Effect of the current density on electrodepositing alpha-lead dioxide coating on aluminum substrate

doi:10.1016/S1006-7191(08)60111-8

Abstract

Abstract:

The α-PbO₂ electrodes are prepared by anodic electrodeposition on A1/conductive coating electrode from alkaline plumbite solutions in order to investigate the effect of the different current densities on the properties of α-PbO₂ electrodes. The physicochemical properties of the α-PbO₂ electrodes are analyzed by using SEM, EDS, XRD, Tafel plot, linear sweep voltammetry (LSV) and A.C. impedance. A compact and uniform layer of lead dioxide was obtained at the current density of 3 mA·cm^-2. A further increase in current density results in smaller particles with high porosity. EDS and XRD analyses have shown that the PbO₂ deposited in alkaline conditions is highly non stoichiometric, and the PbO impurities are formed on the surface layer besides the α-PbO₂ . The corrosion resistance of α-PbO₂ at the low current density is superior to that of the high current density. It can be attributed to a porous layer of deposited films at high current densities. When used as anodes for oxygen evolution in aqueous Zn²⁺ 50~g·L^-1, H₂SO₄ 150~g·L^-1, the Al/conductive coating/α-PbO₂ exhibits lower potential compared to Pb electrode. Al/conductive coating/α-PbO₂ electrode with the best electrocatalytic activity was obtained at current density of 1mA·cm^-2. The lowest roughness factor was obtained at 1 mA·cm^-2.

Key words: Alpha lead dioxide, Electrodeposition, Current density, Anodes, Oxygen evolution

Buming CHEN,Zhongcheng GUO,Hui HUANG,Xianwan YANG,Yuandong CAO. Effect of the current density on electrodepositing alpha-lead dioxide coating on aluminum substrate[J]. Acta Metallurgica Sinica (English Letters), 2009, 22(5): 373-382.

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