CN112264062A - Preparation and application of monatomic platinum catalyst based on MXene quantum dots - Google Patents
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000003054 catalyst Substances 0.000 title claims abstract description 46
- 239000002096 quantum dot Substances 0.000 title claims abstract description 35
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 8
- 238000001354 calcination Methods 0.000 claims abstract description 7
- 238000004108 freeze drying Methods 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 229910009819 Ti3C2 Inorganic materials 0.000 claims description 6
- 229910009818 Ti3AlC2 Inorganic materials 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical group [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 4
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Chemical compound [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 2
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 2
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 2
- 238000010335 hydrothermal treatment Methods 0.000 claims description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 238000011056 performance test Methods 0.000 claims description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- RMLYXMMBIZLGAQ-UHFFFAOYSA-N (-)-monatin Natural products C1=CC=C2C(CC(O)(CC(N)C(O)=O)C(O)=O)=CNC2=C1 RMLYXMMBIZLGAQ-UHFFFAOYSA-N 0.000 claims 1
- RMLYXMMBIZLGAQ-HZMBPMFUSA-N (2s,4s)-4-amino-2-hydroxy-2-(1h-indol-3-ylmethyl)pentanedioic acid Chemical compound C1=CC=C2C(C[C@](O)(C[C@H](N)C(O)=O)C(O)=O)=CNC2=C1 RMLYXMMBIZLGAQ-HZMBPMFUSA-N 0.000 claims 1
- 238000011068 loading method Methods 0.000 claims 1
- 238000002604 ultrasonography Methods 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 11
- 238000006722 reduction reaction Methods 0.000 abstract description 10
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 229910021529 ammonia Inorganic materials 0.000 abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000969 carrier Substances 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000009620 Haber process Methods 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- -1 transition metal carbides Chemical class 0.000 description 1
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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/20—Carbon compounds
- B01J27/22—Carbides
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- B01J35/33—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- 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
Abstract
Preparation and application of a monatomic platinum catalyst based on MXene quantum dots the invention provides preparation and application of a monatomic platinum catalyst based on MXene quantum dots. MXene quantum dots are used as carriers, and a certain amount of chloroplatinic acid and molten salt are added to obtain a mixtureAnd (3) solution. Stirring the mixed solution, freeze-drying, calcining the obtained solid powder at high temperature under the protection of inert atmosphere, and then carrying out acid washing, washing and drying to obtain the novel monatomic platinum catalyst taking MXene quantum dots as carriers. The catalyst has high catalytic activity on electrocatalytic nitrogen reduction reaction, and the yield of ammonia under-0.2V (relative to a standard hydrogen electrode) is as high as 80.3 mu g h–1 mg–1 catFaradaic efficiency of 7.3% is a potential electrocatalytic nitrogen reduction catalyst material.
Description
Technical Field
The invention relates to preparation and application of a monatomic platinum catalyst based on MXene quantum dots, and belongs to the technical field of monatomic electrocatalysis.
Background
With the growth of population and the continuous consumption of fossil fuels, the development of green energy sources and energy storage materials becomes a major challenge for social development. Ammonia acts as a high energy density carrier, allowing for the efficient collection, storage and transportation of renewable energy sources without the release of greenhouse gases. At present, the main method for producing ammonia gas is a haber process, and the process needs high temperature and high pressure, and has high energy consumption and serious pollution. Therefore, the reduction of nitrogen to ammonia at ambient conditions is an attractive technique.
Electrocatalytic nitrogen reduction reaction driven by renewable energy has gained wide attention due to simple manufacture and mild reaction conditions. However, the electrocatalytic nitrogen reduction ammonia production process presents a significant challenge to its commercial production due to low yields and the concomitant competitive hydrogen evolution reactions. The search for suitable catalysts to increase ammonia production has become an important research subject for electrocatalytic nitrogen reduction.
The literature reports that the single-atom catalyst refers to a catalyst formed by uniformly distributing single atoms on a carrier, and is proposed for the first time in 2011. Compared with the traditional catalyst, the strong interaction between the metal monoatomic atoms in the monatomic catalyst and the substrate can bring about the optimized reforming of the electronic structure and promote the electron transfer. The intrinsic activity of the monatomic catalyst is very high, and more metal sites of the monatomic catalyst are exposed on the surface, so that the atom utilization rate of the monatomic catalyst can be improved, and the high catalytic activity is obtained; the monoatomic configuration shows significantly higher stability in catalytic reactions than other catalysts. However, due to high surface energy and thermodynamic instability of the monatomic catalyst, how to further improve the load of the monatomic catalyst and prevent monatomic agglomeration can further maximize the metal utilization rate and improve the catalytic activity, so that MXenes which are needed to be solved urgently by the monatomic catalyst are novel two-dimensional transition metal carbides, nitrides or carbonitrides, and have the advantages of high specific surface area and high conductivity. MXenes materials with lateral dimensions less than 10 nm are called MXene Quantum Dots (MQDs). Due to the quantum confinement effect, MQDs always keep the inherent advantages of MXenes, and have more novel physical and chemical properties, so that the MQDs have potential application prospects in the field of catalysis.
