| The properties of the coated titanium anode such as the electrocatalytic activity,stability,cost,and service life are the key factors for evaluating the anode.Therefore,it is very important to explore and develop the coated titanium anode with excellent properties.Here,the IrO2 coated titanium anodes were prepared by using Nano-TiO2-Ti as the substrates.Effect of TiO2 nanostructures on the properties of IrO2 coated titanium anodes was investigated.This paper includes:1.TiO2 nanowires(TiO2 NWs)and TiO2 nanopores(TiO2 NPs)were synthesized on Ti plates by using hydrothermal and anodic oxidation method,and the Ti plate as both substrate and Ti source.Then the TiO2 NWs-Ti substrate and TiO2 NPs-Ti substrate were obtained.The preparation conditions of TiO2 NWs-Ti substrate such as the temperature,time and the concentration of NaOH solution of hydrothermal reaction were explored.The surface morphology and material composition were characterized by field emission scanning electron microscopy(FESEM)and X-ray powder diffraction(XRD).The optimum preparation conditions are as follows:Ti was soaked in 1 M NaOH solution at 220? for 30 h,then immersed in 1 M HCl for 30 min to ion exchange,and finally sintered at 450? for 2 h to obtain TiO2 NWs,which presented netlike structure and uniformly distributed on the surface of Ti.TiO2 NPs-Ti substrate was prepared step by step,and the surface morphology and structure of the products of each stage were analyzed.Results indicated that TiO2 NPs,which was even and honeycomb,must be obtained by three-step anodic oxidation.2.The properties of IrO2 coated titanium anodes prepared with Nano-TiO2-Ti as substrates were determined.Effects of the morphology of TiO2 nanostructures on the properties of IrO2 coated titanium anodes were investigated.The properties of IrO2 coated titanium anodes such as the morphology and composition,electrochemical properties as well as the accelerated life were determined to study the effects of the morphology of TiO2 nanostructures on the properties of IrO2 coated titanium anodes(compared with the performance of IrO2 coated titanium anode with Ti as the substrate).The results showed that IrO2/Nano-TiO2-Ti coated anodes had excellent stability,high electrocatalytic activity and long service life.3.By using Nano-TiO2-Ti and Ti as the substrates and H2IrCl6 which added IrO2 nanoparticles as the coated solution to prepare the IrO2 coated titanium anodes,then its properties were determined.Effect of the addition of IrO2 nanoparticles on the performance of IrO2 coated titanium anodes was studied.The surface morphology,material structure,electrochemical properties,and enhanced electrolytic lifetime of the prepared anode were measured.The results showed that the performance of IrO2/Nano-TiO2-Ti anodes was the best,which indicated that the Nano-TiO2-Ti substrate on the coated titanium anode performance was not affected by the coating solution.The performance of IrO2 coated titanium anodes,which prepared by using the coating solution which before and after addition of IrO2 nanoparticles,was compared.The experiment results showed that with the addition of IrO2 nanoparticles in the coating solution,the electrolytic life and stability were deteriorated in some degree,while the electrocatalytic activity of the prepared anode is greatly increased.The IrO2/Nano-TiO2-Ti anodes prepared by using Nano-TiO2-Ti as the substrates had excellent stability,high electrocatalytic activity and long service life.The study of IrO2/Nano-Tio2-Ti anodes with IrO2 nanoparticles had also yielded valuable results and needs further study.The method could extend to use the material of other metal substrate and prepare other metal oxide anodes. |
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