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Preparation method of hydrophilic porous graphite water transport plate and water transport plate thereof

A technology of porous graphite and water transport plates, used in fuel cells, electrochemical generators, electrical components, etc.

Active Publication Date: 2017-06-23
国创氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the water transfer plate prepared by this method has good bubble pressure, water permeability, plane resistivity and compressive yield strength, the preparation process requires high temperature above 2000 ° C for graphitization

Method used

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  • Preparation method of hydrophilic porous graphite water transport plate and water transport plate thereof
  • Preparation method of hydrophilic porous graphite water transport plate and water transport plate thereof
  • Preparation method of hydrophilic porous graphite water transport plate and water transport plate thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: 50ml of sodium nitrate solution (0.1mol / L) and 5g of ethyl orthosilicate were mixed and stirred for 30min. After TEOS is completely dissolved, slowly add hydrochloric acid solution (0.1mol / L) dropwise until the pH value is close to 2, and then stir for 1 hour under the greenhouse to obtain the electrodeposition precursor solution. A porous carbon plate with an average pore diameter of 7 μm is placed in the precursor solution of electro-assisted deposition, the porous carbon plate is used as the working electrode, the dense and smooth graphite plate is used as the reference electrode and the counter electrode, and a constant voltage is applied to the working electrode by the constant voltage method- Electro-assisted deposition was performed at 3.5V for 120s, and the hydrophilized porous carbon plate was calcined at 400°C for 1 hour to obtain a porous hydrophilic graphite water transport plate.

Embodiment 2

[0021] Example 2: 50ml of potassium nitrate solution (0.2mol / L) and 5g of ethyl orthosilicate were mixed and stirred for 30min. After TEOS is completely dissolved, slowly add sulfuric acid solution (0.1mol / L) dropwise until the pH value is close to 3, and then stir for 1 hour under the greenhouse to obtain the electrode-assisted deposition precursor solution. A porous graphite plate with an average pore diameter of 7 μm was placed in the electro-assisted deposition precursor solution (the electro-assisted deposition precursor liquid was submerged in the porous graphite plate), the porous graphite plate was used as the working electrode, and the dense and smooth graphite plate was used as the reference electrode and counter electrode. The constant current method applies a constant current of 200mA cm on the working electrode -2 Electro-assisted deposition was performed for 200s, and the hydrophilized porous graphite plate was calcined at 400° C. for 2 hours at a high temperatur...

Embodiment 3

[0022] Example 3: 100ml of sodium nitrate solution (0.2mol / L) and 5g of butyl titanate were mixed and stirred for 30min. After TEOS is completely dissolved, slowly add hydrochloric acid solution (0.1mol / L) dropwise until the pH value is close to 4, and then stir for 1 hour in the greenhouse to obtain the electrodeposition precursor solution. A porous graphite plate with an average pore diameter of 5 μm was placed in the electro-assisted deposition precursor solution (the electro-assisted deposition precursor liquid was submerged in the porous graphite plate), the porous graphite plate was used as the working electrode, and the dense and smooth graphite plate was used as the reference electrode and counter electrode. The pulse voltage method applies a pulse voltage on the working electrode, the pulse range is (-3)-0V for electro-assisted deposition, the pulse time interval is 1ms, and the number of pulses is 200 times. Calcined for 2 hours, the porous hydrophilic graphite water...

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Abstract

The invention discloses a preparation method of a hydrophilic porous graphite water transport plate and a water transport plate thereof. The method comprises the following steps: a hard porous graphite plate after pretreatment is placed in a precursor solution of electrically assisted deposition, and a layer of uniform hydrophilic layer is deposited in apertures by the electrically assisted deposition method. The porous graphite plate which is treated by hydrophilization is used as a solid polymer electrolyte fuel cell water transport plate, the plate has good characteristics of water permeability, gas blocking, conductivity and compressive strength, and the like, and the product can effectively alleviate water shortage and water logging of cells, and improves cell performance and stability. Deposition amount of hydrophilic oxides in the producing process of the water transport plate is controllable.

Description

technical field [0001] The invention relates to the technical field of fuel cells, and belongs to a preparation method of a fuel cell porous bipolar plate, in particular to a graphite porous hydrophilic plate for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] With its high energy density and low pollution, fuel cells are expected to become the mainstream instead of fossil energy power generation in the future. PEMFC has the advantages of fast start-up at room temperature, no electrolyte loss, low noise, etc., and has the potential to be used as a mobile power supply, various portable power supplies and uninterruptible power supplies. During the operation of PEMFC, the cathode will produce water, which must be discharged from the battery, otherwise it will cause water flooding on the cathode side and affect the gas transmission. The electromigration of hydrogen ions from the anode to the cathode will take away part of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04119
CPCH01M8/04082Y02E60/50
Inventor 邵志刚郭晓倩王志强曾亚超秦晓平瞿丽娟
Owner 国创氢能科技有限公司
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