Abstract
The conversion behavior of soluble Pb(II) to deposited PbO 2 on platinum in methanesulfonic acid solution was studied with voltammetry and compared with those on glassy carbon and lead oxides. The effects of methanesulfonic acid concentration and Pb(II) concentration, and temperature were considered. The conversion reaction of Pb(II) to PbO 2 on platinum is irreversible and has a high overpotential, more than 300 mV. Low concentration of methanesulfonic acid, high concentration of Pb(II) and high temperature will favor the conversion reaction of Pb(II) to PbO 2. The conversion reaction depends to a great extent on electrode materials. It is more difficult for the conversion reaction of Pb(II) to PbO 2 to take place on glassy carbon than on platinum. However, the conversion reaction of Pb(II) to PbO 2 becomes easy when it takes place on lead oxides, which was formed by reducing PbO 2 under different potentials.
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