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<p>Transition metal nitride coatings are widely used for the protection of metallic bipolar plates in proton exchange membrane fuel cells (PEMFCs). However, various defects in single-component coatings prepared by PVD impact their corrosion resistance. Hence, this work proposes doping niobium into the TiN coating to reduce the defect density of the coating and form a Nb-doped TiO<sub>2</sub> layer with excellent electrical conductivity on the surface in service. This work studies the influence of pulse bias duty cycle on the microstructure, corrosion resistance, and interfacial contact resistance of TiNbN coatings. Results show that the coating at a duty cycle of 50% exhibits the lowest corrosion current density. The ICR of the coatings meets the DOE 2025 requirement. Furthermore, the corrosion mechanism of TiNbN coatings is discussed. This work provides a new route for the composition design of coatings for PEMFCs metallic bipolar plates and gains new opportunities for the application in PEMFCs field.</p>

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Influence of Pulsed-Substrate Bias Duty Cycle on Microstructure and Properties of Nb-doped TiN Coatings on PEMFC Bipolar Plates

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Yanli Wang,
  • Sen Li,
  • Jie Wang,
  • Lingxu Yang,
  • Huijun Liu,
  • Chaoliu Zeng

摘要

Transition metal nitride coatings are widely used for the protection of metallic bipolar plates in proton exchange membrane fuel cells (PEMFCs). However, various defects in single-component coatings prepared by PVD impact their corrosion resistance. Hence, this work proposes doping niobium into the TiN coating to reduce the defect density of the coating and form a Nb-doped TiO2 layer with excellent electrical conductivity on the surface in service. This work studies the influence of pulse bias duty cycle on the microstructure, corrosion resistance, and interfacial contact resistance of TiNbN coatings. Results show that the coating at a duty cycle of 50% exhibits the lowest corrosion current density. The ICR of the coatings meets the DOE 2025 requirement. Furthermore, the corrosion mechanism of TiNbN coatings is discussed. This work provides a new route for the composition design of coatings for PEMFCs metallic bipolar plates and gains new opportunities for the application in PEMFCs field.