-Mo alloy using a PDA protective coating according to the present invention.
- Co Co
- Mo molybdenum
- the dopamine coating step was performed as in Example 1 above. 30 mL of the prepared tris-buffer solution was adjusted to 25° C., and 120 mg of the prepared carbon-supported Co precursor was added thereto. After stirring this solution for 30 minutes, a solution obtained by dissolving 120 mg of dopamine hydrochloride in 10 mL of a Tris-buffered solution was added thereto, followed by stirring for 24 hours. In this step, dopamine was coated onto the Co precursor on carbon. The coated sample was recovered using a vacuum filter and washed twice with deionized water. After drying in an oven at 80° C. for 3 hours, the Co precursor supported on the PDA-coated carbon was recovered.
- a reduction catalyst for water electrolysis comprising a carbon-supported Co-Mo alloy having a supported amount of 20 wt% prepared by putting the prepared carbon-supported Co-Mo precursor in a furnace and heat-treating the prepared carbon-supported Co-Mo precursor for 1 hour in an atmosphere of 700 ° C., 80% argon, and 20% hydrogen. (20wt% Co 5 Mo 5 /CD-700) was recovered.
- Reduction catalysts for water electrolysis with different supported amounts and different molar ratios of Co-Mo may be prepared by controlling the amount of cobalt supporting material and sodium molybdate used.
- the reduction catalyst for water electrolysis containing a carbon-supported Co-Mo alloy Like the reduction catalyst for water electrolysis containing a carbon-supported Co-Mo alloy, the reduction catalyst for water electrolysis containing a carbon-supported Ni-Mo alloy also decomposes by heat during high-temperature heat treatment, but in the meantime, The growth of Co-Mo grains is suppressed. In addition, as the heat treatment proceeded, the impregnated Mo diffused into the Co during the process of decomposition of the PDA, finally obtaining a reduction catalyst for water electrolysis including a carbon-supported Co-Mo alloy.
- 15 is a schematic diagram showing a method for preparing a reduction catalyst for water electrolysis comprising a carbon-supported Ni—Co alloy using a PDA protective coating according to the present invention.
- NiCl 2 6H 2 O nickel chloride
- carbon 100 mg
- ethylene glycol 50 mL
- a convection oven was used for 24 hours at 180 ° C.
- Hydrothermal synthesis was performed. After the hydrothermal synthesis was completed, the above solution was filtered using a vacuum filtration device. After that, it was washed three times with deionized water and dried in an oven at 80 ° C. for 3 hours to remove impurities, and a carbon-supported Ni precursor was obtained.
- the dopamine coating step was performed as in Example 1 above. 30 mL of the prepared tris-buffer solution was adjusted to 25 ° C, and then 120 mg of the prepared carbon-supported Ni precursor was added. After stirring this solution for 30 minutes, a solution obtained by dissolving 120 mg of dopamine hydrochloride in 10 mL of a Tris-buffered solution was added thereto, followed by stirring for 24 hours. In this step, dopamine was coated on the Ni precursor on carbon. The coated sample was recovered using a vacuum filter and washed twice with deionized water. After drying in an oven at 80° C. for 3 hours, the PDA-coated carbon-supported Ni precursor was recovered.
- a reduction catalyst for water electrolysis comprising a carbon-supported Ni-Co alloy having a supported amount of 20 wt% prepared by putting the prepared carbon-supported Ni-Co precursor in a furnace and heat-treating the prepared carbon-supported Ni-Co precursor for 1 hour in an atmosphere of 700 ° C., 80% argon, and 20% hydrogen. (20wt% Ni 5 Co 5 /CD-700) was recovered.
- Reduction catalysts for water electrolysis with different loading amounts and ni-Co molar ratios can be prepared by controlling the amounts of the cobalt loading material and nickel chloride used.