Disclosure of Invention
The invention aims to provide preparation and application of a single-atom platinum catalyst based on MXene quantum dots, and the catalyst has high catalytic activity on nitrogen reduction reaction.
The technical scheme of the invention is as follows:
the preparation and application of the MXene quantum dot-based monatomic platinum catalyst comprise the following steps: (1) mixing Ti3AlC2Dispersing the powder in 10 ml of 48% HF acid solution, stirring, centrifuging and washing the dispersion for multiple times, and drying to obtain multilayer Ti3C2MXene powder; (2) under the protection of inert gas, multiple layers of Ti3C2MXene is dispersed into deionized water by ultrasonic, the pH value is adjusted to 9 by ammonia water, the mixture is transferred to a high-pressure kettle for hydrothermal reaction, and then the mixture is filtered and precipitated by a 220 nm filter membrane and dialyzed to obtain MXene quantum dots; (3) the preparation concentration is 15-25 mg-1Adding chloroplatinic acid and molten salt to obtain a mixed solution, stirring, and freeze-drying to obtain solid powder; (4) calcining the solid powder for 1-5 h at the temperature of 400-800 ℃ under the protection of inert gas, pickling, washing with water, and drying to finally obtain the novel monatomic platinum catalyst.
Preparation and application of a single atom platinum catalyst based on MXene quantum dots, wherein in the step (1), Ti3AlC2The powder was 0.5 g; stirring for 24 h at room temperature; centrifuging and washing for multiple times, wherein the centrifuging condition is 3500 rpm for 10 min; and washing the pH value of the dispersion liquid to 5-6 by using deionized water, wherein the drying condition is 12 hours at 80 ℃.
Preparing and applying a monatomic platinum catalyst based on MXene quantum dots, wherein in the step (2), deionized water is 20 ml, and ultrasonic treatment is performed for 1 hour; the hydrothermal treatment condition is 6 hours at 100 ℃; dialyzed against deionized water for 48 h.
Preparation and application of a monatomic platinum catalyst based on MXene quantum dots, wherein in the step (3), the concentration of chloroplatinic acid is 0.1 mol-1The mass ratio of chloroplatinic acid to MQDs is 0.05-0.25: 1; MXeneThe mass ratio of the total mass of the quantum dots and the chloroplatinic acid to the molten salt is 1: 10-50; the molten salt is selected from LiCl/KCl, NaCl/KCl, and Li2SO4 /K2SO4And Li2CO3 /K2CO3(ii) a Stirring for 5-15 h; and (5) freeze-drying for 36-48 h.
Preparation and application of a monatomic platinum catalyst based on MXene quantum dots, wherein in the step (4), the inert gas is argon or nitrogen; the temperature rise rate of the calcination temperature is 5-10 ℃/min.
Preparing and applying a monatomic platinum catalyst based on MXene quantum dots, wherein in the step (4), the monatomic platinum catalyst is washed by 0.5-2.5 mol/L sulfuric acid, hydrochloric acid or nitric acid, and the washing time is 5-15 hours; washing with water until the solution pH = 7; drying for 10-15 h at 60-120 ℃ under vacuum condition.
The preparation method is characterized in that the monatomic platinum catalyst is ground by adding ethanol, and the obtained dispersion liquid is uniformly dripped on a glassy carbon electrode to obtain a working electrode; the electrocatalytic nitrogen reduction performance test was performed on an electrochemical workstation with a three-electrode system.
Detailed Description
The following examples further illustrate the invention, but the invention is not limited to these examples.
Example 1
The first step is as follows: 0.5 g of Ti3AlC2The powder was dispersed in 10 ml of 48% HF acid solution and stirred at room temperature for 24 hours for etching. And then repeatedly centrifuging and washing the obtained dispersion liquid for several times by using deionized water, wherein the centrifugation condition is 3500 rpm for 10 min until the pH value of the dispersion liquid reaches 5-6, thoroughly removing residual HF and impurities, and drying at 80 ℃ for 12 h to obtain multilayer Ti3C2MXene powder.
