Theory for Induced Charging Currents in Potentiostatic Chronoamperometry Involving Coupled Chemical Reactions. Applications to Photoelectrochemistry.
Abstract
Previously a theoretical model was developed for characterizing the charging currents induced by changing faradaic currents measured under potentiostatic conditions. This paper describes application of the theoretical model to measurements involving electrolysis mechanisms complicated by competing reactions. The model is particularly relevant for flash photoelectrochemical studies. The mechanisms considered here include 1st-order and 2nd-order decay of electroactive photoproducts. The dependence of measured currents on various experimental and chemical parameters--including the cell time-constant, photoproduct concentrations, and rate constants--is described for a wide range of conditions. Theoretical relationships can be used to predict total measured currents, or to tabulate correction factors to extract purely faradaic currents from measured currents. In addition, an alternative derivative-correction method for extracting faradaic signals from combined currents is described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA015642
Entities
People
- S. P. Perone
- S. S. Fratoni Jr.
Organizations
- Purdue University