Nafion/tetraruthenated porphyrin glassy carbon-modified electrode: characterization and voltammetric studies of sulfite oxidation in water–ethanol solutions |
| |
Authors: | Karla Calfumán María Jesus Aguirre Diego Villagra Claudia Yañez Carmen Arévalo Betty Matsuhiro Leonora Mendoza Mauricio Isaacs |
| |
Institution: | 1. Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras #3425, Casilla 653, ?u?oa, Santiago, Chile 2. Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40-Correo 33, Santiago, Chile 3. Departamento de Química, Facultad de Ciencias, Universidad de Tarapacá, Arica, Av. General Velásquez 1775, Casilla 7-D, Arica, Chile 4. Departamento de Química Orgánica y Físico-Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, P.O. Box?233, Santiago, Chile 5. Departamento de Química Física, Facultad de Química, Universidad de La Laguna, 38071-La Laguna, Santa Cruz de Tenerife, Spain
|
| |
Abstract: | In this work, the modification of a glassy carbon electrode with tetraruthenated porphyrins electrostatically assembled onto
a Nafion film, previously adsorbed on the electrode surface, is reported. This modified electrode was characterized by scanning
electron microscopy–energy-dispersive X-ray, Raman spectroscopy, UV-Vis spectroelectrochemistry, and cyclic voltammetry. The
Nafion film onto the glassy carbon electrode shows a smooth disposition; when the tetraruthenated porphyrin is incorporated
on the Nafion film, the complex is adsorbed in a homogeneous way. The modified electrode catalyzes HSO3− oxidation in water–ethanol solutions and shows an enhanced stability compared with the electrode modified with the dip coating
method. Rotating disk electrode experiments showed a kinetic limitation to the electron transfer controlled by charge propagation
in the film. I/E curves show a Tafel slope of 120 mV/decade corresponding to a first electron-transfer reaction, depending on the potential,
as the determining step. Spectroelectrochemical experiments demonstrated that Ru(II) is the active site for the electrocatalysis. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|