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Research of Surface Modification on Stainless Steel as Bipolar Plate of PEMFC

Author: PanHuanHuan
Tutor: LiYing;XuHongFeng
School: Dalian Jiaotong University
Course: Environmental Science
Keywords: Proton exchange membrane fuel cell Stainless steel (SS) Bipolar plates Contact resistance Corrosion
CLC: TM911.48
Type: Master's thesis
Year: 2008
Downloads: 174
Quote: 3
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Abstract


Proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC) is an efficient chemical fuel and oxidant can be directly converted into electrical energy. The PEMFC its high energy density, environment-friendly and energy conversion and high expected widely used in mobile power and stationary power plants and other areas in the future. One of the key components of the PEMFC is a bipolar plate. The quality of the bipolar plate will directly determine the size and length of life of the fuel cell stack output power, which not only has high electrical conductivity, corrosion resistance, low density, high mechanical strength and resistance to gas permeability, and must have low material cost, ease of processing, good dimensional stability and other characteristics, and should also be a good conductor of heat, so as to ensure the smooth discharge of the internal temperature of the cell stack evenly distributed and waste heat. Stainless steel for its excellent machining and gas impermeable particularly suitable as a bipolar plate material, but because of its poor corrosion resistance, the presence of a surface passivation film and increase the contact resistance, the stainless steel can not be directly applied, need The surface modification, in order to improve corrosion resistance and reduce contact resistance. 316 stainless steel sheet material, the use of the preparation process in the chemical conversion coating after chemical conductive passivation method modifier AgNO 3 and HNO 3 mixture , silver plated stainless steel surface chemistry, under simulated PEMFC environment, to reduce the contact resistance at the same time to enhance the corrosion resistance of stainless steel. Contact resistance testing at pressures up to 150N · cm -2 , the contact resistance between the preparation of chemical conversion coating stainless steel electrode diffusion layer achieve 20mΩ · cm 2 about 10 times lower than before treatment; After contact resistance after a silver-plated little change, but still declined, basically reached about 16mΩ · cm 2 ; super depth of the surface morphology of the microscope tests show stainless steel surface treatment presents a uniform gray grid-like film surface pits is covered signs: EDS tests have shown that the stainless steel the eclipse hole containing trace Ag element; the XRD tests show treated stainless steel conductive enhanced because Fe 0.64 Ni 0.36 the same plane index different from the relative percentage content, and the presence of the stability of the stainless steel internal elemental metal complexes; etching solution in the simulated PEMFC environment, the open-circuit potential - time curve modified stainless steel open circuit potential was improved to a certain extent, shows higher electrical properties; potentiodynamic polarization curves show that the corrosion potential of the stainless steel after treatment significantly improved the corrosion current density than untreated stainless steel reduce by nearly two orders of magnitude; the the potentiostatic oxidation curve test seen the silver-plated stainless steel corrosion current density than untreated stainless significantly reduce.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell > Ion-exchange membrane fuel cell
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