Presentation Title

Graphene-Based Coatings on a Martensitic Stainless Steel for Proton Exchange Membrane Fuel Cells

Faculty Mentor

Dr. Vilupanur Ravi, Chemical and Materials Engineering, Cal Poly Pomona

Start Date

17-11-2018 1:30 PM

End Date

17-11-2018 1:45 PM

Location

C301

Session

Oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Proton exchange membrane fuel cells (PEMFCs) are clean and efficient power resources. They only emit water vapor, thereby offering a viable approach to reduce greenhouse gas emissions. Challenges remain in making these power sources cost competitive. A crucial component of these fuel cells - the graphite separator plates - offer excellent corrosion resistance but are expensive and prone to fracture. They are also difficult to shape into thin sheets. Since these graphite separator plates account for about 60% of the cost of the fuel cell, an economical alternative should significantly reduce costs. Metallic substrates offer such a possibility. However, potential candidates for this application must be both corrosion resistant and electrically conductive. In this study, the surface of a martensitic stainless steel, UNS S41000, was modified to achieve enhanced corrosion resistance while retaining high electrical conductivity, ductility and low cost of the substrates. A graphene-based coating was selected as a promising candidate for modifying the surface of selected stainless steels. As-received and surface modified test coupons were subjected to electrochemical tests using a three-electrode flat cell in a simulated PEMFC environment, i.e. 0.01 M sulfuric acid, at 70°C. Scanning electron microscopy and X-ray diffraction were used to characterize the surface of the test coupons. Current results indicate that the surface modified coupons offer higher corrosion resistance than the as-received coupons.

Keywords: graphene, reduced graphene oxide, graphene oxide, PEM, proton exchange membrane fuel cell, ferritic steels, SS410, UNS S41000, corrosion

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Nov 17th, 1:30 PM Nov 17th, 1:45 PM

Graphene-Based Coatings on a Martensitic Stainless Steel for Proton Exchange Membrane Fuel Cells

C301

Proton exchange membrane fuel cells (PEMFCs) are clean and efficient power resources. They only emit water vapor, thereby offering a viable approach to reduce greenhouse gas emissions. Challenges remain in making these power sources cost competitive. A crucial component of these fuel cells - the graphite separator plates - offer excellent corrosion resistance but are expensive and prone to fracture. They are also difficult to shape into thin sheets. Since these graphite separator plates account for about 60% of the cost of the fuel cell, an economical alternative should significantly reduce costs. Metallic substrates offer such a possibility. However, potential candidates for this application must be both corrosion resistant and electrically conductive. In this study, the surface of a martensitic stainless steel, UNS S41000, was modified to achieve enhanced corrosion resistance while retaining high electrical conductivity, ductility and low cost of the substrates. A graphene-based coating was selected as a promising candidate for modifying the surface of selected stainless steels. As-received and surface modified test coupons were subjected to electrochemical tests using a three-electrode flat cell in a simulated PEMFC environment, i.e. 0.01 M sulfuric acid, at 70°C. Scanning electron microscopy and X-ray diffraction were used to characterize the surface of the test coupons. Current results indicate that the surface modified coupons offer higher corrosion resistance than the as-received coupons.

Keywords: graphene, reduced graphene oxide, graphene oxide, PEM, proton exchange membrane fuel cell, ferritic steels, SS410, UNS S41000, corrosion