Kinetic considerations on the electrogenerated luminescence of luminol at platinum electrode in the presence of hydrogen peroxide and oxygen.
The ECL behavior of the luminol/H2O2 and luminol/O2 systems was evaluated at Pt electrode by using different 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, kap, were determined in the maximum 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.
Pastore
Paolo
P
Department of Inorganic, Organometallic and Analytical Chemistry, University of Padova, Via Marzolo 1, 35131, Padova, Italy. pastore@chin.unipd.it
Favaro
Gabriella
G
Gallina
Albino
A
Antiochia
Riccarda
R
D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000737:chemistry; D007700:Kinetics; D008163:Luminescent Measurements; D008165:Luminol / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum
D007202:Indicators and Reagents; D010984:Platinum; D008165:Luminol; D006861:Hydrogen Peroxide; D010100:Oxygen