Composite ion injection method for dual polar plates of proton exchange membrane fuel cell

Abstract

The invention relates to a method for injecting compound ions of a bipolar plate of a proton exchange membrane fuel cell in the technical field of fuel cells. The bipolar plate is composed of a surface modification layer and substrate stainless steel. By adopting the method of the ion injection, the ions in arbitrary combination of two elements of nickel, chromium and copper or of all three elements are injected into a stainless steel thin plate, and an injection layer is formed on the surface of the stainless steel thin plate within the range of dozens of nanometer, so as to obtain a modified stainless steel bipolar plate. The invention has the advantages that the corrosion resistance performance of a metallic bipolar plate can be further improved, the contact resistance of the metallic bipolar plate with a gas diffusion layer (carbon paper) can be reduced, a thinner bipolar plate can be produced, and the weight ratio energy and the volume ratio energy of a fuel cell can be increased, so as to satisfy the development requirement on the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a method for modifying the surface of a pole plate in the technical field of fuel cells, in particular to a compound ion implantation method for a bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that uses hydrogen as fuel, air or pure oxygen as oxidant, and the working temperature is generally 60-100°C to directly convert the chemical energy in fuel and oxidant into electrical energy. In the context of increasingly serious global environmental pollution and the depletion of fossil energy, it has attracted the attention of governments and research institutions because of its advantages of high efficiency, energy saving, safety, and environmental protection. With the application of PEMFC in automobiles and other vehicles, as a new generation of energy technology, it will gradually penetrate into all walks of life in societ...

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Problems solved by technology

Gold and nickel plates are used in metal bipolar plates of proton exchange membrane fuel cells due to their excellent corrosion resistance and low surface contact resistance, but their disadvantages are high cost and great difficulty in commercial production

[0004] Through document retrieval to prior art, H.Wang et al. published "Thermally nitrided stainless steel for polymer electrolyte membrane fuel" on "Journal of Power Sources" (Energy Magazine) (2004, 138 pages 79-85) cell bipolar plate Part 2: Beneficial modification of passive layer on AISI446" (thermal nitriding stainless steel used as proton exchange membrane fuel cell 2: beneficial modification of passive layer on AISI446 stainless steel) pointed out that nitriding at 1100°C for 2 hours can significantly improve The corrosion resistance of stainless steel, but its disadvantage is that too high temperature will cause thermal deformation of the stamped stainless steel bipolar plate

Although its corrosion potential has moved positively and the passivation current has decreased, the TiN coating has certain coating defects. From the perspective of long-term working environment, the anti-corrosion performance is limited.

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