CN112768710A - Nano blue diamond catalyst of fuel cell, preparation method and fuel cell - Google Patents
Nano blue diamond catalyst of fuel cell, preparation method and fuel cell Download PDFInfo
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- CN112768710A CN112768710A CN202110027256.1A CN202110027256A CN112768710A CN 112768710 A CN112768710 A CN 112768710A CN 202110027256 A CN202110027256 A CN 202110027256A CN 112768710 A CN112768710 A CN 112768710A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8825—Methods for deposition of the catalytic active composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
- C01B32/26—Preparation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
- C01B32/28—After-treatment, e.g. purification, irradiation, separation or recovery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9091—Unsupported catalytic particles; loose particulate catalytic materials, e.g. in fluidised state
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- 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
- Y02E60/50—Fuel cells
Abstract
The invention provides a nano blue diamond catalyst of a fuel cell and a preparation method thereof, comprising the following steps: s1: converting carbon-containing explosive into diamond by an explosion method to obtain an intermediate product, screening the intermediate product, and separating to obtain nano diamond particles; or growing diamond crystals by a high-temperature high-pressure method or a chemical vapor deposition method, and crushing the diamond crystals into micro-nano-scale particles by a physical means to obtain nano-diamond particles; s2: providing non-conductive diamond as a substrate material, and assembling the nano diamond particles as a raw material on the surface of the substrate material to form a conductive diamond wrapping layer to obtain the nano blue diamond catalyst. S3: and carrying out surface treatment on the nano blue diamond catalyst to make the nano blue diamond catalyst have hydrophobicity or hydrogen absorption.
Description
Technical Field
The invention relates to a nano blue diamond catalyst of a fuel cell, a preparation method and the fuel cell.
Background
A Proton Exchange Membrane Fuel Cell (PEMFC) is a fuel cell, and is equivalent to a reverse device for water electrolysis in principle. The single cell consists of anode, cathode and proton exchange membrane, the anode is the place where hydrogen fuel is oxidized, the cathode is the place where oxidant is reduced, both electrodes contain catalyst for accelerating electrochemical reaction of the electrodes, and the proton exchange membrane is used as electrolyte. When working, the power supply is equivalent to a direct current power supply, the anode of the power supply is the negative pole of the power supply, and the cathode of the power supply is the positive pole of the power supply.
The working process of a fuel cell is actually the reverse process of electrolyzing water, and the basic principle of the fuel cell was proposed as early as 1839 by the british attorney and physicist William-gruff (William Robert Grove), who is the first scientist in the world to achieve the reverse reaction of electrolyzing water and generate electric current. For a half century, fuel cells have received little attention, except for use in special fields such as aerospace. Only in recent decades, fuel cells have been valued and developed with the increased awareness of environmental protection, energy conservation, and protection of limited natural resources.
The PEMFC technology is currently the most mature technology in the world that can oxidize hydrogen and oxygen in the air into clean water and release electric energy:
(1) the hydrogen gas reaches the anode through a pipe or a gas guide plate, and hydrogen molecules are dissociated into positively charged hydrogen ions (i.e., protons) and negatively charged electrons are released under the action of an anode catalyst.
(2) The hydrogen ions pass through the electrolyte (proton exchange membrane) to the cathode; the electrons then reach the cathode through an external circuit. The electrons form a current in an external circuit, which through suitable connections can output electrical energy to a load.
(3) At the other end of the cell, oxygen (or air) passes through a duct or gas guide to the cathode; under the action of cathode catalyst, oxygen reacts with hydrogen ions and electrons to produce water.
The catalysts of the proton exchange membrane fuel cells are basically Pt-based materials at present, mainly Pt/Pd and Pt/Ru alloys are loaded on carbon carriers, because the cathodes of the fuel cells need to release the Pt/Pd and Pt/Ru alloys after water is generated so as to vacate catalytic sites, and if water adheres to the surfaces of the cathodes of the fuel cells, subsequent reactions are influenced, and the working efficiency is reduced. But the global Pt group metal inventory is only 71000 tons. The scarcity and high price of Pt severely limits its commercial applications. And the Pt/C layer is used as a cathode catalyst layer, is easily oxidized in alcohol fuel to cause CO poisoning, so that the Pt/C layer cannot be applied to alcohol fuel cells, and has very important practical significance for the research of non-Pt catalysts.
