CN117832521A - Preparation method of ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst - Google Patents
Preparation method of ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims description 16
- 239000000843 powder Substances 0.000 claims abstract description 39
- 239000011669 selenium Substances 0.000 claims abstract description 30
- 239000002243 precursor Substances 0.000 claims abstract description 27
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000010431 corundum Substances 0.000 claims abstract description 21
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 10
- YSWBFLWKAIRHEI-UHFFFAOYSA-N 4,5-dimethyl-1h-imidazole Chemical compound CC=1N=CNC=1C YSWBFLWKAIRHEI-UHFFFAOYSA-N 0.000 claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 8
- 239000010453 quartz Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 102000020897 Formins Human genes 0.000 claims description 4
- 108091022623 Formins Proteins 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
- 229910020676 Co—N Inorganic materials 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 238000006479 redox reaction Methods 0.000 description 36
- 239000000446 fuel Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000012528 membrane Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 229920000557 Nafion® Polymers 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 239000010411 electrocatalyst Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
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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
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a ZIF-derived porous carbon supported Co/Se double-atom-site ORR catalyst, which comprises the following steps: dimethyl imidazole, zn (NO) 3 ) 2 ·6H 2 O、Co(NO 3 ) 2 ·6H 2 O is reacted and dried to obtain a precursor, then the precursor is ground into powder, the powder is placed into a corundum boat, the corundum boat is rapidly placed into a hearth at 950 ℃ in an argon atmosphere, the temperature is rapidly increased for heat treatment to obtain black precursor powder, then the black precursor powder is mixed with selenium dioxide and ground into uniform powder, the uniform powder is placed into the corundum boat and placed into a tubular furnace, and the temperature is gradually increased for heat treatment in the argon atmosphere to obtain the ZIF-derived porous carbon-supported Co/Se diatomic ORR catalyst. The Co-Se-N-C catalyst with Co/Se double atom sites prepared by the invention has obviously improved ORR performance in acid electrolyte, which proves that Co-N x And the synergistic effect of Se-C diatomic sites.
Description
Technical Field
The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of a ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) have received widespread attention as one of the most promising next-generation automotive power sources. However, the slow oxidation-reduction reaction (ORR) at the cathode hinders the output performance of PEMFC, and in order to achieve acceptable performance, a highly efficient ORR catalyst is required. Presently, ideal ORR catalysts are considered to be Pt and its alloys, such as commercial Pt nanoparticles supported on carbon black. Nevertheless, their price and scarcity limit their widespread use. Therefore, non-Pt catalysts, which are inexpensive and have performance comparable to Pt, are continually being sought. Co-based catalysts are an excellent potential alternative, but due to the low ORR intrinsic activity of Co-based catalysts, especially in acidic environments, the half-wave potential of the catalyst and its performance in fuel cells still cannot be effectively improved, affecting the operation of the fuel cells at larger voltages. Based on this, it is necessary to increase the intrinsic activity of the catalytic sites by a certain method, thereby increasing the operating power of the fuel cell at higher voltages.
In recent years, single-atom catalysts are receiving more and more attention due to the complete exposure of the active sites, and simple model catalysts are also provided for the research of reaction mechanisms. However, recent studies indicate that single-site catalysts also have some drawbacks: single-atom-site catalysts are easily occupied by intermediates and undergo serious deactivation due to low active center density; single sites are not able to drive multiple electron and multiple proton transfer processes efficiently. To address these problems, the introduction of additional monoatoms to construct heteronuclear diatomic sites may give the catalyst a higher turnover frequency. This strategy may have great potential to overcome these drawbacks and ultimately enhance activity through tunable electronic environments and synergy. Double site catalysts have recently been designed to synthesize certain bimetallic atomic site catalysts, such as Fe/Co, fe/Mn, co/Mn, etc., which exhibit higher ORR activity than the corresponding single metal active site catalysts as an effective way to increase intrinsic activity. Most of the previous studies have focused on the construction of bimetallic atomic site catalysts, and few reports have been made on bimetallic atomic site catalysts in which metal and non-metal atomic sites are combined. Metals and non-metals generally exhibit different electronic structures and physicochemical properties, and the combination of the two types of atoms can play different roles in the catalytic reaction. Diatomic catalysts have received increasing attention as extensions of monoatomic catalysts due to their synergistic effect. However, the investigation of diatomic catalysts is still in an early stage, mainly based on metal atom pairs. Further guidance for the rational design of diatomic active sites requires further experimentation and theoretical exploration.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst, which obviously improves the ORR performance of the Co-Se-N-C catalyst with Co/Se diatomic sites in acid electrolyte, and proves that the Co-N x And the synergistic effect of Se-C diatomic sites.
