Exotic-atom-doped graphene, and preparation method and application thereof

A heteroatom and graphene technology, applied in the field of electrocatalysts for high-performance chemical power sources, can solve the problems of cumbersome preparation process and harsh requirements for instruments and equipment, and achieve the effects of wide sources, low requirements for instruments and equipment, and long cycle life

Active Publication Date: 2016-07-06
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and easy method for synthesizing heteroatom-doped graphene, and to disclose it as Application of Oxygen Reduction Electrocatalysts for Fuel Cells and Bifunctional Catalysts for Lithium-air Batteries

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  • Exotic-atom-doped graphene, and preparation method and application thereof
  • Exotic-atom-doped graphene, and preparation method and application thereof
  • Exotic-atom-doped graphene, and preparation method and application thereof

Examples

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Embodiment 1

[0037] Example 1 Preparation of Nitrogen (N) and Phosphorus (P) Binary Co-doped Graphene

[0038] Nitrogen and phosphorus binary co-doped graphene was synthesized by pyrolysis of tetraphenylphosphine bromide (C 24 h 20 BrP) onium salt and urea (Con 2 h 4 ) mixture prepared. First, weigh 0.1g of tetraphenylphosphine bromide, dissolve it in 1mL of hot deionized water (35°C), and stir until a uniform and transparent solution is formed; then weigh 2g of urea and dissolve it in 2mL of deionized water. The two solutions were mixed together and homogenized by sonication. Then the mixed solution was evaporated and dried at 60°C, and the dried white powder was heat-treated in a tube furnace at 800°C for 3 hours under an Ar atmosphere, and finally the product was repeatedly washed with deionized water to remove possible residual heteroions. Dry to obtain N and P binary co-doped graphene.

[0039] The prepared catalyst was characterized, and the results are as follows:

[0040] at...

Embodiment 2

[0043] The preparation of embodiment dinitrogen (N) and boron (B) binary co-doped graphene

[0044] Nitrogen and boron co-doped graphene was obtained by pyrolysis of sodium tetraphenylborate (C 24 h 20 BNa) onium salt and urea (con 2 h 4 ) made from a mixture. First, weigh 0.2g of sodium tetraphenylborate, dissolve it in 2mL of ethanol, stir vigorously until a uniform and transparent solution is formed; then weigh 2g of urea and dissolve it in 2mL of deionized water, mix the above two solutions together, Disperse evenly. Then the mixed solution was evaporated and dried at 50°C, and the dried white powder was heat-treated in a tube furnace at 900°C for 2 hours under an Ar atmosphere, and finally the product was repeatedly washed with deionized water to remove possible residual heteroions. Dry to obtain N and B binary co-doped graphene. Utilize TEM to carry out characterization, the obtained product appearance is identical with embodiment one; Can know by XPS energy spectr...

Embodiment 3

[0046] Preparation of Example Three Phosphorus (P) and Boron (B) Binary Co-doped Graphene

[0047] With tetraphenylphosphine bromide (C 24 h 20 BrP) onium salt and sodium tetraphenylborate (C 24 h 20 BNa) onium salt is used as a precursor, and the two substances are combined by the electrostatic attraction between positive and negative ions, and then calcined at a high temperature to prepare P and B binary doped graphene. Weigh 2.10g of tetraphenylphosphine bromide and 1.71g of sodium tetraphenylborate and dissolve them in 5mL of ethanol. After ultrasonic dispersion, each forms a transparent and clear solution. When the two solutions are mixed together, the transparent and clear solution becomes white and viscous. thick liquid. Then the mixed viscous liquid was evaporated to dryness at 40°C, and the dried white powder was heat-treated in a tube furnace at 1000°C for 3 hours under an Ar atmosphere, and finally washed repeatedly with deionized water to remove possible residu...

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Abstract

The invention discloses an exotic-atom-doped graphene, and a preparation method and application thereof, belonging to high-performance chemical power sources and correlated fields. The preparation method comprises the following steps: dissolving an exotic atom precursor compound in a solvent, and uniformly mixing; removing the solvent to obtain solid powder; and treating the solid powder at 700-1000 DEG C in an inert atmosphere for 1-5 hours to prepare the exotic-atom-doped graphene in situ. The exotic-atom-doped graphene has comparable oxygen reduction catalytic activity with the commercialized Pt/C, has better methanol oxidation resistance and stability than the commercialized Pt/C catalyst, and can be used in the field of fuel cells. The exotic-atom-doped graphene has double-function catalytic properties, can obtain high charge/discharge capacity, excellent charge/discharge magnification and long cycle life when being used for secondary lithium-air cells, and is applicable to the field of metal-air cells.

Description

technical field [0001] The invention relates to a type of battery catalyst, in particular to a heteroatom-doped graphene and its preparation method and application, and belongs to the field of high-performance chemical power source electrocatalysts. Background technique [0002] Fuel cells and metal-air batteries, as green and environment-friendly energy storage and conversion devices, have attracted much attention due to their advantages of high energy density, high conversion efficiency and no pollution to the environment. However, the oxygen electrode reaction of two kinds of energy storage and conversion devices, such as the oxygen reduction reaction of fuel cells, and the oxygen reduction and oxygen evolution reactions of metal-air batteries, is a kinetically slow process that requires efficient catalysts to promote the reaction. Currently, the most effective oxygen reduction catalyst is the noble metal Pt and its alloys, and the most effective oxygen evolution catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B01J21/18
CPCB01J21/18C01B2204/22C01P2002/72C01P2002/82C01P2002/85C01P2004/04
Inventor 杨瑞枝吴娇郑祥俊
Owner SUZHOU UNIV
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