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Preparation method of S doped Fe/N/C catalyst

A solution and concentration technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problem of low catalytic activity of oxygen reduction, and achieve the effect of large specific surface area, significant catalytic activity, and huge market prospects

Inactive Publication Date: 2018-10-02
QIDONG CHUANGLYU GREENING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the original carbon materials have very low catalytic activity for oxygen reduction, such as graphene, carbon nanotubes, carbon black, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of S-doped Fe / N / C catalyst, comprising the steps of: dispersing 25 parts of melamine powder and 11 parts of formaldehyde solution with a mass fraction of 37% in 65 parts of deionized water, adding a concentration of 0.1mol / L NaOH solution, adjust the pH value of the solution to 9.5, stir in a water bath at 65°C for 2 hours, add HCl solution with a concentration of 1mol / L, adjust the pH value of the solution to 5.5, and when the solution becomes white and turbid, add 1 part of chloride Calcium powder and 15 parts of FeCl with a concentration of 1mol / L 3 Add 8 parts of potassium thiocyanate to the aqueous solution, raise the temperature to 82°C and stir for 28 hours, then stir and heat at 82°C to evaporate the solvent to dryness, and then vacuum-dry at 70°C for 48 hours. Under protection, heat up to 880°C at a heating rate of 8°C / min for 2 hours. After cooling to room temperature, the sample is dispersed in 95 parts of HCl solution with a concentratio...

Embodiment 2

[0021] A preparation method of S-doped Fe / N / C catalyst, comprising the steps of: dispersing 20 parts of melamine powder and 8 parts of formaldehyde solution with a mass fraction of 37% in 60 parts of deionized water, adding a concentration of 0.1mol / L NaOH solution, adjust the pH value of the solution to 9.4, stir in a water bath at 62°C for 1.5 hours, add HCl solution with a concentration of 1mol / L, adjust the pH value of the solution to 5.4, and add 0.5 parts of chlorine after the solution becomes white and turbid Calcium powder and 10 parts of FeCl with a concentration of 1mol / L 3 Add 7 parts of potassium thiocyanate to the aqueous solution, raise the temperature to 80°C and stir for 27 hours, then stir and heat at 80°C to evaporate the solvent to dryness, and then vacuum-dry at 65°C for 47 hours. Under protection, the temperature was raised to 870°C at a heating rate of 8°C / min for 1.5 hours. After cooling to room temperature, the sample was dispersed in 90 parts of HCl so...

Embodiment 3

[0023] A preparation method of S-doped Fe / N / C catalyst, comprising the steps of: dispersing 30 parts of melamine powder and 14 parts of formaldehyde solution with a mass fraction of 37% in 70 parts of deionized water, adding a concentration of 0.1mol / L NaOH solution, adjust the pH value of the solution to 9.6, stir in a water bath at 68°C for 2.5 hours, add HCl solution with a concentration of 1mol / L, adjust the pH value of the solution to 5.6, and add 1.5 parts of chlorine after the solution becomes white and turbid Calcium powder and 20 parts of FeCl with a concentration of 1mol / L 3 Add 9 parts of potassium thiocyanate to the aqueous solution, raise the temperature to 84°C and stir for 29h, then stir and heat at 84°C to evaporate the solvent to dryness, and then vacuum-dry at 75°C for 49h. Under protection, the temperature was raised to 890°C at a heating rate of 8°C / min for 2.5 hours. After cooling to room temperature, the sample was dispersed in 100 parts of HCl solution w...

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PUM

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Abstract

The invention discloses a preparation method of an S doped Fe / N / C catalyst. The preparation method comprises following steps: dispersing melamine powder and a formaldehyde solution into deionized water, adding a NaOH solution to adjust the pH to 9.4-9.6, stirring for 1.5-2.5 hours, adding an HCl solution to adjust the pH to 5.4-5.6, after the solution becomes white and turbid, adding calcium chloride powder and a water solution of FeCl3, adding potassium thiocyanate, heating to a temperature of 80-84 DEG C, stirring for 27-29 hours, completely evaporating the solvent, drying, grinding, placingpowder in a porcelain boat, processing powder for 1.5-2.5 hours at a temperature of 870-890 DEG C, cooling, dispersing the sample in an HCL solution, carrying out an acid treatment for 8-9 hours, carrying out centrifugal separation, washing, and drying, subjecting the obtained solids to a secondary high temperature heat treatment, which lasts for 4-5 hours, at a temperature of 870-890 DEG C, andcooling. The prepared S doped Fe / N / C catalyst has a large specific surface area and prominent catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of S-doped Fe / N / C catalyst. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) can directly convert chemical energy into electrical energy without being limited by the Carnot cycle. The catalyst is the core component of the fuel cell, and its main active component is platinum. However, platinum is expensive, scarce in reserves, and prone to poisoning and deactivation, resulting in high cost of fuel cells and a service life that cannot meet the needs of practical applications. The kinetics of the oxygen reduction reaction (ORR) at the cathode of a fuel cell is very slow, and the amount of platinum catalyst required for the cathode is several times that of the anode. Therefore, the development of resource-rich, high-performance, and low-cost non-precious metal oxygen reduction catalysts is of great significance for reducing the cost of fuel cells and promoting the large-scale applica...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M4/96
CPCH01M4/8647H01M4/9041H01M4/96Y02E60/50
Inventor 不公告发明人
Owner QIDONG CHUANGLYU GREENING ENG CO LTD
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