Effect of deposition temperature on the formation of the corrosion-protective SnOx:F coating layer on SUS 316 bipolar plates for PEMFC

Ji Hun Park, Wonyoung Chang, Dongjin Byun, Joong Kee Lee

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Fluorine-doped tin oxide (SnOx:F) films on SUS 316 were prepared as a function of substrate temperature using electron cyclotron resonance-metal organic chemical vapor deposition (ECR-MOCVD) in order to achieve corrosion-resistant and low contact resistance bipolar plates for polymer electrolyte membrane fuel cells (PEMFCs). The SnOx:F films coated on SUS 316 substrate in the heating range from 200 to 500 °C were characterized by x-ray diffraction (XRD), Auger electron microscopy (AES) and field emission-scanning electron microscopy (FE-SEM). To simulate the aggressive PEMFC environment, all electrochemical experiments were conducted in 1 M H 2SO4+2 ppm HF solution at 70 °C. With increases in the heat treatment temperature from 300 to 500 °C, it was shown that both corrosion resistance and interfacial contact resistance (ICR) substantially increase. The AES data revealed that the amount of fluorine decreases with increasing temperature in our experimental range. The deposition temperature appears to be one of the critical process parameters on the formation of the corrosion-protective layer for PEMFC bipolar plates. It is probably caused by microstructural evolution before/after potentiodynamic corrosion tests under the PEMFC environment.

Original languageEnglish
Article number014020
JournalPhysica Scripta
VolumeT139
DOIs
Publication statusPublished - 2010
Event3rd International Symposium on Functional Materials 2009, ISFM 2009 - Jinju, Korea, Republic of
Duration: 2009 Jun 152009 Jun 18

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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