CN112310422B - A kind of iron-nitrogen doped hollow porous carbon material and preparation method thereof - Google Patents
A kind of iron-nitrogen doped hollow porous carbon material and preparation method thereof Download PDFInfo
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- 239000003575 carbonaceous material Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- YYXHRUSBEPGBCD-UHFFFAOYSA-N azanylidyneiron Chemical compound [N].[Fe] YYXHRUSBEPGBCD-UHFFFAOYSA-N 0.000 title claims abstract description 16
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- 239000000377 silicon dioxide Substances 0.000 claims abstract description 35
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 26
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- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 claims abstract description 6
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- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 claims description 22
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 21
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 claims description 11
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 11
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- QZRHHEURPZONJU-UHFFFAOYSA-N iron(2+) dinitrate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QZRHHEURPZONJU-UHFFFAOYSA-N 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims 8
- 229920000867 polyelectrolyte Polymers 0.000 claims 4
- IQDGSYLLQPDQDV-UHFFFAOYSA-N dimethylazanium;chloride Chemical compound Cl.CNC IQDGSYLLQPDQDV-UHFFFAOYSA-N 0.000 claims 2
- 238000005554 pickling Methods 0.000 claims 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims 2
- -1 allyl dimethyl ammonium chloride Chemical compound 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000000446 fuel Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000011970 polystyrene sulfonate Substances 0.000 description 9
- 229960002796 polystyrene sulfonate Drugs 0.000 description 9
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- 239000002253 acid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 239000010411 electrocatalyst Substances 0.000 description 2
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- 238000006722 reduction reaction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229920002415 Pluronic P-123 Polymers 0.000 description 1
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- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical group O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- LZKLAOYSENRNKR-LNTINUHCSA-N iron;(z)-4-oxoniumylidenepent-2-en-2-olate Chemical group [Fe].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O LZKLAOYSENRNKR-LNTINUHCSA-N 0.000 description 1
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- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001992 poloxamer 407 Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
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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
- H01M4/96—Carbon-based electrodes
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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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- 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
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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
- H01M4/9075—Catalytic material supported on carriers, e.g. powder carriers
- H01M4/9083—Catalytic material supported on carriers, e.g. powder carriers on carbon or graphite
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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
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Abstract
The invention discloses an iron-nitrogen doped hollow porous carbon material and a preparation method thereof, and relates to a synthesis technology of a porous material. The preparation method comprises the following steps: (1) SiO22Synthesizing a ball; (2) polyelectrolyte-modified SiO2Preparing; (3) iron-doped ZIF-8 coated polyelectrolyte-modified SiO2Preparing a composite material; (4) and preparing the iron-nitrogen doped hollow porous carbon material. The iron-nitrogen doped hollow porous carbon material prepared by the preparation method has uniform size, good ORR catalytic activity and stability, and lower price compared with the traditional Pt/C catalyst.
Description
Technical Field
The invention relates to a synthesis technology of a porous material, in particular to an iron-nitrogen doped hollow porous carbon material and a preparation method thereof.
Background
The fuel cell is a representative of an energy conversion device, can directly convert chemical energy into electric energy, and becomes a core technology for solving the problems of energy crisis, environmental pollution and the like at present due to the characteristics of high energy conversion rate, small pollution, portability and the like. However, the cathode Oxygen Reduction Reaction (ORR) kinetics are slow, which limits the commercial application of fuel cells. The electrocatalyst with excellent performance can accelerate the electrochemical reaction kinetics of the fuel cell electrode-electrolyte interface, improve the performance of the fuel cell and prolong the service life of the fuel cell. Therefore, the research on the ORR electrocatalyst of the fuel cell has been an important matter for the research and invention of scientists.
In view of the increasing environmental pollution and the demand for clean energy devices such as fuel cells and metal-air batteries, the development of highly efficient and stable catalysts to reduce the overpotential of ORR is urgently required. To date, commercial Pt/C remains the most effective catalyst for ORR and is widely used in commercial fuel cells. However, the inevitable disadvantages of low reserves, high price, easy aggregation, etc. severely limit the large-scale commercial application of Pt/C based fuel cells. The most important task at present is to design inexpensive non-noble metal ORR catalysts with excellent activity and stability.
Porous carbon materials are promising carbon materials, and have attracted great interest due to their high electron transport ability, large specific surface area, and flexibility in shape and structure. The synthesis methods of porous carbon materials commonly used are classified into a template method and a non-template method. Among them, the template method is the most used method, and the template method is a commonly used method for efficiently preparing a porous carbon catalyst. The template method is classified into a hard template method and a soft template method according to the physicochemical properties of the selected template, for example, SiO2And metal oxides are typical of hard templates, while surfactants such as Pluronic P123 and Pluronic F127 may be used as typical soft templates. The large pore structure created by the removal of the template may maximize exposure of the reaction centers and facilitate mass transport during ORR.
