Investigations of the Effect of chlorides on PEM Fuel Cells Performances

• Main Authors: You-Lun Liu, 劉又綸
• Other Authors: Hsin-Sen Chu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/6kf254

碩士 === 國立交通大學 === 機械工程系所 === 92 === This study presents an investigation of the proton exchange membrane fuel cell performances with the presence of chlorides in the cathode gas. Moisturized by the ultrasonic vibrator, the sodium chloride and calcium chloride were fed into the supply oxidant gas at different elevated concentrations. The results of five-hours testing show that the exist of sodium chloride in the cathode gas has no sensible influence on the cell performance for the set operation currents, while in the case of calcium chloride, the decay of output voltage increases with increasing operating current density. The degradation rate of the cell voltage is -1.082 mV h-1 and -3.446 mV h-1 for 108 hours operation of cell with sodium chloride and calcium chloride in the cathode gas respectively at the current density of 1A/cm2. The polarization curves indicate that the mechanisms of the performance decay are mainly due to the ohmic and mass transport overpotentials that arise from the increasing of cell resistance and the hindrance of the passage for the reaction species by the existence of chlorides in the cathode gas.