- the reduction catalyst for water electrolysis containing a carbon-supported Ni-Co alloy Like the reduction catalyst for water electrolysis containing a carbon-supported Ni-Co alloy, the reduction catalyst for water electrolysis containing a carbon-supported Ni-Mo alloy also decomposes PDA by heat during high-temperature heat treatment, but in the meantime, the coating by the PDA The growth of Ni-Co grains is suppressed. In addition, as the heat treatment proceeded, the impregnated Co diffused into the Ni during the process of decomposition of the PDA, finally obtaining a reduction catalyst for water electrolysis including a carbon-supported Ni—Co alloy.
- a carbon-supported Ni catalyst (Ni/C) was prepared by a hydrothermal synthesis process.
- Example 2 Without performing the hydrothermal synthesis process of supporting Ni on the carbon of Example 1, PDA was coated on the carbon support and Mo was impregnated, and then in the same condition as Example 1 at 700 ° C., 20% hydrogen, 80% argon. A carbon-supported Mo catalyst (Mo 2 C) was prepared by heat treatment for 1 hour.
- Example 2 Without performing the PDA coating process of Example 1, Mo was impregnated into the carbon-supported Ni precursor through hydrothermal synthesis, followed by heat treatment for 1 hour at 700 ° C., 20% hydrogen, 80% argon conditions in the same manner as in Example 1 A reduction catalyst for water electrolysis (20wt% Ni 3 Mo 7 /C-700) containing a carbon-supported Ni-Mo alloy was prepared.
- Platinum (Pt) was supported on the carbon (C) support as the first metal, and after coating using PDA as a capping agent, nickel (Ni) was supported as the second metal and a precursor deposition method was applied. . Thereafter, a high-temperature heat treatment was performed to prepare a reduction catalyst for water electrolysis including a carbon-supported Pt-Ni alloy.
- the pH was adjusted to 2-3 by lowering the pH using 0.1MH 2 SO 4 , and after the adjustment, the mixture was further stirred for 24 hours.
- the above solution was filtered using a vacuum filtration device. After that, it was washed three times with deionized water and dried at 80 ° C. for 3 hours to remove impurities, and carbon-supported Pt was obtained.
- the dopamine coating step was performed as in Example 1 above. 30 mL of the prepared Tris-buffer solution was adjusted to 25° C., and 175 mg of the prepared carbon-supported Pt precursor was added thereto. After stirring this solution for 30 minutes, a solution obtained by dissolving 120 mg of dopamine hydrochloride in 10 mL of a Tris-buffered solution was added thereto, followed by stirring for 24 hours. In this step, dopamine was coated onto the Pt precursor on carbon. The coated sample was recovered using a vacuum filter and washed twice with deionized water. After drying in an oven at 80° C. for 3 hours, the PDA-coated carbon-supported Pt precursor was recovered.
- the carbon-supported Pt-Ni precursor prepared above was put into a furnace and heat-treated for 1 hour in an atmosphere of 700 ° C., 80% argon, and 20% hydrogen, including a carbon-supported Pt-Ni alloy having a supported amount of 20 wt% at a molar ratio of 2: 1
- a reduction catalyst for water electrolysis (20wt% Pt 2 Ni/CD-700) was recovered.
- Test Example 1 a test was conducted to evaluate the characteristics of the reduction catalyst according to the heat treatment temperature when preparing a reduction catalyst for water electrolysis including a carbon-supported Ni-Mo alloy using a PDA protective coating. Preparation of a reduction catalyst for water electrolysis comprising a carbon-supported Ni-Mo alloy is the same as in Example 1 described above.
- the heat treatment temperature is one of the important factors determining the alloy degree and particle size of the alloy included in the reduction catalyst. In general, as the heat treatment temperature increases, the alloying degree increases and the durability and activity of the catalyst are improved. However, as the heat treatment temperature increases, the catalyst active area decreases due to the increase in the particle size of the catalyst and the agglomeration of the particles.