Disclosure of Invention
In view of the above-mentioned problems, it is necessary to provide a nano blue diamond catalyst for a fuel cell, a method for preparing the same, and a fuel cell using the same.
A preparation method of a nano blue diamond catalyst of a fuel cell comprises the following steps:
S1：
converting carbon-containing explosive into diamond by an explosion method to obtain an intermediate product, screening the intermediate product, and separating to obtain nano diamond particles; or
Growing diamond crystals by a high-temperature high-pressure method or a chemical vapor deposition method, and crushing the diamond crystals into micro-nano-scale particles by a physical means to obtain nano-diamond particles;
S2：
providing non-conductive diamond as a substrate material, and assembling the nano diamond particles as a raw material on the surface of the substrate material to form a conductive diamond wrapping layer to obtain the nano blue diamond catalyst.
S3：
And carrying out surface treatment on the nano blue diamond catalyst to make the nano blue diamond catalyst have hydrophobicity or hydrogen absorption.
In one embodiment, the conductive diamond wrap layer has a thickness of 1-1000 nm.
In one embodiment, in the step S2, the nano-diamond particles are assembled on the substrate material by a hot wire chemical vapor deposition method, wherein the parameters of the hot wire chemical vapor deposition method include a base temperature of 500-.
In one embodiment, in the S2 step, the nano-diamond particles are assembled on the base material by a microwave plasma chemical vapor deposition method, and the parameters of the microwave plasma chemical vapor deposition method are as follows: the microwave power is 500-3000W, the hydrogen is 100-1000sccm, the methane is 1-20sccm, the borane is 1-10sccm, the substrate temperature is 500-700 ℃, the gas pressure is 4-6kPa, and the growth time is 3-10 h.
In one embodiment, the step S3 includes: and (4) closing the carbon source and the boron source, keeping other parameters in the step S2 unchanged, and reacting for 1-30 minutes under the condition of introducing hydrogen to form C-H bonds on the surface of the nano blue diamond catalyst.
In one embodiment, the step S3 includes: and (2) treating the nano blue diamond catalyst for 1 hour by adopting concentrated sulfuric acid with the concentration of 98% at the temperature of 80 ℃ to form ether bonds or aldehyde groups on the surface of the nano blue diamond catalyst.
In one embodiment, the step S3 includes: soaking the nano blue diamond catalyst in 30-50% hydrogen peroxide solution, and irradiating with 254nm ultraviolet for 1 hr to form hydroxyl on the surface of the nano blue diamond catalyst.
In one embodiment, in the step S1, the nano-diamond particles are sorted out by removing impurities in the intermediate product through acid washing oxidation.
The nano blue diamond catalyst for the fuel cell is prepared by using the preparation method of the nano blue diamond catalyst for the fuel cell.
A fuel cell comprising an anode and a cathode, the anode and/or cathode using a nano blue diamond catalyst as described in any one of the above.
The invention has the beneficial effects that:
(1) the nano blue diamond catalyst is in a structure that the outer layer is formed by wrapping nano conductive diamond particles and the inner core is non-conductive diamond particles, so that the nano conductive diamond particles participating in the reaction have a huge effective reaction area, and the reaction efficiency is improved.
(2) The nano blue diamond catalyst is subjected to surface treatment, has the performance of hydrogen adsorption or hydrophobicity, can be respectively applied to an anode catalyst and a cathode catalyst of a fuel cell, and improves the overall efficiency of the fuel cell.
(3) The raw material of the nano blue diamond catalyst is diamond, the diamond can be artificially synthesized, and compared with platinum, the nano blue diamond catalyst is rare, can be used as a raw material for mass production and is easier to obtain. And the price is lower than that of platinum, and the fuel cell can be commercially applied in a large scale, so that the popularization and the application of the fuel cell are more possible.
(4) The conductive diamond has better mechanical strength, thermal conductivity, electrochemistry and chemical properties than platinum, and is more suitable for being used as a catalyst of a fuel cell.
(5) The nano blue diamond catalyst is applied to the fuel cell, the chemical reaction is safer, the problem of toxic CO generated by using platinum as the catalyst is avoided, and the nano blue diamond catalyst is safer and more environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a SEM image of a nano-diamond catalyst.
