info:eu-repo/semantics/article
Kinetic Study of the Formic Acid Oxidation on Steady State Using a Flow Cell
Fecha
2017-08Registro en:
Luque, Gisela Carina; Gennero, Maria Rosa; Chialvo, Abel Cesar; Kinetic Study of the Formic Acid Oxidation on Steady State Using a Flow Cell; Electrochemical Society; Journal of the Electrochemical Society; 164; 12; 8-2017; H748-H754
0013-4651
CONICET Digital
CONICET
Autor
Luque, Gisela Carina
Gennero, Maria Rosa
Chialvo, Abel Cesar
Resumen
The formic acid oxidation (FAO) reaction is studied on platinum in acid solutions using a specially designed flow cell and different experimental techniques, such as open circuit potential decay, chronoamperometry, voltammetric stripping, HCOOH concentration pulses and rotating disc electrode. It allows for the first time the evaluation of the surface coverage of irreversibly adsorbed reaction intermediates on steady state conditions. It is found that the unique species adsorbed irreversibly is CO (E < 0.5 V). It is demonstrated that at higher potentials the adsorption of the intermediate species involved in the FAO is highly reversible and their decomposition is the rate determining step. From the analysis of the results and taken into account available spectroscopic measurements, a new reaction mechanism is proposed, which is compatible with all the known experimental evidences and allows the interpretations of previous unexplained results.