Preparation And Properties Of Composite Coating Modified Titanium Anode For Electrolytic Manganese Dioxide

Anode plates have some disadvantages in the electrolysis, such as easy distortion, low current density, high power consumption, et al. In order to solve these problems, the composite coating of MnO2 and SnO2 was prepared on titanium anode by a simple thermal decomposition method. The surface morphology of the composite coating was characterized by SEM. Results show that the coating is dense and smooth with a layer structure. The properties of composite coating are studied by testing the polarization curve, cyclic voltammetry curves and calculating the voltammetry curve integral area. It is showed that the optimum coating is Sn/Mn with a ratio 6 : 4 sintering at 450 degrees C The composite coating anode has much obvious advantages, compared with lead anode, lead silver alloy anode and the titanium anode. Higher purity MnO2 has obtained by using the composite coating anode. The voltage is reduced about 0.2 V improved the current efficiency. Therefore, the composite coating anode is suitable for the anode plate of large electrodes.