IrO2 Decorated Self-Doped TiO2 Nanotube Arrays: A Binder-Free and More Stable Electrode for Oxygen Evolution Reaction in Acid Condition

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

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A general approach to the fabrication of Sn-doped TiO2 nanotube arrays with titanium vacancies for supercapacitors

Applied Surface Science ◽

10.1016/j.apsusc.2021.151175 ◽

2021 ◽

pp. 151175

Author(s):

Qianqian Liu ◽

Yan Yang ◽

Yilin Ni ◽

Qi Wang ◽

Huiwen Yu ◽

...

Keyword(s):

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Nanotube Arrays ◽

Doped Tio2

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Novel K-doped TiO2 nanotube arrays with superhydrophilic surface and high photoelectrochemical cathodic protection

Applied Surface Science ◽

10.1016/j.apsusc.2021.152274 ◽

2021 ◽

pp. 152274

Author(s):

Zheng Ma ◽

Xiumin Ma ◽

Lihui Yang ◽

Xuehui Liu ◽

Zhenyu Zhong ◽

...

Keyword(s):

Cathodic Protection ◽

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Nanotube Arrays ◽

Doped Tio2 ◽

Superhydrophilic Surface

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Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries

Nanomaterials ◽

10.3390/nano11112924 ◽

2021 ◽

Vol 11 (11) ◽

pp. 2924

Author(s):

Suriyakumar Dasarathan ◽

Mukarram Ali ◽

Tai-Jong Jung ◽

Junghwan Sung ◽

Yoon-Cheol Ha ◽

...

Keyword(s):

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Electrochemical Anodization ◽

Nanotube Arrays ◽

Kinetic Properties ◽

Outer Diameter ◽

Impregnation Method ◽

Binder Free ◽

Vertically Aligned ◽

Discharge Capacities

Vertically aligned Fe, S, and Fe-S doped anatase TiO2 nanotube arrays are prepared by an electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, highly ordered TiO2 nanotube layers with greater thickness of 12 μm, inner diameter of approx. 90 nm and outer diameter of approx. 170 nm are successfully obtained. Doping of Fe, S, and Fe-S via simple wet impregnation method substituted Ti and O sites with Fe and S, which leads to enhance the rate performance at high discharge C-rates. Discharge capacities of TiO2 tubes increased from 0.13 mAh cm−2(bare) to 0.28 mAh cm−2 for Fe-S doped TiO2 at 0.5 C after 100 cycles with exceptional capacity retention of 85 % after 100 cycles. Owing to the enhancement of thermodynamic and kinetic properties by doping of Fe-S, Li-diffusion increased resulting in remarkable discharge capacities of 0.27 mAh cm−2 and 0.16 mAh cm−2 at 10 C, and 30 C, respectively.

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