Journal
JOURNAL OF POWER SOURCES
Volume 282, Issue -, Pages 248-256Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.055
Keywords
Graphene; Stainless steel; Corrosion; Passivation; Coatings
Funding
- National Science Council Taiwan [NSC102-2917-I-606-001, NSC 102-2221-E-606-014, NSC102-2221-E-155-021]
- Chang Gung Memorial Hospital [CMRPD2C0013]
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In this study, the growth of graphene by chemical vapor deposition (CVD) on SUS304 stainless steel and on a catalyzing Ni/SUS304 double-layered structure was investigated. The results indicated that a thin and multilayered graphene film can be continuously grown across the metal grain boundaries of the Nil SUS304 stainless steel and significantly enhance its corrosion resistance. A 3.5 wt% saline polarization test demonstrated that the corrosion currents in graphene-covered SUS304 were improved fivefold relative to the corrosion currents in non-graphene-covered SUS304. In addition to enhancing the corrosion resistance of stainless steel, a graphene coating also ameliorates another shortcoming of stainless steel in a corrosive environment: the formation of a passive oxidation layer on the stainless steel surface that decreases conductivity. After a corrosion test, the graphene-covered stainless steel continued to exhibit not only an excellent low interfacial contact resistance (ICR) of 36 m Omega cm(2) but also outstanding drainage characteristics. The above results suggest that an extremely thin, lightweight protective coating of graphene on stainless steel can act as the next-generation bipolar plates of fuel cells. (C) 2015 Elsevier B.V. All rights reserved.
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