- [Table 1] shows the XRD particle size and loading ratio of the reduction catalyst for water electrolysis using the PDA protective coating prepared by varying the heat treatment temperature at 500, 600, 700, 800, and 900 ° C.
- the particle size of the reduction catalyst for water electrolysis prepared by applying the PDA protective coating tended to increase as the heat treatment temperature increased. This means that the size of the particles increases as the temperature increases because the PDA coating layer does not completely suppress sintering of the particles during the high-temperature heat treatment.
- the supporting ratio was similar regardless of the heat treatment temperature.
- FIG. 4 is a comparative graph in which HER of reduction catalysts using a PDA protective coating prepared by varying heat treatment temperatures of 500, 600, 700, 800, and 900° C. was evaluated through changes in voltage and current density.
- a Rotating Disk Electrode (RDE) tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, platinum (Pt) wire for the counter electrode, and 1M KOH as the electrolyte.
- Table 2 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Ni 5 Mo 5 /CD-500 287.5 20wt% Ni 5 Mo 5 /CD-600 173.1 20wt% Ni 5 Mo 5 /CD-700 104.4 20wt% Ni 5 Mo 5 /CD-800 122.1 20wt% Ni 5 Mo 5 /CD-900 107.1
- the reduction catalyst (20wt% Ni 5 Mo 5 /CD) prepared by PDA protective coating showed the highest value at 104.4 mV at @10 mA cm -2 when the heat treatment temperature was 700 °C. showed excellent HER performance.
- Mo mainly exists as MoO 2 and MoO 3 , and it was confirmed that they do not contribute to HER.
- heat treatment at 700 ° C it was found that the Ni peak was shifted to an alloy of Ni and Mo, and Mo also reacted with carbon to form Mo 2 C.
- Mo 2 C is also known to be reactive with HER, but when the temperature reaches 800°C or 900°C, not only does the particle size grow excessively, but Mo 2 C exists mainly as Mo 2 C rather than Mo becoming an alloy with Ni. It was confirmed that HER performance was reduced.
- Example 3 a test was conducted to evaluate the characteristics according to the Ni: Mo molar ratio during the preparation of a reduction catalyst for water electrolysis comprising a carbon-supported Ni-Mo alloy using a PDA protective coating.
- Figure 5 is XRD of a reduction catalyst using a PDA protective coating prepared by heat treatment at 700 ° C. with different Ni: Mo molar ratios of 1: 9, 2: 8, 3: 7, 4: 6, 5: 5 and 7: 3 This is a pattern image.
- the Ni peak tended to shift in the negative direction. This means that as the content of Mo increases, the Mo atoms expand the lattice and shift the Ni peak, thereby increasing the alloying degree of the alloy included in the reduction catalyst.
- the Ni peak tends to disappear, and when the molar ratio of Ni to Mo is 3:7, 4:6, 5:5, and 7:3, the peak of Ni and Mo 2 C is the main A peak could be seen.
- the Mo 2 C peak appeared most prominently.
- the peak of Mo 2 C decreased and MoO 2 and MoO 3 peaks were formed.
- the supporting ratio is shown in [Table 3] below.
- the supporting ratio was formed to match the intended molar ratio.
- the particle size remained constant at 12 nm regardless of the composition.
- the XRD peak was not detected, so the particle size according to XRD could not be calculated.
- Test Example 4 a test was conducted to evaluate HER according to the Ni: Mo molar ratio when preparing a reduction catalyst for water electrolysis including a carbon-supported Ni-Mo alloy using a PDA protective coating.
- Figure 6 shows the voltage and current density of HER reduction catalysts using PDA protective coatings prepared by varying the Ni:Mo molar ratio of 1:9, 2:8, 3:7, 4:6, 5:5, and 7:3 It is a comparison graph evaluated through change.
