This paper reports novel catalytic properties of amorphous IrO2-Ta2O5 coatings prepared by thermal decomposition for industrial electrolysis applications, especially zinc electrowinning The coating formed on a titanium substrate can accelerate oxygen evolution in H2SO4 solutions and suppress the anodic deposition of MnOOH. The results are valuable to reduce the anode potential and prevent the deactivation of the anode surface by MnOOH deposition in zinc electrowinning