Influence on the Electroactive Area of the Electrode's Nature and the Transformed Redox Molecule

• Published in: ECS transactions 2018-01, Vol.84 (1), p.235-242
• Main Authors: Franco Guzmán, Miriam, Álvarez-Romero, Giaan Arturo, Mendoza Huizar, Luis Humberto, Galán-Vidal, Carlos Andrés, Roa Morales, Gabriela
• Format: Article
• Language: English
• ISSN: 1938-5862; 1938-6737; 1938-6737; 1938-5862
• DOI: 10.1149/08401.0235ecst

In literature, studying the effect of the working electrode's surface morphology on the electrochemical kinetics for various molecules has increased. An important parameter related to these studies is the electroactive area of ​​the electrode. Generally, a model molecule such as ferro/ferricyanide is used to calculate the electroactive area by cyclic voltammetry at different scan rates and using the Randles-Sevcik equation. However, since the electrochemical phenomena depend on the electrode's nature and the transformed molecule, it is can be assumed that the electroactive area calculated with the ferro/ferricyanide molecule will not be representative when another molecule is transformed or another electrode is used. Therefore, in this work, a comparative study of the electroactive area of ​​five different carbon-based electrodes is performed calculated considering the anodic or cathodic processes of different molecules (diclofenac, ferro/ferricyanide and ascorbic acid), and with the results obtained, establish possible differences and similarities when calculating the electroactive area of each electrode.