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst for water electrolysis prepared by the PDA protective coating according to the present invention is applied to the RDE tip, dried, and connected to a rotator to evaluate HER by measuring LSV under scan rate conditions of 1600 RPM and 10 mV s -1 did During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 4 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Ni/C 231.8 20wt% Ni 7 Mo 3 /CD-700 123.7 20wt% Ni 5 Mo 5 /CD-700 104.4 20wt% Ni 4 Mo 6 /CD-700 88.1 20wt% Ni 3 Mo 7 /CD-700 75.1 20wt% Ni 2 Mo 8 /CD-700 154.6 20wt% Ni 1 Mo 9 /CD-700 170 20wt% Mo 2 C 160.8 20wt% Pt2Ni/C-D-700 50.3
- the catalyst preparation method according to Comparative Example 4 forms a Ni core Pt shell structure, which is not actually a PtNi alloy, by removing residual Ni on the surface through additional acid treatment after heat treatment, and it was confirmed that there is a difference in the structure.
- 7 is an XRD pattern image of a reduction catalyst using a PDA protective coating and a reduction catalyst prepared by varying heat treatment temperatures of 500, 600, and 700 ° C. without applying the PDA protective coating.
- 7 (a) is an XRD pattern image of a reduction catalyst prepared by applying a PDA protective coating
- FIG. 7 (b) is an XRD pattern image of a reduction catalyst prepared without applying a PDA protective coating.
- the ICP loading rate showed a constant loading rate regardless of whether or not the PDA protective coating was applied.
- the particle size of the reduction catalyst with PDA protective coating was 12.5 nm, compared to 16.8 nm, which is the particle size of the reduction catalyst prepared without applying PDA protective coating. It was found that PDA acts as a capping material and can suppress the growth of the particle size in the heat treatment step . In this case, the XRD peak was not detected, so the particle size according to XRD could not be calculated.
- Test Example 6 a test was conducted to evaluate HER according to the presence or absence of a PDA protective coating when preparing a reduction catalyst for water electrolysis including a carbon-supported Ni-Mo alloy.
- FIG. 8 is a graph comparing HER of a reduction catalyst using a PDA protective coating and a reduction catalyst prepared by varying heat treatment temperatures of 500, 600, and 700 ° C without applying a PDA protective coating through changes in voltage and current density.
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst prepared by the PDA protective coating according to the present invention was applied to the RDE tip, dried, and then connected to a rotator to measure LSV at a scan rate of 1600 RPM and 10 mV ⁇ s -1 to evaluate HER. During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 6 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Ni 3 Mo 7 /CD-500 188.5 20wt% Ni 3 Mo 7 /CD-600 166.9 20wt% Ni 3 Mo 7 /CD-700 75.1 20wt% Ni 3 Mo 7 /C-500 213.3 20wt% Ni 3 Mo 7 /C-600 176.2 20wt% Ni 3 Mo 7 /C-700 102
- the HER performance of 20wt% Ni 3 Mo 7 /CD-700 to which the PDA protective coating was applied was 75.1 mV at @ 10 mA cm -2 , indicating the best HER.
- the HER of 20wt% Ni 3 Mo 7 /C-700, a reduction catalyst without PDA protective coating was 102 mV at @10 mA ⁇ cm -2 , showing lower HER than that of the reduction catalyst with PDA protective coating.
- Test Example 7 a test was conducted to evaluate the characteristics of the reduction catalyst prepared by varying the supported amount from 20wt% to 40wt% when preparing a reduction catalyst for water electrolysis containing a carbon-supported Ni-Mo alloy.
- 9 shows TEM images of reduction catalysts prepared by varying the amount of loading from 20 wt% to 40 wt%.
- 9 (a) is an image of 20wt% Ni 3 Mo 7 /CD-700 taken at high magnification
- FIG. 9 (b) is an image taken of 40wt% Ni 3 Mo 7 /CD-700 at high magnification.
- FIG. 10 is an XRD pattern image of a reduction catalyst prepared by varying the loading ratio of Ni-Mo to 20wt% and 40wt% and heat-treating at 700 ° C. after applying the PDA protective coating according to the present invention.
