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A kind of supramolecular hybrid hydrogel, graphene aerogel and preparation method and application thereof

A graphene aerogel and hydrogel technology, applied in the field of electrochemistry, can solve the problems of poor electrical conductivity and related stability, reduced specific surface area, limitations, etc., and achieve the effects of low cost, good contact, and stable strength

Active Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although two-dimensional graphene sheets have many excellent properties, they are easy to stack in parallel, which greatly reduces the specific surface area.
However, due to the inherent poor conductivity and related stability of most hydrogel systems, their applications in electrochemistry and related fields are largely limited.

Method used

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  • A kind of supramolecular hybrid hydrogel, graphene aerogel and preparation method and application thereof
  • A kind of supramolecular hybrid hydrogel, graphene aerogel and preparation method and application thereof
  • A kind of supramolecular hybrid hydrogel, graphene aerogel and preparation method and application thereof

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Embodiment 1

[0038] A supramolecular hybrid hydrogel of the present invention, the supramolecular hybrid hydrogel is a three-dimensional network structure, composed of ferrocene-phenylalanine gel factor (Fc-Phe-OH) and a thickness of about 1nm ultrathin graphene oxide was co-assembled through non-covalent bonds.

[0039] The preparation method of the supramolecular hybrid hydrogel of the present embodiment comprises the following steps: the preparation of graphene oxide is to use natural flake graphite as raw material, adopting the improved Hummers method (J. Am. Chem. Soc.1958, 80 (6) 1339-1339; Journal of Materials Chemistry, 2011, 21 (10) 3335-3345.): mix 2.0g of natural graphite and 1.0g of sodium nitrate, add 50ml of concentrated sulfuric acid (98%) under stirring, ice bath The reaction was stirred for 1 h, and then 6.0 g of potassium permanganate was slowly added, and the reaction was continued for 2 h under ice bath, and the mixture was heated to 35 °C for 2 h. Slowly add 120ml of ...

Embodiment 2

[0046] A supramolecular hybrid hydrogel of the present invention, the supramolecular hybrid hydrogel is a three-dimensional network structure, composed of ferrocene-diphenylalanine gelling factor (Fc-Phe-Phe-OH) and Ultrathin graphene oxide with a thickness of about 1.5 nm is co-assembled through non-covalent bonds.

[0047] The preparation method of the supramolecular hybrid hydrogel of the present embodiment comprises the following steps: the preparation of graphene oxide is to use natural flake graphite as raw material, adopting the improved Hummers method (J. Am. Chem. Soc.1958, 80 (6) 1339-1339; Journal of Materials Chemistry, 2011, 21 (10) 3335-3345.). Adjust the pH of the graphene oxide aqueous solution to alkaline (pH=10.0) with phosphate buffered saline; add 24 mg of ferrocene-diphenylalanine powder into a centrifuge tube, then add 200 μL of dimethyl sulfoxide to dissolve, and ultrasonicate 1 min to prepare a stock solution with a concentration of 120 mg·mL − 1 ; A...

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Abstract

The invention provides a supramolecular hybrid hydrogel, graphene airgel and its preparation method and application. The hydrogel is a three-dimensional network structure composed of ferrocene-amino acid gelling factor and graphene covalently bonded co-assembled. The supramolecular hybrid hydrogel of the invention has a strong and stable current signal, has good electrical properties, and can be applied to the fields of trace detectors and biosensors. Graphene aerogels containing Fe3O4 nanoparticles and nitrogen-doped three-dimensional graphene were obtained by in situ synthesis using the above-mentioned supramolecular hybrid hydrogels. The Fe3O4 / nitrogen-doped graphene airgel of the present invention has a remarkable electrocatalytic effect on the oxygen reduction reaction, and its catalytic current density reaches 3 mA cm-2. The synthesis method is simple and the cost is low, and it can provide powerful fuel cell production technology. guidance.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a supramolecular hybrid hydrogel, a graphene airgel and a preparation method and application thereof. Background technique [0002] The oxygen reduction reaction (Oxygen Reduction Reaction, hereinafter referred to as ORR) plays a very important role in fuel cells. Although platinum and platinum alloy nanoparticles are the ORR catalysts with the highest catalytic efficiency, platinum is scarce in nature and expensive, which has greatly hindered the development of fuel cells. In recent years, non-precious metal or metal oxide materials (such as ZnO, Co 3 o 4 , Fe 2 o 3 , Fe 3 o 4 etc.) are widely used in the field of electrochemical energy storage and conversion, such as fuel cells, dye-sensitized cells, solar cells, lithium-ion batteries, and supercapacitors. However, these metals or metal oxides often have poor solubility, high calcination temperature, and easy aggregation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J27/24G01N27/48
Inventor 张翼何庭李正元刘洪涛张珍珠张瑞邹丽芬袁孟颖彭诗超
Owner CENT SOUTH UNIV