Enhanced Hydrogen Peroxide Sensing Based on Tetraruthenated Porphyrins/Nafion/Glassy Carbon‐modified Electrodes via Incorporating of Carbon Nanotubes |
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| Authors: | Karla Calfumán Diego Quezada Mauricio Isaacs Soledad Bollo |
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| Affiliation: | 1. Facultad de Ciencias, Departamento de Química, Universidad de Chile, Las Palmeras #3425, Casilla 653, ?u?oa, Santiago, Chile;2. Facultad de Química, Departamento de Química, Inorgánica, Pontificia, Universidad de Católica Chile, Santiago, Chile;3. Facultad de Ciencias Químicas y Farmacéuticas, Departamento de Química Farmacológica y Toxicológica, Universidad de Chile, Santiago, Chile |
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| Abstract: | The incorporation of carbon nanotubes to a Nafion/tetraruthenated cobalt porphyrin/ glassy carbon electrode (GC/Nf/CoTRP vs GC/Nf/CNTCoTRP) enhanced the amperometric determination of hydrogen peroxide. Both electrodes produced a decrease in the overpotential required for the hydrogen peroxide oxidation in about 100 mV compared to glassy carbon under the same experimental conditions. Nevertheless, for GC/Nf/CNT/CoTRP, the increase in the current is remarkable. The GC/Nf/CoTRP modified electrode gave no significant analitycal signal for hydrogen peroxide reduction. Moreover, a great increase in current is observed with GC/Nf/CNT/CoTRP at ?150mV which suggests a significant increase in the sensitivity of the modified electrode. Scanning electrochemical microscopy (SECM) revealed an enhancement in the electroactivity of the GC/Nf/CNT/CoTRP modified electrode. This fact has been explained in terms of enhanced homogeneity of the electrodic surface as a consecuence of better dispersibility of CNT‐CoTRP produced by a Nafion polyelectrolyte. |
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| Keywords: | Tetraruthenated porphyrins Modified electrodes Electrocatalysis Nafion Hydrogen peroxide Carbon nanotubes |
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