Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions

The anodization of cadmium in NaOH solutions produces a hydrous cadmium hydroxide-cadmium oxide layer and soluble cadmium species in solution. These processes are investigated through conventional voltammetry, potentiostatic, rotating ring disc electrode and complex voltammetric techniques by using...

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Detalles Bibliográficos
Autores principales:	Saidman, S. B., Vilche, Jorge Roberto, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1987
Materias:	Química Ciencias Exactas Cadmium Voltammetric techniques Sodium hydroxide
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/122312 https://www.sciencedirect.com/science/article/abs/pii/0013468687850041
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-122312
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Química Ciencias Exactas Cadmium Voltammetric techniques Sodium hydroxide
spellingShingle	Química Ciencias Exactas Cadmium Voltammetric techniques Sodium hydroxide Saidman, S. B. Vilche, Jorge Roberto Arvia, Alejandro Jorge Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
topic_facet	Química Ciencias Exactas Cadmium Voltammetric techniques Sodium hydroxide
description	The anodization of cadmium in NaOH solutions produces a hydrous cadmium hydroxide-cadmium oxide layer and soluble cadmium species in solution. These processes are investigated through conventional voltammetry, potentiostatic, rotating ring disc electrode and complex voltammetric techniques by using NaOH solutions in the 0.01-1 M range at 25°C. The threshold potential of the anodic reaction is very close to the reversible potential of the Cd/Cd(OH)<sub>2</sub> electrode. The overall anodic and cathodic reactions can be interpreted through a complex reaction model comprising a number of parallel reactions following the initial formation of CdOH<sub>ad</sub> species at the electrode surface level. The relative contribution of each parallel reaction is determined by the concentration of OH− ion at the interface. The reaction model implies a composite structure of layers starting from CdOH<sub>ad</sub> at the electrode surface, and subsequent layers with an increase in the water content on approaching the outmost oxide layer. The water content of anodic layer should increase according to the pH and layer thickness and decrease on increasing the applied potential. Under certain conditions the electrochemical reactions become ohmic resistance controlled. This fact presumably involves the formation of aged species and the onset of passivity.
format	Articulo Articulo
author	Saidman, S. B. Vilche, Jorge Roberto Arvia, Alejandro Jorge
author_facet	Saidman, S. B. Vilche, Jorge Roberto Arvia, Alejandro Jorge
author_sort	Saidman, S. B.
title	Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
title_short	Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
title_full	Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
title_fullStr	Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
title_full_unstemmed	Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
title_sort	non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions
publishDate	1987
url	http://sedici.unlp.edu.ar/handle/10915/122312 https://www.sciencedirect.com/science/article/abs/pii/0013468687850041
work_keys_str_mv	AT saidmansb nonstationaryelectrochemicalresponseofpolycrystallinecadmiuminsodiumhydroxidesolutions AT vilchejorgeroberto nonstationaryelectrochemicalresponseofpolycrystallinecadmiuminsodiumhydroxidesolutions AT arviaalejandrojorge nonstationaryelectrochemicalresponseofpolycrystallinecadmiuminsodiumhydroxidesolutions
bdutipo_str	Repositorios
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Non-stationary electrochemical response of polycrystalline cadmium in sodium hydroxide solutions

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