FIG. 2 is another SEM image of the nano-blue diamond catalyst.
FIG. 3 is another SEM image of the nano-blue diamond catalyst.
FIG. 4 is a Fourier transform infrared spectrum of the nano-diamond catalyst after surface treatment in one embodiment.
Fig. 5 is a schematic structural view of a fuel cell using a nano-blue diamond catalyst.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a nano blue diamond catalyst of a fuel cell and a preparation method thereof, wherein the nano blue diamond catalyst is in a structure that an outer conductive diamond wrapping layer wraps an inner core and is a non-conductive diamond, and the nano blue diamond catalyst is prepared by the preparation method of the nano blue diamond catalyst of the fuel cell, and comprises the following steps:
step S1:
one method of obtaining nanodiamond particles is provided, example 01:
converting carbon-containing explosive into diamond by an explosion method to obtain an intermediate product, screening the intermediate product, and separating to obtain the nano diamond particles.
The principle of converting diamond into diamond by an explosion method is as follows: using carbon-containing explosive with negative oxygen balance as raw material, and in detonation, the oxygen in explosive molecule is not enough to oxidize all carbon into CO or CO2Therefore, free carbon exists in the detonation zone, and the free carbon is partially converted into diamond under the action of high pressure and high temperature of the detonation zone. The product of the method not only comprises diamond, but also comprises impurities such as graphite, amorphous carbon and the like, and the product needs to be screened and separated in order to obtain the required diamond powder. The diameter of the isolated nano-diamond particles is less than 20nm, and in the preferred embodiment of the present invention, nano-diamond particles with a particle diameter of less than 10nm are screened.
In one embodiment, in the step S1, the nano-diamond particles are sorted out by removing impurities in the intermediate product through acid washing oxidation. For example, by subjecting the graphite to boiling heat treatment with concentrated sulfuric acid or concentrated nitric acid, impurities such as graphite and most of amorphous carbon can be removed.
Alternatively, another method of obtaining nanodiamond particles is provided, example 02:
growing diamond crystals by a high-temperature high-pressure method or a chemical vapor deposition method, and crushing the diamond crystals into micro-nano-grade particles by a physical means to obtain the nano-diamond particles.
The high temperature and high pressure method is to convert carbon sources such as graphite into diamond under high temperature and high pressure by using a catalyst, and the chemical vapor deposition method includes a hot wire method, a microwave method and the like, in which a mixture of carbon-containing gas and hydrogen is introduced into a vacuum chamber, and the carbon-containing gas and hydrogen are excited to dissociate under the conditions of high temperature and pressure lower than the standard atmospheric pressure, thereby generating diamond.
Large diamond crystals grow by a high-temperature high-pressure method or a chemical vapor deposition method, and the grown large diamond crystals are crushed into micro-nano-scale particles by physical means such as crushing, grinding and the like.
For example, the catalyst/graphite/boron source is used to prepare conductive diamond particles by an oil press under the conditions of high temperature and high pressure (more than 500 ℃ and more than 10GPa) by adopting a high-temperature high-pressure method, and then the conductive diamond particles are scattered and smashed by a physical means to obtain small conductive diamond particles; or directly preparing conductive diamond particles by a high-temperature high-pressure (more than 500 ℃ and more than 10GPa) method, wherein the particle size of the obtained diamond particles is 1nm-1 μm. In a preferred embodiment of the present invention, it is pulverized into nanodiamond particles having a particle diameter of less than 15 nm.
The nano-diamond particles can also be obtained by commercial purchase, and the particles with the diameter less than 15nm are taken for subsequent treatment process.
Step S2: providing non-conductive diamond as a substrate material, and assembling the nano diamond particles as a raw material on the surface of the substrate material to form a conductive diamond wrapping layer to obtain the nano blue diamond catalyst.
The nano diamond particles are assembled on the surface of the substrate material by taking the nano diamond particles as raw materials, for example, the substrate material is common IIb type diamond particles which are not conductive per se, the particle diameter is 1nm-1mm, preferably 4nm-1 mu m, the nano diamond particles are converted into the nano conductive diamond particles in the assembling process, the nano conductive diamond particles on the outer side are conductive diamond coating layers, a structure that the nano conductive diamond particles coat the outer layer and the inner core is non-conductive diamond is formed, and the structure is the nano blue diamond catalyst.
