고분자전해질연료전지의 냉각수 누설에 대한 연구

Abstract

The performance of polymer electrolyte membrane fuel cel could be decreased due to coolant leaked fromconnection part. Micro pump was used to put small amount of coolant and investigate the effect on fuel cell. Thestoichiometric ratio of hydrogen/air was 1.5/2.0, both side of gas was fuly humidified, and current density of 400mA/cm2 was used as standard condition in this experiment. Constant current method was used to check performancerecovery from coolant efect in 3 cel stack. The performance was recovered when coolant was injected in cathodeside. On the other hand, the performance was not recovered when coolant was injected in anode side. Ethylene glycolcould be converted to CO in oxidation process and cause poisoning effect on platinum catalyst or be adhered onGDL and cause gas diffusion block effect resulting performance decrease. Water with nitrogen gas was supplied inanode side to check performance recovery. Polarization curve, cyclic voltammetry, electrochemical impedance spec-troscopy was used to check performance, and gas chromatography was used to check coolant concentration. Constantcurrent method was not enough in full recovery of performance. However, water injection method was proved goodmethod in full recovery of performance.