DMFC Performance and Cr(VI) Concentration Tracking During Successive Operation (IMAGE)
Caption
The effect of Cr (VI) addition on DMFC performance was also investigated in more detail by employing chronopotentiometry. In the absence of chromium, the potential decreased gradually, mainly because of CO poisoning. However, when Cr (VI) was added, the potential maintained a nearly constant value up to 10 h because of inhibited CO poisoning (Figure a). After 10 h reaction of DMFC, 250 μM of Cr (VI) was almost completely removed with exhibiting first order kinetics (kobs = 0.004 min-1) (Figure b). It should be noted that the cell voltage started to decrease after 7 h when the concentration of Cr(VI) fell below 50 μM, which suggests the re-accumulation of CO on the Pt surface as Cr(VI) concentration is depleted.
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IBS Center for Nanoparticle Research
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