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Electrode process of deposition and dissolution of the Al-Pb binary-system in an organic electrolyte .1. Lead(II) bromide and aluminum(III) bromide reduction in ethylbenzene electrolyte

M. Gálová, L. Lux, and K. Župčanová

Department of Chemistry, Faculty of Metallurgy, Technical University, CS-04385 Košice

 

Abstract: The deposition reactions of metallic lead and aluminium from AlBr3+PbBr2+KBr solution in ethylbenzene have been studied using cyclic voltammetry and chronopotentiometry as methods. The reduction of AlBr3 in the absence of PbBr2 proceeds nearly reversibly at zero electrode potential vs. aluminium electrode. The addition of PbBr2 causes negative shift of the aluminium deposition potential of about 50—70 mV. The difference between lead and aluminium deposition potentials is approximately 300 mV contrary to 1400 mV in aqueous solution. This fact is very important from the point of view of simultaneous deposition of both metals. PbBr2 is reduced in two steps. The reduction process is diffusion-controlled at sufficiently high scan rate values. A slow catalytic chemical reaction proceeding between both electrode reduction steps has been observed at lower scan rate values leading to the decrease of voltammetric current. Possible explanations of this effect are discussed.

Full paper in Portable Document Format: 423a281.pdf

 

Chemical Papers 42 (3) 281–290 (1988)

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