Investigation of Hydrogen Permeability in Metallic Materials for Bipolar Plates with Noble Coatings for PEMFC/ PEMWC Systems
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The growing demand for durable PEM systems (PEMFCs and PEMWEs) has emphasized the significance of corrosion resistance and hydrogen uptake characteristics in metallic bipolar plates. To mitigate degra- dation in corrosive environments, noble metal coatings such as platinum (Pt) and gold (Au) have been applied; however, their effects on hydrogen permeation are not well understood. This study evaluates the hydrogen permeation characteristics of STS470, STS316L, and a titanium alloy using the Devanathan–Sta- churski electrochemical method, both in bare form and with noble metal coatings. Thin layers of Pt and Au were deposited via sputtering, and testing was performed in simulated acidic electrolyte environments rel- evant to PEM operation. The results revealed that STS470 had the highest hydrogen permeability, while the titanium alloy exhibited the lowest. Both Pt and Au coatings significantly reduced hydrogen perme- ation, with Pt demonstrating slightly better performance. Furthermore, these coatings improved corrosion resistance under harsh electrochemical conditions. These findings highlight the dual role of noble metal coatings in reducing hydrogen uptake and enhancing corrosion resistance, providing valuable insights for designing advanced metallic bipolar plates in next-generation PEM systems.
Abstract
The growing demand for durable PEM systems (PEMFCs and PEMWEs) has emphasized the significance of corrosion resistance and hydrogen uptake characteristics in metallic bipolar plates. To mitigate degra- dation in corrosive environments, noble metal coatings such as platinum (Pt) and gold (Au) have been applied; however, their effects on hydrogen permeation are not well understood. This study evaluates the hydrogen permeation characteristics of STS470, STS316L, and a titanium alloy using the Devanathan–Sta- churski electrochemical method, both in bare form and with noble metal coatings. Thin layers of Pt and Au were deposited via sputtering, and testing was performed in simulated acidic electrolyte environments rel- evant to PEM operation. The results revealed that STS470 had the highest hydrogen permeability, while the titanium alloy exhibited the lowest. Both Pt and Au coatings significantly reduced hydrogen perme- ation, with Pt demonstrating slightly better performance. Furthermore, these coatings improved corrosion resistance under harsh electrochemical conditions. These findings highlight the dual role of noble metal coatings in reducing hydrogen uptake and enhancing corrosion resistance, providing valuable insights for designing advanced metallic bipolar plates in next-generation PEM systems.