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Preparation method of flexible electrode based on graphene

A flexible electrode, graphene technology, applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of metal substrate waste, difficulty in mass production, graphene pollution, etc., to reduce the existence of oxygen-containing functional groups, improve Product quality and yield, the effect of improving electrical conductivity

Active Publication Date: 2015-01-28
山东亿维新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the redox process, commonly used reducing agents include hydrazine hydrate, sodium borohydride, etc. The use of hydrazine will lead to the introduction of heteroatom nitrogen, while sodium borohydride is expensive and easily causes hydrolysis by-products
In addition, pure chemical reduction cannot remove all the oxygen-containing functional groups contained in graphene oxide
[0012] 2. In practical applications, graphene often tends to irreversible agglomeration or stacking due to its hydrophobicity, thus losing its original excellent performance
This transfer method has a lot of disadvantages, such as: it causes a lot of waste of metal substrates, it is difficult to remove the support layer, it causes pollution of graphene, and it is difficult to produce in large quantities.
[0014] The above-mentioned shortcomings will affect the electrical conductivity of the graphene flexible electrode, making the electrochemical performance of the graphene flexible electrode much lower than the expected performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Fabrication of bendable and flexible graphene / PET flexible electrodes. The steps are:

[0040] (1) Preparation of graphene oxide solution (GO solution):

[0041] (1-2) Weigh 0.5g graphite, 0.5g NaNO 3 , with 23mL H 2 SO 4 After mixing, stir evenly under ice bath conditions;

[0042] (1-3) Slowly add 3g KMnO 4 , the mixture was transferred to 30 o Under the condition of C water bath, stir for 1h to form a thin film;

[0043] (1-4) add 40mL water, 95 o Stir for 30min under C condition;

[0044] (1-5) Add 100mL of water, then slowly add 3mL of 30% H 2 o 2 , causing the solution color to change from dark brown to yellow;

[0045] (1-6) Filter the solution, add 100 mL of water to wash, and redisperse the filter residue in water by mechanical agitation;

[0046] (1-7) Centrifuge at 1000rpm / min for 2min, repeat 3 times to remove graphene oxide sheets with non-uniform size;

[0047] (1-8) The supernatant was centrifuged at 8000rpm / min for 15min, and repeated twice ...

Embodiment 2

[0059] Fabrication of stretchable and flexible graphene / PDMS flexible electrodes. The steps are:

[0060] (1) Preparation of graphene oxide solution (GO solution):

[0061] (1-2) Weigh 0.3g graphite, 0.3g NaNO 3 , with 14mL H 2 SO 4 After mixing, stir evenly under ice bath conditions;

[0062] (1-3) Slowly add 1.8g KMnO 4 , the mixture was transferred to 40 o Under the condition of C water bath, stir for 1h to form a thin film;

[0063] (1-4) add 24mL water, 85 o Stir for 30min under C condition;

[0064] (1-5) Add 60mL of water, then slowly add 1.8mL of 30% H 2 o 2 , causing the solution color to change from dark brown to yellow;

[0065] (1-6) Filter the solution, add 60 mL of water to wash, and redisperse the filter residue in water by mechanical agitation;

[0066] (1-7) Centrifuge at 1000rpm / min for 2min, repeat 5 times to remove graphene oxide sheets with non-uniform size;

[0067] (1-8) The supernatant was centrifuged at 8000rpm / min for 15min, repeated 3 t...

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Abstract

The invention provides a preparation method of a flexible electrode based on graphene. The preparation method comprises the steps of graphene oxide solution preparation, coating, chemical reduction and electrochemical reduction. In the chemical reduction step, acetic acid and hydroiodic acid are adopted as reducing agents so that the functional groups of the graphite (graphene) oxide can be well removed and the electrical conductivity of the graphene oxide can be improved; in the electrochemical reduction, pressurization is realized by virtue of linear sweep voltammetry to further reducing the oxygen-containing functional groups. The flexible thin-film electrode which is prepared by use of the preparation method of the flexible thin-film electrode and hybridized with the heat-treated graphene oxide and an electrode active material can be widely applied to the fields of batteries, touch screens, OLEDs, super capacitance materials, green and environment-friendly automobiles and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to a method for preparing a graphene-based flexible electrode. Background technique [0002] Graphene is a two-dimensional (2D) periodic honeycomb lattice structure composed of carbon six-membered rings, with a theoretical specific surface area of ​​up to 2600m 2 / g, with outstanding thermal conductivity (3000W / (m K)) and mechanical properties (1060GPa), as well as high-speed electron mobility at room temperature (15000cm 2 / (V·s)). Graphene's special two-dimensional structure makes it have a series of properties such as perfect quantum tunneling effect, never-disappearing electrical conductivity, and bendability, which has aroused great interest in the scientific community, and graphene is setting off a wave of research. [0003] Graphene is the thinnest and hardest nanomaterial known in the world. It is almost completely transparent and only absorbs 2.3% of light; i...

Claims

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Application Information

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IPC IPC(8): H01B13/00C01B31/04
Inventor 臧剑锋袁方裴梦婷戴祖明黄琦
Owner 山东亿维新材料有限责任公司
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