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℃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.
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