Stainless steel double-polar plate surface modifying method for proton exchange film fuel battery

Abstract

The present invention provides a surface modification method of stainless steel bipolar plate of proton exchange membrane fuel cell belonged to field of energy source. Injecting nickel ion to stainless steel plate by ion injection method, forming injection layer at range of several decade nanometer on surface of stainless plate, and modified stainless steel bipolar plate is obtained. The present invention can improve corrosion resistance, reduce contact resistance of metal bipolar plate and gas diffusion layer to meet the acquirement of development of proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a preparation method in the technical field of fuel cells, in particular to a method for surface modification of a stainless steel bipolar plate of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) uses perfluorosulfonic acid solid polymer as electrolyte, platinum / carbon or platinum-ruthenium / carbon as electrocatalyst, hydrogen or purified reformed gas as fuel, air or pure oxygen as oxidant, It is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy with an operating temperature of 60-100°C. 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 a...

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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] found through literature search of the prior art, (H.Wang et al.) in > (Energy Magazine) (2004 Issue 138 79-85 pages) ("Thermallynitrided stainless steel for polymer electrolyte membrane fuel cell bipolar plate Part 2: Beneficial modification of passive layer on AISI446") (Thermallynitrided stainless steel for polymer electrolyte membrane fuel cell 2: AISI446 stainless steel Beneficial modification of chemical film) 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

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