Performance characterization of Ti substrate lead dioxide electrode with different solid solution interlayers

In this study, Ti substrate was coated by three different mixed oxides (SnO₂–Sb₂O₅, RuO₂–TiO₂, IrO₂–Ta₂O₅), then PbO₂ was electrodeposited on them to prepare PbO₂ electrode. The microstructure of the solid solution interlayers and PbO₂ coatings was characterized by scanning electronic microscopy and X-ray diffraction. The results indicated that the above oxides interlayer exited in the form of solid solution and the interlayer covered the Ti substrate largely. Accelerated life test proved that the presence of solid solution interlayer can increase the stability of PbO₂ electrodes in electrolysis. Cyclic voltammogram indicated that the PbO₂ electrode with the solid solution interlayer have more active surface area in sulfuric acid solution. Linear scanning voltammograms showed that the over potentials of the oxygen evolution are decreased with the addition of the solid solution interlayer. Electrochemical impedance spectroscopy showed that the presence of interlayer can increase the electrochemical activity of oxygen evolution reaction and electrical conductivity.