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A method for preparing hierarchical porous carbon materials by growing mof with bacteria as a template and its application in energy storage devices

A porous carbon material, MOF technology, applied in the field of porous carbon materials, can solve the problems that a single noble metal catalyst cannot be used as a dual-function electrocatalyst at the same time, expensive and insufficient stability, restricting the wide application of noble metal catalysts, etc., to achieve the suppression of shuttle effect, The effect of good cycle performance and excellent catalytic performance

Active Publication Date: 2021-06-11
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Pt, IrO 2 , RuO 2 have good activity, but their scarcity, cost, and lack of stability severely restrict the widespread application of these noble metal catalysts in zinc-air batteries
Furthermore, a single noble metal catalyst cannot serve as a bifunctional electrocatalyst for both ORR and OER

Method used

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  • A method for preparing hierarchical porous carbon materials by growing mof with bacteria as a template and its application in energy storage devices
  • A method for preparing hierarchical porous carbon materials by growing mof with bacteria as a template and its application in energy storage devices
  • A method for preparing hierarchical porous carbon materials by growing mof with bacteria as a template and its application in energy storage devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Disperse 0.2g of Escherichia coli powder with 200mL of methanol to form a bacterial suspension, then add 2.4g of dimethylimidazole and 1.2g of zinc nitrate in sequence, stir evenly, and then sonicate for 30min. MOF materials). After 24 hours, centrifuge and wash with methanol several times to obtain a white precipitate, vacuum-dry it in a 60-degree oven for 12 hours, take it out, grind and weigh it, and then carbonize it at a heating rate of 5°C / min to 900°C under the protection of nitrogen or argon, and the carbonization time is 5 hours . After carbonization and cooling, it is ground to obtain a capsule-shaped multi-level porous active multifunctional carbon material.

[0041] The microscopic appearance of the multifunctional carbon material that embodiment 1 obtains is as follows figure 2 shown.

Embodiment 2

[0043] Disperse 0.2g of Escherichia coli powder with 200mL of methanol to form a bacterial suspension, then add 2.4g of dimethylimidazole, 0.9g of zinc nitrate and 0.3g of cobalt nitrate in sequence, stir well, then ultrasonicate for 30min, seal and let stand at room temperature to grow ZIF . After 24 hours, centrifuge and wash with methanol several times to obtain a light blue precipitate, dry it in a 60-degree oven for 12 hours in a vacuum, take it out, grind and weigh it, and then carbonize it at a heating rate of 5°C / min to 900°C under the protection of nitrogen or argon. Time 5h. After carbonization and cooling, it is ground to obtain a capsule-shaped multi-level porous active multifunctional carbon material.

[0044] The microscopic appearance of the multifunctional carbon material that embodiment 2 obtains is as follows image 3 shown.

Embodiment 3

[0046] Disperse 0.2g of Escherichia coli powder with 200mL of methanol to form a bacterial suspension, then add 2.4g of dimethylimidazole, 0.6g of zinc nitrate and 0.6g of cobalt nitrate in sequence, stir well and then ultrasonicate for 30min, seal and let stand at room temperature to grow ZIF . After 24 hours, it was centrifuged and washed with methanol several times to obtain a blue precipitate. It was vacuum-dried in a 60-degree oven for 12 hours, taken out, ground and weighed, and then carbonized at a heating rate of 5°C / min to 900°C under the protection of nitrogen or argon. The carbonization time 5h. After carbonization and cooling, it is ground to obtain a capsule-shaped multi-level porous active multifunctional carbon material.

[0047] Due to the increase of Co content, the product contains more Co nanoparticles and the product is enriched on the surface, the SEM image is as follows Figure 4 shown.

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Abstract

The invention discloses a method for using bacteria as a template to grow MOF materials on the surface of bacteria and transform them into multi-level porous carbon materials, which comprises the following steps: (1) dispersing the bacteria powder in the precursor solution, adding organic compounds in sequence body, soluble metal salt, mix evenly, seal and stand for 12 to 24 hours; (2) centrifuge and wash the solution after standing, and the obtained precipitate is dried, carbonized and ground, which is the multi-level porous carbon material . The invention also discloses the multi-level porous carbon material prepared by the method and the lithium-sulfur battery and the zinc-air battery prepared therefrom. In the preparation method of the multi-level porous carbon material of the present invention, bacteria are used as biological templates and part of the carbon source, and the multi-level porous carbon material is constructed by combining the bacterial structure with the porous MOF material, and the method is extremely simple and effective.

Description

technical field [0001] The invention relates to the technical field of porous carbon materials, in particular to a multi-level porous carbon material prepared by growing MOF with bacteria as a template and its application in energy storage devices. Background technique [0002] Lithium-sulfur battery is a new type of battery that combines elemental sulfur cathode and metal lithium anode, and its theoretical mass specific capacity is 1675mAh·g -1 , the energy density is as high as 2500Wh·kg -1 It is a traditional lithium-ion battery (500Wh·kg -1 ) 5 times. Cathode sulfur materials are abundant on the earth, and their simple substances and compounds are widely found in a variety of minerals. They have the advantages of wide sources, low cost, and environmental protection. These advantages are urgently needed for the rapid development of electric vehicles and large-scale smart grids. Although lithium-sulfur batteries show very promising performance, the practical application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B25/08C01B21/06H01M4/62H01M4/90H01M12/06H01M10/052
CPCC01B21/06C01B25/08C01P2002/72C01P2004/03C01B32/05H01M4/625H01M4/628H01M4/9083H01M10/052H01M12/06Y02E60/10
Inventor 邓昭赵晓辉胡加鹏袁协涛王崇龙
Owner SUZHOU UNIV
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