The second step is that: under the protection of inert gas, multiple layers of Ti3C2Ultrasonic dispersing MXene into 20 ml deionized water, adjusting pH of the mixed solution to 9 with ammonia water, transferring the mixed solution into a 75 ml autoclave, reacting at 100 ℃ for 6 h, filtering and precipitating with a 220 nm filter membrane, and dialyzing in deionized water for 48 h to obtain MXene quantum dots。
The third step: 20 mg.mL of the extract-1MXene quantum dot water solution is put into a beaker, and then 0.1 mol.L is slowly added-1And a quantity of molten salt; stirring the mixture evenly for 5 to 15 hours at room temperature. And then, putting the mixture into a refrigerator for freezing for 5-15 h, and then carrying out freeze drying for 36-48 h to obtain solid powder.
The fourth step: calcining the solid powder at 500 ℃ for 3 h under the protection of argon, wherein the heating rate is 5-10 ℃/min, and cooling to room temperature; pickling the obtained solid with 2 mol/L sulfuric acid, hydrochloric acid or nitric acid for 5-15 h, washing the pickled sample with deionized water until the pH value is =7, and drying the sample in a vacuum drying oven at 60-120 ℃ for 10-15 h; a homogeneously dispersed monatomic platinum catalyst was obtained.
The fifth step: grinding 4 mg of a single-atom platinum catalyst and 950 mu L of ethanol by using a mortar, adding 40 mu L of Nafion, and carrying out ultrasonic treatment for 1 h to obtain a uniform dispersion liquid; taking 20 mu L of the dispersion liquid, dripping the dispersion liquid on the surface of clean and dry carbon paper, and naturally airing the carbon paper to be used as a working electrode; a three-electrode standard system is adopted, electrolyte is 0.1 mol/L sodium sulfate solution, an H-shaped glass electrolytic cell is used as a reaction device to test the stability, the durability and the NH of the catalytic activity of the nitrogen reduction reaction3Yield and faradic efficiency.
Example 2
Except that the solid obtained was not subjected to acid washing in the fourth step instead of acid washing as described in example 1, an ungraded MXene quantum dot-based metal platinum particle catalyst was obtained.
Example 3
As described in example 1, except that the concentration of the MXene quantum dot solution in the third step was 20 mg-1The concentration of MXene quantum dot solution is 25 mg-1Instead.
Example 4
As in example 1, except that in the fourth step the solid powder was calcined at 500 ℃ for 3 h and replaced by calcining the solid powder at 700 ℃ for 2 h.
The invention takes MXene quantum dots as a carrier to prepare the monatomic platinum catalyst, and the transport of substances in the nitrogen reduction reaction process is promoted due to the quantum confinement effect. The MXene quantum dots contain a large number of surface functional groups and surface defects, and are stably combined with metal atoms through strong metal-carrier interaction, so that the catalytic activity and the stability are improved. The single-atom platinum catalyst based on MXene quantum dots provided by the invention provides a new idea for electrocatalysis of nitrogen fixation.
Claims (7)
1. The preparation and application of the MXene quantum dot-based monatomic platinum catalyst are characterized by comprising the following steps: (1) a certain amount of Ti3AlC2Dispersing the powder into 10 ml of 48% HF solution for etching, after the reaction is finished, centrifugally washing the dispersion for multiple times until the pH value is 5-6, and drying to obtain a multilayer Ti3C2MXene powder; (2) under the protection of inert gas, multiple layers of Ti3C2MXene is dispersed into deionized water by ultrasonic, the pH value of the solution is adjusted to 9 by ammonia water, the solution is transferred to a high-pressure kettle for hydrothermal reaction, and then the solution is filtered by a filter membrane of 220 nm and is dialyzed to obtain MXene quantum dots; (3) the preparation concentration is 15-25 mg/mL-1Adding chloroplatinic acid and molten salt to obtain a mixed solution, stirring, and freeze-drying to obtain solid powder; (4) calcining the solid powder for 1-5 h at the temperature of 400-800 ℃ under the protection of inert gas, pickling, washing with water, and drying to finally obtain the novel monatomic platinum catalyst.
2. The preparation and application of the MXene quantum dot-based monatomic platinum catalyst of claim 1, wherein in step (1), Ti3AlC2The powder was 0.5 g; stirring for 24 h at room temperature; centrifuging and washing for multiple times, wherein the centrifuging condition is 3500 rpm for 10 min; and washing the pH value of the dispersion liquid to 5-6 by using deionized water, wherein the drying condition is 12 hours at 80 ℃.
3. The preparation and application of the MXene quantum dot-based monatomic platinum catalyst of claim 1, wherein in the step (2), deionized water is 20 ml, and ultrasound is performed for 1 h; the hydrothermal treatment condition is 6 hours at 100 ℃; dialyzed against deionized water for 48 h.
