Biomimetic versus enzymatic high-potential electrocatalytic reduction of hydrogen peroxide on a functionalized carbon nanotube electrode.

ABSTRACT: We report the non-covalent functionalization of a multi-walled carbon nanotube (MWCNT) electrode with a biomimetic model of the horseradish peroxidase (HRP) active site. By modifying the MWCNT electrode surface with imidazole-modified polypyrrole, a new biomimetic complex of HRP was synthesized on the MWCNT sidewalls via the coordination of imidazole (Im) to the metal centre of iron protoporphyrin IX, affording (Im)(PP)Fe^III . Compared to the pi-stacking of non-coordinated (PP)Fe^III on a MWCNT electrode, the (Im)(PP)Fe^III -modified MWCNT electrode exhibits higher electrocatalytic activity with an I_max = 0.52 mA cm^-2 for the reduction of H₂O₂, accompanied by a high onset potential

SUBMITTER: Reuillard B 

PROVIDER: S-EPMC5666682 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature