铜电积用3D-Pb-Ca-Sn阳极的电化学性能和微观形貌

Electrochemical Properties and Microtopography of 3D Through-Hole Pb-Ca-Sn Anode for Copper Electrowinning

制备的3D-Pb-Ca-Sn阳极有望成为性能优良的铜电积阳极材料。在160 g/L H_(2)SO_(4)溶液中、45℃条件下,采用恒流极化、电化学阻抗谱、阳极极化和双斜率Tafel曲线等方法研究了3D-Pb-Ca-Sn和传统Pb-Ca-Sn阳极的电化学性能。此外,还对2种阳极氧化层的微观形貌、元素分布和物相组成进行了研究。结果表明,3D-Pb-Ca-Sn阳极具有优良的三维通孔结构,增加了阳极的析氧表面积;因此,与传统的Pb-Ca-Sn阳极相比,3D-Pb-Ca-Sn阳极具有更低的阳极电位、更高的交换电流密度和更好的电催化活性,且其氧化层中β-PbO_(2)含量更高,而PbSO_(4)含量更低。

3D through-hole Pb-Ca-Sn anode was prepared which may be a promising anode with excellent performance for copper electrowinning.And the electrochemical properties of 3D through-hole Pb-Ca-Sn anode and Pb-Ca-Sn anode were studied by galvanostatic polarization,electrochemical impedance spectroscopy,anodic polarization and double-Slope Tafel carried out in 160 g/L H_(2)SO_(4) solution at 45℃.Besides,the micro-morphology,element distribution and phase composition of the oxide layer were investigated.Results show that compared with the traditional Pb-Ca-Sn,3D through-hole Pb-Ca-Sn anode shows much lower anodic potential,higher exchange current density and better electrocatalytic activity.These characteristics are related to its excellent 3 D through-hole structure,which increases the oxygen evolution surface area of the anode.Furthermore,the content of β-PbO_(2) and Pb SO_(4) in the oxide layer of 3D through-hole Pb-Ca-Sn is higher and lower than those of Pb-Ca-Sn,respectively.