Cyclic voltammetric behaviour and some surface characteristics of the lead electrode in aqueous HCl solutions.
The positive linear sweep voltammograms of lead were investigated in 0.01-2.00 M aqueous HCl solutions. The results revealed the occurrence of one anodic current peak as the result of formation of a thin PbCl2 surface layer. Intensive study of the electrochemical behaviour of the lead electrode in 1.00 M HCl solution was carried out by cyclic voltammetry. The results indicated that the formation of PbCl2 is a reversible process controlled by diffusion of Cl- ions to the electrode surface. Controlling the voltammetric conditions enabled the building up of a relatively thick and porous PbCl2 layer that could resist rupture or breakdown. In addition, the electrode surface products were examined by scanning electron microscopy and X-ray diffractometry. The morphology of the as-formed PbCl2 layers showed a primitive dependence on the voltammetric conditions. X-ray diffraction analysis proved that only PbCl2 was formed on the electrode surface and no other products could be detected.
Abd el-Halim
A M
AM
Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt.
Fawzy
M H
MH
Saty
A
A
D004563:Electrochemistry; D004566:Electrodes; D004573:Electrolytes; D006851:Hydrochloric Acid / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D012996:Solutions; D013499:Surface Properties; D014961:X-Ray Diffraction
D004573:Electrolytes; D012996:Solutions; D007854:Lead; C029891:lead chloride; D006851:Hydrochloric Acid