Double polar plates for fuel battery and method for making surface carbon chromium thin film

A fuel cell and thin film preparation technology, which is applied in the direction of fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of accelerated corrosion, high material cost, and high energy consumption for processing, and achieve surface properties and corrosion resistance. Improved effect

Active Publication Date: 2008-09-03
CHANGZHOU INST OF DALIAN UNIV OF TECH
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Problems solved by technology

For example, Oak Ridge National Laboratory in the United States found that nickel-chromium alloys have better performance through the selection of substrate materials, and then performed high-temperature nitriding treatment on nickel-chromium alloys, which showed good electrical conductivity and corrosion resistance in the PEMFC environment, but there are still materials Problems such as high cost, complex process, and excessive energy consumption
[0006] Replacing scarce metals and their alloys with stainless steel as bipolar plates has the advantage of low cost, but there is a passivation film on the surface of stainless steel, which plays a positive role in improving corrosion resistance, but greatly increases the corrosion resistance of bipolar plates. Contact resistance, so that the battery heats up during operation, power is reduced and corrosion is accelerated, so if stainless steel is used as a bipolar plate, it must be surface modified

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  • Double polar plates for fuel battery and method for making surface carbon chromium thin film

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Effect test

Embodiment 1

[0022] Put the stainless steel thin plate bipolar plate into the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, install a pure chromium target partly on the cathode arc source position, partly install a pure graphite target, and vacuumize to 5×10 -3 Pa, pass argon gas to 0.4Pa, start the arc of chromium target and graphite target to obtain arc plasma, the arc current is 50A, add -800V×20kHz×60% pulse bias, and use the ions in the plasma to conduct the bipolar plate Ion sputtering to remove the passivation film for 10 minutes, reduce the bias voltage amplitude to -300V, adjust the arc flow of the chromium cathode to 80A and the arc flow of the graphite cathode to 40A, and start depositing the carbon chromium film for 40 minutes. Discharge the bias voltage, stop the arc, stop the gas, and keep the vacuum furnace cold for 1 hour. Finally, release the vacuum and take out the coated bipolar plate. In this way, a carbon-chromium modif...

Embodiment 2

[0024] Put the stainless steel thin plate bipolar plate into the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, install a pure chromium target partly on the cathode arc source position, partly install a pure graphite target, and vacuumize to 5×10 -3Pa, pass argon gas to 0.8Pa, add -800V×20kHz×40% pulse bias to trigger the glow plasma of the inert gas argon, and use the ions in the plasma to perform ion sputtering on the bipolar plate to remove the passivation film treatment For 10 minutes, reduce the bias voltage amplitude to -300V, change the partial pressure of argon to 0.4Pa, start the chromium cathode arc, set the arc current at 80A, then start the graphite cathode arc, set the arc current at 40A, and start depositing the first layer of carbon Then start to adjust the chromium arc flow. The adjustment method is carried out in a way that changes continuously with time. Within 35 minutes, the arc flow is uniformly and continuou...

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Abstract

The invention provides a bipolar plate for fuel cell and a surface carbon-chrome film preparation method which belong to fuel cell technique field. The bipolar plate is composed of a stainless steel thin plate substrate and its two sides carbon-chrome film; the carbon-chrome film thickness is micro-nanometer magnitude and is prepared by using electric arc ion filming method, therein, substrate passive film is removed by using ion sputtering method before filming, used ion comes from glow plasma of inert gases or electric arc plasma vaporized from metal target; a simple substance film with even component, a grads film with component changed continuously from inside to outside can be obtained by controlling filming parameter in film depositing process. The substrate provided by the invention is the stainless steel thin plate, and has a nitric-chrome film on surface. The stainless steel thin plate and carbon-chrome film match connects in atom dimension because of ion film depositing, thereby, the bipolar plate has characteristics of low-cost besides complex characteristics, for example, corrosion resistance, electrical conduction, strengthen and hydrophobic etc. The bipolar plate and preparation method are mainly suitable for fuel cell manufacturing field.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a bipolar plate for a proton exchange membrane fuel cell and its preparation technology. 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, Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of fast startup, long life and high specific power. All kinds of portable power sources are one of the ideal power sources for electric vehicles, other vehicles and even weapons. Therefore, the development of proton exchange membrane fuel cells plays a decisive role in the development of the entire new energy technology field. [0003] The bipolar plate is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02H01M4/88C23C14/34C23C14/38C23C14/06H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 林国强吴爱民吴博郭媛媛
Owner CHANGZHOU INST OF DALIAN UNIV OF TECH
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