Electrochemical Properties of Pb–0.3%Ag/Pb–Co3O4 Composite Inert Anodes

Chinese Journal of Materials Research

2012, Vol. 26

Issue (5): 495-502 DOI:

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Electrochemical Properties of Pb–0.3%Ag/Pb–Co₃O₄ Composite Inert Anodes

KONG Ying^1,2, XU Ruidong^1,2, HUANG Liping², GUAN Yongyong^1,2, CHEN Buming^1,2

1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093
2.State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming 650093
3.Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050

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KONG Ying XU Ruidong HUANG Liping GUAN Yongyong CHEN Buming. Electrochemical Properties of Pb–0.3%Ag/Pb–Co₃O₄ Composite Inert Anodes. Chinese Journal of Materials Research, 2012, 26(5): 495-502.

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Abstract

Pb–0.3%Ag/Pb–Co3O4 composite inert anodes were prepared on the surface of Pb–0.3%Ag substrates, the electrochemical properties of the composite inert anodes obtained under different forward pulse average current densities from 2 A/dm2 to 5 A/dm2 and different Co3O4 concentrations from 10 g/L to 40 g/L in bath were investigated. The anodic polarization curves, cyclic voltammetry curves and Tafel polarization curves were measured in a synthetic zinc electrowinning electrolyte of 50 g/L Zn2+ and 150 g/L H2SO4 at 35 , the kinetic parameters of oxygen evolution, voltammetry charge, corrosion potential and corrosion current were obtained. The results show that Pb–0.3%Ag/Pb–Co3O4 composite inert anode obtained under forward pulse average current density of 3 A/dm2 and Co3O4 concentration
of 30 g/L in bath, possess higher electrocatalytic activity, lower overpotential of oxygen evolution, better reversibility of electrode reaction and corrosion resistance in a synthetic zinc electrowinning electrolyte. The overpotential of oxygen evolution of the composite inert anode is 0.891 V under 500 A/m2, and it is 280 mV lower than that of Pb–1%Ag alloy; the surface voltammetry charge q∗ is 0.725 C·cm−2, and is 26.5% higher than that of Pb–1%Ag alloy; the corrosion current is also lower than that of Pb–1%Ag alloy. Large active surface areas and active substance numbers on the surface of the composite inert anode improve the electrocatalytic activity for oxygen evolution in [ZnSO4+H2SO4] solution. Fine and uniform grains, compact microstructures and fewer surface defects increase the corrosion resistance of the composite inert anode.

Key words: composite materials double–pluse electrodeposition composite inert anod Co3O4 electrochemical properties

Received: 09 July 2012

ZTFLH:

TB321

Fund:

Supported by National Natural Science Foundation of China No.51004056 and Opening Foundation of Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences No.KKZ6201152009.

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