- the XRD peak of the reduction catalyst prepared with 40wt% was the same as the reduction catalyst prepared with 20wt%, and it was confirmed that Ni and Mo 2 C formed the main peak.
- Test Example 8 a test was conducted to compare and evaluate the HER of reduction catalysts prepared by varying the loading amount from 20 wt% to 40 wt% when preparing a reduction catalyst for water electrolysis containing a carbon-supported Ni-Mo alloy.
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst (20wt% Ni 5 Mo 5 /CD-700) prepared by PDA protective coating is applied to the RDE tip, dried, and connected to a rotator to scan at 1600 RPM and 10mV ⁇ s -1 HER was evaluated by measuring LSV under the rate condition. During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 8 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 40wt% Pt/C-JM 42.7 20wt% Ni/C 231.8 20wt% Mo 2 C 160.8 20wt% Ni 3 Mo 7 /CD-700 75.1 40wt% Ni 3 Mo 7 /CD-700 62.6
- Example 9 a test was conducted to evaluate the characteristics according to the Co: Mo molar ratio when preparing a reduction catalyst for water electrolysis containing a carbon-supported Co-Mo alloy using a PDA protective coating. A method for preparing a reduction catalyst for water electrolysis comprising a carbon-supported Co-Mo alloy was followed in Example 2.
- 13 is an XRD pattern image of a reduction catalyst using a PDA protective coating prepared by heat treatment at 700° C. at different Co: Mo molar ratios of 3:7, 5:5, and 7:3.
- the loading rate was supported according to the intended molar ratio.
- particles with an average particle size of 11 nm were formed, and it was confirmed that a particle size similar to that of the initial Co/C was formed without particle growth even after high-temperature heat treatment due to the protective coating effect.
- 20wt% Co 7 Mo 3 / In the case of CD-700 and 20wt% Co 5 Mo 5 /CD-700, the XRD peak was not detected, so the particle size according to XRD could not be calculated.
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst prepared by the PDA protective coating according to the present invention was applied to the RDE tip, dried, and then connected to a rotator to measure LSV at a scan rate of 1600 RPM and 10 mV ⁇ s -1 to evaluate HER. During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 10 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Co/C 300.4 20wt% Co 7 Mo 3 /CD-700 180.4 20wt% Co 5 Mo 5 /CD-700 134.6 20wt% Co 3 Mo 7 /CD-700 152.3
- Example 11 a test was conducted to evaluate the characteristics according to the Ni: Co molar ratio when preparing a catalyst for water electrolysis containing a carbon-supported Ni-Co alloy using a PDA protective coating.
- the manufacturing method of the reduction catalyst for water electrolysis including the carbon-supported Ni—Co alloy was in accordance with Example 3 described above.
- 16 is an XRD pattern image of a reduction catalyst using a PDA protective coating prepared by heat treatment at 700° C. at different molar ratios of Ni:Co to 3:7, 5:5, and 7:3.
- [Table 11] shows the XRD particle size and loading ratio of reduction catalysts using PDA protective coatings prepared by heat treatment at 700 ° C at different Ni: Co molar ratios of 3:7, 5:5, and 7:3. .
- the loading ratio was adjusted to the intended molar ratio.
- the particle size formed particles in the average range of 10 ⁇ 11 nm, which was confirmed to form a particle size similar to the initial Ni / C without particle growth even after high temperature heat treatment due to the protective coating effect.
- 17 is a comparison of evaluation of HER of reduction catalysts using PDA protective coatings prepared by heat treatment at 700° C. at different Ni:Co molar ratios of 3:7, 5:5, and 7:3 through voltage and current density changes it's a graph
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst prepared by the PDA protective coating according to the present invention was applied to the RDE tip, dried, and then connected to a rotator to measure LSV at a scan rate of 1600 RPM and 10 mV ⁇ s -1 to evaluate HER. During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 12 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Ni/C 231.8 20wt% Ni 7 Co 3 /CD-700 194.8 20wt% Ni 5 Co 5 /CD-700 159.4 20wt% Ni 3 Co 7 /CD-700 174.7
- Example 13 a test was conducted to compare and evaluate the HER of the reduction catalyst for water electrolysis including Ni-Mo, Co-Mo or Ni-Co alloys supported on carbon having the most excellent composition.
