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Preparation method of nitrogen-doped porous carbon material based on citric acid transition/alkali metal complex salt

A technology of alkali metal complexes and nitrogen-doped porous carbon, which is applied in the preparation/purification of carbon, electrical components, battery electrodes, etc., can solve the complex structure and preparation process of metal complexes, expensive ligands, difficult It has been popularized to achieve excellent oxygen reduction catalytic performance and stability, promote electrocatalytic activity, and simplify the production process.

Inactive Publication Date: 2018-07-27
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure and preparation process of metal complexes are generally more complicated, and the ligands are more expensive, so it is difficult to be popularized in large-scale preparation and use.

Method used

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  • Preparation method of nitrogen-doped porous carbon material based on citric acid transition/alkali metal complex salt
  • Preparation method of nitrogen-doped porous carbon material based on citric acid transition/alkali metal complex salt
  • Preparation method of nitrogen-doped porous carbon material based on citric acid transition/alkali metal complex salt

Examples

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Effect test

Embodiment 1

[0032] Weigh 5g of ferric citrate and put it into an alumina porcelain boat, then put the porcelain boat into a resistance tube furnace, and inject ammonia gas after vacuuming. Set the heating rate at 5°C / min, and keep at 600°C for 2 hours. After the reaction, the obtained product was etched with 2.5 mol / L hydrochloric acid aqueous solution to remove metal impurities, then washed with water until neutral, and freeze-dried to obtain a nitrogen-doped porous carbon material.

Embodiment 2

[0034] Weigh 5g of ferric citrate and put it into an alumina porcelain boat, then put the porcelain boat into a tube furnace, and feed ammonia gas after vacuuming. Set the heating rate at 10°C / min, and keep at 900°C for 4 hours. After the reaction, the obtained product was etched with 5 mol / L hydrochloric acid aqueous solution to remove metal impurities, then washed with water until neutral, and freeze-dried to obtain a nitrogen-doped porous carbon material.

Embodiment 3

[0036] Weigh 5g of ferric citrate and put it into an alumina porcelain boat, then put the porcelain boat into a tube furnace, and inject a mixed gas of ammonia and nitrogen after vacuumizing. Set the heating rate at 0.5°C / min, and keep at 600°C for 4 hours. After the reaction, the obtained product was etched with 2.5 mol / L hydrochloric acid aqueous solution to remove metal impurities, then washed with water until neutral, and freeze-dried to obtain a nitrogen-doped porous carbon material.

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Abstract

The invention provides a preparation method of a nitrogen-doped porous carbon material based on citric acid transition / alkali metal complex salt. The preparation method comprises the following steps:taking the citric acid transition / alkali metal complex salt as a carbon source, in the atmosphere containing ammonia gas, performing heat treatment for 1-24h under the temperature of 500-1,000 DEG C;after cooling, performing acid washing to remove impurities such as metal, and then washing with water to remove excess acid solution to neutral, and obtaining the nitrogen-doped porous carbon material after drying. The preparation method provided by the invention is simple and no pore-forming agent is needed, the preparation method is easy to operate, raw materials are wide in source, the methodis green and environmentally friendly, low in cost, is beneficial to realize larger-scale industrialized production, the prepared nitrogen-doped porous carbon material has the advantages that the nitrogen-doped porous carbon material has a multi-stage hole structure, a lamellar structure containing holes and has obvious graphite lattice fringes, the specific surface area is large, and the nitrogen-doped porous carbon material is rich in nitrogen heteroatoms and oxygen reduction activity point locations, has the good electrical catalysis oxygen reduction performance and stable performance, canbe used for preparing electricity catalysis oxygen reduction electrode and other catalyst carriers.

Description

technical field [0001] The invention belongs to the field of inorganic material synthesis, and in particular relates to a method for preparing nitrogen-doped porous carbon materials based on citric acid transition / alkali metal complex salts. Background technique [0002] Proton exchange membrane fuel cells have attracted widespread attention due to their high energy conversion rate and the fact that they do not produce pollution when generating electricity. However, due to the slow oxygen reduction reaction at the cathode of the battery, the output power of the fuel cell is restricted, and a catalyst is needed to increase the reaction rate to increase the output power of the battery. Currently, the commonly used catalyst is a PtC catalyst containing a large amount of platinum (Pt) metal. Due to the low abundance of Pt metal in the earth's crust, its high price and easy poisoning, the commercial scale application of fuel cells is seriously restricted. There are two main solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/88H01M4/90
CPCH01M4/88H01M4/9041H01M4/9083Y02E60/50
Inventor 陈德良李涛孙成华杨震宇徐勇军尹辉斌傅小波康世民李超周亚明廖俊旭涂军令
Owner DONGGUAN UNIV OF TECH
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