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http://dx.doi.org/10.14478/ace.2021.1089

Effect of SUS316L Bipolar Plate Corrosion on Contact Resistance and PEMFC Performance  

Kim, Junseob (School of Chemical Engineering, University of Ulsan)
Kim, Junbom (School of Chemical Engineering, University of Ulsan)
Publication Information
Applied Chemistry for Engineering / v.32, no.6, 2021 , pp. 664-670 More about this Journal
Abstract
Stainless steel was applied as bipolar plate (BP) of polymer electrolyte membrane fuel cell (PEMFC) due to high mechanical strength, electrical conductivity, and good machinability. However, stainless steel was corroded and increased contact resistance resulting PEMFC performance decrease. Although the corrosion resistance could be improved by surface treatment such as noble metal coating, there is a disadvantage of cost increase. The stainless steel corrosion behavior and passive layer influence on PEMFC performance should be studied to improve durability and economics of metal bipolar plate. In this study, SUS316L bipolar plate of 25 cm2 active area was manufactured, and experiments were conducted for corrosion behavior at an anode and cathode. The influence of SUS316L BP corrosion on fuel cell performance was measured using the polarization curve, impedance, and contact resistance. The metal ion concentration in drained water was analyzed during fuel cell operation with SUS316L BP. It was confirmed that the corrosion occurs more severely at the anode than at the cathode for SUS316L BP. The contact resistance was increased due to the passivation of SUS316L during fuel cell operation, and metal ions continuously dissolved even after the passive layer formation.
Keywords
PEMFC; Bipolar plate; Corrosion; Contact resistance;
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