The influence of the atomic-level structure of electrode surfaces on electrochemical oscillations has been
studied in a system of H2O2 reduction on Pt electrodes in acidic solutions. A current oscillation of another
type, named oscillation E, has been found to appear for an atomically flat single-crystal Pt(111) electrode, in
addition to previously reported oscillations, named oscillations A and B. Oscillation E does not appear for
atomically flat Pt(100), Pt(110), polycrystalline Pt, and Pt(111) with atomically nonflat surfaces. Mathematical
simulation by use of a model including an autocatalytic effect of adsorbed OH for dissociative adsorption of
H2O2, as a possible explanation, has reproduced the appearance of oscillation E, as well as observed correlations
between the appearance of oscillation E and the magnitudes of H2O2-reduction current and “negative” resistance.
It is discussed that an efficient autocatalytic mechanism works at the atomically flat Pt(111) surface, which
is responsible for the appearance of oscillation E at this surface.
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