Table 4: Background and dioxygen reduction current densities ( 𝑗 b c g and 𝑗 c a t ) recorded at GC electrodes covered with Nafion films containing SWCNTs covalently modified with different functional groups. Scan rate 0.001 V/s, McIlvaine buffer solution, pH 5.2/0.2 NaNO3 (from [32]).

GCE modification 𝑗 b c g (mA/cm2) 𝑗 c a t (mA/cm2) 𝑗 c a t 𝑗 b c g (mA/cm2)

SWCNT/laccase + Nafion 0 . 0 6 5 ± 0 . 0 1 1 0 . 1 8 7 ± 0 . 0 1 8 0 . 1 2 1 ± 0 . 0 2 6
SWCNT-amine-ABTS-side/laccase + Nafion 0 . 0 3 8 ± 0 . 0 0 5 0 . 4 2 1 ± 0 . 0 0 7 0 . 3 8 0 ± 0 . 0 1 2
SWCNT-AQ-end/SWCNT-AQ-end + laccase + Nafion 0 . 0 6 7 ± 0 . 0 0 4 0 . 2 4 6 ± 0 . 0 0 2 0 . 1 7 8 ± 0 . 0 0 6
SWCNT-anthracene side/laccase + Nafion 0 . 0 2 2 ± 0 . 0 0 5 0 . 2 3 8 ± 0 . 0 3 2 0 . 2 1 5 ± 0 . 0 3 3
SWCNT-naphthalene side/laccase + Nafion 0 . 0 1 4 ± 0 . 0 0 6 0 . 2 3 0 ± 0 . 0 0 6 0 . 2 1 1 ± 0 . 0 1 2
SWCNT-terphenyl side/laccase + Nafion 0 . 0 7 1 ± 0 . 0 0 5 0 . 4 2 4 ± 0 . 0 0 6 0 . 3 5 4 ± 0 . 0 0 6