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Preparation method and application of nitrogen-doped porous biomass carbon

A biomass carbon and nitrogen doping technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of complex preparation process, unsuitable for large-scale commercial application, etc., and achieve improved pore structure, stability and methanol resistance. The effect of improving the sex and increasing the surface area

Inactive Publication Date: 2020-02-28
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the electrocatalytic oxygen reduction performance of some non-noble metal-doped carbon materials has surpassed that of platinum-based catalysts. Although its price is cheaper than platinum, it is still high, and the preparation process is complicated and not suitable for large-scale commercial applications.

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  • Preparation method and application of nitrogen-doped porous biomass carbon
  • Preparation method and application of nitrogen-doped porous biomass carbon
  • Preparation method and application of nitrogen-doped porous biomass carbon

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preparation example Construction

[0032] The invention provides a method for preparing nitrogen-doped porous biomass carbon, comprising the following steps:

[0033] Biomass chitosan was sequentially exposed to inert gas atmosphere, CO 2 Atmosphere and NH 3 Pyrolysis is carried out in the atmosphere to obtain nitrogen-doped porous biomass carbon.

[0034]In the preparation method provided by the invention, firstly, biomass chitosan is pyrolyzed in an inert gas atmosphere. Wherein, the relative molecular mass of the biomass chitosan is preferably 300,000 to 1,000,000 Da, specifically 300,000 Da, 350,000 Da, 400,000 Da, 450,000 Da, 500,000 Da, 550,000 Da, 594,000 Da, 600,000 Da, 650,000 Da, 700,000 Da, 750,000 Da, 0,090,000 Da, 800,000 950000Da or 1000000Da; the particle size of the biomass chitosan is preferably >400 mesh; the deacetylation degree of the biomass chitosan is preferably 80-95%. In the present invention, the biomass chitosan is preferably dried and ball milled before being pyrolyzed. Wherein, ...

Embodiment 1

[0046] (1) Pretreatment: Put the biomass chitosan in an oven at 80°C for 24 hours to remove the moisture in the biomass; in order to make the distribution of biomass chitosan particles more uniform, dry it and place it in a ball mill After ball milling for 15 hours, the grinding bodies are 50 agate balls with a diameter of 3 mm, and the particle size of the biomass chitosan after ball milling is >400 mesh.

[0047] (2) Pyrolytic carbonization: Get 5g of pretreated chitosan and place it in a slow pyrolysis furnace. First, under an inert atmosphere Ar, reach 500°C with a heating rate of 5°C / min and keep for 2h; then, turn to CO 2 The atmosphere reaches 800°C at a heating rate of 10°C / min and keeps for 2 hours; finally, it is converted to NH 3 The atmosphere is kept at 800°C for 2 hours to obtain nitrogen-doped porous biomass carbon, denoted as N / C 800-800 or N / C 800-800 (CO 2 -NH 3 ).

Embodiment 2

[0049] (1) Pretreatment: Put the biomass chitosan in an oven at 80°C for 24 hours to remove the moisture in the biomass; in order to make the distribution of biomass chitosan particles more uniform, dry it and place it in a ball mill After ball milling for 15 hours, the grinding bodies are 50 agate balls with a diameter of 3 mm, and the particle size of the biomass chitosan after ball milling is >400 mesh.

[0050] (2) Pyrolytic carbonization: Get 5g of pretreated chitosan and place it in a slow pyrolysis furnace. First, under an inert atmosphere Ar, reach 500°C with a heating rate of 5°C / min and keep for 2h; then, turn to CO 2 The atmosphere reaches 700°C at a heating rate of 10°C / min and maintains for 2h; finally changes to NH 3 The atmosphere is kept at 700°C for 2 hours to obtain nitrogen-doped porous biomass carbon, denoted as N / C 700-700 .

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Abstract

The invention belongs to the field of fuel cell electro-catalytic materials, and particularly relates to a preparation method and an application of a nitrogen-doped porous biomass carbon. The preparation method provided by the invention comprises the step of sequentially pyrolyzing biomass chitosan in inert gas, CO2 and NH3 atmospheres to obtain the nitrogen-doped porous biomass carbon, wherein the heating rates of pyrolysis in the inert gas, CO2 and NH3 atmospheres are 3-7 DEG C / min, 8-15 DEG C / min and 8-15 DEG C / min in sequence, the heating endpoint temperatures are 400-600 DEG C, 700-800 DEG C and 700-900 DEG C in sequence, and the heat preservation time is 1-3 hours, 1-8 hours and 1-8 hours in sequence. According to the preparation method disclosed by the invention, proper pyrolysis temperatures and pyrolysis atmospheres are optimally designed, so that the prepared nitrogen-doped porous biomass carbon has very excellent electro-catalytic oxygen reduction performance, stability andmethanol resistance, and has a wide application prospect in the field of fuel cell electro-catalytic materials.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials for fuel cells, and in particular relates to a preparation method and application of nitrogen-doped porous biomass carbon. Background technique [0002] With the increasingly serious problem of environmental pollution and the increasing consumption of traditional fossil fuels, the development of clean, efficient and sustainable energy has become an important research topic for scientists today. A fuel cell is a device that can directly convert the chemical energy of fuel into electrical energy. It has the advantages of high energy conversion efficiency, abundant fuel sources, and low pollution. It has become the most promising new green energy technology. Nowadays, with the rapid development of the new energy automobile industry, people urgently need to develop a green, economical and high-performance fuel cell for automobile power. Among them, the electrocatalyst is a key part of the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8882H01M4/90Y02E60/50
Inventor 江鸿叶雨阳
Owner UNIV OF SCI & TECH OF CHINA
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