A flexible lead-free piezoelectric nanogenerator based on vertically aligned BaTiO3 nanotube arrays on a Ti-mesh substrate

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 81426-81435 ◽  
Author(s):  
Ermias Libnedengel Tsege ◽  
Gyu Han Kim ◽  
Venkateswarlu Annapureddy ◽  
Beomkeun Kim ◽  
Hyung-Kook Kim ◽  
...  
Keyword(s):  
Low Temperature ◽  
Titanium Oxide ◽  
Hydrothermal Process ◽  
Lead Free ◽  
Nanotube Arrays ◽  
Titanium Oxide Nanotubes ◽  
Vertically Aligned ◽  
Ti Mesh

A novel, flexible lead-free piezoelectric nanogenerator was developed using a uniform BaTiO3 film; synthesized by in situ conversion of titanium oxide nanotubes in a low temperature hydrothermal process.

scholarly journals Electrochemical Anodization and Characterization of Titanium Oxide Nanotubes for Photo Electrochemical Cells

2021 ◽  
Vol 2070 (1) ◽  
pp. 012073
Author(s):  
C U Bhadra ◽  
D Henry Raja ◽  
D Jonas Davidson
Keyword(s):  
Titanium Oxide ◽  
Oxygen Vacancies ◽  
Ammonium Fluoride ◽  
Band Gap Energy ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Photoluminescence Intensity ◽  
Titania Nanotube Arrays ◽  
Titanium Oxide Nanotubes ◽  
Inner Diameter

Abstract Due to its multitude of applications, titanium oxide is one of the most coveted and most sought-after materials. The above experiment demonstrated that TiO2 nanotube arrays might be formed by electrochemical anodization of titanium foil. The 0.25 wt% ammonium fluoride (NH4F) was added to a solution of 99% ethylene glycol. Anodization is carried out at a constant DC voltage of 12V for 1 hour. Then, the annealing process is carried out for 1 hour at 4800C, which is known as an annealing. FE-SEM were utilized to evaluate the surface morphology of the nanotube arrays that were made. At the wavelength of 405 nm, sharply peaked photoluminescence intensity was observed, which corresponded tothe band gap energy (3.2 eV) of the anatase TiO2 phase. Since free excitations appear at 391 and 496 nm, and since oxygen vacancies are developed on the surface of titania nanotube arrays, it is reasonable to conclude that free excitations and oxygen vacancies are the causes of humps at 391 and 496 nm, and that they may also be present at 412 and 450 nm. FESEM results showed uniformly aligned TiO2 nanotube arrays with an inner diameter of 100 nm and a wall thickness of 50 nm

In Situ Grown Monolithic Au/TiO 2 Catalysts on Flexible Ti Mesh for Efficient Low‐Temperature CO Oxidation

2020 ◽  
Vol 5 (7) ◽  
pp. 2000115 ◽  
Author(s):  
Ke Wang ◽  
Xiaoyuan Liu ◽  
Xinyue Tang ◽  
Xin Jin ◽  
Wenjin Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Low Temperature Co Oxidation ◽  
Ti Mesh

Graphitic carbon nitride (g-C3N4) coated titanium oxide nanotube arrays with enhanced photo-electrochemical performance

2016 ◽  
Vol 45 (32) ◽  
pp. 12702-12709 ◽  
Author(s):  
Mingxuan Sun ◽  
Yalin Fang ◽  
Yuanyuan Kong ◽  
Shanfu Sun ◽  
Zhishui Yu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Titanium Oxide ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Nanotube Arrays

In situ growth of g-C3N4 on the surface of TiO2 nanotube arrays (g-C3N4/TiO2) was achieved via the vapor-pyrolysis of melamine and a better photo-electrochemical performance was demonstrated.

Titanium oxide nanotube arrays prepared by anodic oxidation

2001 ◽  
Vol 16 (12) ◽  
pp. 3331-3334 ◽  
Author(s):  
Dawei Gong ◽  
Craig A. Grimes ◽  
Oomman K. Varghese ◽  
Wenchong Hu ◽  
R. S. Singh ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Anodic Oxidation ◽  
Hydrofluoric Acid ◽  
Layer Structure ◽  
Porous Alumina ◽  
Pure Titanium ◽  
Nanotube Arrays ◽  
Titanium Sheet ◽  
Anodization Time ◽  
Titanium Oxide Nanotubes

Titanium oxide nanotubes were fabricated by anodic oxidation of a pure titanium sheet in an aqueous solution containing 0.5 to 3.5 wt% hydrofluoric acid. These tubes are well aligned and organized into high-density uniform arrays. While the tops of the tubes are open, the bottoms of the tubes are closed, forming a barrier layer structure similar to that of porous alumina. The average tube diameter, ranging in size from 25 to 65 nm, was found to increase with increasing anodizing voltage, while the length of the tube was found independent of anodization time. A possible growth mechanism is presented.

scholarly journals Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 298 ◽  
Author(s):  
SK Hossain ◽  
Junaid Saleem ◽  
SleemUr Rahman ◽  
Syed Zaidi ◽  
Gordon McKay ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Titanium Oxide ◽  
Hydrothermal Process ◽  
Gas Diffusion ◽  
Solid Polymer ◽  
Precipitation Method ◽  
Cathode Side ◽  
Faradaic Efficiency ◽  
Support Materials ◽  
Titanium Oxide Nanotubes

Carbon dioxide (CO2) is considered as the prime reason for the global warming effect and one of the useful ways to transform it into an array of valuable products is through electrochemical reduction of CO2 (ERC). This process requires an efficient electrocatalyst with high faradaic efficiency at low overpotential and enhanced reaction rate. Herein, we report an innovative way of reducing CO2 using copper-metal supported on titanium oxide nanotubes (TNT) electrocatalysts. The TNT support material was synthesized using alkaline hydrothermal process with Degussa (P-25) as a starting material. Copper nanoparticles were anchored on the TNT by homogeneous deposition-precipitation method (HDP) with urea as precipitating agent. The prepared catalysts were tested in a home-made H-cell with 0.5 M NaHCO3 aqueous solution in order to examine their activity for ERC and the optimum copper loading. Continuous gas-phase ERC was carried out in a solid polymer electrolyte (SPE) reactor. The 10% Cu/TNT catalysts were employed in the gas diffusion layer (GDL) on the cathode side with Pt-Ru/C on the anode side. Faradaic efficiencies for the three major products namely methanol, methane, and CO were found to be 4%, 3%, and 10%, respectively at −2.5 V with an overall current density of 120 mA/cm2. The addition of TNT significantly increased the catalytic activity of electrocatalyst for ERC. It is mainly attributed to their better stability towards oxidation, increased CO2 adsorption capacity and stabilization of the reaction intermediate, layered titanates, and larger surface area (400 m2/g) as compared with other support materials. Considering the low cost of TNT, it is anticipated that TNT support electrocatalyst for ECR will gain popularity.

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