Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes
The biocatalytic electroreduction of oxygen has been studied on large surface area graphite and Vulcan® carbon electrodes with adsorbed Trametes trogii laccase. The electrokinetics of the O2 reduction reaction (ORR) was studied at different electrode potentials, O2 partial pressures and concentratio...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15675394_v109_n_p101_Adam http://hdl.handle.net/20.500.12110/paper_15675394_v109_n_p101_Adam |
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paper:paper_15675394_v109_n_p101_Adam2023-06-08T16:24:05Z Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes Scodeller, Pablo David Villalba, Matias Ariel Calvo, Ernesto Julio Catalysis Inhibition Laccase Nanostructured carbon Oxygen reduction reaction (ORR) Catalysis Electrodes Electrohydrodynamics Electrolytic reduction Electromagnetic fields Electron transitions Enzyme electrodes Enzymes Graphite electrodes Oxygen Peroxides Direct electron transfer Electroreduction of oxygens Inhibition mechanisms Inhibitor concentration Laccases Nanostructured carbons Oxygen reduction reaction Rate determining step Enzyme inhibition carbon graphite hydrogen peroxide laccase nanomaterial oxygen carbon immobilized enzyme laccase nanomaterial oxygen Article biocatalysis chemical reaction current density electrical parameters electrochemistry electron transport electroreduction enzyme mechanism inhibition kinetics nonhuman oxygen electrode oxygen reduction reaction oxygen tension surface area Trametes Trametes trogii bioenergy chemistry electrode enzymology metabolism microbiology oxidation reduction reaction Bioelectric Energy Sources Carbon Electrodes Enzymes, Immobilized Graphite Laccase Nanostructures Oxidation-Reduction Oxygen Trametes The biocatalytic electroreduction of oxygen has been studied on large surface area graphite and Vulcan® carbon electrodes with adsorbed Trametes trogii laccase. The electrokinetics of the O2 reduction reaction (ORR) was studied at different electrode potentials, O2 partial pressures and concentrations of hydrogen peroxide.Even though the overpotential at 0.25 mA·cm-2 for the ORR at T1Cu of the adsorbed laccase on carbon is 0.8 V lower than for Pt of similar geometric area, the rate of the reaction and thus the operative current density is limited by the enzyme reaction rate at the T2/T3 cluster site for the adsorbed enzyme. The transition potential for the rate determining step from the direct electron transfer (DET) to the enzyme reaction shifts to higher potentials at higher oxygen partial pressure.Hydrogen peroxide produced by the ORR on bare carbon support participates in an inhibition mechanism, with uncompetitive predominance at high H2O2 concentration, non-competitive contribution can be detected at low inhibitor concentration. © 2016 Elsevier B.V. Fil:Scodeller, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Villalba, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15675394_v109_n_p101_Adam http://hdl.handle.net/20.500.12110/paper_15675394_v109_n_p101_Adam |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Catalysis Inhibition Laccase Nanostructured carbon Oxygen reduction reaction (ORR) Catalysis Electrodes Electrohydrodynamics Electrolytic reduction Electromagnetic fields Electron transitions Enzyme electrodes Enzymes Graphite electrodes Oxygen Peroxides Direct electron transfer Electroreduction of oxygens Inhibition mechanisms Inhibitor concentration Laccases Nanostructured carbons Oxygen reduction reaction Rate determining step Enzyme inhibition carbon graphite hydrogen peroxide laccase nanomaterial oxygen carbon immobilized enzyme laccase nanomaterial oxygen Article biocatalysis chemical reaction current density electrical parameters electrochemistry electron transport electroreduction enzyme mechanism inhibition kinetics nonhuman oxygen electrode oxygen reduction reaction oxygen tension surface area Trametes Trametes trogii bioenergy chemistry electrode enzymology metabolism microbiology oxidation reduction reaction Bioelectric Energy Sources Carbon Electrodes Enzymes, Immobilized Graphite Laccase Nanostructures Oxidation-Reduction Oxygen Trametes |
| spellingShingle |
