Method for preparing carbon membrane on surface of stainless steel bipolar plate by using graphite as carbon source

A technology of stainless steel and bipolar plates, which is applied in the manufacture of final products, fuel cell components, sustainable manufacturing/processing, etc., and can solve the problems of increased surface contact resistance of metal ions

Pending Publication Date: 2020-03-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In order to solve the outstanding problems such as the corrosion of stainless steel bipolar plates to form metal ions and the increase of surface contact resistance during the use of PEMFC, and to improve the corrosion res

Method used

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  • Method for preparing carbon membrane on surface of stainless steel bipolar plate by using graphite as carbon source
  • Method for preparing carbon membrane on surface of stainless steel bipolar plate by using graphite as carbon source
  • Method for preparing carbon membrane on surface of stainless steel bipolar plate by using graphite as carbon source

Examples

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example 1

[0037] Commercial stainless steel was polished to remove the oxide film on the surface, and the grease on the surface was removed by ultrasonication in an alcohol solution for 30 minutes, and then cleaned with deionized water and dried with a hair dryer for storage.

[0038] The composition of the stainless steel electrochemical deposition carbon film solution is potassium nitrate solution, the pH is adjusted to 12±0.5 with potassium hydroxide, and the concentration of potassium nitrate is 0.5M. 1 mL of methanol was added dropwise to the above solution. The solution temperature was maintained at 40±2°C. A constant current source was used as the power source for the electrochemical deposition of the carbon film, with stainless steel as the cathode and graphite rod as the anode. The above electrodes are properly connected to the power supply and immersed in the potassium nitrate solution to form the experimental device. Then choose the current density as 15mA / cm 2 The carbon ...

example 2

[0040] Commercial stainless steel was polished to remove the oxide film on the surface, and the grease on the surface was removed by ultrasonication in an alcohol solution for 30 minutes, and then cleaned with deionized water and dried with a hair dryer for storage.

[0041] The stainless steel electrochemical deposition carbon film solution is composed of potassium nitrate solution, the pH is adjusted to 1±0.5 with nitric acid, and the concentration of potassium nitrate is 1.0M. 5.0 mL of methanol was added dropwise into the above solution. The solution temperature was maintained at 50±2°C. A constant current source was used as the power source for the electrochemical deposition of the carbon film, with stainless steel as the cathode and graphite rod as the anode. Connect the above electrodes to the power supply correctly and immerse in the potassium nitrate solution as the experimental device. Then choose the current density as 40mA / cm 2 The carbon film is deposited, and ...

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Abstract

The invention relates to a method for preparing a carbon membrane on the surface of a stainless steel bipolar plate by using graphite as a carbon source, belongs to the technical field of fuel cells and is used for being applied to a proton exchange membrane fuel cell (PEMFC). The method is characterized by comprising the steps of 1, polishing commercial stainless steel to remove a surface oxide layer, deoiling, cleaning with deionized water, and drying for later use; 2, preparing a nitrate (such as potassium nitrate and sodium nitrate) solution with a certain concentration; 3, performing electrochemical deposition by using a two-electrode system to form a carbon membrane, wherein the stainless steel serves as a cathode, graphite serves as an anode, and the solution temperature, the treatment current density and the treatment time are strictly controlled in the experiment process, and cleaning the treated stainless steel sample with deionized water to remove residual electrolyte, and then drying; and 4, carrying out vacuum heat treatment on the dried stainless steel sample loaded with the carbon membrane. The performance of the carbon membrane-loaded stainless steel metal bipolar plate prepared according to the steps is significantly improved, and the manufacturing cost of the fuel cell is expected to be reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a method for manufacturing a PEMFC stainless steel bipolar plate with low contact resistance and low corrosion current, in particular to a constant-current electrochemical deposition of a carbon film in a nitrate solution using graphite as a carbon source for PEMFC Method for surface modification of stainless steel bipolar plates. Background technique [0002] The energy structure directly determines the trajectory and speed of the development of human civilization. Modern industrial civilization is built on the basis of fossil energy such as coal and oil. The first characteristic of fossil energy is that it is non-renewable and has limited global reserves. In addition, the combustion of fossil fuels produces a large amount of greenhouse gases such as CO and nitrogen oxides. What is more urgent is that the current use of fossil energy will produce serious environmental polluti...

Claims

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Application Information

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IPC IPC(8): H01M8/0213H01M8/021H01M8/0228C25D9/10
CPCH01M8/0213H01M8/021H01M8/0228C25D9/10Y02P70/50Y02E60/50
Inventor 王新东崔红兵王萌耿赛赛
Owner UNIV OF SCI & TECH BEIJING
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