C/CrN multilayer coating for polymer electrolyte membrane fuel cell metallic bipolar plates

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Kai Feng
  • Zhuguo Li
  • Hailin Sun
  • Lei Yu
  • Xun Cai
  • Yixiong Wu

Detail(s)

Original languageEnglish
Pages (from-to)351-358
Journal / PublicationJournal of Power Sources
Volume222
Online published7 Sep 2012
Publication statusPublished - 15 Jan 2013

Abstract

The two most important issues that plague wider use of stainless steel bipolar plates in polymer electrolyte membrane fuel cells (PEMFCs) are insufficient corrosion resistance and surface conductivity. In this study, C/CrN multilayer coatings are deposited on 316L stainless steel samples by close-field unbalanced magnetron sputtering ion plating. SEM shows that the C/CrN coatings are dense, continuous, and composing of carbon granules on the surface. Raman spectroscopy reveals an amorphous structure with a large sp2 constituent. The corrosion resistance and interfacial contact resistance (ICR) are investigated systematically. A superior ICR in the range of 2.6-2.9 mΩ-cm2 at a compaction force of 150 N/cm2 is achieved and it is even better than that of graphite. The deposited film possesses high chemical inertness thereby significantly enhancing the corrosion resistance of the coated SS316L. A thickness of 800 nm is sufficient to protect against corrosion. C/CrN multilayer coatings are beneficial in that it can lead to a faster PVD deposition process and lower material cost, while permitting a superior performance in terms of surface conductivity and corrosion resistance.

Research Area(s)

  • Bipolar plates, Corrosion resistance, Fuel cell, Interfacial contact resistance, Magnetron sputtering, Multilayer

Citation Format(s)

C/CrN multilayer coating for polymer electrolyte membrane fuel cell metallic bipolar plates. / Feng, Kai; Li, Zhuguo; Sun, Hailin; Yu, Lei; Cai, Xun; Wu, Yixiong; Chu, Paul K.

In: Journal of Power Sources, Vol. 222, 15.01.2013, p. 351-358.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review