Kinetics of Oxidation of Reduced Forms of Adsorbed CO2 on a (pc)Pt Electrode in Saturated H2CO3 under Quasi-Equilibrium Conditions: The Effect of the Potential Oscillationsстатья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:The relationship between the kinetics of the oxidation of adsorbed forms of reduced CO2 (rCO2), which is the slow subsystem, and
the oscillating nature of the oxidation of rCO2, the fast subsystem, on the surface of a polycrystalline Pt electrode under quasireversible
open-circuit conditions and galvanostatic experimental conditions in a saturated aqueous solution of H2CO3 was
established. The reaction rate constant k of rCO2 oxidation and the transfer coefficient α were obtained. It is shown that the process
proceeds in conditions close to the barrier-free regime. The possibility of participation in the oxidation reaction of OH• species
generated during the catalytic decomposition of H2O2 as the main product during the conjugated oxygen reduction reaction (ORR)
is confirmed. It is shown that the use of the “helium washed” water can be a convenient system for determining small
concentrations of dissolved O2. It was possible to minimize the effect of the conjugative ORR on the Pt surface and to consider in
detail the dynamics and kinetics of the oxidation of adsorbed rCO2. This will allow the obtained results to be used in the future for
the preparation of highly sensitive oxygen sensors and for development of efficient fuel cells.