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High-conductivity corrosion-resistant polymer composite coating, preparation method thereof and bipolar plate

A composite coating and polymer technology, applied in the fields of materials science and electrochemistry, can solve problems such as structural defects, galvanic corrosion of graphene and metal substrates, etc.

Active Publication Date: 2022-04-12
JIHUA LAB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a highly conductive and corrosion-resistant polymer composite coating and its preparation method and bipolar plate, aiming to solve the existing large number of structural defects in the graphene coating, Problems that easily lead to galvanic corrosion between graphene and metal substrates

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  • High-conductivity corrosion-resistant polymer composite coating, preparation method thereof and bipolar plate
  • High-conductivity corrosion-resistant polymer composite coating, preparation method thereof and bipolar plate

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preparation example Construction

[0036] Specifically, the preparation method of the highly conductive and corrosion-resistant polymer composite coating of the present application comprises the following steps:

[0037] (1) Depositing a graphene oxide coating on the surface of the metal substrate:

[0038] Step 11): adding graphene oxide in deionized water, dispersing, and preparing graphene oxide suspension;

[0039] Step 12): Using a three-electrode system, the metal substrate is used as the working electrode, the saturated calomel electrode is used as the reference electrode, and the platinum electrode is used as the auxiliary electrode, and the graphene oxide suspension prepared in step 11) is used as the electrolyte. The graphene oxide coating is deposited on the surface of the metal substrate by a chemical method to obtain the metal substrate with the graphene oxide coating.

[0040] In step 11), the way of dispersion treatment may be one or both of ultrasonic dispersion or stirring dispersion. The met...

Embodiment 1

[0083] A 1.0mg / L graphene oxide suspension was prepared with deionized water and graphene oxide, and used as the electrolyte for electrochemical deposition. A three-electrode system was used, with the treated aluminum alloy substrate as the working electrode, saturated glycerin The mercury electrode is used as the reference electrode, and the platinum electrode is used as the auxiliary electrode. The deposition method adopts conventional pulse voltammetry (NPV), the voltage range is 0-10V, the pulse width is 0.1s, the step width is 10mV, and the step width is 0.5s. A graphene oxide coating with a thickness of about 100 nm was obtained.

[0084] Use deionized water and functionalized carbon nanotubes to configure the suspension of 3mg / L functionalized carbon nanotubes, then add aniline monomer, so that the concentration of aniline monomer in the PANI / CNTs suspension is 0.01M, with PANI / CNTs The suspension is used as the electrolyte, and the pH value is adjusted between 3-5. A t...

Embodiment 2

[0087] Prepare 1.0 mg / L graphene oxide suspension with deionized water and graphene oxide, and use this as electrolyte for electrochemical deposition. A three-electrode system is used, with the treated aluminum alloy substrate as the working electrode, saturated glycerol The mercury electrode is used as the reference electrode, and the platinum electrode is used as the auxiliary electrode. The deposition method adopts cyclic voltammetry, the control scanning range is -1500~600mV / SCE, the scanning speed is 10mV / s, and the number of cycles is 10 times. The prepared thickness is about 100nm graphene oxide coating.

[0088] Use deionized water and functionalized carbon nanotubes to configure the suspension of 3mg / L functionalized carbon nanotubes, then add aniline monomer, so that the concentration of aniline monomer in the PANI / CNTs suspension is 0.01M, with PANI / CNTs The suspension is used as the electrolyte, and the pH value is adjusted between 3-5. A three-electrode system is ...

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Abstract

The invention relates to the field of material science and electrochemistry, and discloses a high-conductivity corrosion-resistant polymer composite coating, a preparation method thereof and a bipolar plate, and the preparation method of the high-conductivity corrosion-resistant polymer composite coating comprises the following steps: depositing a graphene oxide coating on the surface of a metal substrate; and depositing a PANI / CNTs composite coating on the surface of the graphene oxide coating to obtain the graphene oxide-PANI / CNTs composite coating. The PANI / CNTs composite coating prepared on the surface layer of the graphene oxide coating can be used as a covering layer for covering and repairing defects of the graphene oxide coating, the defect density of the graphene oxide coating can be reduced, and the shielding effect of the composite coating is improved.

Description

technical field [0001] The application relates to the fields of material science and electrochemistry, and mainly relates to a highly conductive and corrosion-resistant polymer composite coating, a preparation method thereof, and a bipolar plate. Background technique [0002] As a key core device for the construction of a hydrogen energy society, the fuel cell plays a key role in directly converting the chemical energy of hydrogen into electrical energy. It has the advantages of high energy conversion efficiency, low pollution, and low noise, and can simultaneously solve the two worlds of energy and environmental protection. problem. Among them, the bipolar plate, as one of the key core components, mainly plays the role of distributing fuel gas and oxidant, discharging reaction products and heat, collecting and conducting current, providing mechanical support for membrane electrode (MEA), separating and connecting single cells in series, etc. In addition, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04C25D7/00C25D9/02H01M8/0228H01M8/0213H01M8/0206
Inventor 徐龙崔传禹杨浩赵聪聪杨光猛夏大彪冯上样郑念竹王娜卢祺谭兴儒周木华
Owner JIHUA LAB
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