Preparation and electrochemical properties of a novel porous Ti/Sn–Sb-RuO_x/β-PbO₂/MnO₂ anode for zinc electrowinning

PbO2 electrodes exhibit symmetry on the CV curve in MnSO4 bath (oxidation peak occurs at 1.00–1.40 V) and asymmetry in Mn(NO3)2 plating solution (negative current value at 1.00–1.18 V). The current rapidly rises to a large peak current at 1.25 V.