【摘 要】
：
在质量分数为1.0%的HF溶液中,对纯钛片进行阳极氧化,获得了TiO2纳米管(TNTs)阵列。采用扫描电镜和X射线衍射表征了TNTs阵列的表面形貌及晶型结构。在450°C下热处理可以使TNT
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在质量分数为1.0%的HF溶液中,对纯钛片进行阳极氧化,获得了TiO2纳米管(TNTs)阵列。采用扫描电镜和X射线衍射表征了TNTs阵列的表面形貌及晶型结构。在450°C下热处理可以使TNTs由无定形态转化为锐钛矿型。将热处理后的TNTs阵列置于1.5 mol/L的(NH4)2SO4电解液中进行电化学还原,制备了Ti3+掺杂的TNTs阵列。利用电化学阻抗谱研究了掺杂时间对纳米管阻抗的影响。X射线光电子能谱显示,在-1.45 V(相对于饱和甘汞电极)下经过60 s电化学还原自掺杂,可以使TNTs表面42.19%的Ti4+转化为Ti3+,从而有效降低了晶型转变后TNTs的阻抗。
In the mass fraction of 1.0% HF solution, the pure titanium plate was anodized to obtain an array of TiO2 nanotubes (TNTs). The surface morphology and crystal structure of TNTs arrays were characterized by scanning electron microscopy and X-ray diffraction. Heat treatment at 450 ° C can transform TNTs from amorphous to anatase. The heat-treated TNTs arrays were electrochemically reduced in 1.5 mol / L (NH4) 2SO4 electrolyte to prepare Ti3 + -doped TNTs arrays. The influence of doping time on the impedance of nanotubes was investigated by electrochemical impedance spectroscopy. X-ray photoelectron spectroscopy showed that 42.4% of Ti4 + on the surface of TNTs was converted to Ti3 + after 60 s electrochemical reduction and self-doping at -1.45 V (relative to saturated calomel electrode) for 60 s, which effectively reduced the crystal structure Impedance of TNTs.
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