Nanocomposite-carbon coated at low-temperature: A new coating material for metallic bipolar plates of polymer electrolyte membrane fuel cells |
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Authors: | S.H. Lee V.E. Pukha V.E. Vinogradov N. Kakati S.H. Jee S.B. Cho Y.S. Yoon |
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Affiliation: | 1. Department of Environment and Energy Engineering, Gachon University, 1342 Seongnamdaero, Gyeonggi-do 461-710, Republic of Korea;2. Department of Materials Science and Engineering, Yonsei University, Seoul 120-740, Republic of Korea;3. National Technical University, Kharkov Polytechnic Institute, Frunze Street 21, Kharkov 61002, Ukraine;4. Advanced Technology Research Center, Agency for Defense Development, Yuseong, Daejeon 305-600, Republic of Korea |
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Abstract: | A nanocomposite-carbon layer is coated onto the surface of 316L stainless steel (SS316) using a beam of accelerated C60 ions at low temperature. The coating is composed of textured graphite nanocrystals ranging in size from 1 to 2 nm, with the graphene plane normal to the coating plane; the nanocrystals are separated by amorphous carbon. This orientation of the graphene layer provides low film resistivity in the direction of the substrate normal. Corrosion resistance tests performed in aggressive anodic and cathodic environments of a polymer electrolyte membrane fuel cell (PEMFC) show that the nanocomposite-carbon coated SS316L exhibits better anticorrosion properties than does bare SS316L. The interfacial contact resistance (ICR) of the nanocomposite-carbon coated SS316L is 12 mΩ cm2, which is similar to that of graphite at a compaction force of 150 N cm−2 and lower than a target of ∼20 mΩ cm2. A low value of ICR is maintained even after corrosion tests in aggressive anodic and cathodic environments. The fabricated nanocomposite-carbon coated SS316L exhibits excellent corrosion resistance and low interfacial contact resistance under simulated PEMFC bipolar plate conditions. |
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Keywords: | Bipolar plates Stainless steel Corrosion behavior Electrical properties Fuel cell |
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