Metal Organic Frameworks (MOFs) are crystalline materials formed by the coordination bonding of metal ions or metal clusters with rigid organic ligands and having an infinite network structure, consisting of two inorganic and organic moieties.
Metal Organic Frameworks (MOFs) with intrinsic M-N sites have large specific surface area and abundant pore structure, and are effective precursors for preparing ORR catalysts. However, poor electrical conductivity is a fatal disadvantage, which severely restricts the application of MOFs in the field of electrocatalysis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ORR (oxygen radical reduction) efficient and stable iron-nitrogen doped hollow porous carbon material and a preparation method thereof. Compared with the traditional Pt/C catalyst, the catalyst is also lower in price.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a preparation method of an iron-nitrogen doped hollow porous carbon material comprises the following steps:
(1) synthesis of silica spheres: mixing ethyl orthosilicate, ethanol, ammonia water and deionized water, stirring, centrifuging, washing and drying to obtain silicon dioxide spheres;
(2) polyelectrolyte-modified SiO2(PP-SiO2) The preparation of (1): adding the silica spheres into a poly (diallyldimethylammonium chloride) (PDDA) solution, stirring, centrifuging, and washing to obtain PDDA modified SiO2(P-SiO2) (ii) a Then adding P-SiO2Adding into sodium polystyrene sulfonate (PSS) solution, stirring, centrifuging to obtain polyelectrolyte-modified SiO2(PP-SiO2)；
The mass fraction of the poly (diallyldimethylammonium chloride) in the poly (diallyldimethylammonium chloride) solution is 0.8-1.2%, and the ratio of the mass of the silicon dioxide spheres to the volume of the poly (diallyldimethylammonium chloride) solution is 3 (70-90) g/mL; the mass fraction of the sodium polystyrene sulfonate in the sodium polystyrene sulfonate solution is 0.8-1.2%;
(3) iron-doped ZIF-8 coated PP-SiO2Composite material (PP-SiO)2@ ZIF-8-Fe): dissolving 2-methylimidazole in an organic solvent to obtain a 2-methylimidazole solution; then six willZinc nitrate, PP-SiO2Dissolving ferric nitrate nonahydrate in an organic solvent to obtain a mixed solution A; dripping the 2-methylimidazole solution into the mixed solution A, stirring, aging, centrifuging, collecting solids, and finally washing and drying to obtain the PP-SiO2@ZIF-8-Fe；
(4) Preparation of iron-nitrogen doped hollow porous carbon materials (Fe/N-HPCs): and (4) calcining the composite material obtained in the step (3) under nitrogen at the temperature of 800-1000 ℃ for 1.5-2.5h, cooling to 25-30 ℃ after calcination, carrying out acid washing to remove the silicon dioxide template, washing and drying to obtain the iron-nitrogen doped hollow porous carbon material.
Preferably, in the step (1), the volume ratio of the tetraethoxysilane, the ethanol, the ammonia water and the deionized water is as follows: ethyl orthosilicate: ethanol: ammonia water: deionized water ═ (0.5-0.7): (13-17): (0.5-0.9): (3-7).
In the step (1), the volume ratio of the ethyl orthosilicate, the ethanol, the ammonia water and the deionized water is as follows: ethyl orthosilicate: ethanol: ammonia water: deionized water 0.6: 15: 0.7: 5.
preferably, in the step (2), when the mass fraction of the poly (diallyldimethylammonium chloride) in the poly (diallyldimethylammonium chloride) solution is 1%, the ratio of the mass of the silica spheres to the volume of the poly (diallyldimethylammonium chloride) solution is: 3:80 g/mL; in the sodium polystyrene sulfonate solution, when the mass fraction of the sodium polystyrene sulfonate is 1%, the SiO is2The ratio of the mass of (2) to the volume of the sodium polystyrene sulfonate is 3:80 g/mL.
Preferably, in the step (3), zinc nitrate hexahydrate and polyelectrolyte-modified SiO2The mass ratio of ferric nitrate nonahydrate to 2-methylimidazole is as follows: zinc nitrate hexahydrate: polyelectrolyte-modified SiO2: ferric nitrate nonahydrate: 2-methylimidazole ═ (105-: (180-220): (5-30): (140-260); the stirring time is 10-14h, and the aging time is 10-14 h.
