Research On Preparation And Electrochemical Property Of Anode Coating For Chlorine And Oxygen Evolution Reaction

Electrodes in electrolysis industry account for a high important position. The electrochemical reaction of electrolytic processes arise the interface of electrode surface and electrolyte. The invention of oxide electrode promotes the development of anode material rapidly. The Ru-Ti-Ir/Ti oxides anodes are widely researched and application due to its excellent electrochemical activity and stability.This experiment mainly study the effect of the service life and electrochemical activity of anode coating by acid time、interface layer and metal elements added. Comparative study of the relation between the addition of Sn、Co、Pt、Ce elements and the activity center of electrode surface. Researches show that:(1) After2h acid treatment, there is tend to uniformity of active point distribution、size and morphology in the surface of anode.(2) The thickness of middle layer had a great influence on the service life of the anode. The best coating account is0.6g/m2.(3) The tiny particle size of platinum metal oxides can effectively increase the number of coating active center.(4) Sn and Ce elements can refine the cracks on the surface of anode coating and enhance the service life.Meanwhile, paper optimized the preparation technology of anode doped with Ce and Co elements, including component ratio、drying and calcination temperature. The construction surface morphology and electrochemical property of as-prepared anode was characterized by SEM、XED、CV、EIS、AST. When the mole ratio is1:3(Ce: Co), the anodic coatings has best electrocatalytic properties and service life. Solvent can totally volatilized in10minutes when drying temperature over130℃, the life of anode can be excellent. Part of the anatase TiO2into rutile structure when the calcination temperature over500℃. The anode solid solution which formed Co3O4and other oxides can increase the service life of2times.Finally, the deactivation mechanism of oxide anodes with Ce、Co was preliminary discussed. According to the images of SEM、XRD and EIS, the main reason of anodes deactivation in the process of electrolysis was:(1) Compared the XRD images of before and after AST, the diffraction peak of Ir and Ru is weak due to dissolve in the process of electrolysis. SEM images showed activity coating peeling phenomenon in large area, even reveal the titanium anode substrate.(2) A part of oxygen adsorbed on the electrode surface, in the process of electrolysis, which generate non-conductive oxide film(TiO2) with the substrate. These simultaneously reactions led to the inactivation of anode eventually.