2.4. Electrochemical measurements
Cyclic voltammetry (PC 4/750 potentiostat, Gamry) was
carried out to characterize the ethanol oxidation reaction of
the anode bioWlm. A conventional three-electrode system
was employed with the anode as the working electrode, the
cathode (22.5cm2
, 0.35 mg/cm2
; 10% Pt; E-Tek, NJ) as the
counter electrode, and an Ag/AgCl reference electrode. The
potentials were shifted from ¡800 to 200 mV at a scan rate of
20 mV/s while monitoring the current response. Peaks were
obtained in the range of ¡600 to 0 mV (Liu et al., 2005b).