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Preparation of sulfur-doped bifunctional oxygen catalysts based on zif-67 and conductive graphene
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A technology of ZIF-67 and conductive graphite, which is applied in the field of preparation of bifunctional oxygen catalysts to achieve the effects of fast electron transfer rate, excellent conductivity and abundant resources
Active Publication Date: 2022-05-24
YUNCHENG UNIVERISTY
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Although some achievements have been made in the preparation of porous carbon materials using ZIF as the precursor, the zeolite imidazolate framework material (ZIF-67) is used as a Co-intercalated N-doped carbon material template, and thioacetamide is Sulfur source, conductive graphene synergistically prepared a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene, and explored its ORR and OER bifunctional catalytic performance, and its application in the field of metal-air batteries has not been reported
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[0025] (1) Preparation of precursor ZIF-67: Weigh cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:1.5~2, dissolve them in the same volume of anhydrous methanol, and mix the above solutions Evenly and ultrasonically for 15min, then let the sonicated mixed solution stand, settle for 5~6h, collect the precipitate, wash the precipitate with anhydrous methanol for several times, and then disperse the precipitate in anhydrous ethanol for later use, that is, ZIF- 67;
[0026] (2) Co 9 S 8 Preparation of / S-GN bifunctional catalyst: Weigh a certain amount of conductive graphene, ultrasonically disperse it in anhydrous methanol, and measure the ZIF-67 prepared above, add it to the above solution and ultrasonicate for 10 min, and then weigh a certain amount of Amount of thioacetamide is dissolved in absolute ethanol, and the mass ratio of the thioacetamide to the cobalt nitrate hexahydrate in step (1) is 1:3.5, and is slowly added to the above mixed solution, s...
Embodiment 1
[0028] A preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene:
[0029] (1) Preparation of precursor ZIF-67: Weigh 1.75g of cobalt nitrate hexahydrate and 3.2g of dimethylimidazole, respectively, dissolve them in 20mL of anhydrous methanol, mix the above solutions uniformly and sonicate for 15min. The solution was allowed to stand for 6 hours, and the precipitate was collected, washed with anhydrous methanol for several times, and then dispersed in 20 mL of anhydrous ethanol for use, which was designated as ZIF-67.
[0030] (2) Co 9 S 8 Preparation of / S-GN bifunctional catalyst: Weigh 0.02g of conductive graphene, ultrasonically disperse it in 10mL of anhydrous methanol, weigh 10mL of ZIF-67, add it to the above solution and ultrasonicate for 10min, then weigh 0.5g of thioacetamide solution in 10 mL of absolute ethanol, and slowly added to the above mixed solution, stirring for 5 min. The uniformly stirred mixed soluti...
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Abstract
The invention discloses a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 (zeolite imidazolate framework material) and conductive graphene, and belongs to the technical field of zinc-empty battery catalysts. Using ZIF‑67 as a template, adding a certain amount of conductive graphene and thioacetamide as a sulfur source, a carbon porous nanocomposite was prepared by one-step solvothermal synthesis and calcined in an inert atmosphere. The carbon material inherited The porous structure of ZIF effectively increases the specific surface area of the catalyst, and the addition of conductive graphene and sulfur sources increases the active sites, the specific surface area of the material, and the conductivity of the material, which is more conducive to the conduction of electrons. The obtained catalyst has good electrocatalytic activity for oxygen reduction (ORR) and oxygen evolution (OER) in alkaline medium, and the electrocatalytic performance of this bifunctional oxygen catalyst has been improved, which has potential application value in the field of energy conversion and storage.
Description
technical field [0001] The invention belongs to the field of zinc-air battery catalyst technology and electrochemical catalysis, in particular to a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene. Background technique [0002] Metal-air batteries, such as zinc-air batteries and magnesium-air batteries, have become a research hotspot in recent years because they can reduce the environmental and energy crisis to a great extent in order to convert dispersible energy. Nonetheless, advanced battery technologies are still hindered by the slow, poorly stable, and inefficient oxygen electrocatalytic kinetics. Therefore, using advanced bifunctional electrocatalysts to accelerate the kinetics of ORR and OER reactions is the key to determining the cost and performance of batteries, and an important way to achieve efficient energy conversion and storage. So far, the main standard electrocatalysts for oxygen reactions are noble m...
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