To achieve assembly, in one embodiment, the S2 step, in which the nanodiamond particles are assembled on the base material by hot wire chemical vapor deposition, is deposited to form a conductive nanodiamond wrapping layer, and specifically, the S2 step includes: cleaning the non-conductive diamond substrate by using hydrogen peroxide, nitric acid, pure water, alcohol and the like, drying, and then putting the non-conductive diamond substrate into hot wire chemical vapor deposition equipment for growth, wherein the growth conditions are as follows: the parameters of the hot wire chemical vapor deposition method are that the temperature of the base station is 500-800 ℃, the temperature of the hot wire is 180-2400 ℃, the air pressure is 1-5kPa, 100 sccm of hydrogen is introduced, 1-20sccm of methane and 1-20sccm of borane are introduced, and the growth is carried out for more than 10 min. The thickness of the formed nano conductive diamond coating layer is 1nm-10 mu m, and the thicker the growth size is, the longer the reaction time is.
To accomplish the assembly, in another embodiment, the S2 step, in which the nanodiamond particles are assembled on the base material by microwave plasma chemical vapor deposition to form a conductive nanodiamond wrapping layer, specifically, the S2 step includes: cleaning the non-conductive diamond substrate by using hydrogen peroxide, nitric acid, pure water, alcohol and the like, drying the non-conductive diamond substrate, and then putting the non-conductive diamond substrate into microwave chemical vapor deposition equipment for growth, wherein the parameters of the microwave plasma chemical vapor deposition method are as follows: the microwave power is 500-3000W, the hydrogen is 100-1000sccm, the methane is 1-20sccm, the borane is 1-10sccm, the substrate temperature is 500-700 ℃, the gas pressure is 4-6kPa, and the growth time is 3-10 h. The thickness of the formed nano conductive diamond coating layer is 1nm-10 mu m, and the thicker the growth size is, the longer the reaction time is.
In a preferred embodiment, the thickness of the conductive diamond wrap layer formed in step S2 is 1nm to 1000 nm.
Step S3: and carrying out surface treatment on the nano blue diamond catalyst to make the nano blue diamond catalyst have hydrophobicity or hydrogen absorption.
As an innovation of the invention, the surface of the prepared nano blue diamond catalyst is modified, and after the surface of the nano blue diamond catalyst is treated, the nano blue diamond catalyst with hydrophobicity can be used as a cathode of a fuel cell, and the nano blue diamond catalyst with hydrogen absorbability (namely the performance of absorbing hydrogen) can be used as an anode of the fuel cell.
To make the nano blue diamond catalyst hydrogen absorbing, example 03 is provided:
the step S3 includes: and (2) treating the nano blue diamond catalyst for 1 hour at 80 ℃ by adopting concentrated sulfuric acid with the concentration of 98% to form ether bonds, aldehyde groups or ketone groups on the surface of the nano blue diamond catalyst.
To make the nano blue diamond catalyst hydrogen absorbing, example 04 is provided:
the step S3 includes: soaking the nano blue diamond catalyst in 30-50% hydrogen peroxide solution, and irradiating with 254nm ultraviolet for 1 hr to form hydroxyl on the surface of the nano blue diamond catalyst.
To make the nano-blue diamond catalyst hydrophobic, example 05 was provided:
the step S3 includes: turning off the carbon source and the boron source, keeping other parameters in step S2 unchanged, and reacting for 1-30 minutes under the condition of introducing hydrogen, that is, specifically, placing into a chemical vapor deposition apparatus, and continuously introducing hydrogen, wherein the specific parameters refer to the above examples. Thereby forming C-H bonds on the surface of the nano blue diamond catalyst.
FIG. 4 is a Fourier transform infrared spectrum of diffuse reflection on nano-diamond catalyst after surface treatment, wherein (1) is nano-diamond catalyst with hydrophobicity (C-H bond) and (2) is nano-diamond catalyst with hydrogen absorption after surface oxidation treatment.
Through the method, the surface of the nano blue diamond catalyst is modified to have the performance of adsorbing hydrogen or dewatering, and the nano blue diamond catalyst can be respectively applied to an anode catalyst and a cathode catalyst of a fuel cell.
