Electro-reduction of molecular oxygen mediated by a cobalt(II)octaethylporphyrin system onto oxidized glassy carbon/oxidized graphene substrate

Camila Canales, Leyla Gidi, Roxana Arce, Francisco Armijo, María J. Aguirre, Galo Ramírez

Resultado de la investigación: Article

Resumen

The oxygen reduction reaction (ORR) is the most important reaction in life processes and in energy transformation. The following work presents the design of a new electrode which is composed by deposited cobalt octaethylporphyrin onto glassy carbon and graphene, where both carbonaceous materials have been electrochemically oxidized prior to the porphyrin deposition. The novel generated system is stable and has an electrocatalytic effect towards the oxygen reduction reaction, as a result of the significant overpotential shift in comparison to the unmodified electrode and to the electrodes used as target. Kinetic studies corroborate that the system is capable of reducing molecular oxygen via four electrons, with a Tafel slope value of 60 mV per decade. The systems were morphologically characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) Electrochemical impedance spectroscopy studies showed that the electrode previously oxidized and modified with cobalt porphyrin is the system that possesses lower resistance to charge transfer and higher capacitance.

Idioma originalEnglish
Número de artículo629
PublicaciónCatalysts
Volumen8
N.º12
DOI
EstadoPublished - 1 dic 2018

Huella dactilar

Graphite
Molecular oxygen
glassy carbon
Glassy carbon
Cobalt
Graphene
graphene
cobalt
Electrodes
electrodes
Porphyrins
oxygen
Substrates
porphyrins
Oxygen
carbonaceous materials
low resistance
Electrochemical impedance spectroscopy
Charge transfer
Atomic force microscopy

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Citar esto

Canales, Camila ; Gidi, Leyla ; Arce, Roxana ; Armijo, Francisco ; Aguirre, María J. ; Ramírez, Galo. / Electro-reduction of molecular oxygen mediated by a cobalt(II)octaethylporphyrin system onto oxidized glassy carbon/oxidized graphene substrate. En: Catalysts. 2018 ; Vol. 8, N.º 12.
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abstract = "The oxygen reduction reaction (ORR) is the most important reaction in life processes and in energy transformation. The following work presents the design of a new electrode which is composed by deposited cobalt octaethylporphyrin onto glassy carbon and graphene, where both carbonaceous materials have been electrochemically oxidized prior to the porphyrin deposition. The novel generated system is stable and has an electrocatalytic effect towards the oxygen reduction reaction, as a result of the significant overpotential shift in comparison to the unmodified electrode and to the electrodes used as target. Kinetic studies corroborate that the system is capable of reducing molecular oxygen via four electrons, with a Tafel slope value of 60 mV per decade. The systems were morphologically characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) Electrochemical impedance spectroscopy studies showed that the electrode previously oxidized and modified with cobalt porphyrin is the system that possesses lower resistance to charge transfer and higher capacitance.",
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Electro-reduction of molecular oxygen mediated by a cobalt(II)octaethylporphyrin system onto oxidized glassy carbon/oxidized graphene substrate. / Canales, Camila; Gidi, Leyla; Arce, Roxana; Armijo, Francisco; Aguirre, María J.; Ramírez, Galo.

En: Catalysts, Vol. 8, N.º 12, 629, 01.12.2018.

Resultado de la investigación: Article

TY - JOUR

T1 - Electro-reduction of molecular oxygen mediated by a cobalt(II)octaethylporphyrin system onto oxidized glassy carbon/oxidized graphene substrate

AU - Canales, Camila

AU - Gidi, Leyla

AU - Arce, Roxana

AU - Armijo, Francisco

AU - Aguirre, María J.

AU - Ramírez, Galo

PY - 2018/12/1

Y1 - 2018/12/1

N2 - The oxygen reduction reaction (ORR) is the most important reaction in life processes and in energy transformation. The following work presents the design of a new electrode which is composed by deposited cobalt octaethylporphyrin onto glassy carbon and graphene, where both carbonaceous materials have been electrochemically oxidized prior to the porphyrin deposition. The novel generated system is stable and has an electrocatalytic effect towards the oxygen reduction reaction, as a result of the significant overpotential shift in comparison to the unmodified electrode and to the electrodes used as target. Kinetic studies corroborate that the system is capable of reducing molecular oxygen via four electrons, with a Tafel slope value of 60 mV per decade. The systems were morphologically characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) Electrochemical impedance spectroscopy studies showed that the electrode previously oxidized and modified with cobalt porphyrin is the system that possesses lower resistance to charge transfer and higher capacitance.

AB - The oxygen reduction reaction (ORR) is the most important reaction in life processes and in energy transformation. The following work presents the design of a new electrode which is composed by deposited cobalt octaethylporphyrin onto glassy carbon and graphene, where both carbonaceous materials have been electrochemically oxidized prior to the porphyrin deposition. The novel generated system is stable and has an electrocatalytic effect towards the oxygen reduction reaction, as a result of the significant overpotential shift in comparison to the unmodified electrode and to the electrodes used as target. Kinetic studies corroborate that the system is capable of reducing molecular oxygen via four electrons, with a Tafel slope value of 60 mV per decade. The systems were morphologically characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) Electrochemical impedance spectroscopy studies showed that the electrode previously oxidized and modified with cobalt porphyrin is the system that possesses lower resistance to charge transfer and higher capacitance.

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