High-density transition metal monoatomic load graphene-based catalyst and preparation method thereof

An alkenyl catalyst, transition metal technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low loading, complicated preparation methods, restricting commercial applications, etc., and achieve high single-atom loading and high activity. The effect of site density

Active Publication Date: 2017-06-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the synthesized single-atom catalysts have problems such as low loading capacity and complicated preparation methods, which seriously restrict their large-scale commercial application.

Method used

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  • High-density transition metal monoatomic load graphene-based catalyst and preparation method thereof
  • High-density transition metal monoatomic load graphene-based catalyst and preparation method thereof
  • High-density transition metal monoatomic load graphene-based catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] a. Weigh 0.25g of glucose and 5g of dicyandiamide and dissolve the two in 200mL of deionized water (note that due to the low solubility of dicyandiamide in water, it is necessary to increase its mass while adding water amount until the reagent is completely dissolved);

[0048] b. Use a pipette gun to measure 2 mL of the prepared ferric chloride solution with a molar concentration of 0.0125 mol / L, and add it dropwise to the dissolved glucose and dicyandiamide solution;

[0049] c. Put the solution containing the precursor prepared above and evaporate it to dryness on a heating platform at 80°C, then take it out and grind it into a uniform powder with a mortar, put it into a suitable size quartz boat or corundum boat and add cover;

[0050] d. Next, place the whole ark in a tube furnace, and calcinate it at 900° C. for 2 hours under an inert atmosphere (nitrogen or argon), and lower the temperature naturally.

[0051] Adopt XRD to detect the prepared catalyst, the resu...

Embodiment 2

[0064] Test and evaluate the oxygen reduction performance of Example 1, Comparative Example 1, Comparative Example 2 and 20 wt% commercial platinum carbon in 0.1 mol / L KOH electrolyte. The test steps and results are described as follows:

[0065] Take 5 mg of Example 1, Comparative Example 1, Comparative Example 2 and 20wt% commercial platinum carbon samples respectively, add 950 μL of isopropanol and water mixed solvent (both volume ratio is 1:1), and add 50 μL of mass concentration of 5% Nafion was used as a binder, ultrasonically dispersed for about 2 hours to obtain a uniformly dispersed sample solution. Then, 10 μL of the prepared solution was taken out and drop-coated on a rotating disk electrode with a diameter of 5 mm, and then dried at room temperature to form a film for performance characterization.

[0066] Select the saturated Ag / AgCl electrode as the reference electrode, the graphite rod as the counter electrode, and the rotating disk electrode of the drip-coated...

Embodiment 3

[0068] Test Evaluation Example 1, Comparative Example 1, Comparative Example 2 and 20wt% commercial platinum carbon in 0.1mol / L HClO 4 Oxygen reduction performance in electrolytes. The test steps and results are described as follows:

[0069] Take 5 mg of Example 1, Comparative Example 1, Comparative Example 2 and 20wt% commercial platinum carbon samples respectively, add 950 μL of isopropanol and water mixed solvent (both volume ratio is 1:1), and add 50 μL of mass concentration of 5% Nafion was used as a binder, ultrasonically dispersed for about 2 hours to obtain a uniformly dispersed sample solution. Then, 10 μL of the prepared solution was taken out and drop-coated on a rotating disk electrode with a diameter of 5 mm, and then dried at room temperature to form a film for performance characterization.

[0070] Select the saturated Ag / AgCl electrode as the reference electrode, the graphite rod as the counter electrode, and the rotating disk electrode of the drip-coated sa...

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Abstract

The invention provides a preparation method of a high-density transition metal monoatomic load graphene-based catalyst. The preparation method comprises the following steps of dissolving a nitrogen-containing precursor, a carbon source and a soluble transition metal salt, and performing evaporation drying, grinding and calcination to obtain the high-density transition metal monoatomic load graphene-based catalyst. According to the preparation method, only the soluble metal salt is utilized, glucose and the like are used as the carbon source, dicyandiamide is used as the nitrogen-doped source, and the high-efficiency catalyst with high active site density and high monoatomic loading quantity is successfully prepared only by one-step calcination method.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a high-density transition metal single-atom supported graphene-based catalyst and a preparation method thereof. Background technique [0002] The study of catalytic active sites is of great significance to the development of new high-efficiency catalysts. A large number of experimental facts have proved that only the atoms on the particle surface of metal and its alloy catalysts play a catalytic role, which greatly reduces the utilization rate of atoms. With the rise and prosperity of nanotechnology, it has been found that reducing the particle size of the active part of the catalyst and increasing the number and dispersion of active sites are beneficial to improving the utilization rate and catalytic ability of the catalyst. [0003] With the introduction of the single-atom concept in recent years, the synthesized single-atom active site catalysts show high activity, high sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/88H01M4/9083H01M4/926Y02E60/50
Inventor 宋礼刘道彬武传强谢垚峰甘伟
Owner UNIV OF SCI & TECH OF CHINA
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