Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.matchemphys.2009.06.008
Title: Electrochemical behavior of two and one electron redox systems adsorbed on to micro- and mesoporous silicate materials: Influence of the channels and the cationic environment of the host materials
Authors: Kumar, K Senthil
Natarajan, P 
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
Phenosafranine
Modified electrode
MCM-41
Zeolite-Y
ZSM-5
CYCLIC VOLTAMMETRY
METHYLENE-BLUE
ZEOLITE
PHENOSAFRANINE
PHOTOCHEMISTRY
FILMS
Issue Date: 15-Oct-2009
Publisher: ELSEVIER SCIENCE SA
Citation: Kumar, K Senthil, Natarajan, P (2009-10-15). Electrochemical behavior of two and one electron redox systems adsorbed on to micro- and mesoporous silicate materials: Influence of the channels and the cationic environment of the host materials. MATERIALS CHEMISTRY AND PHYSICS 117 (2-3) : 365-372. ScholarBank@NUS Repository. https://doi.org/10.1016/j.matchemphys.2009.06.008
Abstract: Electrochemical behavior of two electron redox system, phenosafranine (PS+) adsorbed on to micro- and mesoporous materials is investigated by cyclic voltammetry and differential pulse voltammetry using modified micro- and mesoporous host electrodes. Two redox peaks were observed when phenosafranine is adsorbed on the surface of microporous materials zeolite-Y and ZSM-5. However, only a single redox peak was observed in the modified electrode with phenosafranine encapsulated into the mesoporous material MCM-41 and when adsorbed on the external surface of silica. The observed redox peaks for the modified electrodes with zeolite-Y and ZSM-5 host are suggested to be primarily due to consecutive two electron processes. The peak separation ΔE and peak potential of phenosafranine adsorbed on zeolite-Y and ZSM-5 were found to be influenced by the pH of the electrolyte solution. The variation of the peak current in the cyclic voltammogram and differential pulse voltammetry with scan rate shows that electrodic processes are controlled by the nature of the surface of the host material. The heterogeneous electron transfer rate constants for phenosafranine adsorbed on to micro- and mesoporous materials were calculated using the Laviron model. Higher rate constant observed for the dye encapsulated into the MCM-41 indicates that the one-dimensional channel of the mesoporous material provides a more facile micro-environment for phenosafranine for the electron transfer reaction as compared to the microporous silicate materials. The stability of the modified electrode surface was investigated by multisweep cyclic voltammetry. © 2009 Elsevier B.V. All rights reserved.
Source Title: MATERIALS CHEMISTRY AND PHYSICS
URI: https://scholarbank.nus.edu.sg/handle/10635/200710
ISSN: 02540584
18793312
DOI: 10.1016/j.matchemphys.2009.06.008
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