Effects of Procedure of Hydrogen and Air Supply on Performance Degradation of PEMFCs
- Effects of Procedure of Hydrogen and Air Supply on Performance Degradation of PEMFCs
- 조유연; 김재홍; 김정현; 조은애; 임태훈; 오인환; 장종현; 김형준
- PEMFC; Durability
- Issue Date
- Asia Hydrogen Energy Conference 2009
- To improve durability of polymer electrolyte membrane fuel cells (PEMFCs) for automobile applications, effects of procedure of hydrogen and air supply during startup process on long-term stability was investigated. To examine the effects of procedure of hydrogen and air supply, polarization curves, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and linear sweep voltammetry (LSV) were measured with repeating startup-shutdown cycles. Compared with concurrent supply of hydrogen and air to a single cell for starting-up, supplying hydrogen prior to air exhibited slower decay in the cell performance and electrochemical active surface area and slower increase in charge transfer resistance during repetitive startup-shutdown cycles. On the other hand, open circuit voltage, ohmic resistance, and hydrogen crossover current density was kept almost constant. These results suggested that supplying hydrogen prior to air could effectively mitigate performance degradation, by retarding degradation of the electrodes rather than the membrane.
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