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Preparation of fe-n-c mesoporous carbon materials and their application in oxygen reduction reaction

A mesoporous carbon, fe-n-c technology, applied in the direction of physical/chemical process catalysts, structural parts, chemical instruments and methods, etc., can solve the problems of limiting fuel cell applications, limiting large-scale production, and expensive prices The effect of hydrogen oxide production, good resistance to methanol poisoning, and high current density

Active Publication Date: 2019-03-12
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high overpotential of the oxygen reduction reaction at the cathode severely limits its large-scale production.
[0003] Traditional noble metals such as Pt or Pd, as catalysts for fuel cell cathode oxygen reduction, have a small overpotential, but because of their high price and poor stability, they also limit the application of fuel cells to a certain extent.

Method used

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  • Preparation of fe-n-c mesoporous carbon materials and their application in oxygen reduction reaction
  • Preparation of fe-n-c mesoporous carbon materials and their application in oxygen reduction reaction
  • Preparation of fe-n-c mesoporous carbon materials and their application in oxygen reduction reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Accurately weigh 10g Tris, 1g CA, and 1g FeCl 3 , grind and mix well to obtain a homogeneous yellow mixture. Then put the yellow mixture in a corundum boat (2*8*2cm) and put it in a blast drying oven (the temperature is set at 150°C, the maintenance time is 3 hours, and the air is not isolated), and a yellow-brown gel is obtained. thing.

[0033] 2) Heat the yellow jelly in a tube furnace at high temperature (heating rate 2.5°C / min, heating temperature 850°C) and maintain it for two hours to obtain a dark brown jelly, which is the initial iron-nitrogen-carbon composite Material. During the process of high temperature heating and temperature rise, the tube furnace kept feeding nitrogen.

[0034] 3) Put the composite material obtained in step 2) into 0.5mol / L sulfuric acid and treat it for 12 hours. During the treatment, stir it with a magnet at a stirring rate of 550rpm / min. Filtered and washed three times with double distilled water, dried for later use. Accordi...

Embodiment 2

[0037] The experimental procedure is the same as that of Example 1, except that the heating temperature in experimental procedure 2) is 750°C, and Fe-N-C-750 is prepared. The characterization method (SEM, TEM) is the same as in Example 1, and the electrochemical test method (CV, LSV) is also the same as in Example 1.

Embodiment 3

[0039] The experimental procedure is the same as that of Example 1, except that the heating temperature in experimental procedure 2) is 750°C, and Fe-N-C-950 is prepared. The characterization method (SEM, TEM) is the same as in Example 1, and the electrochemical test method (CV, LSV) is also the same as in Example 1.

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Abstract

The invention proposes a method for preparing Fe-N-C mesoporous carbon materials, which includes the steps of: mixing tris, template agent, and iron source, and grinding them thoroughly to distribute and mix them evenly, and then mix the mixture Heating at 100~200℃, the heated product is heated at high temperature at 700~950℃ for 2~4 hours; the material obtained after high temperature treatment is acidified in H2SO4 solution and treated with ion-free water. Wash with water several times and dry. The present invention successfully synthesizes Fe-N-C, a highly efficient catalyst for oxygen reduction, from cheap precursors. Through comparison and optimization of the preparation process, the appropriate high-temperature heating temperature was determined. The prepared catalyst has many advantages, such as higher electron transfer number, lower hydrogen peroxide production, larger current density and good methanol resistance. Poison ability.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a redox electrocatalytic material with a mesoporous structure. Background technique [0002] A fuel cell is a power generating device that directly converts the chemical energy present in fuel and oxidant into electrical energy. In recent years, with the continuous development of the economy, people's demand for fuel cells is increasing. Fuel cells are widely used in automobiles, space shuttles, submarines, underwater robots, communication systems, small and medium-sized power stations, and household power supplies, and have the characteristics of high efficiency, no pollution, short construction period, easy maintenance, and low cost. However, the high overpotential of the oxygen reduction reaction at the cathode severely limits its large-scale production. [0003] Traditional noble metals such as Pt or Pd, as catalysts for fuel cell cathode oxygen reduction, have a small ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24H01M4/90
CPCH01M4/9083B01J27/24B01J35/33Y02E60/50
Inventor 林雨青何传生张亭亭孙凤展
Owner CAPITAL NORMAL UNIVERSITY
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