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

金属学报(英文版), 2009, 22(5): 373-382. doi: 10.1016/S1006-7191(08)60111-8

^1, , ^2, , ^3, , ^4, , ^5,

1.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

2.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

3.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

4.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

5.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

基金项目: the Author of National Excellent Doctoral Dissertation of China(20050053) Analysis and Measurement Research Fund((2007-21)A)

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

Burning CHEN ^1, , Zhongcheng GUO ^2, , Hui HUANG ^3, , Xianwan YANG ^4, , Yuandong CAO ^5,

1.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

2.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

3.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

4.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

5.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China

Keywords： Alpha lead dioxide

The α-PbO_2 electrodes are prepared by anodic electrodeposition on Al/conductive coating electrode from alkaline plumbite solutions in order to investigate the effect of the different current densities on the properties of α-PbO_2 electrodes. The physic-ochemical properties of the α-PbO_2 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 PbO_2 deposited in alkaline conditions is highly non stoichiometric, and the PbO impurities are formed on the surface layer besides the α-PbO_2. The corrosion resistance of α-PbO_2 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 Zn~(2+) 50 g·L~(-1), H_2SO_4 150 g·L~(-1), the Al/conductive coating/α-PbO_2 exhibits lower potential compared to Pb electrode. Al/conductive coating/α-PbO_2 electrode with the best electrocatalytic activity was obtained at current density of 1 mA·cm~(-2). The lowest roughness factor was obtained at 1 mA·cm~(-2).

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

参考文献