Abstract
The current density of biofuel cells which use dissolved O 2 as electron acceptor is limited by O 2 supply to the electrode surface due to the low solubility and small diffusion coefficient of O 2 in the electrolyte solution. In order to increase the current density, we constructed an air diffusion biocathode which uses O 2 directly from the air. As cathodic biocatalyst, we utilized CueO from Escherichia coli, which belongs to the family of multi-copper oxidases. O 2 reduction was catalyzed by CueO adsorbed on Ketjen black-modified carbon paper electrodes. The hydrophobic electrode surface was obtained by optimizing the weight ratio of polytetrafluoroethylene binder to Ketjen black. The current density of O 2 reduction reached values as high as 20 mA cm − 2 at 0 V vs. Ag|AgCl, KCl(sat.) in a citrate buffer (1.0 M, pH 5.0, 25 °C).
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