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Study on Titanium-based Metal Oxide Anode with Tantalum Interlayer Coating

Author: WuWeiLan
Tutor: HouWenTao；XuLiKun
School: Shandong University
Course: Chemical processes
Keywords: The tantalum middle layer Metal oxide anode Electrochemical properties Magnetron sputtering Thermal decomposition
CLC: TG174.41
Type: Master's thesis
Year: 2011
Downloads: 18
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Abstract


Metal oxide anode is widely used in the chlor-alkali industry, hydrometallurgy, organic synthesis, cathodic protection, electrolytic antifouling, industrial electroplating and other electrochemical engineering in its stable electrochemical performance and good electrocatalytic activity today than ideal the electrode material. In order to further improve the life and electrocatalytic activity of the anode, titanium-based metal oxide anode materials development, in this paper, we add the middle layer of tantalum prepared metal oxide anode, and the tantalum middle of the titanium-based impact the performance of metal oxide anode. The EEM, EDX, XRD, and other means of analysis of the surface morphology of the metal oxide anode composition distribution and phase structure, combined with the cyclic voltammetry (CV), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), enhanced electrolysis life test (ALT) and other means of electrochemical test analysis of the metal oxide anode electrochemical performance and stability. Of a solution of tantalum pentachloride in a pure nitrogen (≥ 99.99%) under an atmosphere of the thermal gravimetric analysis, experiments show that the tantalum pentachloride solution at 300 ℃ basic decomposition completely, thermal decomposition of the final product component comprises a single mass, tantalum portion tantalum oxide and a small amount of residual chlorine. The process of thermal decomposition method and magnetron sputtering prepared tantalum layer. The results showed that prepared by thermal decomposition of the surface of the tantalum layer exists in the form of crack-like crack the tantalum layer mainly composed of Ta, TaO2 or Ta2O5 forms exist, and with the increase in the thickness of the tantalum layer, the number of surface cracks increases; magneto control sputtered surface of the tantalum layer is based on the presence of a bulk-like morphology, surface densification, the tantalum layer mainly composed of a single mass Ta, and with the increase in the time of the deposition of the tantalum layer, the surface roughness is reduced. These two methods are compared to known dense Magnetron Sputtering tantalum layer surface crystallinity. The mechanism of thermal decomposition of the structure and properties of the prepared tantalum-containing intermediate layer Ti/Ta/IrO2-Ta2O5 electrode and electrolytic lapse. The study shows that the join of the tantalum of the intermediate layer, reduce the number of cracks of the electrode surface, to improve the oxygen evolution potential of the electrode and the strength lifetime. With the increase in tantalum middle thickness, no significant change in the oxygen evolution potential intensive electrolysis life of the electrode is decreased. Add the tantalum the middle Ti/Ta/IrO2-Ta2O5 electrode failure mechanism is the dissolution of the surface of the active component. The Magnetron Sputtering Ti/Ta/IrO2-Ta2O5 tantalum-containing intermediate layer electrode structure and performance, as well as electrolytic failure mechanism. The results show that, join the middle layer of tantalum electrode surface cracks less fine, cyclic voltammetry curves appear obvious redox peaks, the voltammetric power Q * and oxygen evolution potential significantly improve the stability of the electrode was than Ti/IrO2-Ta2O5 electrode . Failure mechanism of thermal decomposition of the tantalum-containing intermediate layer anode electrodes prepared by a tantalum-containing middle layer Ti/Ta/IrO2-Ta2O5 the same failure mechanism, main surfactant IrO2 dissolved.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Electrochemical protection
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