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Method for growing MOF by using bacteria as template to prepare multi-stage porous carbon material and application of multi-stage porous carbon material 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 facilitate industrial fermentation, Good cycle performance, the effect of suppressing the shuttle effect

Active Publication Date: 2020-02-04
SUZHOU UNIV
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  • Summary
  • 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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  • Method for growing MOF by using bacteria as template to prepare multi-stage porous carbon material and application of multi-stage porous carbon material in energy storage devices
  • Method for growing MOF by using bacteria as template to prepare multi-stage porous carbon material and application of multi-stage porous carbon material in energy storage devices
  • Method for growing MOF by using bacteria as template to prepare multi-stage porous carbon material and application of multi-stage porous carbon material in energy storage devices

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 0.2g Escherichia coli bacteria powder was uniformly dispersed into a bacterial suspension with 200mL methanol, then 2.4g dimethylimidazole and 1.2g zinc nitrate were added successively, stirred evenly, ultrasonicated for 30min, and left to grow ZIF-8 (a 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 growing an MOF material at the surfaces of bacteria by using bacteria as a template and converting the MOF material into a multi-stage porous carbon material. Themethod includes the following steps: (1) dispersing bacterial powder into a precursor solution, sequentially adding an organic ligand and a soluble metal salt, performing uniform mixing, and allowingthe mixture to stand in a sealed manner for 12-24 h; and (2) centrifuging and washing the solution after standing, drying the obtained precipitate, performing carbonization, and performing grinding toobtain the multi-stage porous carbon material. The invention also discloses the multi-stage porous carbon material prepared by the method, and a lithium-sulfur battery and a zinc-air battery preparedfrom the multi-stage porous carbon material. The preparation method for the multi-stage porous carbon material provided by the invention uses the bacteria as the biological template and a part of carbon sources, uses the bacterial structure combined with the porous MOF material to construct the multi-stage porous carbon material, and 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 (500 Wh 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 applicatio...

Claims

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Application Information

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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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