수송용 연료전지 스택의 탄소 계열 분리판 표면에 형성된 바나듐 산화물 다층 박막의 온도-저항 특성에 관한 연구

Abstract

The present experimental study was carried out to examine the applicability of crystalline vanadium oxide thin films as a potential electrical heat source. The thin solid films were formed uniformly along the edges of carbon-based separators to enhance cold-start performance of fuel cells for transportation applications. The multi-layered crystalline vanadium oxide films were synthesized by using 0.5M vanadium alkoxide precursor and then deposited onto porous graphite plates with a gas-impermeable resin through dip-coating technique and a subsequent post-heat treatment under vacuum conditions. The temperature-resistance properties, the quantitative analysis of the elemental composition, and the microstructure of the vanadium oxide films were investigated using 4-point probe, EDX, and FE-SEM, respectively. In this study, the temperature dependent electrical properties of the sol-gel derived vanadium-based films onto graphite plates were characterized by a Boltzmann sigmoidal regression in the temperature range of -20 ?? 80℃. Also, the theoretical discussion of the surface morphology with pore-induced shrinkage cracking in the films was presented.