采用阳极氧化法制备小管径(20~300 nm)的TiO2纳米管已经有很多报道，但大管径的 TiO2纳米管的制备还是一个挑战.为制备大管径的 TiO2纳米管，研究了高水含量的电解液对纳米管管径的影响.结果表明，纳米管的管径随水含量的增加而增加(8％~12％(体积分数))，而水含量增加到13％(体积分数)时，无法得到规则的纳米管，进一步增加水含量到20％(体积分数)，只能得到致密的 TiO2薄膜.此外，在含有0．3％(质量分数)NH4 F 和12％(体积分数)H 2 O 的乙二醇电解液中，研究了不同氧化电压对纳米管管径的影响.结果表明，在170 V 氧化电压下制备的TiO2纳米管的管径可达到600 nm.纳米管的光解水性能测试结果表明，管径的增大有利于提高TiO2纳米管的光解水性能.
Anodization of Ti and the preparation of TiO2 nanotubes with small diameter (20-300 nm)have been reported for many times,however,the fabrication of TiO2 nanotubes with large diameter was still a challenge. In order to fabricate TiO2 nanotube with large diameter,the influence of water content contained in electrolyte on the diameter of TiO2 nanotubes has been investigated in detail.The results show that nanotube diameter in-creases significantly with the increase of water content (from 8% to 12 vol%).However,when the water con-tent increases to 1 3 vol%,the self-ordered nanotubes cannot be obtained by anodization.Further increasing the water content to 20vol%,the compact titanium oxide film can be obtained.Besides,the investigation of voltage affect on the diameter of TiO2 nanotube was carried out in ethylene glycol electrolyte containing 0.3wt% NH4 F and 12vol% H2 O.The results indicate that the largest diameter (about 600 nm)can be obtained at a voltage of 170 V,which has never been reported in the literature.The measurements of photoelectrochemical (PEC)water splitting of the TiO2 nanotubes show that the increase of the nanotubes’diameter was beneficial to their PEC water splitting performance.
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