Review on Recent Trends on electrochemistry of lead, aluminum and nikel

In this review we present some of our investigation in electrochemistry of Pb Al and Ni. We have already presented details of the studies in a number of published papers [1-3]. Lead chal. pbS, pbSe and pbTe and their alloys have importance technological application. This respect semiconducting properties of PbS was studied. The voltammetric of PbS film in SO4Na2 solution shows that oxidative dissolution of PbS film accrues at about 0.21 V vs Ag/AgCl and total filmdetachment from the surface occurred with increasing potential .The flat band potential and carrier concentration determined to be -0.32V and 1.6*10 23 m-3 respectively .The film was P type semiconductor [1]. The electrocrystallization of metal on foreign substrate has attracted agreat deal of interest in modern electrochemistry due to its technological advantage. Electrochemical deposition of aluminum and lead from basic molten AlCl3 – NaCl-KCl mixture on an aluminum electrode at 180 c was studied by cyclic voltammetry .the deposition ofaluminum was found to be diffusion control .The diffusion calculated for Pb+2 ions in basic melt by voltammetry was obtained . The deposition process of lead on al substrate was controlled by 3d diffusion control, nucleation and growth [2]. Intensive research have been directed towards the development of electro-catalysis aiming at lowering the normaly large overpotential encountered in the electrooxidation of materials and in particular the fuel cells in the merging fuel cell systems. We studied electrocatalytic oxidation of methane at nickel hydroxide modified nickel electrode in alkaline solution. Our results demonstrate the preparation of modified nickel electrodes through the electrochemical formatin ofNiOOhsurface film .The possible usefulness of the modified electroes in the mediated electro oxidation of methane in alkaline solution .The mechanism of methane oxidation is reported in terms of formation of intermediates [3].