The technical scheme of the invention is as follows: a preparation method of a ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst is characterized by comprising the following steps of: the preparation method comprises the following steps:
adding dimethyl imidazole into methanol, and uniformly stirring to form a solution A; zn (NO) 3 ) 2 ·6H 2 O、Co(NO 3 ) 2 ·6H 2 Adding methanol into O, and uniformly stirring to form a solution B; adding the solution B into the solution A, magnetically stirring for 10 hours, then adopting methanol to wash for three times, drying to obtain a precursor, grinding the precursor into powder, placing the powder into a corundum boat, placing the corundum boat into a part outside a quartz tube hearth, heating the quartz tube furnace to 950 ℃ under the argon atmosphere, then moving the corundum boat into the hearth, quickly heating the precursor powder, preserving heat for 1.5 hours, and naturally cooling to obtain black precursor powder;
step two, mixing the precursor powder prepared in the step one with selenium dioxide according to a proportion, fully grinding into uniform powder, placing into a corundum boat, and placing into a tube typeIn the furnace, under the argon atmosphere, the temperature is 5 ℃ for min -1 And (3) heating to 300 ℃ for 0.5h, then continuously heating to 1000 ℃ for heat preservation, and naturally cooling to room temperature to obtain the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst.
Preferably, in step one, the dimethylimidazole, zn (NO 3 ) 2 ·6H 2 O and Co (NO) 3 ) 2 ·6H 2 The molar ratio of O is 66:15:1.5.
preferably, the ratio of the molar mass of dimethylimidazole to the volume of methanol in step one is 66mmol:150mL; the Zn (NO) 3 ) 2 ·6H 2 Molar mass of O, co (NO 3 ) 2 ·6H 2 The ratio of the molar mass of O to the volume of methanol was 15mmol:1.5mmol:100mL.
Preferably, the temperature of drying in step one is 60c,
preferably, the mass ratio of the Co-N-C catalyst powder to the selenium dioxide in the second step is (0.5-4): 1.
Preferably, the time of heat preservation in the second step is 1h.
Compared with the prior art, the invention has the following effects:
1. the invention successfully synthesizes a novel double-site electrocatalyst by adjusting the selenium content, and Co-N of the catalyst x And Se-C double sites are highly dispersed in the ZIF-derived porous carbon skeleton. Compared with Co-N-C and Se-N-C single-site catalysts, the designed and constructed Co-Se-N-C catalyst with Co/Se double-atom sites has obviously improved ORR performance in acid electrolyte, which proves that Co-N x And the synergistic effect of Se-C diatomic sites.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a scanning electron microscope picture of a ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst prepared in example 3 of the present invention.
FIG. 2 is a structural and elemental distribution diagram of a preparation of a ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst in accordance with example 3 of the present invention.
Detailed Description
Example 1
The preparation method of the ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst comprises the following steps:
step one, adding 150mL of methanol into 66mmol of dimethyl imidazole, and uniformly stirring for 5min to form a solution A; taking Zn (NO) with a molar mass of 15mmol 3 ) 2 ·6H 2 O, 1.5mmol Co (NO) 3 ) 2 ·6H 2 Adding 100mL of methanol into O, and uniformly stirring to form a solution B; adding the solution B into the solution A, magnetically stirring for 10 hours, then washing with methanol for three times, drying at 60 ℃ to obtain a precursor, grinding the precursor into powder, placing the powder into a corundum boat, placing the corundum boat into a part outside a quartz tube hearth, heating the quartz tube furnace to 950 ℃ in an argon atmosphere, moving the corundum boat into the hearth, quickly heating the precursor powder, preserving heat for 1.5 hours, and naturally cooling to obtain black precursor powder;
step two, the Co-N-C precursor powder prepared in the step one and selenium dioxide (SeO) are taken 2 ) The mass ratio of the Co-N-C catalyst powder to the selenium dioxide is 0.5:1, the Co-N-C catalyst powder and the selenium dioxide are fully mixed according to a proportion and ground into uniform powder, the uniform powder is put into a corundum boat, and the corundum boat is placed into a tubular furnace at 5 ℃ for min under the argon atmosphere -1 And then continuously heating to 1000 ℃ for 1 hour, naturally cooling to room temperature to obtain the ZIF-derived porous carbon supported Co/Se double-atom site ORR catalyst, wherein the sample is marked as Co-Se-N-C-0.5.
Example 2
The preparation method of the embodiment is the same as that of the embodiment 1, except that in the second step, the mass ratio of the precursor powder to selenium dioxide is 1:1, and finally the ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst is prepared and is marked as Co-Se-N-C-1.