Preferably, in the step (3), zinc nitrate hexahydrate and polyelectrolyte-modified SiO2The mass ratio of ferric nitrate nonahydrate to 2-methylimidazole is as follows: zinc nitrate hexahydrate:polyelectrolyte-modified SiO2: ferric nitrate nonahydrate: 2-methylimidazole ═ 150: 200: 5: 200 of a carrier; the time required for stirring is 12h, and the time required for aging is 12 h.
Preferably, in the step (4), the acid cleaning is performed by hydrofluoric acid, and the mass fraction of HF in the hydrofluoric acid is 4-6%.
Meanwhile, the invention discloses the iron-nitrogen doped hollow porous carbon material prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a preparation method of an iron-nitrogen doped hollow porous carbon material, the carbon material prepared by the method has uniform size, and the introduction of iron atoms and nitrogen atoms into the porous carbon material not only increases the density of active sites of a catalyst, but also enhances the conductivity and stability of the catalyst, thereby obviously improving the catalytic performance and durability of the catalyst.
Drawings
FIG. 1 is SiO prepared in example 12Transmission electron microscopy of the ball;
FIG. 2 is the Fe-doped ZIF-8 coated polyelectrolyte-modified SiO prepared in example 12Transmission electron micrographs of the composite;
FIG. 3 is a transmission electron microscope image of an iron-nitrogen doped hollow porous carbon material prepared in example 1;
FIG. 4 is a graph of ORR polarization curves for examples 1-6 and comparative examples 1-2;
FIG. 5 is a graph of i-t curves for example 1 and Pt/C.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1
In an embodiment of the iron-nitrogen-doped hollow porous carbon material of the present invention, a preparation method of the iron-nitrogen-doped hollow porous carbon material includes the following steps:
(1)SiO2synthesis of the ball: mixing 0.6mL of ethyl orthosilicate, 15mL of ethanol and 0.7mL of ethanol in mass percentMixing 25-28% ammonia water and 5mL deionized water, stirring for 10h, centrifuging at 8000rpm for 3min, washing with ethanol for 3 times, drying in vacuum drying oven for 12h to obtain the SiO2A ball;
(2)PP-SiO2the preparation of (1): 3g of SiO2Adding the ball into 80mL of PDDA solution with the mass fraction of 1%, stirring for 1h, centrifuging, and washing to obtain P-SiO2(ii) a Then the prepared P-SiO2Adding 80mL of PSS solution with the mass fraction of 1% of PSS, stirring for 1h, centrifuging and washing to obtain the PP-SiO2；
(3)PP-SiO2Preparation of @ ZIF-8-Fe: dissolving 200mg of 2-methylimidazole in 10mL of methanol to obtain a 2-methylimidazole solution; then 150mg of zinc nitrate hexahydrate and 200mg of PP-SiO2And 5mg of ferric nitrate nonahydrate are dissolved in 20mL of methanol to obtain a mixed solution A; dropwise adding the 2-methylimidazole solution into the mixed solution A, stirring for 12h, aging, standing for 12h, centrifuging at the rotating speed of 6000rpm, collecting solids, washing for 3 times by using methanol, and drying at 60 ℃ for 12h to obtain the PP-SiO2@ZIF-8-Fe；
(4) Preparation of Fe/N-HPCs: subjecting the PP-SiO of step (3) to2And @ ZIF-8-Fe is calcined under nitrogen, the calcining temperature is 900 ℃, the calcining time is 2 hours, the calcination is cooled to room temperature after the calcination is finished, then hydrofluoric acid with the HF mass fraction of 5% is used for soaking for 24 hours, a silicon dioxide template is removed, the washing is carried out for 3 times by using deionized water, and the drying is carried out in a vacuum drying oven for 12 hours, so that the Fe/N-HPCs are obtained.
Example 2
In an embodiment of the iron-nitrogen-doped hollow porous carbon material of the present invention, the preparation method of the iron-nitrogen-doped hollow porous carbon material is the same as that in embodiment 1 except that the content of ferric nitrate nonahydrate is 10 mg.
Example 3
In an embodiment of the iron-nitrogen-doped hollow porous carbon material according to the present invention, in the preparation method of the iron-nitrogen-doped hollow porous carbon material according to the embodiment, the content of iron nitrate nonahydrate is 20mg, the usage amount of the PDDA solution is 90mL, the mass fraction of PDDA in the PDDA solution is 0.8%, the usage amount of the PSS solution is 90mL, the mass fraction of PSS in the PSS solution is 0.8%, and the remaining preparation steps are the same as those in embodiment 1.
