Mechanism of lead dioxide electrodeposition

The electrodeposition of PbO2 from HClO4 solutions of Pb(II) at an Au rotating ring disk electrode was studied as a function of applied potential and rotational velocity. Experimental data have shown that the process of PbO2 formation has several stages. The first stage is the formation of oxygen containing particles as OHads, chemisorbed on the electrode. At the next chemical stage, these particles interact with lead compounds forming the soluble intermediate product Pb(OH)(2+) which is further oxidized electrochemically to form PbO2. Pb(III) intermediate products were detected on a gold ring electrode at more positive potentials.