Example 3
The preparation method of the embodiment is the same as that of the embodiment 1, except that in the second step, the mass ratio of the precursor powder to selenium dioxide is 2:1, and finally the ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst is prepared and is marked as Co-Se-N-C-2.
Example 4
The preparation method of the embodiment is the same as that of the embodiment 1, except that in the second step, the mass ratio of the precursor powder to selenium dioxide is 4:1, and finally the ZIF-derived porous carbon supported Co/Se diatomic site ORR catalyst is prepared and is marked as Co-Se-N-C-4.
Comparative example 1
The preparation method of the catalyst of the comparative example comprises the following steps:
step one, adding 150mL of methanol into 66mmol of dimethyl imidazole, and uniformly stirring for 5min to form a solution A; taking Zn (NO) with a molar mass of 15mmol 3 ) 2 ·6H 2 O, 1.5mmol Co (NO) 3 ) 2 ·6H 2 Adding 100mL of methanol into O, and uniformly stirring to form a solution B; adding the solution B into the solution A, magnetically stirring for 10 hours, then washing with methanol for three times, drying at 60 ℃ to obtain a precursor, grinding the precursor into powder, placing the powder into a corundum boat, placing the corundum boat into a part outside a quartz tube hearth, heating the quartz tube furnace to 950 ℃ in an argon atmosphere, moving the corundum boat into the hearth, quickly heating the precursor powder, preserving heat for 1.5 hours, and naturally cooling to obtain black precursor powder;
step two, fully grinding the precursor powder prepared in the step one into uniform powder, putting the uniform powder into a corundum boat, putting the corundum boat into a tube furnace, and performing vacuum treatment at 5 ℃ for min under the argon atmosphere -1 And (3) heating to 300 ℃ for 0.5h, then continuously heating to 1000 ℃ for 1h, and naturally cooling to room temperature to obtain the Co-N-C marked catalyst.
The scanning electron microscope picture of the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst prepared in the embodiment 3 of the invention is shown in figure 1, and the structure and element distribution of the prepared ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst are shown in figure 2.
Cathode and anode catalyst layers were prepared using the ORR catalysts prepared in examples 1 to 4 of the present invention and the catalyst prepared in comparative example 1, wherein the cathode catalyst layer was preparedThe preparation process comprises the following steps: 10mg of catalyst was weighed and 275. Mu.L of 5wt% Nafions, 575. Mu.L of ethanol and 150. Mu.L of deionized water were added. The mass ratio of nafion to catalyst in the catalyst slurry was 1.25. The slurry was sonicated for 15 minutes, then stirred in a vortex mixer for 15 minutes, and the sonication and stirring steps were repeated a second time. mu.L of ink was applied to a 2.01cm area using a pipette 2 And the carbon paper gas diffusion layer. There is about 4mg of catalyst per square centimeter of electrode. The preparation process of the anode catalytic layer comprises the following steps: : carbon paper was covered with a catalyst layer of 20% wt% Pt/C, 10mg catalyst was added, 174. Mu.L 5wt% Nafions, 626. Mu.L isopropyl alcohol and 200. Mu.L deionized water. The load is 0.4mgPt cm-2, and the mass ratio of Nafions to the catalyst is 1:1.
The membrane electrode assembly process comprises the following steps: the proton exchange membrane adopts Nafion 117, and MEAs is hot pressed for 2 minutes at 130 ℃ under the pressure of 3Mpa, and the prepared anode and cathode catalysis layers are laminated on the two sides of the membrane, so that the MEA with different cathode catalysis layers is prepared. Fuel cell experiments were performed using a 850e fuel cell test system (Scribner) in combination with a 885 fuel cell potentiostat. In each performance-stability experiment, H of the anode and cathode of the fuel cell was measured 2 /O 2 The temperature was humidified to 80 ℃. Electrochemical Impedance Spectroscopy (EIS) measures 1.0A at constant current and ranges in frequency from 0.01Hz to 10kHz.
