Doped carbon dot and graphene compound as well as preparation method and application thereof

A doped graphene technology, applied in the field of nanomaterials, can solve the problems of high price of platinum catalysts, limited large-scale application, increased cost of fuel cell solutions, etc., and achieves a simple and easy preparation method, low cost, The effect of stabilizing chemical and physical properties

Inactive Publication Date: 2017-06-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the price of platinum-based catalysts is relatively expensive, which greatly increases the c

Method used

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  • Doped carbon dot and graphene compound as well as preparation method and application thereof
  • Doped carbon dot and graphene compound as well as preparation method and application thereof
  • Doped carbon dot and graphene compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of nitrogen and sulfur double-doped carbon dots using lipoic acid and ethylenediamine as raw materials

[0035] Dissolve 0.1 gram of lipoic acid, 0.06 gram of ethylenediamine and 0.02 gram of sodium hydroxide in 10 milliliters of deionized water, disperse evenly, transfer to a 50 milliliter polytetrafluoroethylene-lined reactor, and react at 250 ° C for 24 hours Afterwards, the reaction solution was taken out and filtered to remove impurities and dialyzed in deionized water for 48 hours with a 3500 Da molecular weight cut-off dialysis bag, and then the resulting solution was freeze-dried to obtain nitrogen and sulfur double-doped carbon dot powder solids.

[0036] (2) Preparation of nitrogen and sulfur double-doped carbon dots and graphene composites

[0037] 20 mg of graphene oxide was dispersed in 10 mL of deionized water and ultrasonicated for 30 minutes to form a uniform dispersion, then 20 mg of nitrogen and sulfur double-doped carbon dots were adde...

Embodiment 2

[0039] (1) Preparation of phosphorus and sulfur double-doped carbon dots using lipoic acid and phytic acid as raw materials

[0040] Dissolve 0.1 g of lipoic acid and 0.06 g of phytic acid in 10 ml of deionized water, disperse evenly, transfer to a 50 ml polytetrafluoroethylene-lined reactor, react at 250 ° C for 24 hours, then take out the reaction solution and filter Impurities were removed and a dialysis bag with a molecular weight cut-off of 3500 Da was dialyzed in deionized water for 48 hours, and then the resulting solution was freeze-dried to obtain a solid phosphorus and sulfur double-doped carbon dot powder.

[0041] (2) Preparation of phosphorus and sulfur double-doped carbon dots and graphene composites

[0042] This step is the same as step (2) of Example 1, and the obtained product is the carbon dot / graphene composite material doped with phosphorus and sulfur in the present invention, named P,S-CD / rGO (1:1).

Embodiment 3

[0044] (1) Nitrogen and phosphorus double-doped carbon dots were prepared using phytic acid and ethylenediamine as raw materials

[0045] Dissolve 0.06 g of phytic acid and 0.02 g of ethylenediamine in 10 ml of deionized water, disperse evenly, transfer to a 50 ml polytetrafluoroethylene-lined reactor, react at 250 ° C for 24 hours, and then take out the reaction solution Impurities were removed by filtration and dialyzed in deionized water for 48 hours with a 3500 Da molecular weight cut-off bag, and then the resulting solution was freeze-dried to obtain a nitrogen-phosphorus double-doped carbon dot powder solid.

[0046] (2) Preparation of nitrogen and phosphorus double-doped carbon dots and graphene composites

[0047] This step is the same as step (2) of Example 1, and the obtained product is the phosphorous and sulfur double doped carbon dot / graphene composite material of the present invention, named N,P-CD / rGO (1:1).

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Abstract

The invention belongs to the technical field of nanomaterials and particularly relates to a doped carbon dot and graphene compound as well as a preparation method and an application thereof. The preparation method comprises the steps as follows: lipoic acid, ethylenediamine, phytic acid and the like are used as mixed element precursors to be dissolved in deionized water and uniformly mixed, and doped carbon dots are obtained through a hydrothermal reaction in a reaction kettle; the carbon dots are added to a graphene oxide aqueous solution to be subjected to a hydrothermal reaction, then washing and drying are performed, and the doped carbon dot and graphene compound is obtained. The electro-catalysis effect best for oxygen reduction can be obtained by adjusting the type of mixed elements in the carbon dots and the proportion of the carbon dots to graphene. The preparation method is simple and easy to implement and low in cost; the chemical and physical properties of the obtained material are stable, a representative nitrogen and sulfur double-doped carbon dot-graphene composite can realize the four-electron transfer process for oxygen reduction, the reduction overpotential is obviously smaller than that of single-doped samples and other doped samples, and the material can be applied to electro-catalysis of oxygen reduction reactions on cathodes of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method and application of a nanocomposite material. Background technique [0002] Fuel cells, among all energy storage / conversion devices, are considered to be one of the important ways to solve future energy problems due to their high energy density, high power, and non-polluting features. [0003] In the existing fuel cell technology, the catalyst necessary for the oxygen reduction reaction on the anode is generally selected as a noble metal catalyst such as platinum series. However, the price of platinum-based catalysts is relatively expensive, which greatly increases the cost of the entire fuel cell solution, thus limiting its large-scale application in the civilian range. Based on this, people have strengthened the research on platinum alternative catalysts to obtain low-cost, high-efficiency and high-stability oxygen reduction catalysts. In...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/96
CPCH01M4/8825H01M4/8828H01M4/9083H01M4/96Y02E60/50
Inventor 张鹏熊焕明
Owner FUDAN UNIV
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