Journal
CHEMICAL SCIENCE
Volume 6, Issue 9, Pages 5139-5143Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc01473e
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Funding
- Region Rhones-Alpes
- LabEx ARCANE [ANR-11-LABX-0003-01]
- platform Chimie NanoBio ICMG (PCN-ICMG) [FR 2607]
- [ANR-12-JS08-0006-01]
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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 of 0.43 V vs. Ag/AgCl. The performances of these novel surface-confined HRP mimics were compared to those of a MWCNT electrode modified by HRP. Although the enzyme electrode displays a higher electrocatalytic activity towards H2O2 reduction, the (Im)(PP)Fe-III-modified MWCNT electrode exhibits a markedly higher operational stability, retaining 63% of its initial activity after one month.
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