The proton exchange membrane fuel cell comprises an anode, a proton exchange membrane and a cathode, wherein the anode is a hydrogen electrode, the cathode is an oxygen electrode, introduced hydrogen reaches the anode and is decomposed into hydrogen ions with positive charges, electrons with negative charges are released, the hydrogen ions pass through the proton exchange membrane to reach the cathode, the electrons reach the cathode through an external circuit, the electrons form current in the external circuit, and electric energy can be output to a load through proper connection. At the other end, the introduced oxygen (or air) reaches the cathode, and the oxygen reacts with the hydrogen ions and electrons to generate water.
Therefore, through the surface treatment, the hydrogen absorption nano blue diamond catalyst applied to the anode catalyst can accelerate the decomposition of hydrogen into hydrogen ions and accelerate the transfer of the hydrogen ions to the cathode, while the hydrophobic nano blue diamond catalyst applied to the cathode catalyst can accelerate the decomposition of hydrogen into hydrogen ions because water is generated on the surface of the cathode catalyst, if the water is adhered to the surface of the catalyst, the subsequent hydrogen ions can not contact the surface of the catalyst to continue the reaction, so that the efficiency of the electrolytic cell is greatly reduced, the water can be quickly transferred and taken away through the surface treatment, the oxygen can efficiently contact the catalyst to react, and the hydrogen is continuously decomposed and transferred, so that the overall efficiency of the fuel cell is improved.
The invention provides scanning electron microscope SEM images of a nano blue diamond catalyst, which are shown in figures 1-3 for reference.
The beneficial effects created by the invention are as follows:
(1) the nano blue diamond catalyst is in a structure that the outer layer is formed by wrapping nano conductive diamond particles and the inner core is non-conductive diamond particles, so that the nano conductive diamond particles participating in the reaction have a huge effective reaction area, and the reaction efficiency is improved.
(2) The nano blue diamond catalyst is subjected to surface treatment, has the performance of hydrogen adsorption or hydrophobicity, can be respectively applied to an anode catalyst and a cathode catalyst of a fuel cell, and improves the overall efficiency of the fuel cell.
(3) The raw material of the nano blue diamond catalyst is diamond, the diamond can be artificially synthesized, and compared with platinum, the nano blue diamond catalyst is rare, can be used as a raw material for mass production and is easier to obtain. And the price is lower than that of platinum, and the fuel cell can be commercially applied in a large scale, so that the popularization and the application of the fuel cell are more possible.
(4) The conductive diamond has better mechanical strength, thermal conductivity, electrochemistry and chemical properties than platinum, and is more suitable for being used as a catalyst of a fuel cell.
(5) The nano blue diamond catalyst is applied to the fuel cell, the chemical reaction is safer, the problem of toxic CO generated by using platinum as the catalyst is avoided, and the nano blue diamond catalyst is safer and more environment-friendly.
The invention provides a fuel cell, which comprises an anode and a cathode, wherein the anode and/or the cathode use the nano blue diamond catalyst.
Example 06
A fuel cell, as shown in figure 5. The surface treated nano blue diamond catalyst with hydrogen absorption is used as an anode catalyst, the nano blue diamond catalyst with hydrophobicity is used as a cathode catalyst, and a proton exchange membrane is arranged between the anode catalyst and the cathode catalyst. When H is present2And O2After respectively reaching the anode and the cathode of the cell through the gas guide channels, hydrogen is dissociated into H + and e under the action of an anode catalyst-，H+In the form of hydrated protons, the hydrated protons are transferred in the proton exchange membrane and finally reach the cathode, so that the proton conduction is realized. H+The transfer of (b) causes a negatively charged electron accumulation at the anode, which becomes a negatively charged terminal (negative). At the same time, O of the cathode2H coming from anode under the action of catalyst+The combination causes the cathode to become a positively charged terminal (positive electrode) with the result that a voltage is developed between the negative terminal of the anode and the positive terminal of the cathode. The electrodes are connected by an external load circuit, and electrons flow from the anode to the cathode through a circuit to form a fuel cell, thereby generating electric energy.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a nano blue diamond catalyst of a fuel cell is characterized by comprising the following steps:
S1：
converting carbon-containing explosive into diamond by an explosion method to obtain an intermediate product, screening the intermediate product, and separating to obtain nano diamond particles; or
Growing diamond crystals by a high-temperature high-pressure method or a chemical vapor deposition method, and crushing the diamond crystals into micro-nano-scale particles by a physical means to obtain nano-diamond particles;
S2：
providing non-conductive diamond as a substrate material, and assembling the nano diamond particles as a raw material on the surface of the substrate material to form a conductive diamond wrapping layer to obtain a nano blue diamond catalyst;
S3：
and carrying out surface treatment on the nano blue diamond catalyst to make the nano blue diamond catalyst have hydrophobicity or hydrogen absorption.
