고분자 전해질 연료전지 금속 분리판 적용을 위한 탄소 박막의 증착과 내식성 평가

Abstract

Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea(Received June 16, 2015 ; revised June 23, 2015 ; accepted June 24, 2015)AbstractCarbon thin films were deposited on STS 316L sheets by inductively coupled plasma enhanced magnetronsputtering with or without substrate bias voltage. Typical Raman spectrum for amorphous diamond-like carbon(DLC) was obtained, and the interfacial contact resistance (ICR) was measured to show its conductive nature.The electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion mechanism of thecarbon coating under the polymer electrolyte membrane fuel cell (PEMFC) condition. According to the pore-corrosion mechanism, the electrolyte penetrates the carbon coating through the pores and reacts with thesubstrate. As the substrate corrosion proceeds, the pore enlargement occurs and the surface area of the substrateexposed to the electrolyte. Applicability of the carbon coating for the PEMFC bipolar plate was evaluatedby potentiodynamic polarization experiments. Finally, an adhesion problem was briefly considered.