一维TiO_2纳米阵列的水热晶化及性能研究

Hydrothermal crystallization and electrochemical properties of one-dimensional TiO_2 nanotube arrays

文章采用电化学阳极氧化法以纯钛薄片为阳极,惰性电极石墨为阴极,以含0.4 mol/L HF的乙二醇溶液为电解液,在恒定的电压（100 V）下制备了TiO2纳米阵列,并分别通过水热法和高温退火对纳米阵列进行晶化处理;利用XRD、SEM、TEM、紫外-可见光分光光度计（UV-Vis）对纳米阵列的组织结构、形貌及光吸收性能进行了表征。在该体系下,制备出的TiO2纳米管阵列直径为120~140 nm,管壁厚为15~25 nm,长度为30~40μm。经过不同温度的水热处理或高温退火处理,均可得到锐钛矿相的TiO2晶体。通过电化学综合测试系统测定了晶化后的TiO2纳米阵列的线性伏安曲线,为提高光电催化效率做了理论分析。

TiO2 nanotube arrays were prepared isobarically at 100 V by anodic oxidation in ethylene glycol electrolyte containing 0.4 mol/L HF,taking the pure Ti foil as anode and inert graphite as cathode.And then they were crystallized by hydrothermal method and high temperature annealing at different temperatures.The structure,morphology and light absorption properties of the TiO2 nanotube arrays were measured by XRD,SEM,TEM,and UV-Vis spectrometer.The TiO2 nanotube arrays with a diameter of 120-140 nm,a tube-wall thickness of 15-25 nm,and a length of 30-40 μm were obtained in this system.Nano-crystalline anatase was formed after the hydrothermal treatment and high temperature annealing at different temperatures.Linear volt-ampere curves of the TiO2 nanotube arrays after crystallization were obtained using the electrochemical test system,and the theoretical analysis for enhancing the photoelectrocatalytic efficiency was carried out.