Title :
Investigation of charging, transport and reaction processes in Ti/IrO2-Nb2O5 anodes prepared by a sol-gel derived method
Author :
Terezo, A.J. ; Moura, Valterley A. ; Costa, Mauro M. ; Pereira, Ernesto C.
Author_Institution :
Dept. de Fisica, Univ. Fed. do Mato Grosso, Cuiaba, Brazil
Abstract :
In the present work we investigate the charging, transport and reaction processes in Ti/IrO2-Nb2O5 using electrochemical impedance spectroscopy (EIS). The electrochemical impedance response of the electrodes was modeled using the theory of porous electrodes. The spectra for the electrodes in a wide range of composition have shown the typical behavior of a porous structure, exhibiting a straight line with slope of 45° at high frequency and a CPE in the low frequency domain, depending on the applied dc-potential. The spectra were adjusted to the model and the impedance parameters were extracted and analyzed as function of the electrode composition and applied dc voltage.
Keywords :
anodes; electrochemical electrodes; electrochemical impedance spectroscopy; iridium compounds; niobium compounds; porous materials; sol-gel processing; titanium; Ti-IrO2-Nb2O5; Ti-IrO2-Nb2O5 anodes; applied dc voltage; applied dc-potential; charging process; electrochemical impedance spectroscopy; electrode composition; porous electrodes; porous structure; reaction process; sol-gel method; transport process; Anodes; Coatings; Conductivity; Electrodes; Impedance; Rough surfaces; Solid modeling; Substrates; Surface morphology; Surface roughness;
Conference_Titel :
Electrets, 2005. ISE-12. 2005 12th International Symposium on
Print_ISBN :
0-7803-9116-0
DOI :
10.1109/ISE.2005.1612388
