Temperature dependent impedance analysis of semiconducting RuS2 electrodes in liquid and frozen HClO4·5.5H2O electrolyte

✍ Scribed by H. Colell; N. Alonso-Vante

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 474 KB
• Volume: 38
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(93)80317-s

✦ Synopsis

Impedance measurements on n-R&, electrodes in darkness and under illumination in aqueous perchloric acid in the temperature range 200-295K and electrode potential range 0-1.6V/rhe have been performed. A NLLS-analysis of our data using a Voigt-type kinetic electrical circuit with a total of five elements: series resistance, semiconductor resistance, charge transfer resistance, space charge capacity and Helmholtz layer capacity was made. The dependence of the parameters as a function of temperature, electrode potential and illumination is discussed. From the resulting activation energies it was possible to distinguish between the semiconductor side (surface charging) and the heterogeneous charge transfer processes (oxygen evolution) in darkness and under illumination.