Investigation On Preparation And Electrochemical Behavior Of TiO₂/Ti Electrode By Doping Platinum

Pt-TiO₂/Ti electrode was prepared by two-steps of anodic oxidation followed by cathodic electrodeposition. The microstructure and electrocatalytic performance of the electrode were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), linear potential sweep (LPS) and cyclic voltammetry (CV). The research results indicated that nanoscale platinum particles were homogeneously dispersed on the surface of TiO₂ nanotubes and the electrode exhibited typical electrochemical properties of platinum and well electrocatalytic performance.The electrocatalytic properties of methanol on Pt-TiO₂/Ti electrode were investigated by cyclic voltammetry. The research results indicated that the electrocatalytic reactivity of methanol on Pt-TiO₂/Ti electrode was improved with increasing deposition time of platinum, and heat treatment significantly improved the electrocatalytic performance of Pt-TiO₂/Ti electrode. with increasing scans of cyclic voltammtry, the peak current of phenol oxidation increased.Simulative phenol wastewater was electro-degraded in a electrobath with no dissepiment using Pt-TiO₂/Ti composite electrode as anode and stainless steel plate as cathode. The factors such as initial phenol concentration, pH, electrolyte concentration and reaction temperature were investigated. The removal rate of phenol decreased as increase of initial phenol concentration. There is an optimum electrolyte concentration of 0.2 mol/L in the experiment. The stronger acidic condition and higher temperature, the better phenol removal rate were achieved.The electrocatalytic activity of phenol on Pt-TiO₂/Ti electrode was also investigated by cyclic voltammetry and linear potential sweep. It was demonstrated that the oxidation of phenol on Pt-TiO₂/Ti electrode involves both direct and indirect anodic oxidation process, which was mainly controlled by diffusion process. The phenol oxidation is an irreversible process, including diffusion, adsorption and chemical transformation process. The scanning rate, phenol concentration, pH value and reaction temperature may have certain effect on the overpotential of oxygen evolution and oxidation potential of phenol on Pt-TiO₂/Ti electrode, which couldn't change the electrochemical oxidation properties of phenol on Pt-TiO₂/Ti electrode.