(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 在0.5%(質(zhì)量分?jǐn)?shù))NH4F/甘油電解液中通過恒壓陽極氧化法在鈦基體上制備TiO2納米管陣列。采用循環(huán)伏安法、紫外−可見吸收光譜、順磁共振波譜儀和傅立葉紅外譜對(duì)TiO2納米管陣列的表面性能進(jìn)行了表征。結(jié)果表明：TiO2納米管陣列電極可發(fā)生兩個(gè)光化學(xué)過程，測(cè)得的電化學(xué)激發(fā)能∆EOH/•OH＞1.643 V，對(duì)應(yīng)的吸收光波長(zhǎng) λ＜853 nm；TiO2納米管陣列電極光化學(xué)性能變化是由于在電極表面發(fā)生Ti3+與Ti4+轉(zhuǎn)化的過程中形成了·OH。
關(guān)鍵字: TiO2納米管陣列電極；陽極氧化；循環(huán)伏安法
anodic oxidation on titanium substrate
（College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract: The self-organized TiO2 nanotube arrays were prepared in 0.5% (mass fraction) NH4F/glycerol by method of anodic oxidation of a pure titanium sheet at a constant potential. The electrodes of TiO2 nanotube arrays were characterized by means of cyclic voltammetry (CV), FTIR, SEM, electron paramagnetic resonance spectrometer (EPR) and UV-vis spectroscopy measurement. The results show that two photoelectrochemical processes can be observed in the TiO2 nanotube arrays electrode. The minimum electrochemical excitation energy of TiO2 electrodes calculated is ∆EOH/·OH＞1.643 V, the corresponding excitation irradiance wavelength λ＜853 nm. Based on the experiment, the mechanism was proposed on the base of these two photoelectrochemical processes. The results show that the changes of photoelectrochemical properties are related with the appearance of surface free hydroxyl when titanium ion produces on the film.
Key words: TiO2 nanotube arrays electrodes; anodic oxidation; cyclic voltammetry (CV)
