Table 3: Catalytic current of oxygen reduction in McIlvaine buffer solution (pH 5.2) recorded at GCE electrodes covered with SWCNTs modified covalently with redox mediator ABTS2− and Nafion layer containing laccase. Scan rate 0.001 V s−1 [81].

GCE-Nafion film modification 𝑗 c a t (mA/cm2)a (at 0.2 V versus SCE) 𝑄 A B T S (mC/cm2a) 𝑗 c a t / Γ A B T S (mA/nmol)

SWCNT with laccase 0 . 1 8 6
SWCNT-ABTS-side with laccase 0 . 1 9 9 6 . 8 6 3 5 . 6
SWCNT-ABTS-end with laccase 0 . 0 6 6 0 . 1 9 9 5 4 . 7
SWCNT-amine-ABTS with laccase 4 2 1 . 5 7 . 0 6 2 1 1 . 5

aAverage of 5 experiments.