Photoelectrochemical Activity of Cu-Loaded TiO2 Nanotube Arrays by AC Electrodeposition

2014 ◽  
Vol 602-603 ◽  
pp. 980-984 ◽  
Author(s):  
Jian Ling Zhao ◽  
Qiao Wen Fan ◽  
Ying Juan Mi ◽  
Jing Yang ◽  
Xi Xin Wang
Keyword(s):  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Photoelectrochemical Property ◽  
Photoelectrochemical Activity ◽  
Solution Deposition ◽  
X Ray ◽  
Cu Content ◽  
Novel Approach ◽  
Deposition Voltage ◽  
Scanning Electron

This work presents a novel approach for preparing Cu-loaded TiO2 nanotube arrays through alternating current electrodeposition. The Cu content loaded on the arrays was controlled by changing the concentration of Cu (NO3)2 solution, deposition voltage and time. The surface morphology and crystal structure of Cu-loaded TiO2 nanotube arrays were characterized by scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The effects of Cu content on the photoelectrochemical property were studied in detail. Results show that Cu-loaded TiO2 nanotube arrays have evidently enhanced photoelectrochemical activity. The photocurrent of Cu-loaded TiO2 nanotube arrays prepared in 0.00625 mol/L Cu (NO3)2 solution at 12 V for 20 seconds was 5.7 and 2.3 times as that of unloaded TiO2 nanotube arrays under visible and UV radiation, respectively.

Effect of Cu Content on the Tribological Performance of Cr-N Coatings at High Temperatures (840°C)

2009 ◽  
Author(s):  
Kyriaki Polychronopoulou ◽  
Claus Rebholz ◽  
Nicholaos G. Demas ◽  
Andreas A. Polycarpou ◽  
P. N. Gibson
Keyword(s):  
Vapor Deposition ◽  
Photoelectron Spectroscopy ◽  
Physical Vapor Deposition ◽  
Tribological Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Content ◽  
Glancing Angle ◽  
Scanning Electron ◽  
Ball On Disc

Cr-N and Cu-Cr-N coatings with Cu content between 3–65 at.%, Cu/Cr ratios in the 0.04–4.5 range and 21–27 at.% N, synthesized by twin e-beam Physical Vapor Deposition (EBPVD) at 450°C, were investigated. Using X-ray photoelectron spectroscopy (XPS), glancing angle X-ray diffraction (GAXRD) and scanning electron microscopy (SEM), in combination with nanoindentation mechanical property measurements and laboratory controlled ball-on-disc sliding experiments, it is shown that Cu-Cr-N coatings with low Cu content (3 at.%) possess sufficient wear resistance for high temperature demanding tribological applications.

Photoelectrocatalytic Degradation of HCB by N-Doped TiO2 Nanotube Arrays

2013 ◽  
Vol 652-654 ◽  
pp. 1580-1584
Author(s):  
Yu Jiang Guan ◽  
Zi Bo Wang ◽  
Shu Li Bai ◽  
Qin Xue
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ph Value ◽  
Nanotube Arrays ◽  
Simulated Sunlight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photoelectrocatalytic Degradation ◽  
Doping Behavior ◽  
Doped Titanium Dioxide ◽  
Scanning Electron

N-doped Titanium dioxide (TiO2) nanotube arrays were characterized by scanning electron microscope (SEM)，X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyse its surface morphology, crystal types and the doping behavior of nitrogen. The material was used as electrode for photoelectrocatalytic degradation of hexachlorobenzen under irradiation of simulated sunlight. The effects of photocatalysis, electrocatalysis, photoelectrocatalysis, the concentration of Na2SO4 and pH value on degradation of HCB were investigated.

Effect of Preparation on Microstructure of Ag-Loaded TiO2 Nanotube Arrays

2017 ◽  
Vol 748 ◽  
pp. 155-159
Author(s):  
Somkuan Photharin ◽  
Udom Tipparach
Keyword(s):  
Room Temperature ◽  
Ammonium Fluoride ◽  
Deionized Water ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Titanium Foils ◽  
Anodization Method ◽  
Scanning Electron

