Original scientific paper

New Stationary Methods for Studying the Kinetics of Redox Reactions Occurring at Inert Semiconductor/Redox Electrolyte Electrodes. III. The »L ∩ a« Method

Liviu Oniciu ; Babes Bolyai University, Faculty of Chemistry and Chemical Engineering, Arany Janos 11, Cluj-Napoca 3400, Romania
Iuliu Ovidiu Marian ; Babes Bolyai University, Faculty of Chemistry and Chemical Engineering, Arany Janos 11, Cluj-Napoca 3400, Romania
Nicolae Bonciocat ; R&D National Institute of Electrochemistry and Condensed Matter, Spi. Independentei No 202, Bucharest - 77208, Romania
Sergiu Borca ; R&D National Institute of Electrochemistry and Condensed Matter, Spi. Independentei No 202, Bucharest - 77208, Romania

Abstract

In this paper a third “intersection method” symbolized »L ∩ a« is theoretically grounded. The method applies to multielectrodes: inert semiconductors/redox electrolyte, and is based on the simultaneously changing of both the intensity of illumination (L), and the activity (activities) of one (or more) electrochemical active species (a). Afirst result refers to the possibility of decomposing the »L ∩ a« method in the two intersection methods, »L ∩ P« and »a ∩ P«, that have been grounded in the first two papers. This result has permitted to use the equations deduced for the »L ∩ P« and »a ∩ P« methods in the first two papers, in order to obtain the equations of potentiostatic, respective galvanostatic »L ∩ a« methods. Further, these equations have been used to get the expression of the specific admittance of the multielectrode. On the basis of this expression, new methods have been grounded for studying the kinetics of electrode redox reactions occurring at inert semiconductor (inert metal)/redox electrolyte electrodes, the semiconductor operating only by one of its energetic bands. Finally, the decomposing law has been generalized to “intersection methods” in which operates an arbitrary number of factors.

Keywords

kinetics of redox reactions; multielectrodes; inert semiconductor/redox electrolyte; illumination; activities

Hrčak ID:

132065

URI

https://hrcak.srce.hr/132065

Publication date:

5.6.2000.

Visits: 955 *