Catalysis Inhibition Laccase Nanostructured carbon Oxygen reduction reaction (ORR) Catalysis Electrodes Electrohydrodynamics Electrolytic reduction Electromagnetic fields Electron transitions Enzyme electrodes Enzymes Graphite electrodes Oxygen Peroxides Direct electron transfer Electroreduction of oxygens Inhibition mechanisms Inhibitor concentration Laccases Nanostructured carbons Oxygen reduction reaction Rate determining step Enzyme inhibition carbon graphite hydrogen peroxide laccase nanomaterial oxygen carbon immobilized enzyme laccase nanomaterial oxygen Article biocatalysis chemical reaction current density electrical parameters electrochemistry electron transport electroreduction enzyme mechanism inhibition kinetics nonhuman oxygen electrode oxygen reduction reaction oxygen tension surface area Trametes Trametes trogii bioenergy chemistry electrode enzymology metabolism microbiology oxidation reduction reaction Bioelectric Energy Sources Carbon Electrodes Enzymes, Immobilized Graphite Laccase Nanostructures Oxidation-Reduction Oxygen Trametes Scodeller, Pablo David Villalba, Matias Ariel Calvo, Ernesto Julio Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| topic_facet |
Catalysis Inhibition Laccase Nanostructured carbon Oxygen reduction reaction (ORR) Catalysis Electrodes Electrohydrodynamics Electrolytic reduction Electromagnetic fields Electron transitions Enzyme electrodes Enzymes Graphite electrodes Oxygen Peroxides Direct electron transfer Electroreduction of oxygens Inhibition mechanisms Inhibitor concentration Laccases Nanostructured carbons Oxygen reduction reaction Rate determining step Enzyme inhibition carbon graphite hydrogen peroxide laccase nanomaterial oxygen carbon immobilized enzyme laccase nanomaterial oxygen Article biocatalysis chemical reaction current density electrical parameters electrochemistry electron transport electroreduction enzyme mechanism inhibition kinetics nonhuman oxygen electrode oxygen reduction reaction oxygen tension surface area Trametes Trametes trogii bioenergy chemistry electrode enzymology metabolism microbiology oxidation reduction reaction Bioelectric Energy Sources Carbon Electrodes Enzymes, Immobilized Graphite Laccase Nanostructures Oxidation-Reduction Oxygen Trametes |
| description |
The biocatalytic electroreduction of oxygen has been studied on large surface area graphite and Vulcan® carbon electrodes with adsorbed Trametes trogii laccase. The electrokinetics of the O2 reduction reaction (ORR) was studied at different electrode potentials, O2 partial pressures and concentrations of hydrogen peroxide.Even though the overpotential at 0.25 mA·cm-2 for the ORR at T1Cu of the adsorbed laccase on carbon is 0.8 V lower than for Pt of similar geometric area, the rate of the reaction and thus the operative current density is limited by the enzyme reaction rate at the T2/T3 cluster site for the adsorbed enzyme. The transition potential for the rate determining step from the direct electron transfer (DET) to the enzyme reaction shifts to higher potentials at higher oxygen partial pressure.Hydrogen peroxide produced by the ORR on bare carbon support participates in an inhibition mechanism, with uncompetitive predominance at high H2O2 concentration, non-competitive contribution can be detected at low inhibitor concentration. © 2016 Elsevier B.V. |
| author |
Scodeller, Pablo David Villalba, Matias Ariel Calvo, Ernesto Julio |
| author_facet |
Scodeller, Pablo David Villalba, Matias Ariel Calvo, Ernesto Julio |
| author_sort |
Scodeller, Pablo David |
| title |
Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| title_short |
Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| title_full |
Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| title_fullStr |
Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| title_full_unstemmed |
Revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| title_sort |
revisiting direct electron transfer in nanostructured carbon laccase oxygen cathodes |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15675394_v109_n_p101_Adam http://hdl.handle.net/20.500.12110/paper_15675394_v109_n_p101_Adam |
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AT scodellerpablodavid revisitingdirectelectrontransferinnanostructuredcarbonlaccaseoxygencathodes AT villalbamatiasariel revisitingdirectelectrontransferinnanostructuredcarbonlaccaseoxygencathodes AT calvoernestojulio revisitingdirectelectrontransferinnanostructuredcarbonlaccaseoxygencathodes |
| _version_ |
1768545345634041856 |