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Lignin-based transition metal/nitrogen doped carbon material, and preparation and application thereof

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

Active Publication Date: 2018-12-18
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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  • Lignin-based transition metal/nitrogen doped carbon material, and preparation and application thereof
  • Lignin-based transition metal/nitrogen doped carbon material, and preparation and application thereof
  • Lignin-based transition metal/nitrogen doped carbon material, and preparation and application thereof

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) into chlorine Stir evenly in the iron solution aqueous solution to obtain a lignosulfonic acid / iron chloride mixture;

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

[0045] (3) Fully mix the pre-carbonized product and melamine according to the mass ratio of 1:4, place in a tube furnace, heat up to 900°C in an inert atmosphere (nitrogen) for carbonization 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) into chlorine Stir evenly in the iron solution aqueous solution to obtain a lignosulfonic acid / iron chloride mixture;

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

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

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) into chlorine Stir evenly in the iron solution aqueous solution to obtain a lignosulfonic acid / iron chloride mixture;

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

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

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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 received extensive attention. Due to the advantages of high energy conversion efficiency, no pollutant emissions, and fast startup 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 caused by the extensive use of platinum catalysts. Therefore, research and development of non-platinum catalysts with abundant resources, low prices, excellent catalytic activity and stability has become one...

Claims

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Application Information

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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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