Abstract
Measurement of the differential capacitance of α- and β-PbO 2 electrodes in phosphate electrolytes are presented. Phosphate ion is adsorbed at the electrode. Reversible redox reactions involving H + and phosphate ion adsorbed at the electrode occur within the polarizable region. These reactions give rise to high electrode capacitances (adsorption capacitances). At potentials negative to the experimental polarizable region, differences in capacitance between the present results and those reported in the case of sulphate electrolytes are significant. It is concluded that highly adherent insulating films, characteristic of the PbO 2 /H 2 SO 4 system are not developed as a product of the reduction of the PbO 2 lattice in phosphoric acid.
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