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Method for preparing doped graphene or graphene-like compound

A technology of graphene and heteroatoms, which is applied in the field of preparation of doped graphene or graphene-like, can solve problems such as difficulty in obtaining large-area, thick graphene, complex surface structure, etc.

Inactive Publication Date: 2016-07-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene is grown epitaxially on the surface of SiC, because the surface of SiC crystal is easy to restructure during high temperature heating, resulting in a complex surface structure, and it is difficult to obtain large-area and uniform-thickness graphene.

Method used

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  • Method for preparing doped graphene or graphene-like compound
  • Method for preparing doped graphene or graphene-like compound
  • Method for preparing doped graphene or graphene-like compound

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The nano-silica and hexamethylenediamine are prepared into a solution according to the mass ratio of 0.1, and after stirring to obtain a uniform suspension liquid, the mixture is heated to 150° C. and kept for 24 hours. After centrifugal separation, the obtained solid product is dried, and then sintered by microwave heating. The sintering temperature is 900° C., and the sintering time is 30 minutes.

[0036] The nitrogen-doped graphene that present embodiment obtains, its Raman spectrum is as follows figure 1 shown. The Raman spectrum of nitrogen-doped graphene has strong D and G peaks, and the intensity of the G peak is higher than that of the D peak, indicating that graphite-structured carbon is formed, and the 2D and D+G peaks appear at the same time, and the peak intensity is weak , indicating that there are more layers of graphitic carbon.

Embodiment 2

[0038] Prepare nano-silica and hexamethylenediamine into a solution with a mass ratio of 0.1, and add CoCl 2 , where CoCl 2 The molar ratio to hexamethylenediamine is 0.01. After stirring to obtain a uniform suspension liquid, heat it to 150°C and keep it warm for 24 hours. After centrifugal separation, the obtained solid product was dried, and then sintered by microwave heating under nitrogen atmosphere, the sintering temperature was 650° C., and the sintering time was 60 minutes.

[0039] The nitrogen-doped graphene that present embodiment obtains, its Raman spectrum is as follows figure 2 shown. The Raman spectrum of nitrogen-doped graphene has sharp D and G peaks, and the intensity of G peak is higher than that of D peak, indicating that graphite structure carbon is formed. At the same time, sharp and symmetrical 2D peaks appear, and their intensity is significantly enhanced, indicating that Graphite carbon has fewer layers, forming a few-layer graphene structure. XPS...

Embodiment 3

[0041] Prepare nano-silica and hexamethylenediamine into a solution with a mass ratio of 0.1, and add CoCl 2 , where CoCl 2 The molar ratio to hexamethylenediamine is 0.01. After stirring to obtain a uniform suspension liquid, heat it to 150°C and keep it warm for 24 hours. After the centrifuged solid product is dried, it is sintered by microwave heating under a nitrogen atmosphere, the sintering temperature is 900° C., and the sintering time is 30 minutes.

[0042] The nitrogen-doped graphene that present embodiment obtains, its Raman spectrum is as follows Figure 4 shown. The Raman spectrum of nitrogen-doped graphene has strong D and G peaks, and the intensity of G peak is higher than that of D peak, indicating that a better graphite structure carbon is formed, and a broad 2D peak appears at the same time, and the peak intensity is weaker, indicating that Graphite carbon has many layers. XPS results showed that the atomic ratio of N / C was 8%. After washing silica with ...

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Abstract

The invention relates to a method for preparing a doped graphene or graphene-like compound, and belongs to the fields of preparation of nanomaterial and preparation of fuel cell nano electrocatalyst. The method comprises the steps: with a nano-oxide or carbon as a carrier, or without use of a carrier, a mixture of one or more than two of nitrogen-containing organic molecules, boron-containing organic molecules, phosphorus-containing organic molecules, sulfur-containing organic molecules, and nitrogen-boron, sulfur-nitrogen or nitrogen-phosphorus containing organic molecules is used as a precursor, iron, cobalt, nickel and other transition metals or platinum, palladium, gold, silver and other precious metal salts are added, sintering is carried out by a microwave heating method, and thus the doped graphene or graphene-like product is obtained. The prepared hetero atom doped graphene or graphene-like product and the hetero atom doped graphene or graphene-like product loaded with iron, cobalt, nickel and other transition metals or platinum, palladium, gold, silver and other precious metals and alloys thereof can be used as a fuel cell catalyst.

Description

technical field [0001] The invention relates to a preparation method of doped graphene or graphene-like, the doped graphene or graphene-like alone or loaded with transition metal, noble metal and alloy nanoparticles, used as a catalyst in a fuel cell, belonging to nano Material preparation and preparation of fuel cell nano-electrocatalysts. Background technique [0002] Fuel cells are facing the initial stage of commercialization. An important issue affecting the commercialization of fuel cells is that the catalyst used is the noble metal platinum, which greatly increases the cost of fuel cells. At the same time, due to the scarcity of platinum, large-scale fuel cells Application is limited. Based on the U.S. Department of Energy’s target of 0.2g / kW platinum loading in automotive fuel cell catalysts in 2015, the global production of 100 million 50kW fuel cell vehicles each year requires a stable supply of 1,000 tons of platinum a year. In recent years, the global platinum p...

Claims

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Application Information

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IPC IPC(8): H01M4/90C01B31/04
CPCY02E60/50
Inventor 曾蓉蒋利军李治应王立根王树茂
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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