Galvanic displacement of copper adatoms on platinum in PtCl42- solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: The kinetics of interaction of copper adatoms Cu-ad on polycrystalline
Pt (pc Pt) with PtCl42- (0.5 M H2SO4 supporting electrolyte) at open
circuit is studied. Hidden currents of Cu-ad displacement (i(hid)(-Cu))
are compared with exchange currents of Cu2+ + 2e reversible arrow Cu-ad
reaction determined by the impedance method and also with hidden
currents of platinum deposition on pc Pt under open-circuit conditions.
The substantial excess of i(hid)(-Cu) high 0(Cu) over the Pt deposition
currents (in absence Cu-ad) is attributed to the "direct" chemical
interaction between PtCl42- and Cu-ad. The anomalous increase in i(hid)
with increasing potential at small 0(Cu) is explained by the involvement
of adsorbed oxygen forms in the displacement process. CVA and transients
of open-circuit potential are measured on the Pt(1 1 1) electrode. For
measurements "in the solution meniscus", the displacement process on
Pt(1 1 1) and pc Pt was shown to be largely diffusion controlled. (c)
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