Figure 17: Current density-cathode potential plots for the electrodes with laccase adsorbed on the following materials: graphite felt (a), porous carbon tubes (b), single-walled carbon nanotubes (c), multiwalled carbon nanotubes (d), and carbon nanofibers (e). (A) Comparison of cathode performance with a current density normalized to volume. (B) Comparison of cathode performance with a current density normalized to BET surface area. Reproduced with permission (from [18]).