Preparation, Characterization And Performance Of Ti-based Anodes For Oxygen Evolution

The higher anodic overpotential for oxygen evolution is the main reason of the lower water electrolysis efficiency, thus reducing the oxygen evolution potential, R & D performance of the electrode materials has currently become an urgent need to resolve for the field of water electrolysis.This paper focused on the preparation, characterization and properties of Ti-based electrodes doped by non-noble and rare earth metals. Taking the Ptblack as pair electrode, the Ag/AgCl as the reference electrode, and KOH solution as electrolyte, the electrode was tested by many methods of electrochemical analysis such as LSV, CV and OP. The electrode characterization was tested by means of XRD, SEM and so on.The results indicated that: (1)The optimal temperature and the proportion of doping amount of Ti/Ru_0.3Co_0.7-xCe_xO₂ (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) electrodes were 400℃and 0.3:0.3:0.4. (2) The anode coatings obtained by thermal decomposition and sol-gel process were studied, results showed that the preparation method had a striking effect on the characteristics of the coatings. The Ti/RuSnCe anode coating prepared by sol-gel process had much better synthetic properties than the one prepared by the traditional thermal decompo- sition. It had lower overpotential and potential for oxygen evolution and longer accelerated lifetime which were 327mV(vs.Ag/AgCl), 1.381V, and 16.5h respectively.(3) The optimal temperature and the proportion of doping amount of Ti/Ru_0.3Sn_0.7-xCe_xO₂ (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7) electrodes were 400℃and 0.3:0.4:0.3. (4)SEM showed that the interlayer fully covered on Ti base and the layer had a large specific surface area. This kind of interlayer enhanced the electrocatalytic ability and the service life of electrodes. (5)XRD showed that doping of rare earth was in favor of grain refining, which could increase the specific surface area of the coating and help to enhance the electrical conductivity and electro-catalytic ability of electrodes.The research and the development of the new type of oxygen electrode materials of this paper, not only for water electrolysis, but also for chlor-alkali industry, corrosion and anodic protection, development and using of photo-electrochemical, the chemical power supply as well as the fuel cell are of great significance.