We have synthesyzed TiO2 nanotubes by an anodization method. The cathode was titanium (Ti) sheets and anode was platinum (Pt). The electrolytes were mixtures of ethylene glycol (EG), ammonium fluoride (NH4F) and deionized water (DI water). The anodizing voltage was set to 50 V and the process was carried out for 2 h. The titanium foils were anodized at room temperature. Then Ag nanoparticles were loaded in TiO2 nanotube arrays by immersed in 50 ml solutions containing of AgNO3 (1.0, 1.5 and 2.0 mM) for 24 h. The morphology, structure, and optical properties of the prepared nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and and UV-vis spectroscopy (UV-vis) respectively. The structures of TiO2 nanotubes obtained from the nanotube arrays were crystallized by annealing at 450 °C for 2 h before immersed in solution and immersed in solution before crystallized by annealing are similar. When the concentration of silver nitrate (AgNO3) increases, the TiO2 nanotube arrays cracked and are not well arranged.

scholarly journals Synthesis and Photoelectrochemical Activity of TiO2 Nanotube Based Free Standing Membrane

2020 ◽  
Vol 32 (11) ◽  
pp. 2739-2742
Author(s):  
Misriyani ◽  
E.S. Kunarti
Keyword(s):  
Tio2 Nanotubes ◽  
Ammonium Fluoride ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Free Standing ◽  
Photoelectrochemical Activity ◽  
Fluoride Solution ◽  
X Ray ◽  
Anodization Method ◽  
Scanning Electron

TiO2 nanotubes (TNTs) were synthesized and modified using the anodization method in a glycerol and ammonium fluoride solution, which was followed by a thermal treatment. The second anodisation was continued by increasing anodizing voltage to deposit a film on the surface of titanium, which resulted in a free standing membrane based on of TNTs. The nanotubes were further characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The SEM result showed that the layer thickness of free standing membrane based on TNTs increased with an increase in the anodizing voltage; however, at high voltages, this layer was damaged. The XRD and FTIR results indicated the generation of TNT having an anatase crystal phase. The results of test for photoelectrochemical properties showed that the optimal conditions of anodizing voltage was 50 V maintained for 1 h.

Higher Photocatalytic Activity of P-Incorporated TiO2 Nanotube Arrays

2015 ◽  
Vol 1087 ◽  
pp. 452-456
Author(s):  
Khairul Arifah Saharudin ◽  
Srimala Sreekantan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Degradation Rate ◽  
Oxygen Vacancies ◽  
Xrd Analysis ◽  
Nanotube Arrays ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

TiO2 nanotubes arrays were prepared by anodization of Ti in EG containing H3PO4 and NH4F electrolyte. The samples were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDX) and photoluminescence spectra (PL). The as-anodized TiO2 nanotubes were annealed in inert (argon), reducing (nitrogen), or oxidizing (oxygen) atmosphere at 400 °C for 4 hr. XRD analysis revealed that the TiO2 nanotubes were anatase after annealing. In this study, the TiO2 nanotubes annealed in argon exhibited the highest degradation rate of methyl orange (MO) solution under ultraviolet irradiation among the samples. The degradation rate was approximately 98% after 5h, which may be ascribed to the large amount of oxygen vacancies and defects (phosphorus) within the Ar - TiO2 sample that simultaneously increased the degradation rate of MO.

Microstructure and Properties of W-Cu Composites Fabricated by Laser Cladding Forming

2016 ◽  
Vol 849 ◽  
pp. 580-589
Author(s):  
Guang Yuan Wang ◽  
Sai Nan Gu ◽  
Yuan Qin ◽  
Sen Yang
Keyword(s):  
Laser Cladding ◽  
Hardness Test ◽  
Structure And Properties ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Content ◽  
Ni Content ◽  
Structure Phase ◽  
Scanning Electron

In this paper, the rapid prototyping of W-Cu composites by laser cladding was reported. The influence of the mass ratio of W and Cu on the structure and properties were investigated. Ni and Co were added to the W-Cu composites to promote the sintering densification. The effect of the elements on the structure, phase composition and properties of W-Cu composites was investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDX) and hardness test. The results showed that when Cu content increases to 60 wt.%, W particles were distributed around Cu agglomerates. When Ni content increases to 3.0 wt.%, γ-Ni phase could be observed. It was found that Co was concentrated at the interface between W and Cu phase and enhance the diffusion of W in Cu phase. Both Ni and Co could increase the density of the W-Cu composites greatly.

