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

摘要:

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 H₂SO₄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-PbO₂含量更高，而PbSO₄含量更低。

Abstract:

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 H₂SO₄ solution at 45 °C. 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 3D through-hole structure, which increases the oxygen evolution surface area of the anode. Furthermore, the content of β-PbO₂ and PbSO₄ in the oxide layer of 3D through-hole Pb-Ca-Sn is higher and lower than those of Pb-Ca-Sn, respectively.