Journal of Applied Electrochemistry, Vol.48, No.7, 783-791, 2018
Effects of deposition time and current density on PbO2 electrosynthesis from methanesulfonate electrolyte
This work investigated the effects of current density and deposition time on the properties of electrodeposited PbO2. The PbO2 preparation was conducted on Ti/SnO2-Sb substrates by galvanostatic anodic deposition in a newly proposed methanesulfonate electrolytic solution. Phase constituents and microstructures of the deposited PbO2 coatings were characterized. Increasing current density in the range 100 mA cm(- 2) leads to the formation of highly textured coatings with an increased content of alpha-PbO2 phase. Concurrently, a high current density favors a compact and flat surface morphology. The study of deposition time indicates a change of crystallite growth manner from an initially random growth to a later-stage preferred growth along distinct orientations. The change of crystallite growth is corroborated by the cross-sectional microstructures of the PbO2 deposits. The microstructural transition occurs only in the initial deposition stage. After a brief period, prolonged electrodeposition barely changes the surface morphology of PbO2 coatings. [GRAPHICS] .
Keywords:Electrodeposition;Current density;Deposition time;Lead dioxide;Methanesulfonate electrolyte