Morphology of alpha-lead dioxide electrodeposited on aluminum substrate electrode

Alpha-lead dioxide was deposited by anodization of alkaline solution containing HPbO2− anions. Scanning electron microscopy (SEM) results show that the morphology is remarkably affected by the current density, concentration of HPbO2− anions, bath temperature and electroplating time. Compact and well adherent layers are possibly obtained under conditions of current densities ≤3 mA/cm2 electrolyte containing 4 mol/L NaOH and 0.12–0.14 mol/L lead (II), bath temperature of 40 °C, and electroplating time of 2 h. EDS analyses show that the PbO2 deposited in alkaline condition is highly non-stoichiometric at high current density.