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Preparation method of nitrogen doped biomass porous carbon and oxygen reduction catalyzing application of nitrogen doped biomass porous carbon

A technology of porous carbon and nitrogen doping, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low stability, limitation, deactivation, etc., and achieve excellent electrocatalytic performance , good cycle life and high current density

Inactive Publication Date: 2019-04-05
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts are expensive and not suitable for large-scale civilian use, and noble metal catalysts have harsh requirements on the use environment, and are easily poisoned by other substances to cause deactivation
Wider application of catalysts has always been limited by their high cost and low stability

Method used

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  • Preparation method of nitrogen doped biomass porous carbon and oxygen reduction catalyzing application of nitrogen doped biomass porous carbon
  • Preparation method of nitrogen doped biomass porous carbon and oxygen reduction catalyzing application of nitrogen doped biomass porous carbon
  • Preparation method of nitrogen doped biomass porous carbon and oxygen reduction catalyzing application of nitrogen doped biomass porous carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0031] After cleaning and drying the collected discarded cantaloupe peels, the temperature was raised to 400°C at a heating rate of 5°C / min in a nitrogen atmosphere, and then carbonized at 400°C for 2 hours to obtain biochar; the biochar was mixed with melamine, Potassium bicarbonate was put into a planetary ball mill at a mass ratio of 1 : 3 : 3, processed at a speed of 300 rpm for 30 min, and forward and reverse 15 min each; in a nitrogen atmosphere, the temperature was raised to 800 °C at a rate of 2 °C / min. ℃ for synergistic doping-activation to obtain un-acid-washed nitrogen-doped biomass porous carbon; the obtained un-acid-washed nitrogen-doped cantaloupe porous carbon was placed in a magnetic stirrer with 1 mol L -1 hydrochloric acid at 400 rpm and 50°C for 2 h, then washed with water until neutral, dried at 80°C and ground into fine particles for storage. The product is nitrogen-doped biomass porous carbon.

Embodiment 2

[0033]After cleaning and drying the collected discarded cantaloupe peels, the temperature was raised to 400°C at a heating rate of 5°C / min in a nitrogen atmosphere, and then carbonized at 400°C for 2 hours to obtain biochar; the biochar was mixed with melamine, Potassium bicarbonate was put into a planetary ball mill at a mass ratio of 1:3:3, and processed at a speed of 300 rpm for 30 minutes, with forward and reverse rotations each for 15 minutes; in a nitrogen atmosphere, the temperature was raised to 900 °C at a rate of 2 °C / min. ℃ for synergistic doping-activation to obtain un-acid-washed nitrogen-doped biomass porous carbon; the obtained un-acid-washed nitrogen-doped cantaloupe porous carbon was placed in a magnetic stirrer with 1 mol L -1 hydrochloric acid at 400 rpm and 50°C for 2 h, then washed with water until neutral, dried at 80°C and ground into fine particles for storage. The product is nitrogen-doped biomass porous carbon.

Embodiment 3

[0035] After cleaning and drying the collected discarded cantaloupe peels, the temperature was raised to 400°C at a heating rate of 5°C / min in a nitrogen atmosphere, and then carbonized at 400°C for 2 hours to obtain biochar; the biochar was mixed with melamine, Potassium bicarbonate was put into a planetary ball mill at a mass ratio of 1:1:3, and processed at a speed of 300 rpm for 30 minutes, with forward and reverse rotations each for 15 minutes; in a nitrogen atmosphere, the temperature was raised to 800 °C at a rate of 2 °C / min. ℃ for synergistic doping-activation to obtain un-acid-washed nitrogen-doped biomass porous carbon; the obtained un-acid-washed nitrogen-doped cantaloupe porous carbon was placed in a magnetic stirrer with 1 mol L -1 hydrochloric acid at 400 rpm and 50°C for 2 h, then washed with water until neutral, dried at 80°C and ground into fine particles for storage. The product is nitrogen-doped biomass porous carbon.

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Abstract

The invention discloses a preparation method of a nitrogen doped biomass porous carbon and oxygen reduction catalyzing application of the nitrogen doped biomass porous carbon. The application method of the nitrogen doped biomass porous carbon comprises taking hami melon peel as the raw material, processing low-temperature pre-carbonated biomass carbon together with a nitrogen source of melamine and an activating agent of potassium bicarbonate, then performing synchronous activation and doping at high temperature, and lastly performing acid pickling, washing and drying treatment to achieve preparation of a proton exchange membrane fuel battery cathode catalyzing material high in specific surface area and nitrogen content. The prepared oxygen reduction catalyzing material is excellent in electrochemical performance and high in catalytic activity and stability as well as methanol tolerance; the waste hami melon peel serving as the raw material is low in cost; no toxic or highly corrosiveagents are involved during preparation, so that the application method is environmentally friendly, simple, efficient and applicable to large-scale production and achieves certain practical significance and application value.

Description

technical field [0001] The present invention relates to a preparation method of nitrogen-doped biomass porous carbon and its application in oxygen reduction catalysis, in particular to a preparation method of nitrogen-doped biomass porous carbon material using Hami melon rind as raw material and its application in oxygen reduction catalysis Applications belong to the field of new energy materials. Background technique [0002] Oxygen reduction reaction is an important electrochemical reaction closely related to energy conversion and energy storage technology. It is widely used in fuel cells, metal-air batteries, electrolysis of water and other fields. However, the oxygen reduction process is generally slow and requires the use of a large number of noble metal catalysts to speed up the reaction process, such as using Pt or Ir to increase the activity of the oxygen reduction reaction. At present, 5% or 20% Pt / C is often used as a catalyst in commerce. . However, these catal...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10
CPCB01J27/24B01J35/33B01J35/61
Inventor 徐朗白沛瑶张文都王会芬齐佳伟
Owner CHINA UNIV OF MINING & TECH
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