Study on Photoelectrochemical Performance of ZnO Nanotube /CdSeQuantum Dot-Sensitized Solar Cell

2011 ◽  
Vol 399-401 ◽  
pp. 1429-1432 ◽  
Author(s):  
Ping Fang Tao ◽  
Jun He ◽  
Chun Jie Liang ◽  
Jian Peng Han ◽  
Li Qin Qin ◽  
...  
Keyword(s):  
Solar Cell ◽  
Quantum Dot ◽  
Power Conversion ◽  
X Ray Diffraction ◽  
Photoelectrochemical Property ◽  
Photoelectrochemical Performance ◽  
X Ray ◽  
Zno Nanotube ◽  
Zno Nanotubes ◽  
Scanning Electron

ZnO; Quantum Dot-sensitized Solar Cell; CdSe; Photoelectrochemical property Abstract: ZnO nanotubes (NTs) were successfully fabricated with a hydrothermal method at low temperature. X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been utilized to characterize the samples. The ZnO nanotubes, sensitized by CdSe, were used as a photoanode of a quantum dot sensitized solar cell, which generated a maximum power conversion efficiency of 0.95%.

Influence of Deposition Voltage on Growth of ZnO Nanowires by Cathodic Electrodeposition

2013 ◽  
Vol 829 ◽  
pp. 732-736
Author(s):  
Elahe Akbari ◽  
Nooshin Ayati ◽  
Seyed Pirooz Marashi
Keyword(s):  
Nanowire Arrays ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Oxide Nanowires ◽  
X Ray ◽  
Cathodic Electrodeposition ◽  
Deposition Parameters ◽  
Deposition Voltage ◽  
Vertically Aligned ◽  
Scanning Electron

Zinc oxide nanowires (NWs) were synthesized by potentio-static cathodic electrodepsition in polycarbonate (PC) template at 70 °C. The electro-reduction of hydroxide ions in presence of Zn2+ ions within Zn (NO3)2 is involved in the growth of nanowire arrays. Altering various deposition parameters such as deposition voltage made it possible to obtain arrays of vertically aligned ZnO NWs with different growth rates. Furthermore, the effect of voltage on the chronoamperometric diagrams was studied. The X-ray diffraction pattern clearly confirms the polycrystalline nature of the ZnO NWs; however, Scanning Electron Microscopy (SEM) images reveal that the length of NWs slightly increases by increasing deposition voltage. It is demonstrated that varying deposition voltage has a significant impact on the growth rate but a small changes of the size of NWs is observed.

Fabrication and Photocatalytic Activities of TiO2 Nanotube Arrays

2012 ◽  
Vol 460 ◽  
pp. 151-154
Author(s):  
Ya Fang Tu ◽  
Qiu Ming Fu ◽  
Xiao Juan Niu ◽  
Jian Ping Sang ◽  
Zhi Jie Tan ◽  
...  
Keyword(s):  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Liquid Phase Deposition ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Scanning Electron

TiO2 nanotube arrays were prepared using template-based liquid phase deposition method. Their morphologies and structures were investigated by scanning electron micro¬scopy, transmission electron microscopy and X-ray diffraction. The photocatalytic properties of the samples were evaluated with the degradation of methylene blue under UV irradiation. It was found that the TiO2 nanotube arrays annealed at 900 °C showed the highest photocatalytic activity.

Discharge Relaxation of TiO2-WO3 Composite Nanotube Arrays

2011 ◽  
Vol 492 ◽  
pp. 304-307 ◽  
Author(s):  
Yu Qing Zhuo ◽  
Yun Han Ling ◽  
Liang Huang
Keyword(s):  
Open Circuit Potential ◽  
Open Circuit ◽  
Nanotube Arrays ◽  
Photoelectrochemical Properties ◽  
X Ray Diffraction ◽  
Nanostructured Film ◽  
X Ray ◽  
Anodization Process ◽  
Storage Behavior ◽  
Scanning Electron

Smooth and aligned TiO2-WO3 composite nanotube arrays (TiW-NTA) were successfully fabricated on a Ti-W alloy via an anodization process. The crystal phase and surface morphology of the nanostructured film were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The photoelectrochemical properties of the as-prepared samples were studied by measurement of the photocurrent response and open-circuit potential. The TiO2-WO3 nanotube arrays were found to be capable of a more than 2.5h discharge relaxation due to its energy storage behavior.

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