- an RDE tip (area of 0.196 cm 2 ) was used as a working electrode in a three-electrode system.
- the ink to be applied on the RDE tip was prepared to have a density of 350 ⁇ g ⁇ cm ⁇ 2 based on metal.
- the three-electrode system consisted of Hg/HgO for the reference electrode, Pt wire for the counter electrode, and 1M KOH as the electrolyte.
- the ink of the reduction catalyst prepared by the PDA protective coating according to the present invention was applied to the RDE tip, dried, and then connected to a rotator to measure LSV at a scan rate of 1600 RPM and 10 mV ⁇ s -1 to evaluate HER. During the LSV measurement, when the current density reached -60 mA cm -2 or the voltage reached -0.4 V, the LSV measurement was stopped.
- Table 13 shows the results of measuring overpotential (mV) at a current density of 10 mA/cm 2 .
- Catalyst composition, PDA coating and heat treatment temperature Overvoltage@10mA cm -2 (mV) 20wt% Ni/C 231.8 20wt% Ni 3 Mo 7 /CD-700 75.1 20wt% Co 5 Mo 5 /CD-700 134.6 20wt% Ni 5 Co 5 /CD-700 159.4 20wt% Pt 2 Ni/CD-700 50.3
- the HER performance of the reduction catalyst for water electrolysis including the carbon-supported Ni-Mo alloy was 75.1 mV at @ 10 mA cm -2 , indicating the best HER.
- Ni and Co which have high hydrogen adsorption energy
- Mo which are relatively weak
- they have a structure in which H ads are easily desorbed, which promotes the H ads recombination reaction, and it was found that the hydrogen generation effect was excellent.
- alloying Ni and Co, which have high hydrogen adsorption energy the effect of increasing HER performance was not significant.
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Abstract
Description
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Ni | Mo | ||
20wt% Ni5Mo5/C-D-500 | N/A | 7.48 | 12.26 |
20wt% Ni5Mo5/C-D-600 | N/A | 7.37 | 12.31 |
20wt% Ni5Mo5/C-D-700 | 12.5 | 7.11 | 10.96 |
20wt% Ni5Mo5/C-D-800 | 14.8 | 7.54 | 12.18 |
20wt% Ni5Mo5/C-D-900 | 21 | 7.49 | 12.37 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Ni5Mo5/C-D-500 | 287.5 |
20wt% Ni5Mo5/C-D-600 | 173.1 |
20wt% Ni5Mo5/C-D-700 | 104.4 |
20wt% Ni5Mo5/C-D-800 | 122.1 |
20wt% Ni5Mo5/C-D-900 | 107.1 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Ni | Mo | ||
20wt% Ni/C | 10.2 | 19.8 | - |
