A Study on Cathode Degradation of PEMFCs under On/off Cycling Operation
- A Study on Cathode Degradation of PEMFCs under On/off Cycling Operation
- 김재홍; 조은애; 장종현; 김형준; 임태훈; 오인환
- PEMFC; Durability
- Issue Date
- Meeting of the Electrochemical Society
- To elucidate the mechanism, EPMA, WDS, BSEM, on-line CO2 analysis, XPS, TOF-SIMS, ICP, XRD, FETEM, SAED, EDX and FTIR were carried out before and after the durability test. The results revealed that pronounced Pt coarsening (agglomeration)/ oxidation/dissolution (detachment) and migration occurred along with corrosion of the carbon support at the majority of cathode catalyst layers. These changes contributed to the significant loss of Pt mass available for electrochemical reactions and active Pt surface area at the cathode, thus decaying the performance of the fuel cell. In addition, the rate of these multiple processes was RH-dependent. However, the degradation at the anode and membrane was not as severe as those observed at the cathode and did not show any dependence on cathode inlet RH. Based on these results, a modified mechanism for the degradation of the cathode catalyst layer during the startup-shutdown cycling of PEMFCs is proposed to explore the effects of RH on fuel cell performance and durability
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