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- Title
Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates.
- Authors
Shi, Kun; Li, Xue; Zhao, Yang; Li, Wei-Wei; Wang, Shu-Bo; Xie, Xiao-Feng; Yao, Li; Jensen, Jens Oluf; Li, Qing-Feng
- Abstract
To improve corrosion resistance and electronic conductivity of bipolar plates for proton exchange membrane fuel cell (PEMFC), coatings of TiNb and TiNbN on 316L stainless steel (SS) were prepared by magnetron sputtering. X-ray diffraction (XRD) measurements confirmed the existence of metallic nitrides in the TiNbN coating. Scanning electron microscope (SEM) tests showed that the deposited coatings provided smooth surfaces. Further electrochemical measurements indicated that the corrosion resistance of TiNb coating was significantly higher than that of substrate. At 0.19 V vs MSE, the long-term stabilized current density of TiNb/316L SS was lower than 1 μA·cm−2. The interfacial contact resistance (ICR) values between coating and carbon paper suggested that TiNb and TiNbN films had better contact conductivity than 316L SS substrate. In conclusion, TiNb coated 316L SS metallic bipolar plate material is a promising option for PEMFC.
- Subjects
STAINLESS steel; METAL coating; PROTON exchange membrane fuel cells; SCANNING electron microscopes; CARBON paper
- Publication
Applied Sciences (2076-3417), 2019, Vol 9, Issue 12, p2568
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app9122568