Bipolar plate of fuel cell and method for preparing carbon titanium nanocomposite film on surface thereof

A fuel cell and nanocomposite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inability to meet the high voltage requirements of electrolytic cells, inability to meet the requirements of voltage fluctuation operation, and high preparation costs, and achieve binding force. Strong, reduced contact resistance, significant effect

Inactive Publication Date: 2011-07-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL200410082726.0 uses electrochemical synthesis technology to electropolymerize conductive polymer film on the surface of stainless steel bipolar plate, which has achieved good results in improving corrosion resistance, but it still needs to be improved in reducing contact resistance; some studies have shown that in titanium plate The deposition of Au film, Pt / Ti film, etc. on the surface of the bipolar plate can also improve the conductivity and corrosion resistance of the bipolar plate to varying degrees, but it is still far from meeting the performance requirements for long-term stable operation in general, especially Coating materials involve precious metals (Au and Pt), which makes the preparation cost high; ZL200810086373X, ZL2008100863744, and ZL2008100863759 respectively prepare nitrogen-chromium, nitrogen-chromium-nickel and carbon-chromium films on the surface of stainless steel bipolar plates for modification, to a large extent The conductivity of the stainless steel bipolar plate is improved, but the corrosion resistance can only ensure the stability of the material when the working voltage is 0.6V-0.8V. After exceeding this voltage limit, the film will corrode, dissolve and fall off rapidly, which cannot meet the requirements of protons. The voltage fluctuation operation requirements of the exchange membrane fuel cell when the operation fluctuates, not to mention the high voltage requirement of 1.2V-1.5V of the electrolytic cell

Method used

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  • Bipolar plate of fuel cell and method for preparing carbon titanium nanocomposite film on surface thereof
  • Bipolar plate of fuel cell and method for preparing carbon titanium nanocomposite film on surface thereof

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Experimental program
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Embodiment 1

[0026]Put the stainless steel thin plate bipolar plate base material into the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, install the graphite target and the pure titanium target at intervals on the position of the cathode arc source, and vacuumize to 5×10- 3Pa, pass the argon gas to 1Pa, start the titanium target arc to obtain the arc plasma, the arc current is 50A, add the pulse bias voltage of -1000V×20kHz×60%, and at the same time trigger the glow plasma of argon gas, use the argon in the plasma Ions and titanium ions are used to remove the passivation film by ion sputtering on the bipolar plate for 10 minutes, reduce the bias voltage amplitude to -300V, adjust the titanium target arc flow to 80A and the graphite target arc flow to 40A, and start depositing carbon-titanium film. The time is 40 minutes. After the time is up, the post-processing of unloading the bias voltage, stopping the arc, stopping the gas, and keeping t...

Embodiment 2

[0028] Put the titanium thin plate bipolar plate base material into the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, install graphite targets and pure titanium targets at intervals on the position of the cathode arc source, and vacuumize to 5×10- 3Pa, pass argon gas to 1Pa, start the titanium target arc to obtain arc plasma, each titanium target arc current is 50A, add -800V×20kHz×60% pulse bias and simultaneously trigger the glow plasma of argon gas, use plasma The argon ions and titanium ions in the body perform ion sputtering on the bipolar plate to remove the passivation film for 10 minutes, reduce the bias voltage amplitude to -300V, change the argon partial pressure to 0.5Pa, stop the titanium arc, start the graphite arc, Adjust the flow of each graphite arc at 40A, start to deposit the first layer of carbon layer, then start the titanium arc after 60S, deposit the second layer of carbon-titanium layer, stop the titanium ...

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Abstract

The invention discloses a bipolar plate of a fuel cell and a method for preparing a carbon titanium nanocomposite film on the surface thereof, belongs to the technical field of surface modification of metallic materials and fuel cells, and relates to a bipolar plate of a regenerative fuel cell and a proton exchange membrane fuel cell and a preparation technology of a surface modified film of the bipolar plate. The bipolar plate consists of a metal thin plate substrate and carbon titanium nanocomposite films which are formed on the surfaces at two sides of the substrate, wherein the metal thin plate substrate is a titanium plate and a stainless steel plate; the carbon titanium nanocomposite film is an amorphous and nanocrystalline composite film which is prepared on an amorphous carbon substrate with an arc ion film plating method and on which titanium and titanium carbide nanocrystals are distributed; the thickness of the film is of micron dimension; and the size of the crystal grains of the nanocrystals is of micron dimension. The invention has the effects and advantages that: the bipolar plate is low in manufacturing cost, has prominent composite performance such as corrosion resistance, conductivity, hydrophobicity and the like, can be used for replacing a noble metal bipolar plate and a graphite bipolar plate, and can be used as a cell bipolar plate of the proton exchange membrane fuel cell and an electrolytic cell bipolar plate of the regenerative fuel cell.

Description

technical field [0001] The invention belongs to the technical field of metal material surface modification and fuel cell. The invention relates to a bipolar plate of a renewable fuel cell and a proton exchange membrane fuel cell and the preparation technology of the surface modified film. Background technique [0002] The fuel cell (Fuel Cell) can directly convert the chemical energy stored in the fuel and oxidant into electrical energy. It has high conversion efficiency, environmental friendliness, and high reliability. It is considered to be the preferred efficient and sustainable power generation technology in the 21st century. Among all kinds of fuel cells, the renewable fuel cell (Regenerative Fuel Cell Sectem, RFC) is currently the energy storage system with the highest specific energy. The water is electrolyzed into hydrogen and oxygen through the electrolytic cell, and then the hydrogen and oxygen are generated into water through the fuel cell to generate electric e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 林国强吕扬
Owner DALIAN UNIV OF TECH
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