A Pyrene‐Triazacyclononane Anchor Affords High Operational Stability for CO₂RR by a CNT‐Supported Histidine‐Tagged CODH

Abstract

An original 1-acetato-4-(1-pyrenyl)-1,4,7-triazacyclononane (AcPyTACN) was synthesized for the immobilization of a His-tagged recombinant CODH from Rhodospirillum rubrum (RrCODH) on carbon-nanotube electrodes. The strong binding of the enzyme at the Ni-AcPyTACN complex affords a high current density of 4.9 mA cm^-2 towards electroenzymatic CO₂ reduction and a high stability of more than 6×10⁶ TON when integrated on a gas-diffusion bioelectrode.