Ti/SnO2-Sb2O5-RuO2/α-PbO2/β-PbO2 electrodes for pollutants degradation

The SnO2-Sb2O5-RuO2, alpha-PbO2 and beta-PbO2 films were successfully deposited on Ti nets using thermal deposition and electrodeposition methods. It was found that the SnO2-Sb2O5-RuO2 interlayer played a very important role in enhancing the PbO2 films electrodeposition. The Ti/SnO2-Sb2O5-RuO2/alpha-PbO2/beta-PbO2 electrodes obtained were superior not only in electrochemical stability but also in activity for pollutants degradation. The lifetime reached 59 h under the accelerated life test conditions at a current density of 4 A/cm(2) in 0.5 M H2SO4 solution. The COD removal and average current efficiencies were about 94% and 53% for degrading 500 mg/L phenol at a current density of 100 A/m(2), and about 82% and 25% for degrading 1 mM 4-chlorophenol at 200 A/m(2). (C) 2011 Elsevier B.V. All rights reserved.