Radish-derived nitrogen-doped graded porous carbon and preparation method and application thereof

A hierarchical porous, nitrogen-doped technology, applied in chemical instruments and methods, structural parts, inorganic chemistry, etc., can solve problems such as hindering the transmission and diffusion of reactive substances, small specific surface area of ​​biochar, and destruction of biomass pore structure. Achieve the effect of low cost, high degree of graphitization, and simple operation of the preparation method

Inactive Publication Date: 2020-01-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochar prepared by these methods has relatively small specific surface area, low degree of graphitization, and destroys the natural pore structure of biomass.
[0005] These traditional porous carbon preparation methods have the following disadvantages: First, the high-temperature carbonization or activation process seriously destroys the natural pore structure of biomass, hindering the transport and diffusion of reactive substances.
Second, the high temperature carbonization or activation process leads to the loss of nitrogen content in carbon
Third, after a series of high-temperature treatment processes, due to the generation and release of carbon dioxide, the yield of biochar is low, resulting in the waste of carbon resources and exacerbating the greenhouse effect
Therefore, the specific surface area of ​​the prepared biochar is relatively small, the degree of graphitization is low, and the natural pore structure of the biomass is destroyed.

Method used

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  • Radish-derived nitrogen-doped graded porous carbon and preparation method and application thereof
  • Radish-derived nitrogen-doped graded porous carbon and preparation method and application thereof
  • Radish-derived nitrogen-doped graded porous carbon and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Wash the radish and dry it, then grind and pulverize it, then soak the radish powder with a saturated solution of sodium chloride, zinc chloride and ferric chloride, place it in a water-heated oven at 190°C for 12 hours, and then wash it with deionized water. After drying, carbon solid powder was obtained; the carbon solid powder obtained above was mixed with KOH solid powder at a mass ratio of 1:2, and then activated with potassium hydroxide at 550°C for 2 hours; then washed and deionized with 3mol / L hydrochloric acid The porous carbon was obtained by washing with water to neutrality and drying to obtain porous carbon; the porous carbon was placed in a tube furnace under an ammonia atmosphere and heated to 900 °C at 5︒ / min, kept for 2 hours, and naturally cooled to room temperature to obtain radish-based porous carbon.

[0036] The radish-derived nitrogen-doped hierarchical porous carbon prepared in Example 1 has a sheet-like structure, such as figure 1As shown, and ha...

Embodiment 2

[0038] Wash the radish and dry it, then grind and pulverize it, then soak the radish powder in a saturated solution of sodium chloride, zinc chloride and ferric chloride, dry it at room temperature and place it in a tube furnace for 3 hours at 400°C, and for 2 hours at 700°C , naturally cooled to room temperature to obtain a carbonized product; the carbonized product obtained above was mixed with KOH solid powder at a mass ratio of 1:2, and then activated with potassium hydroxide at 550°C for 2 hours; then washed with 3 mol / L hydrochloric acid and The porous carbon was obtained by washing with deionized water to neutrality and then drying. The porous carbon was placed in a tube furnace under an ammonia atmosphere and heated to 900 °C at 5 °C / min, kept for 2 h, and cooled naturally to room temperature to obtain a radish-based porous carbon.

[0039] The radish-derived nitrogen-doped hierarchical porous carbon prepared in Example 2 has a sheet-like structure, such as Figure 5 A...

Embodiment 3

[0041] Step 1: Weigh 5 mg of radish-based porous carbon prepared in Example 1 and disperse it into 1 mL of ethanol solution, sonicate for 30 min, add 50 µL of Nafion membrane solution to mix, and then sonicate for 10 min to prepare a catalyst solution. Take 10 µL of the catalyst solution prepared in step 1, and evenly spin-coat it on the glassy carbon electrode to obtain the electrode to be tested.

[0042] The test electrode of the commercial platinum-on-carbon catalyst was prepared by the method of step 1.

[0043] Step 2: The electrode prepared in step 1 was used as the working electrode, the carbon rod was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode to assemble a three-electrode system for electrochemical performance testing. 0.1 mol / L KOH solution was used as the electrolyte. Such as Figure 6 As shown, the radish-based porous carbon exhibits excellent catalytic activity for oxygen reduction, which is superior to...

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Abstract

The invention relates to a radish-derived nitrogen-doped graded porous carbon and a preparation method and application thereof. Radishes and other agricultural products are used as main raw materials,crushed and immersed in a saturated water solution of activators such as sodium chloride, zinc chloride and ferric chloride, hydrothermal carbonization or direct carbonization is carried out, and then activating is carried out to finally obtain the nitrogen-doped graded porous carbon. According to the graded porous carbon, the natural porous structure of radish is retained, the characteristics ofhigh graphitization and high nitrogen doping level are achieved, and the radish-derived nitrogen-doped graded porous carbon is suitable for electrode materials of new energy systems such as fuel cells, lithium ion batteries and super capacitors..

Description

technical field [0001] The invention belongs to the field of biomass energy, and in particular relates to nitrogen-doped hierarchical porous carbon derived from radish and its preparation method and application. Background technique [0002] Energy is the most basic driving force for human survival and development in the new century. However, with the depletion of fossil fuels and the intensification of environmental pollution, advanced energy conversion and storage technology is one of the major problems that need to be solved urgently in the world today. common problems. With the discovery and utilization of more new energy sources, such as solar energy, wind energy, tidal energy, biomass energy, etc., the demand for an energy storage and conversion device is also greatly increased. Fuel cells, lithium-ion batteries, and supercapacitors have high energy density and are commonly used energy storage devices. [0003] Porous carbon materials are widely used electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/24H01G11/34H01G11/44H01M4/583H01M4/96
CPCC01B32/318C01B32/348H01G11/24H01G11/34H01G11/44H01M4/583H01M4/96Y02E60/10Y02E60/13Y02E60/50
Inventor 刘景军王楠王峰赵静
Owner BEIJING UNIV OF CHEM TECH
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