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采用阳极氧化法在乙二醇电解液中制备了高度有序的TiO2纳米管阵列,分别通过SEM、EDX表征其形貌及元素组成,并探讨了TiO2纳米管的生长过程。结果表明,TiO2纳米管的形成过程是一个由纳米多孔膜结构向独立有序的纳米管阵列转变的过程。同时以TiO2纳米管为光阳极,采用双室光电化学池制氢体系,利用光照TiO2产生的光电压与双室电解液pH差产生的化学偏压的协同效应可达到水的分解电压,充分实现高效率、低能耗制氢的目标。无外加电压及牺牲剂条件下,TiO2纳米管的光电流密度为6.51 m A/cm2,光照1 h产氢量高达108.9μmol/cm2。
Highly ordered TiO2 nanotube arrays were prepared by anodic oxidation in ethylene glycol electrolyte. The morphology and elemental composition of TiO2 nanotubes were characterized by SEM and EDX respectively. The growth of TiO2 nanotubes was also discussed. The results show that the formation of TiO2 nanotubes is a transition from nanoporous membrane structure to independently ordered nanotube array. At the same time, TiO2 nanotube is used as photoanode, and the synergistic effect of the chemical bias generated by the photo-voltage generated by photocatalysis TiO2 and the pH difference of the dual-chamber electrolyte can reach the decomposition voltage of water by adopting the dual-chamber photoelectrochemical cell hydrogen production system, and fully realize High efficiency, low energy consumption of hydrogen target. The photocurrent density of TiO2 nanotubes was 6.51 m A / cm2 without voltage and sacrificial agent, and reached as high as 108.9 μmol / cm2 in 1 h.