20wt% Ni7Mo3/C-D-700 | 11.1 | 11.8 | 8.12 |
20wt% Ni5Mo5/C-D-700 | 12.5 | 7.11 | 10.96 |
20wt% Ni4Mo6/C-D-700 | 12 | 5.73 | 14.01 |
20wt% Ni3Mo7/C-D-700 | 12.5 | 4.35 | 15.67 |
20wt% Ni2Mo8/C-D-700 | 12.1 | 2.73 | 17.3 |
20wt% Ni1Mo9/C-D-700 | N/A | 1.05 | 18.68 |
20wt% Mo2C | N/A | - | 20.2 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Ni/C | 231.8 |
20wt% Ni7Mo3/C-D-700 | 123.7 |
20wt% Ni5Mo5/C-D-700 | 104.4 |
20wt% Ni4Mo6/C-D-700 | 88.1 |
20wt% Ni3Mo7/C-D-700 | 75.1 |
20wt% Ni2Mo8/C-D-700 | 154.6 |
20wt% Ni1Mo9/C-D-700 | 170 |
20wt% Mo2C | 160.8 |
20wt% Pt2Ni/C-D-700 | 50.3 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Ni | Mo | ||
20wt% Ni3Mo7/C-D-500 | N/A | 4.15 | 15.33 |
20wt% Ni3Mo7/C-D-600 | N/A | 4.08 | 15.26 |
20wt% Ni3Mo7/C-D-700 | 12.5 | 4.35 | 15.67 |
20wt% Ni3Mo7/C-500 | 10 | 4.21 | 15.5 |
20wt% Ni3Mo7/C-600 | 11 | 4.18 | 15.41 |
20wt% Ni3Mo7/C-700 | 16.8 | 4.12 | 15.29 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Ni3Mo7/C-D-500 | 188.5 |
20wt% Ni3Mo7/C-D-600 | 166.9 |
20wt% Ni3Mo7/C-D-700 | 75.1 |
20wt% Ni3Mo7/C-500 | 213.3 |
20wt% Ni3Mo7/C-600 | 176.2 |
20wt% Ni3Mo7/C-700 | 102 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Ni | Mo | ||
20wt% Ni3Mo7/C-D-700 | 12.5 | 4.35 | 15.67 |
40wt% Ni3Mo7/C-D-700 | 11.8 | 8.28 | 31.15 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
40wt% Pt/C-JM | 42.7 |
20wt% Ni/C | 231.8 |
20wt% Mo2C | 160.8 |
20wt% Ni3Mo7/C-D-700 | 75.1 |
40wt% Ni3Mo7/C-D-700 | 62.6 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Co | Mo | ||
20wt% Co/C | 10.5 | 18.6 | - |
20wt% Co7Mo3/C-D-700 | N/A | 11.3 | 8.2 |
20wt% Co5Mo5/C-D-700 | N/A | 7.6 | 12.2 |
20wt% Co3Mo7/C-D-700 | 11.2 | 4.4 | 16 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Co/C | 300.4 |
20wt% Co7Mo3/C-D-700 | 180.4 |
20wt% Co5Mo5/C-D-700 | 134.6 |
20wt% Co3Mo7/C-D-700 | 152.3 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 입자 크기(nm) | 담지율 (wt%) (ICP-AES) | |
Ni | Co | ||
20wt% Ni/C | 10.2 | 19.8 | - |
20wt% Ni7Co3/C-D-700 | 10.8 | 13.8 | 6.0 |
20wt% Ni5Co5/C-D-700 | 10.7 | 9.7 | 9.9 |
20wt% Ni3Co7/C-D-700 | 11.2 | 6.1 | 13.9 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Ni/C | 231.8 |
20wt% Ni7Co3/C-D-700 | 194.8 |
20wt% Ni5Co5/C-D-700 | 159.4 |
20wt% Ni3Co7/C-D-700 | 174.7 |
