DISTRIBUTION AND LASER-INDUCED BEHAVIOR OF LEAD MONOOXIDE ON LEAD ELECTRODES IN ACID-SOLUTION

The distribution and laser-induced behaviour of PbO on lead electrodes have been investigated using photoelectrochemical microscopic (PEM) a nd cyclic voltammetric techniques. A linear relationship between the p otential of the reduction peak for lead monooxide and the pre-oxidatio n time of the electrodes was obtained at low potential-sweep rates. Th is result implies that the changes of pH within the inner anodic films could be estimated using the electrochemical method. Some interesting photocurrent characteristics of ''laser-induced'' oxide ''islands'' h ave been observed. In addition, a linear growth mode of PbO has been f ound at an early stage of growth of the anodic films using a ''line-sc an'' method in the PEM technique.