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Method for preparing graphene conductive polymer coating on surface of bipolar plate by adopting electro-deposition process

A technology of conductive polymer and electrodeposition method, which is applied in the direction of electrolytic organic material coating, electrolytic inorganic material coating, circuit, etc., can solve the problems of electrolyte penetration, difficult to withstand the working environment of PEMFC, etc., achieve smooth and dense appearance, and improve physical barrier The effect of performance and productivity advantages

Pending Publication Date: 2021-11-19
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating micro-defects formed during the synthesis process of a single conductive polymer coating will still lead to electrolyte penetration, making it difficult to withstand the harsh working environment of PEMFC.

Method used

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  • Method for preparing graphene conductive polymer coating on surface of bipolar plate by adopting electro-deposition process
  • Method for preparing graphene conductive polymer coating on surface of bipolar plate by adopting electro-deposition process
  • Method for preparing graphene conductive polymer coating on surface of bipolar plate by adopting electro-deposition process

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Embodiment 1

[0045] The present embodiment provides a method for preparing a graphene conductive polymer coating on the surface of a bipolar plate by electrodeposition, comprising the following steps:

[0046] Step 1, preparing modified graphene;

[0047] Step 1.1, disperse 1g of graphene oxide in 1L of water, stir to make it evenly mixed, then stir and disperse the graphene oxide dispersion at a speed of 600rpm to obtain a well-dispersed 1mg / mL graphene oxide dispersion in aqueous solution ;

[0048] Step 1.2, use sodium hydroxide to adjust the pH of the dispersion to be alkaline (PH=9-10), prepare an aqueous solution of sodium borohydride (1.05mol / L), mix the prepared aqueous solution of sodium borohydride with the dispersion, and stirring at 80° C., pre-reducing the graphene oxide dispersion, and centrifuging the pre-reduced graphene oxide.

[0049] Step 1.3, performing sulfonation modification on the pre-reduced graphene oxide.

[0050] The specific steps of step 1.3 are:

[0051] St...

Embodiment 2

[0061] The present embodiment provides a method for preparing a graphene conductive polymer coating on the surface of a bipolar plate by electrodeposition, comprising the following steps:

[0062] Step 1. The material of the metal-based bipolar plate is SS304. Use sandpaper (200 mesh and 1000 mesh) to polish the surface of the stainless steel to remove the surface passivation film; use acetone to remove surface oil and fingerprints, and use ethanol to remove excess solvent. Put the sample into 1mol / L H 2 SO 4 , to further remove the surface passivation film and increase the binding sites on the surface;

[0063] Step 2. Configure 1mg / ml sulfonated graphene aqueous solution, add pyrrole (0.05mol / L) to obtain a mixed electrolyte, stir the mixed solution at a speed of 600rmp for 10min, and ultrasonicate at 150Hz for 10min (ultrasonic temperature is 24°C) to obtain a uniform mixture the electrolyte;

[0064] Step 3. Install the polished and cleaned SS304 on the electrode holder...

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Abstract

The invention provides a method for preparing a graphene conductive polymer coating on the surface of a bipolar plate by adopting an electrodeposition process. The method comprises the following steps: 1, chemically modifying graphene oxide, and grafting an anionic functional group to prepare a modified graphene oxide aqueous dispersion; 2, mixing the modified graphene aqueous dispersion and a conductive polymer monomer aqueous dispersion in proportion to obtain an electrolyte; 3, pretreating a metal-based bipolar plate, putting the metal-based bipolar plate into a sulfuric acid solution to be soaked, and removing a passive film on the surface of the metal-based bipolar plate; 4, with the metal-based bipolar plate as an anode and a platinum sheet as a cathode, performing electro-deposition on the metal-based bipolar plate through a direct-current power source; and 5, drying a wet film obtained by deposition to obtain the graphene conductive polymer composite coating. The doping effect of functional groups on the surface of the anionic modified graphene on the conductive polymer is utilized, pi electron delocalization of the conductive polymer is promoted, and the conductivity of the composite coating is improved.

Description

technical field [0001] The invention relates to the technical field of graphene coating and the field of metal-based bipolar plate materials for proton exchange membrane fuel cells, in particular to a method for preparing a graphene conductive polymer coating on the surface of a bipolar plate by an electrodeposition method. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) have been valued for their great potential in zero-pollution transition of energy issues. Bipolar plates (BPs) account for 60%–80% of the total mass of the fuel cell, 70%–80% of the total volume, and 30%–45% of the total cost. Functions include: 1. Evenly distribute the reaction gas in the active area through the gas flow channel on the plate; 2. Provide mechanical support for the membrane electrode assembly; 3. Transfer current between battery components; 4. Remove water generated by the cathode; 5. .Prevent leakage of reaction gas; 6. Eliminate heat generated by gas reaction; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228H01M8/0213H01M8/0221C25D9/02C25D9/04C25D7/00
CPCH01M8/0228H01M8/0213H01M8/0221C25D9/02C25D9/04C25D7/00Y02E60/50
Inventor 李静
Owner UNIV OF SHANGHAI FOR SCI & TECH
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