Study On Improving Of Carbon Nanotubes On The Performance Of TI-Bbased Metal Oxide Anode

Titanium anodes with different metal oxide coatings are electrodes coated with Ti-based metal oxide. They have the advantages of high catalytic activity and good stability. In the seawater electrolysis antifouling engineering, the common anodes have low chlorine activity, short fortifying life and easy to make system downtime, which can’t meet the requirement of maintenance free in practical engineering. Compared to other nano-materials, One-dimensional carbon nano-materials have high electrical conductivity, electron transport rate, large specific surface area and low cost, so they are widely used in the material science field, such as electrode modification, composite materials. Therefore, the purpose of this study is to improve the chlorine activity and the stability of anode in the process of seawater electrolysis through doping carbon nano-tubes in Ti-based metal oxide anode.In this paper, the Ti/Ru-Ir-Sn oxide anodes with carbon nano-tubes were prepared with thermal decomposition method. The micro-structure, the composition and the phase of the anode coatings were studied by means of field emission scanning electron microscope (FESEM), energy dispersive spectrometer (EDS) arid X-ray diffraction (XRD). The chlorine electro catalytic activity and the durability of ruthenium oxide anode under the condition of the seawater chlorine evolution reaction were studied by means of polarization curves, cyclic voltammorgrams test, electrochemical impedance spectroscopy and fortifying life test. Some practical results have been got as follows.1) The experimental carbon nano-tubes were tested by the method of thermal analysis. The results showed that carbon nano-tubes don’t produce high temperature oxidation decomposition under the sintering temperature of 470V, and they still exist as elemental in the anode coatings.2) The effect of the amount of doped carbon nano-tubes on the microstructure of anodes was studied. The results indicated that the surface of Ti/Ru-Ir-Sn oxide anodes with different content of carbon nano-tubes presents typical "crack" appearance. The carbon nano-tubes increase the active ingredient content of coating, but don’t change the structure of (Ru-Ir-Sn)O2 solid solution.3) The addition of carbon nano-tubes could significantly improve the electrochemical performance of Ti/Ru-Ir-Sn oxide anode. The study showed that the active surface area of anodes increases four times, the chlorine electro catalytic activity is promoted, the fortifying life is extended three times, and the stability of anode is improved. The addition of 0.1 g-L"1 carbon nano-tubes in Ti/Ru-Ir-Sn oxide anodes has the best anode electric catalytic activity and stability.4) The effect of the dispersing technique of carbon nano-tubes, such as ultrasonic treatment and acidification treatment, on the electrochemical performance of Ti/Ru-Ir-Sn oxide anodes was investigated. The study showed that, compared with single ultrasonic dispersing technique, carbon nano-tubes could disperse more uniformly by using ultrasonic and acidified compound dispersing technique. Ti/Ru-Ir-Sn oxide anodes prepared with ultrasonic and acidified compound dispersing technique has a smaller capacitive reactance arc radius, its internal resistance is reduced, its electronic exchange capacity per unit time is the largest, and fortifying life is extended further.