Abstract
The open circuit potential transients and cathodic potentiodynamic pulses were measured upon formaldehyde (methylene glycol) interaction with pre-adsorbed oxygen (Oads) on Pt/Pt and pc Pt electrodes in aqueous sulfuric acid solutions. The slowest interaction of CH2(OH)2 with Oads was observed in the high coverage range of the electrode surface (θO ∼ 0.2 0.8 to 1). The process rate in this range is determined by the direct reaction of Oads with CH2(OH)2 molecules from the bulk solution. In the middle surface oxygen coverage range (θO 0.2 to 0.8), CH2(OH)2 interaction with Oads takes place by the mechanism of “conjugated reactions”. The kinetic parameters of reactions for CH2(OH)2, HCOOH, and CH3 OH were compared. The rate of CH2(OH)2-Oads interaction on Pt electrodes in the high oxygen coverage range was found higher by an order of magnitude than that of HCOOH and by two orders of magnitude than in the case of CH3OH.
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