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A kind of flexible electrode preparation method based on graphene

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

Active Publication Date: 2017-07-18
山东亿维新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] Preparation of flexible graphene / PET flexible electrodes. The steps are:

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

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

[0042] (1-3) Slowly add 3g KMnO 4 , The mixture is transferred to 30 o Under C water bath conditions, stir for 1 hour to form a 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 H with a mass concentration of 30% 2 O 2 , Causing the color of the solution 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 for 2 min at 1000 rpm / min, repeat 3 times to remove graphene oxide flakes with uneven size;

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

Embodiment 2

[0059] Prepare 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 and 0.3g NaNO 3 , And 14mL H 2 SO 4 After mixing, stir evenly under ice bath conditions;

[0062] (1-3) Slowly add 1.8g KMnO 4 , The mixture is transferred to 40 o Under C water bath conditions, stir for 1 hour to form a 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 H with a mass concentration of 30% 2 O 2 , Causing the color of the solution 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 flakes with uneven size;

[0067] (1-8) Centrifuge the supernatant at 8000rpm / min for 15min, repeat 3 times to remove ...

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Abstract

The invention provides a graphene-based flexible electrode preparation method, comprising the steps of preparing a graphene oxide solution, coating, chemical reduction, and electrochemical reduction. In the step of chemical reduction, the reducing agent is acetic acid and hydroiodic acid, which can remove the functional groups of graphene oxide (ene) excellently and improve the conductivity of graphene oxide; in the step of electrochemical reduction, linear sweep voltammetry is used Pressurization further reduces the presence of oxygen-containing functional groups. The heat-treated graphene oxide and electrode active material hybridized flexible thin-film electrode prepared by the method for preparing the flexible thin-film electrode of the present invention can be widely used in fields such as batteries, touch screens, OLEDs, supercapacitor materials, and green automobiles.

Description

Technical field [0001] The invention belongs to the technical field of electronic materials, and particularly relates 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 six-membered carbon rings, with a theoretical specific surface area of ​​up to 2600m 2 / g, with outstanding thermal conductivity (3000W / (m·K)) and mechanical properties (1060GPa), and high-speed electron mobility at room temperature (15000cm 2 / (V·s)). The special two-dimensional structure of graphene gives it a series of properties such as perfect quantum tunneling effect, never-disappearing electrical conductivity, bendability, etc., which has aroused great interest in the scientific community, and graphene is setting off a research boom. [0003] Graphene is the thinnest and hardest nanomaterial known in the world. It is almost completely transparent and only absorbs 2.3% of light. The the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00C01B32/19
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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