Degradation mechanism of PEMFCs with metallic bipolar plates during 1.4-V pulse cycling
- Degradation mechanism of PEMFCs with metallic bipolar plates during 1.4-V pulse cycling
- 엄광섭; 조은애; 임태훈; 장종현; 김형준
- PEMFC; 1.4 V pulse cycling; degradation; metallic biploar plates
- Issue Date
- 221st ECS Meeing
- 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.
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