Abstract
During actual vehicle applications, the condition of start-up/shut-down generates high cathodic potential, causing the anodic dissolution and having a great impact on the lifetime of proton exchange membrane fuel cell (PEMFC). In order to improve the durability of the bipolar plate at high potential, the present work investigated the oxygen-doped TiN coating deposited on the surface of SS316L matrix. The results of X-ray photoelectron spectroscopy and X-ray diffraction showed that TiNO and TiO2 existed in oxygen-doped coatings. The surface morphology analysis indicated that the oxygen-doped coatings tended to come into being denser surface. Besides, the tested results of potentiodynamic polarization, triangle wave high potential cyclic polarization, the electrochemical impedance spectrum and water contact angle test revealed that the TiNO-7sccm specimen possessed the best corrosion resistance, durability and surface hydrophobicity. After a long-term polarization (+0.6 VSCE), the TiNO-5sccm samples possessed the lowest interfacial contact resistance value of 19.8 mΩ cm2.
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