Development of a microporous titanium based PbO2–MnO2 anodes in zinc electrowinning process
摘要
In the current work, anodic electrodeposition in an electrolyte containing varying concentrations of Mn(NO3)2.4H2O was used to fabricate a novel titanium-based Mn-doped PbO2 coating on titanium substrate. Energy-dispersive spectroscopy (EDS) and scanning electron microscopy (SEM) were used to characterize the microstructure of the coatings. The electrochemical behavior and the stability of the electrodes was assessed using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and the accelerated life test (ALT). Furthermore, in the zinc electrowinning process, the performance of PbO2–MnO2 anodes was compared with PbO2 and traditional Pb–Ca–Sn anodes. These findings demonstrated that the creation of a microporous coating is promoted by the doping of Mn into PbO2 coating. It was discovered that the PbO2–MnO2 anode had a greater service life than both PbO2 and traditional Pb anodes. In comparison to PbO2 and Pb anodes, the Mn-doped anode has the lowest charge transfer resistance and the best electrocatalytic activity. Additionally, in the zinc electrowinning process, the composite PbO2–MnO2 anode shows higher efficiency, higher corrosion resistance, longer service life, and lower cell voltage.
Graphical abstract