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Graphene loaded Co-N-C super-molecule hybrid aerogel composite material, preparation method thereof and application

A composite material, graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of unstable aerogel structure, limited development and application, low strength, etc., achieve significant catalytic effect, improve electrical performance, The effect of improving catalytic performance

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, due to the unstable structure, low strength and low toughness of most aerogels, the development and application of aerogels as oxygen reduction catalysts in the fields of fuel cells and metal-air batteries are largely limited. In addition, the current The electrical properties of some oxygen reduction catalysts also need to be further improved

Method used

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  • Graphene loaded Co-N-C super-molecule hybrid aerogel composite material, preparation method thereof and application
  • Graphene loaded Co-N-C super-molecule hybrid aerogel composite material, preparation method thereof and application
  • Graphene loaded Co-N-C super-molecule hybrid aerogel composite material, preparation method thereof and application

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Embodiment 1

[0042] A graphene-loaded Co-N-C supramolecular hybrid airgel composite material of the present invention, the composite material is a black sponge-like three-dimensional porous network structure, the composite material uses graphene as a substrate, and the graphene substrate and pyridine- Tryptophan gelling factor and cobalt ions assembled to form Co-N-C active catalytic center through non-covalent interaction. The Co-N-C active catalytic center is formed by doping the defects of graphene after coordinating the pyridine-tryptophan gel factor with cobalt ions. The composite material has a significant catalytic effect on the oxygen reduction reaction, and the current density can reach 4mA / cm 2 , the oxygen reduction onset potential is about -0.07V, the peak potential is about -0.175V, the catalytic effect is comparable to commercial platinum carbon, and its stability is very good, the current signal is almost unchanged after cyclic voltammetry scanning for 10,000 cycles, and it ...

Embodiment 2

[0059] A graphene-loaded Co-N-C supramolecular hybrid airgel composite material of the present invention, the composite material is a black sponge-like three-dimensional porous network structure, the composite material uses graphene as a substrate, and the graphene substrate and pyridine- Tryptophan gelling factor and cobalt ions assembled to form Co-N-C active catalytic center through non-covalent interaction. The Co-N-C active catalytic center is formed by doping the defects of graphene after coordinating the pyridine-tryptophan gel factor with cobalt ions.

[0060] The graphene-loaded Co-N-C supramolecular hybrid airgel composite material is composed of pyridine-tryptophan gel factor, cobalt acetate solution and graphene oxide flakes with a thickness of about 1 nm, after in-situ hydrothermal treatment, vacuum freeze-drying, Obtained after high temperature carbonization treatment. The schematic diagram of the preparation method is shown in figure 1 Shown, its specific prep...

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Abstract

The invention discloses a graphene loaded Co-N-C super-molecule hybrid aerogel composite material which is provided with a three-dimensional porous network-like structure. According to the composite material, the graphene serves as a base, and a Co-N-C active catalysis center is loaded on the graphene base and formed by assembling pyridine-tryptophan gelators, cobalt ions and the graphene base through non-covalent interaction. The composite material is remarkable in oxygen reduction reaction catalysis function and good in stability, electrical property and methanol toxicity resistance. The current density of the composite material can reach 4mA / cm<2>, oxygen reduction take-off potential is about -0.07V, peak potential is about -0.175V, and catalysis effects are comparable with commercial platinized carbon. The invention further discloses a preparation method of the composite material. The pyridine-tryptophan gelators, soluble cobalt salt and the graphene serve as raw materials, the composite material is prepared by hydrothermal reaction, vacuum freeze drying and carbonization treatment, and the preparation method is simple and low in production cost.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and oxygen reduction reaction catalysis, in particular to a graphene-supported Co-N-C supramolecular hybrid airgel composite material and its preparation method and application. Background technique [0002] The oxygen reduction reaction is very important in fuel cells and metal-air batteries. At present, precious metals such as platinum and palladium are often used as catalysts for the oxygen reduction reaction in fuel cell cathodes. However, the cost of this catalyst is greatly increased due to its scarcity in nature, which also hinders the development of fuel cells. , In addition, the noble metal catalyst will undergo methanol oxidation reaction, which will affect the oxygen reduction reaction in the fuel cell, and will generate a "mixed potential", which will affect the overall performance of the fuel cell. In recent years, non-precious metals (such as Fe, Co, Ni, etc.) and metal oxi...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 张翼马静王晓娟何庭谭敏力张玉媛郭赛
Owner CENT SOUTH UNIV
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