4. The preparation and application of the MXene quantum dot-based monatin platinum catalyst of claim 1, wherein in the step (3), the concentration of chloroplatinic acid is 0.1 mol-L-1The mass ratio of the chloroplatinic acid to the MXene quantum dots is 0.05-0.25: 1; the mass ratio of the total mass of the MXene quantum dots and the chloroplatinic acid to the molten salt is 1: 10-50; the molten salt is selected from LiCl/KCl, NaCl/KCl, and Li2SO4 /K2SO4And Li2CO3 /K2CO3(ii) a Stirring for 5-15 h; and (5) freeze-drying for 36-48 h.
5. The preparation and application of the MXene quantum dot-based monatomic platinum catalyst of claim 1, wherein in step (4), the inert gas is argon or nitrogen; the temperature rise rate of the calcination temperature is 5-10 ℃/min.
6. The preparation and application of the MXene quantum dot-based monatomic platinum catalyst of claim 1, wherein in the step (4), the acid is washed with 0.5-2.5 mol/L sulfuric acid, hydrochloric acid or nitric acid for 5-15 h; wash with water until solution pH = 7; vacuum drying at 60-120 ℃ for 10-15 h.
7. The preparation method and application of the MXene quantum dot-based monatomic platinum catalyst are characterized in that the monatomic platinum catalyst is ground by adding ethanol, the obtained dispersion liquid is uniformly dripped on a glassy carbon electrode, and after the surface of the electrode is completely air-dried, a working electrode is obtained, wherein the loading capacity of the monatomic platinum catalyst is 0.05-0.25 mg-cm-2(ii) a The electrocatalytic nitrogen reduction performance test was performed on an electrochemical workstation with a three-electrode system.
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Cited By (7)
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| CN113437318A (en) * | 2021-06-25 | 2021-09-24 | 北京大学 | Carbon-loaded noble metal alloy nanoparticle and preparation method and application thereof |
| CN113481528A (en) * | 2021-07-05 | 2021-10-08 | 哈尔滨工业大学（深圳） | Composite catalyst and preparation method and application thereof |
| CN113584524A (en) * | 2021-08-09 | 2021-11-02 | 辽宁大学 | Novel porous Fe-Ti3C2ClxMethod for producing materials and use thereof |
| CN114318369A (en) * | 2022-01-07 | 2022-04-12 | 河北工业大学 | Preparation method and application of MXene quantum dot supported phthalocyanine molecule composite catalyst |
| CN114551956A (en) * | 2022-03-22 | 2022-05-27 | 中海储能科技(北京)有限公司 | Preparation method of electrolyte of iron-chromium flow battery and electrolyte obtained by preparation method |
| CN114752947A (en) * | 2022-04-02 | 2022-07-15 | 上海升水新能源科技有限公司 | Preparation method of high-activity and high-stability supported oxygen evolution catalyst |
| CN114883561A (en) * | 2022-04-18 | 2022-08-09 | 北京理工大学 | Two-dimensional transition metal monatomic catalyst and preparation method and application thereof |
Citations (3)
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| CN113437318A (en) * | 2021-06-25 | 2021-09-24 | 北京大学 | Carbon-loaded noble metal alloy nanoparticle and preparation method and application thereof |
| CN113481528A (en) * | 2021-07-05 | 2021-10-08 | 哈尔滨工业大学（深圳） | Composite catalyst and preparation method and application thereof |
| CN113584524A (en) * | 2021-08-09 | 2021-11-02 | 辽宁大学 | Novel porous Fe-Ti3C2ClxMethod for producing materials and use thereof |
| CN114318369A (en) * | 2022-01-07 | 2022-04-12 | 河北工业大学 | Preparation method and application of MXene quantum dot supported phthalocyanine molecule composite catalyst |
| CN114551956A (en) * | 2022-03-22 | 2022-05-27 | 中海储能科技(北京)有限公司 | Preparation method of electrolyte of iron-chromium flow battery and electrolyte obtained by preparation method |
| CN114752947A (en) * | 2022-04-02 | 2022-07-15 | 上海升水新能源科技有限公司 | Preparation method of high-activity and high-stability supported oxygen evolution catalyst |
| CN114752947B (en) * | 2022-04-02 | 2024-03-08 | 上海升水新能源科技有限公司 | Preparation method of high-activity and stability supported oxygen evolution catalyst |
| CN114883561A (en) * | 2022-04-18 | 2022-08-09 | 北京理工大学 | Two-dimensional transition metal monatomic catalyst and preparation method and application thereof |
| CN114883561B (en) * | 2022-04-18 | 2024-03-01 | 北京理工大学 | Two-dimensional transition metal monoatomic catalyst and preparation method and application thereof |
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