Heteroatom-doped porous carbon material and preparation method thereof and application in zinc-air battery

A technology of porous carbon materials and heteroatoms, applied in heteroatom-doped porous carbon materials and its preparation and application in zinc-air batteries, can solve the problems of low catalytic activity, limited material sources, and high preparation costs, and achieve improved Specific surface area, effect of enhancing catalytic activity

Inactive Publication Date: 2018-10-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of low catalytic activity, limited material source and high preparation cost of existing fuel cell and metal-air battery positive electrode materials, the first purpose of the p

Method used

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  • Heteroatom-doped porous carbon material and preparation method thereof and application in zinc-air battery
  • Heteroatom-doped porous carbon material and preparation method thereof and application in zinc-air battery
  • Heteroatom-doped porous carbon material and preparation method thereof and application in zinc-air battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step (1): Preparation of Biomass Self-Assembly

[0050] Dissolve 1.5 g of the biomass precursor BSA in 20 mL of water, add 8 mmol of sodium hydroxide, and keep stirring at room temperature. After 30 min, the biomass self-assembly can be obtained. Then, the water is removed by freeze-drying method, and the dry biomass self-assembly can be obtained.

[0051] Step (2): Obtaining heteroatom-doped porous carbon materials

[0052] Put the dry biomass self-assembly obtained in step (1) in a tube furnace, and carbonize at 900°C under an inert atmosphere to obtain a heteroatom-doped porous carbon material, denoted as BSA-8 -900, its specific surface area is 1274.1305m 2 g -1 , the pore size distribution is distributed in micropores, mesopores and macropores, showing a multi-level pore distribution.

[0053] Step (3): Test of oxygen reduction reaction of carbon materials and assembly and testing of zinc-air batteries:

[0054] 1. Wash the obtained carbon material several tim...

Embodiment 2

[0058] Step (1): Dissolve 1.5 g of the biomass precursor BSA in 20 mL of water, add 8 mmol of sodium hydroxide, and keep stirring at room temperature. After 30 min, the biomass self-assembly can be obtained. Then, the water is removed by freeze-drying method, and the dry biomass self-assembly can be obtained.

[0059] Step (2): Obtaining heteroatom-doped porous carbon materials

[0060] Put the dried biomass self-assembled body obtained in step (1) in a tube furnace, and carbonize it at 700°C under an inert atmosphere to obtain a heteroatom-doped porous carbon material, denoted as BSA-8 -700, which has a surface area of ​​548.7413m 2 g -1 , the pore size distribution is mainly concentrated in the micropore area, and there is a small amount of distribution in the macropore area.

[0061] Step (3): Test of oxygen reduction reaction of carbon materials and assembly and testing of zinc-air batteries:

[0062] 1. Wash the obtained carbon material several times with secondary wa...

Embodiment 3

[0066] Step (1): Dissolve 1.5 g of the biomass precursor BSA in 20 mL of water, add 8 mmol of sodium hydroxide, and keep stirring at room temperature. After 30 min, the biomass self-assembly can be obtained. Then, the water is removed by freeze-drying method, and the dry biomass self-assembly can be obtained.

[0067] Step (2): Obtaining heteroatom-doped porous carbon materials

[0068] Put the dry biomass self-assembly obtained in step (1) in a tube furnace, and carbonize at 500°C under an inert atmosphere to obtain a heteroatom-doped porous carbon material, denoted as BSA-8 -500, its specific surface area is 17.3566m 2 g -1 , the pore size distribution mainly has a small amount of distribution in the macropore area.

[0069] Step (3) Oxygen reduction reaction test of carbon materials and zinc-air battery assembly and testing:

[0070] 1. Wash the obtained carbon material several times with secondary water, and after vacuum drying, take a small amount of carbon material, ...

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Abstract

The invention discloses a heteroatom-doped porous carbon material and a preparation method thereof and an application in a zinc-air battery. A three-dimensional network structure self-assembly body isformed by a biomass material in an alkaline solution through self-assembly; and the three-dimensional network structure self-assembly body is freeze-dried, put into a protective atmosphere and carbonized to obtain the heteroatom-doped porous carbon material. The heteroatom-doped porous carbon material is high in catalytic activity and good in stability and can replace existing Pt/C for use, and the zinc-air battery with stable discharge voltage and high capacity can be obtained when the heteroatom-doped porous carbon material is applied to the zinc-air battery as an oxygen reduction catalyst.The heteroatom-doped porous carbon material is simple in preparation process and low in cost and is expected to be applied to industrial production.

Description

technical field [0001] The invention relates to a porous carbon material and its preparation method and application, in particular to a three-dimensional network structure self-assembled body formed by self-assembly of a biomass material in an alkaline solution, and then subjected to freeze-drying and high-temperature carbonization to prepare a heteroatom-doped carbon material. The method of the heteroporous carbon material also relates to the application of the heteroatom-doped porous carbon material as an oxygen reduction catalyst in the positive electrode material of the zinc-air battery, and belongs to the field of electrocatalytic energy storage materials. Background technique [0002] With the increasing demand for global energy, the massive utilization of traditional fossil fuels (such as coal, oil, and natural gas) not only causes irreversible changes in the environment and climate, but also causes serious energy crises due to the excessive use of these primary energy...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8825H01M4/90H01M4/9016Y02E60/50
Inventor 刘又年梁凯新王立强何海传
Owner CENT SOUTH UNIV
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