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A preparation method of a high specific surface area Fe-N-C catalyst

An iron-nitrogen-carbon catalyst with a high specific surface area technology, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of complex preparation process and low oxygen reduction initial potential, and achieve simple preparation process, high reduction catalytic activity, good stability effect

Active Publication Date: 2018-12-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a high specific surface area iron-nitrogen-carbon catalyst to solve the complex preparation process of the catalyst used in fuel cell cathode oxygen reduction in the prior art, and the initial oxygen reduction Technical problem with low potential

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh iron source (ferrocene), be dissolved in carbon nitrogen source (acetonitrile) solution, iron source and carbon nitrogen source mass ratio are 1:20; Gained raw material solution is input in vertical tubular furnace through electronic peristaltic pump, The reaction temperature was set at 500°C, and the heating rate was 15°C / min. The input speed of the peristaltic pump is 250mL / h and nitrogen gas is fed at the same time, the flow rate is 40L / h, the raw material solution is gasified and thermally decomposed to form nano-clusters in the high-temperature zone of the tube furnace; after thermal decomposition, the nano-clusters form nitrogen-doped carbon packages The iron nano core-shell particle product is collected in the collector at the end of the tube furnace; the obtained nitrogen-doped carbon-coated iron nano core-shell particle is placed in an aqueous regia solution, heated and stirred at 30°C for 10h, filtered, and deionized water The residual aqua regia solutio...

Embodiment 2

[0021] Weigh the iron source (iron acetylacetonate) and dissolve it in the carbon and nitrogen source (pyrrole) solution. The mass ratio of the iron source to the carbon and nitrogen source is 4:1; the raw material solution is input into the vertical tube furnace through an electronic peristaltic pump, The reaction temperature was set at 900°C, and the heating rate was 10°C / min. The input speed of the peristaltic pump is 80mL / h, and the nitrogen gas is fed at the same time, the flow rate is 120L / h, the raw material solution is gasified in the high temperature zone of the tube furnace and thermally decomposed to form nano-clusters; after thermal decomposition, the nano-clusters form nitrogen-doped carbon packages The iron nano core-shell particle product is collected in the tail collector of the tube furnace; the obtained nitrogen-doped carbon-coated iron nano core-shell particle is placed in an aqueous regia solution, heated and stirred at 70°C for 6h, filtered, and deionized w...

Embodiment 3

[0024] Weigh the iron source (iron acetylacetonate) and dissolve it in the carbon and nitrogen source (pyrrole) solution. The mass ratio of the iron source to the carbon and nitrogen source is 2:1; the raw material solution is input into the vertical tube furnace through an electronic peristaltic pump, The reaction temperature was set at 1300°C, and the heating rate was 5°C / min. The input speed of the peristaltic pump is 10mL / h and the nitrogen gas is fed at the same time, the flow rate is 320L / h, the raw material solution is gasified in the high temperature zone of the tube furnace and thermally decomposed to form nano-clusters; after thermal decomposition, the nano-clusters form nitrogen-doped carbon packages The iron nano core-shell particle product is collected in the collector at the end of the tube furnace; the obtained nitrogen-doped carbon-coated iron nano core-shell particle is placed in an aqueous regia solution, heated and stirred at 90°C for 2h, filtered, and deioni...

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Abstract

The invention provides a preparation method of a high specific surface area Fe-N-C catalyst, wherein an iron source is weighed and dissolved in a solution of a carbon source and a nitrogen source to prepare a solution; At that same time, the protect gas is introduced into the vertical tube furnace through an electronic peristaltic pump, and the raw material solution is gasify in the high-temperature region of the tube furnace and thermally decomposed to form nano clusters; At that end of thermal decomposition, the nanocluster form nitrogen-doped carbon-coated iron nano-core-shell particle product, which is collected in a collector at the tail of a tubular furnace; The obtained nitrogen-doped carbon-coated iron nano core-shell particles are placed in aqua regia, heated and stirred, filteredand ished with deionized water; The obtained catalyst is dried and then heated in a vacuum environment, and the catalyst is cooled in a furnace to obtain a high specific surface area iron nitride carbon catalyst. The iron-nitrogen-carbon catalyst of the invention has the advantages of simple synthesis method, easy raw material obtaining, easy operation, good product stability, high catalytic activity for oxygen reduction, and can be used as a fuel cell cathode catalyst, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and relates to a synthesis method of a fuel cell cathode oxygen reduction catalyst, in particular to a preparation method of a high specific surface area iron-nitrogen-carbon catalyst. Background technique [0002] Fuel cell (Fuel cell) has the advantages of high conversion efficiency and environmental protection. It is one of the most promising power generation technologies. However, the current commercialization still faces the problems of high cost and poor performance. The main reason that the actual energy conversion efficiency is lower than the theoretical value is the dynamic polarization and mass transfer polarization loss. Among them, the catalytic activity of the catalyst for the oxygen reduction reaction at the cathode is much lower than that of the oxidation reaction at the anode, even for the commercialized noble metal platinum catalyst. The low catalytic act...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9041H01M4/9083Y02E60/50
Inventor 盛赵旻甘祖忠黄欢李娜娜赵文杰李舒
Owner SHANGHAI INST OF TECH