Preparation method and application of iron-nitrogen-carbon catalyst

A carbon catalyst and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of transition metal precursors and nitrogen sources without coordination structures, complex phase composition of catalysts, and difficulty in analyzing active centers, etc., to achieve Good stability and methanol poisoning resistance, excellent oxygen reduction catalytic performance, and simple preparation process

Inactive Publication Date: 2019-02-26
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) The commonly used transition metal precursors and nitrogen sources do not have a clear coordination structure before heat treatment, and often require a heat treatment process to form the active center of the coordination structure, and this process is uncontrollable
[0005] 2) High-temperature heat treatment often leads to complex phase composition in the catalyst, and it is difficult to analyze the specific active center, which limits the preparation method of the catalyst and is not universal
[0006] 3) The traditional preparation process requires high-temperature heat treatment, which leads to a low yield of the synthesized catalyst, usually at the milligram level, and the performance tends to decline after directly expanding the output

Method used

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  • Preparation method and application of iron-nitrogen-carbon catalyst
  • Preparation method and application of iron-nitrogen-carbon catalyst
  • Preparation method and application of iron-nitrogen-carbon catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Put 500 mg of pretreated commercial charcoal powder in a beaker, and add 200 mL of isopropanol to the beaker, and stir for 5 hours; then place 300 mg of iron phthalocyanine in another beaker, and add to this beaker 200 mL of tetrahydrofuran solution, stirred for 5 hours. The well-dispersed iron phthalocyanine solution was slowly added to the isopropanol solution dispersed with the carbon carrier, stirred ultrasonically rapidly for half an hour, and then the stirred mixture was stirred and dispersed at room temperature for 6 h. Then the obtained mixture solution was subjected to rotary evaporation at 40 °C until the solution was evaporated to dryness and the product was viscous. Afterwards, the viscous material was put into an oven at 80° C. and dried overnight to obtain an intermediate product for preparing the catalyst precursor.

[0034] The precursor obtained above was heat-treated at 400 °C with a heating rate of 2 °C min -1 , the holding time was 2 h, and the iro...

Embodiment 2

[0038] The operating conditions are the same as in Example 1, except that the added amount of iron phthalocyanine is 100 mg.

[0039] The iron-nitrogen-carbon oxygen reduction catalyst was thus prepared, and the half-wave potential of the oxygen reduction polarization curve was 0.88 V (vs. RHE), and the limiting diffusion current density was 5.19 mA cm -2 , the number of transferred electrons is 4.0, and it has good electrochemical stability and anti-methanol poisoning performance.

Embodiment 3

[0041] The operating conditions are the same as in Example 1, except that the amount of iron phthalocyanine added is 400 mg.

[0042] The iron-nitrogen-carbon oxygen reduction catalyst was thus prepared, and the half-wave potential of the oxygen reduction polarization curve was 0.85 V (vs. RHE), and the limiting diffusion current density was 5.83 mA cm -2 , the number of transferred electrons is 4.0, and it has good electrochemical stability and anti-methanol poisoning performance.

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Abstract

The invention relates to a preparation method and application of an iron-nitrogen-carbon catalyst; iron phthalocyanine is used as a precursor of a transition metal and a nitrogen source, commercial porous charcoal is used as a carbon carrier, an intermediate product is obtained by impregnation and adsorption, and then the iron-nitrogen-carbon catalyst is prepared by low temperature heat treatment.The method provided by the invention has the advantages of simple preparation process, easy control, low heat treatment temperature, and clear composition structure of the synthesized catalyst, and can achieve mass production of gram-grade scale. The prepared iron-nitrogen-carbon catalyst has excellent catalytic performance for oxygen reduction, and has good stability and anti-methanol poisoningperformance.

Description

technical field [0001] The invention belongs to the field of preparation of fuel cell oxygen reduction catalytic materials, and in particular relates to a preparation method of an iron-nitrogen-carbon catalyst and its application in fuel cell cathode oxygen reduction. Background technique [0002] With the rapid development of the world's economy and culture, human beings' demand for energy is increasing day by day. However, with the excessive exploitation of fossil energy, energy crisis and environmental pollution have become the focus of human society today. We seek to develop clean and efficient renewable energy, including wind energy, hydrogen energy, solar energy and other green energy sources that have attracted people's attention. When people develop new energy sources, they usually need to convert these clean energy sources into the electric energy we need through energy conversion devices. A fuel cell is a device that can directly convert chemical energy into elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 王峰张正平覃业深俞溢欢窦美玲闵小建肖荣林王文婧王小宪吴浩波
Owner BEIJING UNIV OF CHEM TECH
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