✍ Scribed by Regina M.Q. Mello; Edson A. Ticianelli
No coin nor oath required. For personal study only.
this work an investigation of the hydrogen oxidation reaction at platinum and at platinum/polymer electrolyte interfaces in contact with aqueous solutions composed of mixtures of HzS04 and KzS04 (pH range of 0.2-7.5) was carried out. The studies were conducted using cyclic voltammetry, rotating disk electrode and potential step chronoamperometry. The results allowed the determination of the solubility and the diffusion coefficient of the hydrogen gas in the aqueous solutions and the permeability in the polymer electrolyte. Specific theoretical treatments were employed in order to allow the interpretation of the experimental data and to characterize the kinetic and the mechanism of the hydrogen oxidation reaction.
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The kinetics and mechanism of the reaction of chemisorbed oxide (P1-0) layer (in a smooth Pt electrode with H 2 dissolved in 1 M H,S0 4 solution were investigated under the open circuit condition. It was found that a monolaver of Pt-0 no the electrode surface is reduced first at a slow rate which i