378752.fig.007a
(a)
378752.fig.007b
(b)
378752.fig.007c
(c)
Figure 7: (a) The parallel resistance ( ), (b) the series resistance ( ), and (c) the maximum power of fuel cells assembled with bare stainless steel (SS) bipolar plates and those coated with the CNT/PTFE composite film at various CNT concentrations.