European Journal of Scientific Research - EuroJournals
European Journal of Scientific Research - EuroJournals
European Journal of Scientific Research - EuroJournals
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403 R. Y. Tamakloe, K. Singh and Clovis A. Linkous<br />
Figure 6: Voltage–Current characteristic <strong>of</strong> a fuel cell with PtxPt experimental fuel cell, Al/xxx/Al and<br />
Al/xxx/Cu conductors<br />
Voltage / V<br />
1.20<br />
1.00<br />
0.80<br />
0.60<br />
0.40<br />
0.20<br />
PtxPt, Al/xxx/Al, Al/xxx/Cu Characteristics<br />
0.00<br />
0.00 0.20 0.40 0.60 0.80 1.00 1.20<br />
Current / A<br />
PtxPt<br />
Al/xxx/Al FC<br />
Al/xxx/Cu FC<br />
Figure 7: Voltage–Current characteristic <strong>of</strong> a fuel cell with PtxPt experimental fuel cell, Al/xxx/Al and<br />
Al/xxx/Cu conductors<br />
Voltage/V<br />
1.2<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
I-V Characteristics<br />
0<br />
0.00 0.20 0.40 0.60 0.80 1.00 1.20<br />
Current/A<br />
Al/xxx/Cu<br />
Al/xxx/Al<br />
Al/xxx/Ni/Sn<br />
Al/xxx/Steel<br />
PtxPt<br />
4.0. Discussion<br />
The current collectors can impact the current-voltage characteristic in several ways. If they are not<br />
highly electronically conductive, then they can contribute to the Ohmic resistance <strong>of</strong> the cell. Another<br />
issue is mass transport <strong>of</strong> the gaseous reactants, H2 and O2. In this type <strong>of</strong> cell design in particular, if<br />
the current collectors are not porous, they may block or at least restrict the flow <strong>of</strong> reactive gas through<br />
the gas diffusion electrode. This would contribute to the mass transport limiting current <strong>of</strong> the cell. In
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