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A kind of substrate coated with composite film and its preparation method and application

A composite film and surface coating technology, applied in the field of hydrogen energy, can solve the problems of gas transmission battery self-start failure, poor conductivity passivation film, bipolar plate flow channel blockage, etc., to prolong the anti-icing time, and the method is simple , Improve the effect of corrosion resistance

Active Publication Date: 2021-07-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the working environment of fuel cells, a passivation film with poor conductivity will be formed on the surface of the stainless steel bipolar plate, and it is also prone to corrosion and ionization of metal ions that pollute the proton exchange membrane.
Moreover, the problem of icing in the flow channel of the bipolar plate caused by the low temperature environment and blocking the gas transmission will cause the battery to fail to start.

Method used

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  • A kind of substrate coated with composite film and its preparation method and application
  • A kind of substrate coated with composite film and its preparation method and application
  • A kind of substrate coated with composite film and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a substrate with a surface-coated diamond-like vertical carbon nanotube composite film, based on plasma-enhanced chemical vapor deposition equipment, said method comprising the steps of:

[0031] S1. Select 304 stainless steel as the substrate, polish it with sandpaper, and then ultrasonically pre-clean it with acetone, ethanol and deionized water for 10 minutes;

[0032] S2. Put the cleaned substrate into the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, evacuate the reaction chamber to a pressure of 50 mT, and feed hydrogen gas with a flow rate of 10 sccm to maintain the pressure in the reaction chamber at 100 mT. Turn on the radio frequency, and the radio frequency The power is 200W, generating hydrogen plasma to clean the surface of the substrate, and the cleaning time is 15min;

[0033] S3. Turn off the radio frequency after cleaning the substrate, maintain the flow rate of hydrogen gas at 10 sccm, and raise the...

Embodiment 2

[0040] A method for preparing a substrate with a surface-coated diamond-like vertical carbon nanotube composite film, based on plasma-enhanced chemical vapor deposition equipment, said method comprising the steps of:

[0041] S1. Select 304 stainless steel as the substrate, polish it with sandpaper, and then ultrasonically pre-clean it with acetone, ethanol and deionized water for 8 minutes;

[0042] S2. Put the cleaned substrate into the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, evacuate the reaction chamber to a pressure of 80mT, and feed hydrogen gas with a flow rate of 10sccm to maintain the pressure in the reaction chamber at 100mT. Turn on the radio frequency, radio frequency The power is 180W, and the hydrogen plasma is generated to clean the surface of the substrate again, and the cleaning time is 10 minutes;

[0043] S3. Turn off the radio frequency after the substrate cleaning is completed, maintain the flow rate of hydrogen gas at ...

Embodiment 3

[0047] A method for preparing a substrate with a surface-coated diamond-like vertical carbon nanotube composite film, based on plasma-enhanced chemical vapor deposition equipment, said method comprising the steps of:

[0048] S1. Select 304 stainless steel as the substrate, polish it with sandpaper, and then ultrasonically pre-clean it with acetone, ethanol and deionized water for 15 minutes;

[0049] S2. Put the cleaned substrate into the reaction chamber of the plasma-enhanced chemical vapor deposition equipment, evacuate the reaction chamber to a pressure of 100mT, feed hydrogen gas with a flow rate of 10 sccm, turn on the radio frequency, and the power of the radio frequency is 220W to generate hydrogen plasma Clean the substrate surface again for 10 minutes;

[0050] S3. After cleaning the substrate, turn off the radio frequency, maintain the flow rate of hydrogen gas at 10 sccm, and at the same time raise the temperature to the growth temperature of diamond-like carbon a...

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Abstract

The invention belongs to the technical field of hydrogen energy, and specifically relates to a diamond-like-vertical carbon nanotube composite film directly grown on a stainless steel surface, a preparation method and application thereof. The method of the present invention prepares the substrate of the diamond-like carbon nanotube composite film whose surface is coated, completes the entire growth process in the PECVD reaction chamber, and the possibility of sample contamination is low. The method is simple, and the diamond-like film and the film are completed in one step. The simultaneous growth of vertical carbon nanotubes does not require various complicated equipment; the composite film prepared by the present invention has both diamond-like and vertical carbon nanotube structures, and the carbon nanotubes themselves have excellent electrical conductivity and the vertical structure can make the modified The surface of the stainless steel achieves a super-hydrophobic effect, and the dense diamond-like film can effectively protect the surface of the stainless steel from being invaded by corrosive liquids and improve the corrosion resistance of the bipolar plate; the stainless steel coated with a composite film of diamond-like vertical carbon nanotubes is suitable for processing in low-temperature environments Bipolar plates for fuel cells.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy, in particular to a diamond-like carbon-vertical carbon nanotube composite film directly grown on a stainless steel surface and a preparation method and application thereof. Background technique [0002] Energy is the material basis for human survival and an important guarantee for the sustainable development of society. However, with the continuous progress of industrialization, energy issues have become one of the inevitable important issues in today's society. At present, the main way for human beings to use energy is to convert the chemical energy in non-renewable fossil fuels into required energy through fuel. However, the limited reserves of fossil energy and the pollution caused to the environment will definitely restrict the healthy development of human society. As people gradually realize the energy crisis and environmental crisis brought about by traditional fossil fuels, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/26C23C16/455C23C16/505H01M8/0228H01M8/0213H01M8/0206B82Y30/00
CPCY02E60/50
Inventor 鲁聪达史枫烨潘婷金晶黄仪颜佳晴
Owner ZHEJIANG UNIV OF TECH
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