Improved growth rate of anodized TiO_2 nanotube arrays under reduced pressure field and light illumi

• 作 者: Shuyao Huo Zhen Xu Min Yin Dongliang Yu Xiaoyuan Chen Hui Wang Li Tiana Dongdong Li
• 机 构: Shanghai Advanced Research Institute,Chinese Academy of Sciences,University of Chinese Academy of Sc
• 出 处: Science Bulletin
• 发表日期: 2017年05期
• 关键词: nanotube illumination elongated electrolyte pumping elongation restrain attribut

The one-dimensional titanium oxide(TiO_2) nanotubes(TONT) can be rationally fabricated in the fluoridecontaining electrolyte by electrochemical anodization. The high-speed growth of TONT for elongated nanotubes is highly desirable because the undesirable chemical etching will induce ‘‘nanograss" on the top of nanotubes and restrain the continued elongation of nanotubes. Herein, the external fields were employed to accelerate the growth of TONTs and obtain the elongated TONT arrays. A growth rate up to 18 lm/h was achieved under the presence of reduced pressure(0.07 MPa) and UV light(365 nm) stimulation. The generation of longer nanotube arrays could be attributed to the applied fields, which facilitate timely gas pumping out and induce chemical equilibrium shift forward. The TONT films obtained under different parameters were subsequently employed as anodes for photoelectrochemical(PEC) water splitting. The photocurrent(at 0 V vs Ag/Ag Cl) of TONT electrode obtained under external fields represented a 50% enhancement compared with the photoanode produced by the conventional method.

The one-dimensional titanium oxide (TiO 2) nanotubes (TONT) can be rationally fabricated in the fluoridecontaining electrolyte by electrochemical anodization. The high-speed growth of TONT for elongated nanotubes is highly desirable because the undesired chemical etching will induce ’nanograss’ on the top of nanotubes and restrain the continued elongation of nanotubes. Herein, the external fields were employed to accelerate the growth of TONTs and obtain the elongated TONT arrays. A growth rate up to 18 lm / h was achieved under the presence of reduced pressure The generation of longer nanotube arrays could be attributed to the applied fields, which facilitate timely gas pumping out and induce chemical equilibrium shift forward. The TONT films obtained under different parameters were successively employed (0.07 MPa) and UV light as photocurrent (at 0 V vs Ag / Ag Cl) of TONT electrode obtained under external fields represented a 50% enhancement compared with the photoanode produced by the conventional method.