Figure 4.

A) Plot of the CO₂RR activity loss towards incubation (5 min) of imidazole with AcPyTACN‐modified MWCNT electrodes with (▪) Rec‐RrCODH^His and (•) Rec‐RrCODH (under CO₂, 50 mM Tris‐HCl, pH 8.5, v=5 mV s⁻¹) and corresponding simulated curves using a Langmuir–Freundlich isotherm model (gray line, see Supporting Information for details). B) Chronoamerometry performed at E _p=−0.31 V and −0.76 V vs. NHE (right Y axis) in CO‐saturated pH 8.5 phosphate buffer for His‐tagged Rec‐RrCODH immobilized at a) AcPyTACN‐modified MWCNT electrode and b) nonmodified electrode after increasing time exposure to air and reactivation at E _p=−0.76 V for 100 seconds. C) Plot of the residual CO oxidation activity towards increasing time exposure to air for a) Rec‐RrCODH^His in solution, b) Rec‐RrCODH^His immobilized at non modified MWCNT electrode and c) Rec‐RrCODH^His immobilized at AcPyTACN‐modified MWCNT electrode