촉매 조성, PDA 코팅 여부 및 열처리 온도 | 과전압@10mA·cm-2 (mV) |
20wt% Ni/C | 231.8 |
20wt% Ni3Mo7/C-D-700 | 75.1 |
20wt% Co5Mo5/C-D-700 | 134.6 |
20wt% Ni5Co5/C-D-700 | 159.4 |
20wt% Pt2Ni/C-D-700 | 50.3 |
Claims (15)
- 제1 금속이 탄소 지지체에 담지된 제1 금속-탄소 촉매 전구체를 형성하는 단계;상기 제1 금속-탄소 촉매 전구체를 폴리도파민 (Polydopamine; PDA)으로 코팅시키는 단계;상기 코팅된 제1 금속-탄소 촉매 전구체에 제2 금속을 추가로 담지시켜 제1 금속-제2 금속-탄소 전구체를 형성하는 단계; 및상기 제1 금속-제2 금속-탄소 전구체를 열처리하여 탄소 담지 제1금속-제2금속 합금을 포함하는 수전해용 환원 촉매를 수득하는 단계;를포함하고,상기 제1 금속과 제2 금속은 서로 상이한 전이금속인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 수전해용 환원 촉매에 포함되는 제1금속-제2금속 합금에서 제1금속: 제2금속의 몰비는 7:3 내지 3:7인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 제1 금속 또는 제2 금속은 Ni, Co, Mo, Fe, Sn 및 Cu로 이루어진 군 중에서 각각 독립적으로 선택되는 것인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 제1금속 또는 제2금속의 담지량은 탄소 지지체 중량에 대하여 20 중량% 이상인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 탄소 지지체는 카본블랙, 탄소나노튜브, 탄소나노파이버, 탄소나노코일 및 탄소나노케이지로 이루어지는 군 중에서 선택되는 어느 하나 이상인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 제1 금속-제2 금속-탄소 전구체를 열처리하여 탄소 담지 제1금속-제2금속 합금을 포함하는 수전해용 환원 촉매를 수득하는 단계;에서,열처리 온도는 600 내지 900℃인, 수전해용 환원 촉매의 제조방법.
- 제 1 항에 있어서,상기 제1 금속-제2 금속-탄소 전구체를 열처리하여 탄소 담지 제1금속-제2금속 합금을 포함하는 수전해용 환원 촉매를 수득하는 단계;에서,열처리 분위기는 수소 및 비활성 기체 혼합 분위기인, 수전해용 환원 촉매의 제조방법.
- 제 7 항에 있어서,상기 수소 및 비활성 기체 혼합 분위기는 수소 : 비활성 기체가 10 : 30 내지 50의 부피비로 혼합된 것인, 수전해용 환원 촉매의 제조방법.
- 제 7 항에 있어서,상기 비활성 기체는 아르곤(Ar)인, 수전해용 환원 촉매의 제조방법.
- 탄소 담지 제1금속-제2금속 합금을 포함하고,상기 제1금속과 제2금속은 서로 상이한 전이금속이며,제1금속 : 제2금속의 몰비는 7:3 내지 3:7인, 수전해용 환원 촉매.
- 제10항에 있어서,상기 제1 금속 또는 제2 금속은 Ni, Co, Mo, Fe, Sn 및 Cu로 이루어진 군 중에서 각각 독립적으로 선택되는 것인, 수전해용 환원 촉매.
- 제10항에 있어서,상기 제1금속 또는 제2금속의 담지량은 탄소 중량에 대하여 20 중량% 이상인,수전해용 환원 촉매.
- 제10항에 있어서,상기 탄소에 담지된 제1금속-제2금속 합금의 입자 크기는 10 내지 20 nm인, 수전해용 환원 촉매.
- 금속 집전체; 및상기 금속 집전체 상에 형성되며, 제 1 항의 제조방법에 따라 제조된 수전해용 환원 촉매를 포함하는 촉매층을 포함하는, 알칼라인 수전해용 환원 전극.
- 전해액;산화전극;이온 교환용 격막; 및제 1 항에서 제조된 수전해용 환원 촉매를 포함하는 환원전극을 포함하는, 알칼라인 수전해 시스템.
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KR20200048454A (ko) * | 2018-10-30 | 2020-05-08 | 인하대학교 산학협력단 | 산소환원반응용 니켈-코발트 산화물의 산소결핍의 유도 방법 및 그 방법에 의한 니켈-코발트 산화물 |
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KR20200048454A (ko) * | 2018-10-30 | 2020-05-08 | 인하대학교 산학협력단 | 산소환원반응용 니켈-코발트 산화물의 산소결핍의 유도 방법 및 그 방법에 의한 니켈-코발트 산화물 |
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