2. The method of preparing a nano blue diamond catalyst for a fuel cell according to claim 1, wherein the thickness of the conductive diamond wrap is 1 to 1000 nm.
3. The method as claimed in claim 1, wherein in the step S2, the nano-diamond particles are assembled on the substrate material by a hot wire chemical vapor deposition method, wherein the parameters of the hot wire chemical vapor deposition method include a base temperature of 500-.
4. The method of preparing a nano blue diamond catalyst for a fuel cell according to claim 1, wherein in the step S2, the nano diamond particles are assembled on the base material by a microwave plasma chemical vapor deposition method, and the parameters of the microwave plasma chemical vapor deposition method are as follows: the microwave power is 500-3000W, the hydrogen is 100-1000sccm, the methane is 1-20sccm, the borane is 1-10sccm, the substrate temperature is 500-700 ℃, the gas pressure is 4-6kPa, and the growth time is 3-10 h.
5. The method for preparing a nano blue diamond catalyst for a fuel cell according to claim 3 or 4, wherein the step S3 includes: and (4) closing the carbon source and the boron source, keeping other parameters in the step S2 unchanged, and reacting for 1-30 minutes under the condition of introducing hydrogen to form C-H bonds on the surface of the nano blue diamond catalyst.
6. The method for preparing a nano blue diamond catalyst for a fuel cell according to claim 1, wherein the step S3 includes: and (2) treating the nano blue diamond catalyst for 1 hour by adopting concentrated sulfuric acid with the concentration of 98% at the temperature of 80 ℃ to form ether bonds or aldehyde groups on the surface of the nano blue diamond catalyst.
7. The method for preparing a nano blue diamond catalyst for a fuel cell according to claim 1, wherein the step S3 includes: soaking the nano blue diamond catalyst in 30-50% hydrogen peroxide solution, and irradiating with 254nm ultraviolet for 1 hr to form hydroxyl on the surface of the nano blue diamond catalyst.
8. The method of preparing a nano blue diamond catalyst for a fuel cell according to claim 1, wherein the nano diamond particles are separated by removing impurities from the intermediate product by acid washing oxidation in step S1.
9. A nano blue diamond catalyst for a fuel cell, which is prepared by using the method for preparing a nano blue diamond catalyst for a fuel cell according to any one of claims 1 to 8.
10. A fuel cell comprising an anode and a cathode, wherein the anode and/or the cathode uses the nano blue diamond catalyst according to any one of claims 1 to 8.
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| US11590568B2 (en) | 2019-12-19 | 2023-02-28 | 6K Inc. | Process for producing spheroidized powder from feedstock materials |
| US11633785B2 (en) | 2019-04-30 | 2023-04-25 | 6K Inc. | Mechanically alloyed powder feedstock |
| US11717886B2 (en) | 2019-11-18 | 2023-08-08 | 6K Inc. | Unique feedstocks for spherical powders and methods of manufacturing |
| US11839919B2 (en) | 2015-12-16 | 2023-12-12 | 6K Inc. | Spheroidal dehydrogenated metals and metal alloy particles |
| US11855278B2 (en) | 2020-06-25 | 2023-12-26 | 6K, Inc. | Microcomposite alloy structure |
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| US11855278B2 (en) | 2020-06-25 | 2023-12-26 | 6K, Inc. | Microcomposite alloy structure |
| US11963287B2 (en) | 2020-09-24 | 2024-04-16 | 6K Inc. | Systems, devices, and methods for starting plasma |
| US11919071B2 (en) | 2020-10-30 | 2024-03-05 | 6K Inc. | Systems and methods for synthesis of spheroidized metal powders |
| CN114874025A (en) * | 2022-03-28 | 2022-08-09 | 广州德百顺蓝钻科技有限公司 | Diamond water filtering ring and preparation method thereof |
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| CN112768710B (en) | 2022-04-29 |
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