Hydrogen Generation from CDS Modified-Titania Nanotube Arrays

2012 ◽  
Vol 463-464 ◽  
pp. 743-747
Author(s):  
Ygin Chieh Chen ◽  
Jia You Liou ◽  
Wen Jie Lan ◽  
Jyun Yu Chen ◽  
Hong Wen Wang
Keyword(s):  
Catalytic Effect ◽  
Hydrogen Generation ◽  
Nano Particles ◽  
Nanotube Arrays ◽  
Heterogeneous Structure ◽  
Electron Hole ◽  
Titania Nanotube Arrays ◽  
Structures And Properties ◽  
Uv Visible ◽  
Photo Electrode

A heterogeneous structured photo electrode using CDS -modified TiO2nanotube arrays (TNA) was fabricated. The CDS nano particles were precipitated by immersing TNA into NaS and Cd (ClO4)2solution, where the number of immersion gave different amount of CDS precipitates. The effect of CDS on the performance of photochemical cell of TNA was evaluated. FESEM, EDS, XRD and UV-Visible were employed to characterize the structures and properties of CDS -modified TNA heterogeneous structure. The water splitting experiments were carried out using these CDS -modified TNA under standard AM 1.5 solar illumination (100mW/cm2>). An optimum hydrogen generation rate of 20.61μmole/cm2>)h (~0.50 ml/cm2>)h) was obtained. It was considered that the smaller band gap of CDS rendered the electrons a rapid transportation to the TiO2nanotube arrays and the recombination of electron-hole was therefore effectively prevented. In summary, the CDS nano particles were effective in promoting the catalytic effect of TNA for hydrogen production.

Hydrogen Generation and Pollution Degradation from Wastewater Using TiO2–CuO Nanocomposite

2020 ◽  
Vol 20 (9) ◽  
pp. 5970-5975
Author(s):  
Hassan Koohestani ◽  
Amirabbas Kheilnejad
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Generation ◽  
Uv Light ◽  
Nano Particles ◽  
Methyl Red ◽  
Cyanide Ion ◽  
Electron Hole ◽  
Production Of Hydrogen ◽  
Red Dye ◽  
Photocatalytic Processes

Simultaneous production of hydrogen and degradation of cyanide ion and methyl red dye were successfully accomplished by employing nano-particles of TiO2–CuO under the radiation of UV light. Exploiting composites improves the electron–hole separation and consequently optimizes photocatalytic processes. Furthermore, the simultaneity of several photocatalytic processes decreases the rate of electron–hole recombination. According to the results, more hydrogen was produced in lower pHs. Up to the initial concentration of 0.3 and 0.8 mol/L for methyl red and cyanide ion respectively, the presence of pollutants increased hydrogen production remarkably, while in more concentrations, hydrogen production was independent of concentrations. The rate of hydrogen production decreased with the pass of time which is due to the consumption of holes by pollutants’ molecules, and the effective participation of the electrons in hydrogen production. Accordingly, after 210 min, the amounts of cyanide ion and methyl red declined and the hydrogen production rate decreased from from 17–22 μmol H2/min to 2–3 μmol H2/min.

Effect of Anodization Bath Chemistry on Photochemical Water Splitting Using Titania Nanotubes

2004 ◽  
Vol 836 ◽  
Author(s):  
Gopal K. Mor ◽  
Oomman K. Varghese ◽  
Maggie Paulose ◽  
Karthik Shankar ◽  
Craig A. Grimes
Keyword(s):  
Water Splitting ◽  
Wall Thickness ◽  
Pore Diameter ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Photoelectrochemical Cell ◽  
Nanotube Arrays ◽  
Titania Nanotube Arrays ◽  
Variable Wall Thickness ◽  
Variable Wall

ABSTRACTIn this study highly-ordered titania nanotube arrays of variable wall-thickness and length are used to photocleave water under ultraviolet irradiation. We demonstrate that the wall thickness, and length, of the nanotubes can be controlled via anodization bath composition and temperature. The nanotube length and wall thickness are key parameters influencing the magnitude of the photoanodic response and the overall efficiency of the water-splitting reaction. For 22 nm inner-pore diameter nanotube-arrays 6 μm in length, with 9 nm wall thickness, upon 320–400 nm illumination at an intensity of 100 mW/cm2, hydrogen gas was generated at the power-time normalized rate of 51 mL/hr•W at an overall conversion efficiency of 12.5%. To the best of our knowledge, this hydrogen generation rate is the highest reported for a titania-based photoelectrochemical cell.

