Degradation mechanism of PEMFCs with metallic bipolar plates during 1.4-V pulse cycling

Title
Degradation mechanism of PEMFCs with metallic bipolar plates during 1.4-V pulse cycling
Authors
엄광섭조은애임태훈장종현김형준
Keywords
PEMFC; 1.4 V pulse cycling; degradation; metallic biploar plates
Issue Date
2012-05
Publisher
221st ECS Meeing
Abstract
The degradation of automotive PEMFCs employing bare 316L and MN-coated 316L BPs in comparison with graphite BPs was investigated via 1.4-V pulse cycling. Fig.2 shows the effects of 1.4-V pulse cycling on the i-V curves for the single cells employing graphite, bare 316L, and MN-coated 316 L bipolar plates. By being repetitively exposed to 1.4-V, the cell voltage (Fig. 2 (d)) at 160 mA cm-2 decreased at a decay rate of 6.8, 16.8, and 12.0 mV cycle-1 for graphite, bare 316L and MN-coated 316LBPs. respectively. During the 1.4-V pulse cycling, the cathode degradation caused by both carbon corrosion and Pt migration/agglomeration occurred similarly for all of the MEAs using graphite, bare 316L and MN-coated 316LBPs. In contrast, the membrane degradation due to metal ion contamination was observed only in the membranes cycled with metallic BPs and the amount of metal contamination (i.e., Fe) was reduced by coating the bare 316L with metal nitride as shown in Fig. 3. The dissolution of metal ions might reduce the proton conductivity of the membrane and thus contribute to the faster decrease of the performance of cells using metallic BPs.
URI
http://pubs.kist.re.kr/handle/201004/43393
Appears in Collections:
KIST Publication > Conference Paper
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE