Kinetic Considerations of the Electrogenerated Luminescence of Luminol at Platinum Electrode in the Presence of Hydrogen Peroxide and Oxygen

摘要

The ECL behavior of the luminol/H_2O_2 and luminol/O_2 systems was evaluated at Pt electrode by using diffeerent electroanalytical techniques such as chronoamperometry, cyclic and rotating disk electrode (RDE) voltammetry. Diffusive and kinetic parameters such as the diffusion coefficient of luminol, D, the number of exchanged electrons, n, and the apparent heterogeneous rate constant, k_ap, were determined in the maxium light emission conditions achieved at pH 11, at an electrode potential of 750 mV vs. SCE. The experimental order of reaction were determined from the relation between the reactant concentrations and the emitted light intensity.