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 pote ntial and rotational velocity. Experimental data have shown that the p rocess of PbO2 formation has several stages. The first stage is the fo rmation of oxygen containing particles as OHads, chemisorbed on the el ectrode. At the next chemical stage, these particles interact with lea d compounds forming the soluble intermediate product Pb(OH)(2+) which is further oxidized electrochemically to form PbO2. Pb(III) intermedia te products were detected on a gold ring electrode at more positive po tentials.