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Preparation method of sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene

A technology of ZIF-67 and conductive graphite, which is applied in the field of preparation of bifunctional oxygen catalysts, achieves the effects of large-scale production, good conductivity, and simple operation

Active Publication Date: 2019-10-25
YUNCHENG UNIVERISTY
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Problems solved by technology

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

Method used

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  • Preparation method of sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene
  • Preparation method of sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene
  • Preparation method of sulfur-doped bifunctional oxygen catalyst based on ZIF-67 and conductive graphene

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preparation example Construction

[0025] (1) Preparation of precursor ZIF-67: Weigh cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:1.5~2, respectively dissolve them in the same volume of anhydrous methanol, and mix the above solutions Uniform and sonicate for 15 minutes, then let the sonicated mixed solution stand still, settle for 5~6 hours, collect the precipitate, wash the precipitate with anhydrous methanol several times, and then disperse the precipitate in absolute 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 ultrasonically for 10min, then weigh a certain amount A certain amount of thioacetamide is dissolved in absolute ethanol, the mass ratio of the thioacetamide to the cobalt nitrate hexahydrate in step (1) is 1:3.5, and slowly added to the above m...

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, dissolve them in 20mL of anhydrous methanol respectively, mix the above solutions evenly and sonicate for 15min, and mix the sonicated The solution was allowed to stand for 6 hours, and the precipitate was collected, washed with anhydrous methanol several times, and then dispersed in 20 mL of absolute ethanol for later 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, measure 10mL of ZIF-67 and add it to the above solution for 10min, then weigh 0.5g of thioacetamide solution In 10mL of absolute ethanol, and slowly added to the above mixed solution, stirred for 5min. Heat the uniformly stirred mix...

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Abstract

The invention discloses a preparation method of a sulfur-doped bifunctional oxygen catalyst based on ZIF-67 (Zeolitic Imidazolate Framework) and conductive graphene, and belongs to the technical fieldof zinc-air cell catalysts. The preparation method comprises the steps of taking ZIF-67 as a template, adding a certain amount of conductive graphene, taking thioacetamide as a sulfur source, and calcining in an inert atmosphere through a one-step solvothermal synthesis method to prepare a carbon porous nano-composite. The carbon material inherits the porous structure of ZIF and effectively improves the specific surfaces of the catalyst, the active site, the specific surface area of the material and the conductivity of the material are increased by adding the conductive graphene and the sulfur source, and the conduction of electrons is more facilitated. The obtained catalyst has good oxygen reduction (ORR) and oxygen evolution (OER) electrocatalytic activity in an alkaline medium, the electrocatalytic performance of the bifunctional oxygen catalyst is improved, and the bifunctional oxygen catalyst has potential application value in the fields of energy conversion and storage.

Description

technical field [0001] The invention belongs to the field of zinc-air battery catalyst technology and electrochemical catalysis, and specifically relates 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 for the conversion of dispersible energy, which can alleviate the environmental and energy crisis to a large extent. Nonetheless, advanced battery technologies are still hampered by slow, poorly stable, and inefficient kinetics of oxygen electrocatalysis. Therefore, the use of advanced bifunctional electrocatalysts to accelerate the kinetics of ORR and OER reactions is the key to determining the cost and performance of batteries, and is an important way to achieve efficient energy conversion and storage. So far, the main standard electrocatalysts for oxygen reac...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/06
CPCH01M12/06H01M4/9008H01M4/8673H01M4/8652H01M4/88Y02E60/50
Inventor 弓巧娟孙晓玲梁云霞
Owner YUNCHENG UNIVERISTY
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