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Title: Corrosion resistance of functionally graded TiN/Ti coatings for proton exchange membrane fuel cells

Journal Article · · International Journal of Hydrogen Energy
ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [5]; ORCiD logo [5];  [2]; ORCiD logo [2]
  1. Univ. of Sao Paulo (Brazil). Escola Politecnica. Dept. de Engenharia Metalurgica e de Materiais; Centro Estadual de Educacao Tecnologica “Paula Souza”, Sao Paulo (Brazil). Faculdade de Tecnologia de Cotia
  2. Univ. of Sao Paulo (Brazil). Escola Politecnica. Dept. de Engenharia Metalurgica e de Materiais
  3. Montanuniversitaet Leoben (Austria)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  5. Universidade do Estado de Santa Catarina, Joinville-SC (Brazil). Lab. of Plasmas, Films and Surfaces

Bipolar Plates (BPP) are important components of proton exchange membrane fuel cell (PEMFC) stacks. In the development of innovative fuel cell designs, it is advantageous to use aluminum for these applications, however, this material lacks the necessary corrosion resistance. Since the performance of PEMFC stacks depends on BPP properties, in particular, corrosion resistance, depositing titanium nitride (TiN) thin films onto aluminum substrates may improve their efficiency and durability. Present work focuses on improving corrosion resistance and hydrophobicity of TiN/Ti by using N graded films deposited onto aluminum substrates (AA-1100) by grid-assisted magnetron sputtering (GAMS). Electrochemical impedance spectroscopy (EIS) with potentiodynamic and potentiostatic polarization are used to investigate the performance of the substrate/film system at room temperature and 70 oC, thus simulating a prototypic PEMFC electrolyte environment. Electrochemical test results showed that graded TiN films improved corrosion resistance when compared with both the homogeneous films and the AA1100 uncoated substrate. Furthermore, contact angle results reveal improved hydrophobicity for both homogeneous and graded TiN coatings when compared with the AA1100 substrate.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Foundation of Support for Research and Innovation of the Santa Catarina State (FAPESC); Brazilian National Research, Technology and Innovation Council
Grant/Contract Number:
AC05-00OR22725; AC05-06OR23100; 308565/2018-5; PAP-TR-781
OSTI ID:
1787009
Alternate ID(s):
OSTI ID: 1809563
Journal Information:
International Journal of Hydrogen Energy, Vol. 45, Issue 58; ISSN 0360-3199
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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