E. Herrero et al., THE UNUSUAL ADSORPTION STATES OF PT(111) ELECTRODES STUDIED BY AN IODINE DISPLACEMENT METHOD - COMPARISON WITH AU(111) ELECTRODES, Surface science, 325(1-2), 1995, pp. 131-138
The process of iodine adsorption on Pt(lll) and Au(lll) electrodes is
utilized to identify the nature of unusual adsorption states on the Pt
(lll) electrode. The application of iodine allows the adsorbate replac
ement measurements at higher potentials than it has previously been pr
actised with CO, thus enabling the study of Pt(lll) in perchloric acid
medium. The comparison between the results obtained with the two prob
es leads to self-consistency of the previous and present results. The
data obtained with the two electrodes (and in the two supporting elect
rolytes) are mutually consistent. In sulphuric acid, we confirm that a
dsorption of an anion (sulfate or bisulfate) accounts for the unique f
eatures of the Pt(lll) voltammetry. We also provide experimental resul
ts for identifying the origin of the unusual adsorption states in perc
hloric acid solution.