Degradation mechanism of automotive PEMFCs: Effects of Pt loading in the electrodes on the durability of a MEA for PEMFCs during startup/shutdown cycling
- Degradation mechanism of automotive PEMFCs: Effects of Pt loading in the electrodes on the durability of a MEA for PEMFCs during startup/shutdown cycling
- 엄광섭; 김경희; 김민중; 조은애; 임태훈; 장종현
- PEMFC; Degradation; Anode Pt loading; on/off cycling; polymer electrolyte membrane fuel cell; membrane electrode assembly; durability; reverse current condition; startup and shutdown cycling; anode platinum loading
- Issue Date
- A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by the oxygen reduction reaction (ORR) induced at the anode with a hydrogen/air boundary during startup/shutdown processes. With an increase in the reverse current, the degradation rate of the cathode that experiences a highly corrosive condition (locally high potential) increases. In this work, the anode Pt loading is decreased from 0.4 to 0.1 mg cm-2 to decrease the reverse current. The decrease in the anode Pt loading is found to decrease the hydrogen oxidation rates (HOR) during normal operation, but this loading decrease barely affected the cell performance. However, a decrease in the anode Pt loading can significantly decrease the reverse current, leading to a diminished cathode degradation rate during startup/shutdown cycling. It is revealed by slow decreases in the cell performance (i-V curves) and electrochemical active surface area (EAS), and a slow increase in the charge-transfer resistance (Rct), which can be attributed to corrosion of the carbon support and dissolution/migration/agglomeration of the platinum catalyst.
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