The catalyst prepared by the invention has the multiple effects of Co/Se double sites on the performance of a fuel cell and Se atom site introduction: (1) The calculation result of the first principle shows that the introduction of Se atomic sites effectively regulates charge redistribution and can regulate Co-N x The electronic state of the active site, thereby lowering O 2 The rate of desorption determines the activation energy barrier of the step, the energy barrier is reduced from 0.52eV to 0.38eV, and charge transfer is promoted, so that the oxidation-reduction reaction kinetics is improved; the power density of the membrane electrode synthesized under the same conditions from the catalyst of comparative example 1 and the ORR catalyst of example 2 was 228mW cm -2 (ORR catalyst prepared in comparative example 1) was increased to 297mW cm -2 (ORR catalyst prepared in example 3) the charge transfer resistance was reduced from 0.507 Ω (ORR catalyst prepared in comparative example 1) to 0.326 Ω (ORR catalyst prepared in example 3). (2) Due to SeO 2 The sublimation temperature of (2) is low, most volatilizes in the calcination process, and abundant pore structures are left on the catalyst, and the pore volume is 0.60cm 3 g -1 (ORR catalyst prepared in comparative example 1) was increased to 0.71cm 3 g -1 (ORR catalyst prepared in example 3), the porous structure is more conducive to mass transfer. (3) Se-C contributes to H 2 O 2 Decomposition of (C) and scavenging of free radicals, H 2 O 2 The yield was reduced from 6.7% (ORR catalyst prepared in comparative example 1) to 0.3% (ORR catalyst prepared in example 3), improving the durability of the catalyst.
The power density of the membrane electrode synthesized from the ORR catalyst of example 1 was varied from 242mW cm -2 A charge transfer resistance 0.481 Ω and a pore volume of 0.73cm 3 g -1 ，H 2 O 2 The yield was 0.75%.
The power density of the membrane electrode synthesized from the ORR catalyst of example 2 was measured at 254mW cm -2 Charge transfer resistance 0.395 Ω and pore volume 0.65cm 3 g -1 ，H 2 O 2 The yield was 0.47%.
The power density of the membrane electrode synthesized from the ORR catalyst of example 4 was found to be 285mW cm -2 Charge transfer resistance 0.344 Ω and pore volume 0.62cm 3 g -1 ，H 2 O 2 The yield was 0.68%.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (6)
1. A preparation method of a ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst is characterized by comprising the following steps of: the preparation method comprises the following steps:
adding dimethyl imidazole into methanol, and uniformly stirring to form a solution A; zn (NO) 3 ) 2 ·6H 2 O、Co(NO 3 ) 2 ·6H 2 Adding methanol into O, and uniformly stirring to form a solution B; adding the solution B into the solution A, magnetically stirring for 10h, and then adoptingWashing with methanol for three times, drying to obtain a precursor, grinding the precursor into powder, placing the powder into a corundum boat, placing the corundum boat in a part outside a quartz tube hearth, heating the quartz tube furnace to 950 ℃ under argon atmosphere, moving the corundum boat into the hearth, quickly heating the precursor powder, preserving heat for 1.5h, and naturally cooling to obtain black precursor powder;
step two, mixing the precursor powder prepared in the step one with selenium dioxide according to a proportion, fully grinding into uniform powder, placing into a corundum boat, placing into a tube furnace, and placing under argon atmosphere at 5 ℃ for min -1 And (3) heating to 300 ℃ for 0.5h, then continuously heating to 1000 ℃ for heat preservation, and naturally cooling to room temperature to obtain the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst.
2. The method for preparing the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst according to claim 1, wherein the method comprises the steps of: the dimethylimidazole, zn (NO) in step one 3 ) 2 ·6H 2 O and Co (NO) 3 ) 2 ·6H 2 The molar ratio of O is 66:15:1.5.
3. the method for preparing the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst according to claim 1, wherein the method comprises the steps of: the ratio of the molar mass of the dimethylimidazole to the volume of the methanol in the first step is 66mmol:150mL; the Zn (NO) 3 ) 2 ·6H 2 Molar mass of O, co (NO 3 ) 2 ·6H 2 The ratio of the molar mass of O to the volume of methanol was 15mmol:1.5mmol:100mL.
4. The method for preparing the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst according to claim 1, wherein the method comprises the steps of: the temperature of drying in step one was 60 ℃.
5. The method for preparing the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst according to claim 1, wherein the method comprises the steps of: in the second step, the mass ratio of the Co-N-C catalyst powder to the selenium dioxide is (0.5-4) 1.
6. The method for preparing the ZIF-derived porous carbon-supported Co/Se diatomic site ORR catalyst according to claim 1, wherein the method comprises the steps of: and in the second step, the heat preservation time is 1h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310359916.5A CN117832521A (en) | 2023-04-06 | 2023-04-06 | Preparation method of ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst |
| ZA2023/04625A ZA202304625B (en) | 2023-04-06 | 2023-04-21 | Preparation method for a zif-derived porous carbon-supported co/se biatomic site orr catalyst |
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| CN202310359916.5A CN117832521A (en) | 2023-04-06 | 2023-04-06 | Preparation method of ZIF-derived porous carbon-supported Co/Se double-atom-site ORR catalyst |
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