Effects of polyaniline on electrochemical properties of composite inert anodes used in zinc electrowinning

来源期刊:中国有色金属学报(英文版)2012年第7期

论文作者:詹鹏 徐瑞东 黄利平 陈步明 周建峰

文章页码:1693 - 1700

关键词:复合惰性阳极材料;双脉冲电沉积;阳极极化曲线;循环伏安曲线;塔菲尔极化曲线;微观组织

Key words:composite inert anodes; double pulse electrodeposition; anodic polarization curves; cyclic voltammetry curves; Tafel polarization curves; microstructures

摘    要:为了寻找一种可以替代锌电积用Pb-Ag合金的阳极材料,通过PANI(聚苯胺)、WC(碳化钨)颗粒与Pb2+的双脉冲电沉积,在Al合金基体上制备了Al/Pb-PANI-WC复合惰性阳极材料。测试了镀液中不同PANI浓度下制备的惰性阳极材料的阳极极化曲线、循环伏安曲线和塔菲尔极化曲线,采用扫描电镜考察复合惰性阳极材料的微观组织特征。结果表明:当将制备镀液中PANI浓度控制在20 g/L时,Al/Pb-PANI-WC复合惰性阳极材料的微观组织和成分分布均匀,在含50 g/L Zn2+、150 g/L H2SO4的35 ℃锌电积液中具有较高的电催化活性、较好的电极反应可逆性和耐腐蚀性,在电流密度500 A/m2和1000 A/m2下的析氧过电位与Pb-1%Ag合金相比分别降低了185 mV和166 mV。

Abstract: In order to search for a suitable anode material used in zinc electrowinning in place of Pb-Ag alloy, Al/Pb-PANI (polyaniline)-WC (tungsten carbide) composite inert anodes were prepared on aluminum alloy substrate by double pulse electrodeposition (DPE) of PANI and WC particles with Pb2+ from an original plating bath. Thereafter, anodic polarization curves, cyclic voltammetry curves and Tafel polarization curves for the composite inert anodes obtained under different PANI concentrations in the original plating bath were measured, and the microstructural features were also investigated by scanning electron microscopy (SEM). The results show that Al/Pb-PANI-WC composite inert anode obtained under PANI concentration of 20 g/L in the original plating bath possesses uniform microstructures and composition distributions, higher electrocatalytic activity, better reversibility of electrode reaction and corrosion resistance in a synthetic zinc electrowinning electrolyte of 50 g/L Zn2+, 150 g/L H2SO4 at 35 ℃. Compared with Pb-1%Ag alloy, the overpotential of oxygen evolutions for the composite inert anode are decreased by 185 mV and 166 mV, respectively, under 500 A/m2 and 1000 A/m2.

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