Effect of Cadmium and Lead Adatoms
on the Reduction Kinetics of Peroxodisulfate Anions
at Platinized Platinum in Acid Solutions

T. G. Nikiforova^a and O. A. Petrii^b,z

^a St. Petersburg State University,
Universitetskii pr. 2, St. Petersburg, 198904 Russia
^b Moscow State University,
Vorob’evy Gory 1, Moscow, 119992 Russia

Received April 8, 2004

Abstract—The reduction of peroxodisulfate anions on a rotating Pt/Pt disk electrode in solutions of sulfuric
and perchloric acids with or without cadmium and lead salts is studied. At E_r > 0.2 V (RHE) the reduction rate
in HClO₄ exceeds that in H₂SO₄, but at E_r < 0.2 V, the process in HClO₄ is strongly inhibited upon approaching
E_r = 0. Lead adatoms catalyze the process, while cadmium adatoms inhibit it in H₂SO₄ and accelerate it at
E_r<0.2 V in HClO₄. The results are interpreted by taking account of the specific adsorption of sulfuric-acid
anions and their co-adsorption with cadmium cations, as well as the adsorption of peroxodisulfate anions on the
Pt surface modified by lead and cadmium ions in perchlorate solutions.

Key words: peroxodisulfate, electrocatalysis, adatoms, co-adsorption

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