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Reuillard, Bertrand; Ly, Khoa H; Hildebrandt, Peter; Jeuken, Lars J. C; Butt, Julea N; Reisner, Erwin
Journal of the American Chemical Society, 03/2017, Letnik: 139, Številka: 9Journal Article
The decaheme cytochrome MtrC from Shewanella oneidensis MR-1 immobilized on an ITO electrode displays unprecedented H2O2 reduction activity. Although MtrC showed lower peroxidase activity in solution compared to horseradish peroxidase, the ten heme cofactors enable excellent electronic communication and a superior activity on the electrode surface. A hierarchical ITO electrode enabled optimal immobilization of MtrC and a high current density of 1 mA cm–2 at 0.4 V vs SHE could be obtained at pH 6.5 (E onset = 0.72 V). UV–visible and Resonance Raman spectroelectrochemical studies suggest the formation of a high valent iron-oxo species as the catalytic intermediate. Our findings demonstrate the potential of multiheme cytochromes to catalyze technologically relevant reactions and establish MtrC as a new benchmark in biotechnological H2O2 reduction with scope for applications in fuel cells and biosensors.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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