scholarly journals Sampled current voltammetry for kinetic studies on materials unsuitable for rotating discs or microelectrodes: Application to the oxygen reduction reaction in acidic medium

2020 ◽  
Vol 362 ◽  
pp. 136946
Author(s):  
Cybelle Oliveira Soares ◽  
Oliver Rodríguez ◽  
Gaëtan Buvat ◽  
Matteo Duca ◽  
Sébastien Garbarino ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acidic Medium ◽  
Kinetic Studies ◽  
Reduction Reaction ◽  
Rotating Discs

Carbon-supported Pt-free catalysts with high specificity and activity toward the oxygen reduction reaction in acidic medium

2016 ◽  
Vol 184 ◽  
pp. 12-19 ◽  
Author(s):  
Luis Miguel Rivera Gavidia ◽  
Gonzalo García ◽  
Dalila Anaya ◽  
Amaia Querejeta ◽  
Francisco Alcaide ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acidic Medium ◽  
High Specificity ◽  
Reduction Reaction

scholarly journals Electro-Reduction of Molecular Oxygen Mediated by a Cobalt(II)octaethylporphyrin System onto Oxidized Glassy Carbon/Oxidized Graphene Substrate

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 629 ◽  
Author(s):  
Camila Canales ◽  
Leyla Gidi ◽  
Roxana Arce ◽  
Francisco Armijo ◽  
María Aguirre ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Molecular Oxygen ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Kinetic Studies ◽  
Reduction Reaction ◽  
Force Microscopy ◽  
Electrocatalytic Effect ◽  
Spectroscopy Studies

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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