第38回 GREENオープンセミナー

A chronoamperometric method will be presented that allows correlations to be established between the rates of the oxygen reduction reaction, ORR, on the Pt disk of a rotating Pt-ring|Pt-disk electrode, the coverage of adsorbed halide, qX-, X- = Cl- or Br-, the amount of solution phase hydrogen peroxide, H₂O₂, generated at the disk and the applied potential. Experiments were carried out in O₂-saturated 0.1 M HClO₄ aqueous solutions containing Cl- or Br- at concentrations in the μM range and involved application of a potential step from a value at which there is no X- adsorption, Eo, to a more positive potential at which X- undergoes adsorption under strict diffusion control.