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Korean Chemical Engineering Research,
Vol.48, No.3, 311-315, 2010
Vol.48, No.3, 311-315, 2010
공기 중 SO2에 의한 고분자전해질 연료전지의 성능 감소
Decrease of PEMFC Performance by SO2 in Air
공기 오염에 의해 SO2가 포함된 공기가 PEMFC cathode에 유입되어 전극 성능에 미치는 영향에 대해 연구하였다. 오염된 공기 접촉 후 저하된 성능회복을 위해 청정공기 유입, 순환전압측정법(cycle voltammetry, CV), 고전압 체류법(high voltage holding)을 사용하였다. 공기에 혼합된 SO2농도 범위는 20 ppb~1.3 ppm이었다. 성능 감소 및 회복 측정은 일정전류에서 전압변화를 측정하는 방법, I-V 분극곡선 측정법, 임피던스측정법을 이용하였다. 20 ppb 농도로 SO2를 200시간 주입 후 전지 전압은 주입 전보다 17 mV 감소하였다. 청정공기 주입, CV, 고전압체류방법에 의해 S가 Pt로부터 탈착되어 전지성능은 일부 회복되었다.
The effects of SO2 on the performance of proton exchange membrane(PEMFC) were investigated by introduction air containing SO2 into cathode inlet of PEMFC. And the recovery of the cell performance by applying clean air, cycle voltammetry(CV) and high voltage holding following exposure contaminated air was studied. The SO2 concentration range used in the experiments was from 20 ppb to 1.3 ppm. The performance degradation and recovery were measured by constant-current discharging, I-V polarization and electrochemical impedance spectroscopy(EIS). The cell voltage gradually decayed with time and decreased by 17 mV after 200 hours of 20 ppb SO2 injection. The cell performance can be recovered partially by clean air flushing, CV and high voltage holding due to desorption of S from Pt catalyst.
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