Preparation and Electrocatalytic Properties of Metal Oxide-coated Titanium Anodes Used in Low-temperature Seawater†

doi:10.7503/cjcu20150795

Abstract

Abstract:

Ti/(Ti-Ta_x)O₂/IrO₂ anodes with middle coating were made by thermal decomposition at different temperatures, while the middle coating was made from a mixture of TaCl₅-butanol saturated solution with TiN nano-powder. Compared with the traditional Ti/IrO₂ anodes, these new anodes were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM), and studied by electrochemical measurements such as polarization curve, cyclic voltammetry and acce-lerated life test. The results revealed that for Ti/(Ti-Ta_x)O₂/IrO₂ anodes calcinated at 400 ℃, the addition of middle coating acquired a much better IrO₂ crystallization at the surface and a cracked-mud morphology which was usually obtained at high temperature. Furthermore, compared with the anode calcinated at 500 ℃, the electrocatalytic activity of the anode prepared at 400 ℃ was highly raised, its electrochemical active area was increased by 6 times, and the working potential was decreased by 100 mV(to 1.37 V) at a current density of 100 mA/cm² in 4 ℃ seawater. Meanwhile, the accelerated life was increased by 10 times, compared with the Ti/IrO₂ anode prepared by traditional method. Therefore, the newly developed anodes are suitable to be used in low-temperature seawater with good electrocatalytic property and stability.

Key words: Ship’s ballast water, Electrolysis of seawater, Metal oxide-coated titanium anode, Titanium nitride, Iridium oxide

CLC Number:

O646

TrendMD:

WANG Rui, WANG Tingyong, XU Haibo. Preparation and Electrocatalytic Properties of Metal Oxide-coated Titanium Anodes Used in Low-temperature Seawater^†[J]. Chem. J. Chinese Universities, 2016, 37(4): 701.

Figures/Tables 6

Fig.1 XRD patterns of Ti/IrO2 and Ti/(Ti-Tax)O2/IrO2 electrodes calcined at 400 and 500 ℃

Fig.2 SEM images of Ir5-400(A), M2Ir3-400(B), Ir5-500(C) and M2Ir3-500(D)

Fig.3 Cyclic voltammetry curves of Ti/IrO2 and Ti/(Ti-Tax)O2/IrO2 electrodes in seawater at 14 ℃

Fig.4 Polarization curves of Ti/(Ti-Tax)O2/IrO2 electrodes M2Ir3-400(A) and M2Ir3-500(B) in saturated NaCl solution at temperatures of 4, 14 and 30 ℃

Fig.5 Polarization curves of Ti/(Ti-Tax)O2/IrO2 electrodes calcinated at 400 ℃(a) and 500 ℃(b) in seawater at temperatures of 4 ℃(A), 14 ℃(B) and 30 ℃(C)

Fig.6 Variations of voltage with operation time for Ti/IrO2 calcinated at 400 ℃(a) and 500 ℃(b), and Ti/(Ti-Tax)O2/IrO2 calcinated at 400 ℃(c) and 500 ℃(d)

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