Example 4
In an embodiment of the iron-nitrogen-doped hollow porous carbon material according to the present invention, in the preparation method of the iron-nitrogen-doped hollow porous carbon material according to the embodiment, the content of iron nitrate nonahydrate is 30mg, the usage amount of the PDDA solution is 70mL, the mass fraction of PDDA in the PDDA solution is 1.2%, the usage amount of the PSS solution is 70mL, the mass fraction of PSS in the PSS solution is 1.2%, and the remaining preparation steps are the same as those in embodiment 1.
Example 5
In an embodiment of the iron-nitrogen-doped hollow porous carbon material of the present invention, the preparation method of the iron-nitrogen-doped hollow porous carbon material described in this embodiment is the same as that in embodiment 1 except that, in step (3), the mass of zinc nitrate hexahydrate is 105mg, and the mass of 2-methylimidazole is 140 mg.
Example 6
In an embodiment of the iron-nitrogen-doped hollow porous carbon material of the present invention, a preparation method of the iron-nitrogen-doped hollow porous carbon material described in this embodiment is the same as that of embodiment 1 except that the mass of zinc nitrate hexahydrate in step (3) is 195mg and the mass of 2-methylimidazole is 260 mg.
Comparative example 1
An iron-nitrogen doped hollow porous carbon material was prepared according to the method of this comparative example using the same procedures as in example 1 except that iron nitrate nonahydrate was replaced with ferrous sulfate heptahydrate.
Comparative example 2
An iron-nitrogen doped hollow porous carbon material was prepared according to the same method as in example 1, except that iron nitrate nonahydrate was replaced with iron acetylacetonate.
1) Topography characterization
FIG. 1 shows SiO prepared in example 1 of the present invention2Transmission electron micrograph of ball1, SiO2The balls are very regular in shape and relatively uniform in size. FIG. 2 is the Fe-doped ZIF-8 coated polyelectrolyte-modified SiO prepared in example 12The transmission electron microscope picture of the composite material can be seen from figure 2, the edge of the particle is in a burr shape, which shows that organic matter is coated on SiO2The surface of the ball. FIG. 3 is a transmission electron micrograph of an iron-nitrogen doped hollow porous carbon material prepared in example 1, from which it can be seen that SiO is etched away with hydrofluoric acid2Hollow Fe-CN spheres with a shell of about 10nm were obtained.
2) Performance characterization
FIG. 4 is a graph showing the polarization curves of the catalysts prepared in examples 1 to 6 and comparative examples 1 to 2, and it can be seen from the graphs that the ORR activity (E) of example 1 is measured in a 0.10M KOH solution saturated with oxygenonset＝0.96V,E 1/20.86V) greater than commercial Pt/C (E)onset＝0.96V,E 1/20.81V) with better peak potential and peak current density. In addition, other examples also have more positive half-wave potential than the comparative example, indicating that the catalyst prepared by the preparation method disclosed in the present invention has more excellent ORR activity.
To further evaluate the stability of the material, we performed chronoamperometric curve measurements on the catalyst of example 1 and on a commercial Pt/C (fig. 5). As shown in FIG. 5, after 20000s measurement, the current of the target catalyst reached 95.8%, while the current of the commercial Pt/C reached 78.3%, and the stability of the target catalyst was much higher than that of the commercial Pt/C as shown by comparison.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
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| CN113813975A (en) * | 2021-07-30 | 2021-12-21 | 五邑大学 | ZIF-8 derived hierarchical pore M-N-C catalyst and preparation method thereof |
| CN113809282B (en) * | 2021-09-17 | 2023-02-14 | 河北工业大学 | High-capacity nitrogen-doped carbon-coated SiO x Preparation method of nano-beam lithium ion battery cathode material |
| CN113851664B (en) * | 2021-10-28 | 2023-04-25 | 南京师范大学 | Method for preparing hollow sphere electrocatalyst containing sp-nitrogen doped graphite alkyne, prepared material and application |
| CN114188557B (en) * | 2021-10-29 | 2023-03-31 | 陕西师范大学 | Preparation method and application of multi-mesoporous transition metal-nitrogen-carbon catalyst |
| CN114588907B (en) * | 2022-02-28 | 2024-07-05 | 山东鼎信新材料科技有限公司 | Catalyst and preparation method and application thereof |
| CN114797936B (en) * | 2022-04-19 | 2023-09-19 | 东莞理工学院 | CO (carbon monoxide) 2 Reduction catalyst, application and preparation method thereof |
| CN114883569B (en) * | 2022-07-06 | 2022-10-25 | 天能新能源(湖州)有限公司 | Preparation method of Fe-doped Si/C composite material for lithium ion battery cathode |
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