The Preparation And Electrochemical Catalytic Properties Research Of Ti/MnO_x Electrode Coated With The Interlayer And Element Doping

As the DSA electrode have a broad application prospect in the field of ship ballast watertreatment, the titanium oxide electrode has become an hot issue. Compared with othertitanium base metal oxide electrode, the titanium base manganese oxide electrode was givengreat expectation because of low cost, good catalytic activity, low price and simplepreparation process.In this paper, titanium base manganese oxide electrodes were perpared by anodicoxidation electrodeposition. The cyclic voltammograms, polarization curve, ac impedance aswell as SEM, XRD, EDS were employed to detect the performance of electrodes which wereprepared by adding titanium oxide layer and doping element modification. Accelerating lifeand degrading performance of electrodes were also tested to investigate the shape of electrode,the composition and structure of active layer, the activity and stability of electro-catalysiswhich were caused by different preparation technology of electrodes.The optimum technological conditions of active manganese oxide layer preparation is:0.15mol·L^-1MnS₄+0.1mol·L^-1Mn（CH₃COO）₂+0.01mol·L^-1NaF+9×10-5mol·L^-1,resorcin as electrolyte formulation, two electrode system, and the Dc current density, anodizetime were5mA·cm-2,45min respectively. As the prepared electrodes putting in phenol for60min, the degradation rate was35.77%and the accelerated life was210s.Based on the above-mentioned preparation technology, nano tube titanium based middlelayer of manganese dioxide electrodes performed the best while its accelerated life was2760s,which extended1214%compared with non-layer electrodes and this make up for the defectsof titanium base manganese oxide electrodes effectively.Through secondary electrodeposition, doping modification was introduced to titaniumbase manganese oxide electrodes in order to improve the electro-catalysis. By comparingthree different kinds of doping elements, concluded: when doping Ni element, the best saltconcentration was0.05mol·L^-1while the degradation rate was51.17%and the acceleratedlife was2972s; when doping Cu element, the best salt concentration was0.02mol·L^-1whilethe degradation rate was59.48%and the accelerated life was2411s; when doping Pb element,the best salt concentration was0.3mol·L^-1while the degradation rate was75.48%and theaccelerated life was4921s; In summary, the titanium base manganese oxide electrodes which doped Pb elementperformed best electro-catalysis and stability.