TiO2纳米管的制备及光电催化分解海水制氢

采用阳极氧化法在钛板表面制备了垂直导向的TiO2纳米管阵列。研究了无机无氟(HCl+H2O2)、无机含氟(HF)和有机乙二醇(EG)三种体系对TiO2纳米管薄膜制备的影响。利用SEM对其形貌进行了表征,通过电化学考察了其光电响应性能。考察了制备的TiO2纳米管薄膜光电催化分解海水制氢性能。结果表明:在EG体系中制备的TiO2纳米管阵列规则有序,有利于光生电子的传输,减小了电子一空穴对的复合,光电催化制氢活性最高。

Preparation of TiO[sub_s]2[sub_e]nanotube arrays and its photoelectrochemical properties of splitting seawater into hydrogen

TiO2 nanotube arrays perpendicular to the substrate were fabricated by anodic oxidation in three different electrolytes: fluoride-free inorganic(HCl H2O2), fluoride-inorganic(HF) and fluoride-organic(EG). The influences of electrolytes on the formation of the tubes were investigated. The morphology of the as-fabricated samples was studied with SEM. The TiO2-NTs were used as photoanodes to photoelectrochemically split artificial seawater into hydrogen. The results show that TiO2-NTs obtained in EG electrolytes have a higher hydrogen evolution activity because of relatively better surface smoothness and tube orderliness, which are benefit for electro-hole pairs transporting and reducing recombination between them.