Effects of Cathode Inlet Relative Humidity on PEMFC Durability during Startup-Shutdown Cycling: II. Diagnostic Study
- Effects of Cathode Inlet Relative Humidity on PEMFC Durability during Startup-Shutdown Cycling: II. Diagnostic Study
- 김재홍; 조유연; 조은애; 장종현; 김형준; 임태훈; 오인환; 고재준; Son Ik Jae
- PEMFC; Durability; MEA; RH
- Issue Date
- Journal of the Electrochemical Society
- VOL 157, NO 5, B633-B642
- This paper uses a variety of physicochemical methods to elucidate the mechanism by which cathode inlet relative humidity (RH)
degrades a proton exchange membrane fuel cell (PEMFC) during startup–shutdown cycling. The results revealed that the pronounced
Pt coarsening (agglomeration)/oxidation/dissolution (detachment)) and migration were observed along with corrosion of
the carbon support at the majority of cathode catalyst layers when PEMFCs were exposed to a higher cathode inlet RH during
1500 startup–shutdown cycles. These changes contributed to the significant loss of Pt mass available for electrochemical reactions
and an 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 the cathode inlet RH. Based on these results, a modified mechanism for the
degradation of the cathode catalyst layer during startup–shutdown cycling of PEMFCs is proposed to explain the effects of RH on
fuel cell performance and durability.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.