Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

Autor:	M.H. Mendonça, J. Douch, Y. Berghoute, M. I. S. Pereira, E. Laouini, Ravindra N. Singh, Mohamed Hamdani
Rok vydání:	2008
Předmět:	Materials science Open-circuit voltage General Chemical Engineering Spinel Analytical chemistry Oxide engineering.material Dielectric spectroscopy chemistry.chemical_compound chemistry Electrode Materials Chemistry Electrochemistry engineering Equivalent circuit Cyclic voltammetry Cobalt oxide
Zdroj:	Journal of Applied Electrochemistry. 38:1485-1494
ISSN:	1572-8838 0021-891X
DOI:	10.1007/s10800-008-9593-4
Popis:	Spinel type Co3O4 thin films, for the oxygen evolution reaction (OER) in 1 M KOH, have been prepared, on stainless steel supports, using the thermal decomposition method at 400 °C. The electrochemical behaviour of the oxide film/1 M KOH interface was investigated by cyclic voltammetry and impedance techniques. The impedance measurements were carried out at different positive potentials, from the open circuit potential to a potential in the OER region and the electrical equivalent circuit, L (R1Q1) (R2Q2) (R3Q3) was used to fit the experimental results. At each potential, a good correlation between experimental and simulated data is found, thereby validating the proposed equivalent circuit model. The roughness factor value determined in the potential region where the charge transfer reaction is negligible is similar to that obtained by cyclic voltammetry, with a value of 70 ± 2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ddd8d6bad44c133e0983324985343ff5 https://doi.org/10.1007/s10800-008-9593-4 Zobrazit plný text záznamu Plný text ve formátu PDF