A lignin-based transition metal-nitrogen-doped carbon material and its preparation and application

A transition metal and nitrogen-doped carbon technology, which is applied in the fields of material science and energy storage and conversion, can solve the problems of affecting oxygen reduction performance and agglomerating inactive metal particles, and achieve high-value utilization, simple preparation process and low price cheap effect

Active Publication Date: 2020-04-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used synthesis method is to physically mix metal, carbon source and nitrogen source, and carbonize to prepare transition metal-nitrogen doped carbon materials, which is easy to form agglomerated inactive metal particles, which affects the improvement of its oxygen reduction performance.

Method used

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  • A lignin-based transition metal-nitrogen-doped carbon material and its preparation and application
  • A lignin-based transition metal-nitrogen-doped carbon material and its preparation and application
  • A lignin-based transition metal-nitrogen-doped carbon material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Dissolve ferric chloride in water to obtain an aqueous ferric chloride solution with a concentration of 0.1g / mL; then add lignosulfonic acid (the mass ratio of lignosulfonic acid and ferric chloride is 1:2) to chlorine In the ferric chloride aqueous solution, stir evenly to obtain lignosulfonic acid / ferric chloride mixed solution;

[0044](2) Transfer the ligninsulfonic acid / ferric chloride mixture in step (1) to a hot water reactor, heat up to 180°C for hydrothermal treatment for 4 hours, cool to room temperature after the reaction, and wash the solid product with water and dry (60°C) to obtain a hydrothermal pre-carbonized product;

[0045] (3) Fully mix the pre-carbonized product and melamine at a mass ratio of 1:4, place in a tube furnace, heat up to 900°C for carbonization in an inert atmosphere (nitrogen) for 2 hours, and cool to room temperature after the reaction is complete. The carbonized product was washed with 1M hydrochloric acid solution, then washed ...

Embodiment 2

[0048] (1) Dissolve ferric chloride in water to obtain an aqueous ferric chloride solution with a concentration of 0.1g / mL; then add lignosulfonic acid (the mass ratio of lignosulfonic acid and ferric chloride is 1:2) to chlorine In the ferric chloride aqueous solution, stir evenly to obtain lignosulfonic acid / ferric chloride mixed solution;

[0049] (2) Transfer the ligninsulfonic acid / ferric chloride mixture in step (1) to a reaction kettle, place it in a muffle furnace, heat up to 180° C. for hydrothermal treatment for 4 hours, and cool to room temperature after the reaction is completed. Washing with water and drying at 60°C to obtain a hydrothermal pre-carbonized product;

[0050] (3) Fully mix the pre-carbonized product and melamine according to a mass ratio of 1:4, place in a tube furnace, heat up to 800°C for carbonization in an inert atmosphere (nitrogen) for 2 hours, and cool to room temperature after the reaction is completed. The carbonized product was washed with...

Embodiment 3

[0053] (1) Dissolve ferric chloride in water to obtain an aqueous ferric chloride solution with a concentration of 0.1g / mL; then add lignosulfonic acid (the mass ratio of lignosulfonic acid and ferric chloride is 1:2) to chlorine In the ferric chloride aqueous solution, stir evenly to obtain lignosulfonic acid / ferric chloride mixed solution;

[0054] (2) Transfer the ligninsulfonic acid / ferric chloride mixture in step (1) to a reaction kettle with a certain capacity, place it in a muffle furnace, heat up to 180° C. for hydrothermal treatment for 4 hours, and cool to room temperature after the reaction is completed. The solid product was washed with water and dried at 60°C to obtain a hydrothermal pre-carbonized product;

[0055] (3) Fully mix the pre-carbonized product and melamine at a mass ratio of 1:4, place in a tube furnace, heat up to 1000°C for carbonization in an inert atmosphere (nitrogen) for 2 hours, and cool to room temperature after the reaction is complete. The ...

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Abstract

The invention discloses a lignin-based transition metal / nitrogen doped carbon material, and preparation and application thereof, belonging to the technical field of carbon materials. A preparation method comprises the following steps: (1) uniformly mixing a transition metal salt with lignin in water to obtain a lignin / transition metal salt mixed liquid; (2) subjecting the lignin / transition metal salt mixed liquid to hydrothermal pre-carbonization so as to obtain a hydrothermal pre-carbonization product; and (3) mixing the hydrothermal pre-carbonization product with a nitrogen source, carryingout high-temperature carbonization in a protective atmosphere, and carrying out subsequent treatment so as to obtain the lignin-based transition metal / nitrogen doped carbon material. The lignin-basedtransition metal / nitrogen doped carbon material of the invention has excellent electrochemical performance; and the preparation process of the material is simple, raw materials are widely available and cheap, and an effective way is provided for the high-value utilization of biomass. The carbon material of the invention is applied to fields of fuel cells, supercapacitors, adsorbent materials, and / or water electrolysis.

Description

technical field [0001] The invention belongs to the fields of material science and energy storage and conversion, and specifically relates to a lignin-based transition metal-nitrogen-doped carbon material and its preparation and application. Background technique [0002] With the depletion of fossil resources and the increasingly prominent environmental problems, research on new energy conversion and storage devices with high energy efficiency and green environmental protection has attracted extensive attention. Due to the advantages of high energy conversion efficiency, no pollutant emission, and fast start-up speed, fuel cells have broad application prospects in the field of new energy. At present, the biggest challenge facing fuel cells is the high cost and poor durability of platinum catalysts used in large quantities. Therefore, the research and development of non-platinum catalysts with abundant resources, low price, excellent catalytic activity and stability has beco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02H01G11/30H01G11/32H01M4/90C25B1/04C25B11/06
CPCB01D2257/504B01J20/20B01J20/30C25B1/04C25B11/04H01G11/30H01G11/32H01M4/90H01M4/9083Y02C20/40Y02E60/13Y02E60/36Y02E60/50
Inventor 钟林新陈泽虹彭新文巫雅萧易基旺文睿罗青松
Owner SOUTH CHINA UNIV OF TECH
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