Optimisation of pack chromised stainless steel for proton exchange membrane fuel cells bipolar plates using response surface methodology

Abdul-Ghani Olabi, Khaled Benyounis, Joseph Stokes, Atinuke Oladoye, James Carton

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)
    208 Downloads (Pure)

    Abstract

    Stainless steels, as low cost materials, are attractive for proton exchange membrane fuel cells (PEMFC) bipolar plates. However, these metallic alloys require surface coatings or treatments to enhance its corrosion resistance and surface conductivity in PEMFC environments. In this study, response surface methodology based on Box–Behnken design was employed to investigate the influence of time, activator content and temperature on corrosion current density of pack chromised 304 stainless steel in simulated PEMFC environment of aerated 0.5 M H2SO4 + 2 ppm HF at 70 °C. These process parameters were optimised and the performance of the optimised coatings in simulated and real PEMFC environments was investigated. The results indicated that temperature
    had the most significant influence on the performance of chromised coatings in the selected PEMFC environment. The optimised coating produced at 1040 °C for 3 hours with powder containing 6.84 wt% activator content exhibited better corrosion resistance than the substrate in typical PEMFC cathode and anode environments respectively as well as about six fold decrease in the contact resistance of the substrate at 150 N/cm2. Hence, the single fuel cell assembled with the bipolar plate coated with the optimised process parameters exhibited a two-fold increase in the maximum power density of the cell with the uncoated bipolar plates.
    Original languageEnglish
    Pages (from-to)384–392
    Number of pages9
    JournalSurface & Coatings Technology
    Volume304
    Early online date9 Jul 2016
    DOIs
    Publication statusPublished - 25 Oct 2016

    Keywords

    • pack chromising coatings
    • 304 stainless steel
    • Box-Behnken design
    • corrosion resistance
    • bipolar plate

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