A kind of highly conductive and corrosion-resistant polymer composite coating and its preparation method and bipolar plate
A composite coating and bipolar plate technology, applied in the fields of materials science and electrochemistry, can solve problems such as galvanic corrosion and structural defects between graphene and metal substrates
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[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) Deposition of graphene oxide coating on the surface of metal substrate:
[0038] Step 11): adding graphene oxide in deionized water, dispersing, and configuring to obtain a graphene oxide suspension;
[0039] Step 12): adopting a three-electrode system, using the metal substrate as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum electrode as the auxiliary electrode, using the graphene oxide suspension prepared in step 11) as the electrolyte, and electrolytically A graphene oxide coating is deposited on the surface of a metal substrate by a chemical method to obtain a metal substrate with the graphene oxide coating.
[0040] In step 11), the dispersion treatment method may be one or both of ultrasonic dispersion or stirring dispersion. Th...
Embodiment 1
[0083] A 1.0 mg / L graphene oxide suspension was prepared with deionized water and graphene oxide, and electrochemical deposition was carried out with this as the electrolyte. The mercury electrode is the reference electrode, the platinum electrode is the auxiliary electrode, and the deposition method adopts conventional pulse voltammetry (NPV). A graphene oxide coating with a thickness of about 100 nm was obtained.
[0084] A suspension of 3 mg / L of functionalized carbon nanotubes was prepared with deionized water and functionalized carbon nanotubes, and then aniline monomer was added to make the concentration of aniline monomer in the PANI / CNTs suspension to be 0.01 M. The suspension was used as the electrolyte, and the pH value was adjusted between 3-5. The three-electrode system was used to deposit the PANI / CNTs composite coating on the surface of the graphene oxide coating. Cyclic voltammetry was used to control the scanning range from -200 to 1200mV / SCE, the scanning sp...
Embodiment 2
[0087] A 1.0 mg / L graphene oxide suspension was prepared with deionized water and graphene oxide, and this was used as the electrolyte for electrochemical deposition. The mercury electrode is the reference electrode, the platinum electrode is the auxiliary electrode, and the deposition method adopts cyclic voltammetry. 100nm graphene oxide coating.
[0088] A suspension of 3 mg / L of functionalized carbon nanotubes was prepared with deionized water and functionalized carbon nanotubes, and then aniline monomer was added to make the concentration of aniline monomer in the PANI / CNTs suspension to be 0.01 M. The suspension was used as the electrolyte, and the pH value was adjusted between 3-5. The three-electrode system was used to deposit the PANI / CNTs composite coating on the surface of the graphene oxide coating. Cyclic voltammetry was used to control the scanning range from -200 to 1200mV / SCE, the scanning speed was 20mV / s, the number of cycles was 20, and the PANI / CNTs compo...
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