A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements

The aim of the present work was study how the charge-transport process of a nickel hydroxide film electrochemically synthesized on a gold substrate is modified when the electrode is stored without use for long time. It was found that nickel hydroxide films deactivate under storage, that is, films be...

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Autor principal: Tucceri, Ismael Ricardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Física
Química
Nickel hydroxide- gold modified electrodes
Charge-transport process
Electron hopping model
Electron and ion diffusion coefficients
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/99538
https://ri.conicet.gov.ar/11336/5091
https://www.semanticscholar.org/paper/A-Study-of-the-Charge-Transport-Process-at-Nickel-Tucceri/467d5c2abf8b1cb614be2a681f3591c3351f46b0
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-99538
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Química
Nickel hydroxide- gold modified electrodes
Charge-transport process
Electron hopping model
Electron and ion diffusion coefficients
spellingShingle Física
Química
Nickel hydroxide- gold modified electrodes
Charge-transport process
Electron hopping model
Electron and ion diffusion coefficients
Tucceri, Ismael Ricardo
A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
topic_facet Física
Química
Nickel hydroxide- gold modified electrodes
Charge-transport process
Electron hopping model
Electron and ion diffusion coefficients
description The aim of the present work was study how the charge-transport process of a nickel hydroxide film electrochemically synthesized on a gold substrate is modified when the electrode is stored without use for long time. It was found that nickel hydroxide films deactivate under storage, that is, films become less conductive than immediately prepared ones (nondeactivated). This study was carried out in the context of the Rotating Disc Electrode Voltammetry (RDEV) and Electrochemical Impedance Spectroscopy (EIS) when the modified electrode contacts an electroactive solution and a redox reaction occurs at the Au−Ni(OH)2|ectrolyte interface. Variations of anodic limiting currents with the electrode rotation rate, for both nondeactivated and deactivated films in the presence of the electroactive solute deferasirox (4-(3,5-bis(2-hydroxyphenyl)-1,2,4-triazol-1-yl) benzoic acid) allowed one obtaining a charge transport rate across a nickel hydroxide film, which decreases with the increase of the storage time. Interpretation of impedance spectra obtained at potential values corresponding to the anodic limiting currents on the basis of an impedance model that considers an uniform and nonporous nickel hydroxide film deposited in a conductive substrate and no penetration of redox species (deferasirox) from the solution, allowed one obtaining different interfacial resistances and electron and ion diffusion coefficients for the Au−Ni(OH)2|ectrolyte system.
format Articulo
Articulo
author Tucceri, Ismael Ricardo
author_facet Tucceri, Ismael Ricardo
author_sort Tucceri, Ismael Ricardo
title A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
title_short A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
title_full A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
title_fullStr A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
title_full_unstemmed A Study of the Charge Transport Process at Nickel Hydroxide-Gold Modified Electrodes employing Rotating Disc Electrode Voltammetry and Ac Impedance Measurements
title_sort study of the charge transport process at nickel hydroxide-gold modified electrodes employing rotating disc electrode voltammetry and ac impedance measurements
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/99538
https://ri.conicet.gov.ar/11336/5091
https://www.semanticscholar.org/paper/A-Study-of-the-Charge-Transport-Process-at-Nickel-Tucceri/467d5c2abf8b1cb614be2a681f3591c3351f46b0
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