Np. Osipovich et Ea. Strel'Tsov, Lead adatoms on submonolayers of selenium and tellurium deposited on a gold electrode, RUSS J ELEC, 36(1), 2000, pp. 1-7
Electrochemical adsorption-desorption of lead atoms (Pb-ad) on a gold elect
rode covered by submonolayers of selenium and tellurium (Au/Se-ad, Au/Te-ad
) is studied at potentials exceeding the equilibrium potential of the Pb(II
)-Pb(0) system. Cyclic voltammetry reveals that energy states of lead adato
ms depend on the presence of submonolayer or supermonolayer amounts of a ch
alcogen. The underpotential deposition of lead adatoms on Au/Se-ad and Au/T
e-ad is irreversible, which is due to the formation of chemical bonds Pb-Se
and Pb-Te. Electrochemical adsorption of lead atoms on Au/Se-ad and Au/Te-
ad leads to the formation of submonolayers of lead chalcogenides Au/PbSead
and Au/PbTead. Stability of submonolayer structures of Au/Se-ad, Au/Te-ad,
Au/PbSead, and Au/PbTead is studied under open-circuit conditions. The stru
ctures have rather long storage times (dozens of minutes) in aqueous acid s
olutions of HNO3 saturated with argon.