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N-doped porous carbon material prepared from bean dregs and preparation method and application of material

A technology of nitrogen-doped porous carbon and bean dregs, applied in nano-carbon, electrical components, circuits, etc., can solve the problems of low surface area, poor energy storage, and low conductivity, and achieve good void structure and excellent performance , the effect of high nitrogen content

Pending Publication Date: 2019-10-08
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to solve the problems of low electrical conductivity, high cost, low agglomeration ratio surface, less voids and poor energy storage in existing biomass prepared porous nano-carbon materials, and to provide a method for utilizing Nitrogen-doped porous carbon material made of bean dregs and its preparation method and application

Method used

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  • N-doped porous carbon material prepared from bean dregs and preparation method and application of material
  • N-doped porous carbon material prepared from bean dregs and preparation method and application of material
  • N-doped porous carbon material prepared from bean dregs and preparation method and application of material

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Embodiment 1

[0035] A method for preparing a metal-air cathode dual-function catalyst from biomass residues, which specifically operates according to the following steps: weigh a certain amount of bean dregs (solid residues after soybean oil extraction), and soak in deionized water for 12 hours at room temperature; The soaked bean dregs and water are ground into soymilk at a mass ratio of 1:7. When the temperature is 80°C, nickel nitrate solution is added to form tofu gel; the obtained gel is freeze-dried, and the parameters of the freeze dryer are set as: The temperature is -55°C, the pressure is 0-150Pa; put it into a high-temperature furnace for heat treatment, and continue to pass inert gas: Among them, the heat treatment conditions are: in the high-temperature furnace, the temperature rises to 900°C at a rate of 5°C / min , the inert gas is nitrogen, the gas flow rate is 200mL / min, and the temperature is kept for 3h; the obtained product is washed with deionized water, centrifuged, and t...

Embodiment 2

[0037] A method for preparing a metal-air cathode dual-function catalyst from biomass residues, specifically operated according to the following steps: Weigh a certain amount of bean dregs (solid residues after oil pressing of soybeans), soak in deionized water for 24 hours at room temperature; The soaked bean dregs and water are ground into soymilk at a mass ratio of 1:7. When the temperature is 80°C, nickel nitrate solution is added to form tofu gel; the obtained gel is freeze-dried, and the parameters of the freeze dryer are set as: The temperature is -55°C, the pressure is 0-150Pa; put it into a high-temperature furnace for heat treatment, and continue to pass inert gas: Among them, the heat treatment conditions are: in the high-temperature furnace, the temperature rises to 900°C at a rate of 5°C / min , the inert gas is nitrogen, the gas flow rate is 200mL / min, and the temperature is kept for 3h; the obtained product is washed by centrifugation, and then dried.

Embodiment 3

[0039] A method for preparing a metal-air cathode dual-function catalyst from biomass residues, which specifically operates according to the following steps: weigh a certain amount of bean dregs (solid residues after soybean oil extraction), and soak in deionized water for 12 hours at room temperature; The soaked bean dregs and water are ground into soymilk at a mass ratio of 1:8. When the temperature is 80°C, nickel nitrate solution is added to form tofu gel; the obtained gel is freeze-dried, and the parameters of the freeze dryer are set as: The temperature is -55°C, the pressure is 0-150Pa; put it into a high-temperature furnace for heat treatment, and continue to pass inert gas: Among them, the heat treatment conditions are: in the high-temperature furnace, the temperature rises to 900°C at a rate of 5°C / min , the inert gas is nitrogen, the gas flow rate is 200mL / min, and the temperature is kept for 3h; the obtained product is washed by centrifugation, and then dried.

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Abstract

The invention discloses an N-doped porous carbon material prepared from bean dregs and a preparation method and application of the material. The preparation method of the method includes the steps ofpreparing bean dregs, soaking and grinding, adding 3d transition metal salt to form gel, freezing and drying in vacuum, performing high-temperature heat treatment to carbonize in inert gas, so as to obtain the 3d transition metal nano-particles embedded N-doped porous carbon material. The 3d transition metal nano-particles embedded N-doped porous carbon material prepared by the method has the advantages that, compared with the reported other biomass carbon materials, the material has high content of nitrogen, high degree of graphitization and good conductivity, and also has better oxygen reduction reaction (ORR) catalytic performance; besides, with embedding of the metal nano-particles having oxygen evolution reaction (OER) catalytic performance, double functionalization of the porous carbon material can be achieved, and the material can be applied to preparation of metal-air cell air cathode double-functional electrocatalysts. The preparation method has the advantages of simple operation, low cost and high availability in large-scale commercialized production.

Description

technical field [0001] The invention relates to a nitrogen-doped porous carbon material made from bean dregs, a preparation method and application thereof, and belongs to the field of cathode bifunctional electrocatalyst materials. Background technique [0002] Energy shortage and environmental pollution have aroused great concern in today's society, and finding clean and renewable energy has become a common concern of all countries. The use of various new energy sources requires the development of different types of energy storage devices to achieve efficient energy conversion and utilization. Metal-air batteries have high energy density and power density, and are ideal power battery systems for electric vehicles. Taking zinc-air batteries as an example, the cathode uses O in the air 2 As an active material; the specific energy of the battery depends on the capacity of the anode, and the theoretical energy density is as high as 1084Wh kg -1 , about 5 times that of curren...

Claims

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Application Information

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IPC IPC(8): C01B32/15B22F9/20H01M4/96
CPCC01B32/15B22F9/20H01M4/96Y02E60/50
Inventor 唐亚文汪晶晶李琦萱邱晓雨徐林孙冬梅
Owner NANJING NORMAL UNIVERSITY
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