High Al and H2O reaction hydrogen generation using a different crystalline phases of synthesized Al(OH)3 Nano Particle catalyst: Positive Roles of Nitrogen-containing salts

2021 ◽  
Author(s):  
Samikannu Prabu ◽  
Hong-Wen Wang
Keyword(s):  
Catalytic Effect ◽  
Hydrogen Generation ◽  
Nano Particles ◽  
Nano Particle ◽  
Crystalline Phases

This research investigated the high catalytic effect for the hydrogen generation from Al/water reaction utilizing different crystalline phases of Al(OH)3 Nano Particles (NPs). Al(OH)3 NPs were incorporated through a basic...

Investigation of Some Characterizations of Black TiO\(_2\) Nanotubes Via Spectroscopic Methods

2019 ◽  
Vol 29 (2) ◽  
pp. 189 ◽  
Author(s):  
Tho Truong Nguyen ◽  
Thi Minh Cao ◽  
Hieu Van Le ◽  
Viet Van Pham
Keyword(s):  
Water Splitting ◽  
Oxygen Vacancies ◽  
Light Response ◽  
Nanotube Arrays ◽  
Spectroscopic Methods ◽  
Visible Light Response ◽  
Uv Visible ◽  
Visible Reflectance ◽  
Splitting Effect ◽  
Anodization Method

The black TiO\(_2\) with substantial Ti\(^3+\) and oxygen vacancies exhibit an excellent photoelectrochemical water-splitting performance due to the improved charge transport the extended visible light response. In this study, black TiO\(_2\) nanotube arrays synthesized by the anodization method, and then, they have been investigated some characterizations by spectroscopic methods such as UV-visible reflectance (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and photoluminescence spectrum. The results showed that some highlighted properties of the black TiO2 nanotube arrays and they could apply for water-splitting effect.

Gold Nanoparticles Modified Titania Nanotube Arrays for Amperometric Determination of Ascorbic Acid

2010 ◽  
Vol 43 (18) ◽  
pp. 2809-2822 ◽  
Author(s):  
T. G. Satheesh Babu ◽  
P. V. Suneesh ◽  
T. Ramachandran ◽  
Bipin Nair
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Nanotube Arrays ◽  
Amperometric Determination ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube

scholarly journals Decolorization of Methylene Blue by Ag/SrSnO3 Composites under Ultraviolet Radiation

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Patcharanan Junploy ◽  
Titipun Thongtem ◽  
Somchai Thongtem ◽  
Anukorn Phuruangrat
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Separation Process ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Negative Effect ◽  
Uv Visible

SrSn(OH)6 precursors synthesized by a cyclic microwave radiation (CMR) process were calcined at 900°C for 3 h to form rod-like SrSnO3. Further, the rod-like SrSnO3 and AgNO3 in ethylene glycol (EG) were ultrasonically vibrated to form rod-like Ag/SrSnO3 composites, characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron microscopy (EM), Fourier transform infrared (FTIR) spectroscopy, and UV-visible analysis. The photocatalyses of rod-like SrSnO3, 1 wt%, 5 wt%, and 10 wt% Ag/SrSnO3 composites were studied for degradation of methylene blue (MB, C16H18N3SCl) dye under ultraviolet (UV) radiation. In this research, the 5 wt% Ag/SrSnO3 composites showed the highest activity, enhanced by the electron-hole separation process. The photoactivity became lower by the excessive Ag nanoparticles due to the negative effect caused by reduction in the absorption of UV radiation.

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