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Electrochemical behavior of CrN coating for polymer electrolyte membrane fuel cell

journal contribution
posted on 2010-01-01, 00:00 authored by N Nam, I Park, J Kim, P Tai, D Yoon
CrN films on a bipolar plate in polymer electrolyte membrane fuel cells have several advantages owing to their excellent corrosion resistance and mechanical properties. Three CrN samples deposited at various radio frequency (RF) powers by RF magnetron sputtering were evaluated under potentiodynamic, potentiostatic and electrochemical impedance spectroscopy conditions. The electrochemical impedance spectroscopy data were monitored for 168 h in a corrosive environment at 70 °C to determine the coating performance at +600 mVSCE under simulated cathodic conditions in a polymer electrolyte membrane fuel cell. The electrochemical behavior of the coatings increased with decreasing RF power. CrN films on the AISI 316 stainless steel substrate showed high protective efficiency and charge transfer resistance, i.e. increasing corrosion resistance with decreasing RF power. X-ray diffraction confirmed the formation of a CrN(200) preferred orientation at low RF power.

History

Journal

Physica scripta T

Volume

T139

Pagination

014016 - 14016

Publisher

Institute of Physics Publishing

Location

Bristol, England

ISSN

0031-8949

eISSN

1402-4896

Language

eng

Notes

This paper was presented at the ISFM 2009 : 3rd International Symposium on Functional Materials

Publication classification

C1.1 Refereed article in a scholarly journal