Template synthesis and characterization of WO3/TiO2composite nanotubes

Cheng, Lifang; Zhang, Xingtang; Liu, Bin; Wang, Hongzhe; Li, Yuncai; Huang, Yabin; Du, Zongliang

doi:10.1088/0957-4484/16/8/060

Cited by 62 publications

(25 citation statements)

References 24 publications

(20 reference statements)

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“…The synthesized samples were characterized by X-ray diffraction (XRD) using a RigakuD/max2550VL/PC system operated at 40 kV and 40 mA with Cu-Ka radiation (l = 1.5406 Å ), at a scan rate of 5u min 21 and a step size of 0.050u in 2h. Nitrogen adsorption measurements at 77 K were performed using an ASAP2020 volumetric adsorption analyzer, after the samples had been outgassed for 8 h in the degas port of the adsorption apparatus.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

et al. 2012

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Abstract"Nano tungsten oxide (WO3) particles were synthesized on the surface of graphene (GR) sheets by using a simple sonochemical method. The obtained composite, WO3@GR, was characterized by X-ray diffraction, N-2 adsorption/desorption analysis, thermo-gravimetric analysis, Raman spectroscopy and UV-vis diffuse reflectance spectra measurements. It was found that chemical bonds between the nano WO3 particles and the GR sheets were formed. The average particle size of the WO3 was evidenced to be around 12 nm on the GR sheets. When used as photocatalyst for water splitting, the amount of evolved O-2 from water for the WO3@GR composite with 40 wt% GR inside was twice and 1.8 times as much as that for pure WO3 and mixed-WO3/GR, respectively. The excellent photocatalytic property of the WO3@GR composite is due to the synergistic effects of the combined nano WO3 particles and GR sheets. The sensitization of WO3 by GR enhances the visible light absorption property of WO3@GR. The chemical bonding between WO3 and GR minimizes the interface defects, reducing the recombination of the photo-generated electron-hole pairs. Furthermore, the GR sheets in the WO3@GR composite enhance electrons transport by providing low resistance conduction pathways, leading to improved photo-conversion efficiency. The methodology opens up a new way of obtaining photoactive GR-semiconductor composites for photodissociating water under visible light." Nano tungsten oxide (WO 3 ) particles were synthesized on the surface of graphene (GR) sheets by using a simple sonochemical method. The obtained composite, WO 3 @GR, was characterized by X-ray diffraction, N 2 adsorption/desorption analysis, thermo-gravimetric analysis, Raman spectroscopy and UV-vis diffuse reflectance spectra measurements. It was found that chemical bonds between the nano WO 3 particles and the GR sheets were formed. The average particle size of the WO 3 was evidenced to be around 12 nm on the GR sheets. When used as photocatalyst for water splitting, the amount of evolved O 2 from water for the WO 3 @GR composite with 40 wt% GR inside was twice and 1.8 times as much as that for pure WO 3 and mixed-WO 3 /GR, respectively. The excellent photocatalytic property of the WO 3 @GR composite is due to the synergistic effects of the combined nano WO 3 particles and GR sheets. The sensitization of WO 3 by GR enhances the visible light absorption property of WO 3 @GR. The chemical bonding between WO 3 and GR minimizes the interface defects, reducing the recombination of the photo-generated electron-hole pairs. Furthermore, the GR sheets in the WO 3 @GR composite enhance electrons transport by providing low resistance conduction pathways, leading to improved photo-conversion efficiency. The methodology opens up a new way of obtaining photoactive GR-semiconductor composites for photodissociating water under visible light.

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Section: Characterizationmentioning

confidence: 99%

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

et al. 2012

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“…Anodization of aluminum can also produce an ordered nanostructure [43], although resembling more a nanomembrane (array of nanoholes) than nanostructures as those shown in the case of titanium anodization. Note, however, that highly ordered WO 3 /TiO 2 composite nanotubes have been prepared using anodic alumina as template [44]. It is thus possible to combine the features of these different materials to prepare in principle novel catalysts.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of TiO2 Thin Films: Relationship Between Preparation Conditions and Nanostructure

et al. 2008

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The influence of the synthesis conditions (pH, HF concentration, procedure of application of the voltage) during the anodization of Ti foils to produce TiO 2 thin films characterized by an ordered arrays of 1D nanostructures (nanorods, nanotubes) is discussed. Different types of 1D nanostructures could be obtained by changing the procedure of synthesis, as shown by field emission scanning electron microscopy images. The analysis of the current versus time curves during the procedure of synthesis provides indications on the sequence of processes occurring during the synthesis. It is also suggested that different growing mechanisms occur depending on the preparation, leading in turn to the different type of nanostructures observed. The relevance of this preparation method is related to the analysis of the relationship for oxide materials between nano-architecture and reactivity and gives the opportunity to prepare materials with an intermediate degree of complexity between model and applied catalysts.

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“…The traditional preparation methods of TNAs include hydrothermal synthesis [24,25] and template synthesis, in which porous alumina [26,27] , ZnO [28] and certain organic polymer [29,30] were used as templates. However, the TNAs prepared by both of the methods mentioned above were not fit for using as the film material in solar cells directly, because TNAs prepared with template synthesis usually resulted in large pore diameter, limited output and bad pattern.…”

Section: Preparation Of Tio 2 Nanotube Arraysmentioning

confidence: 99%

TiO2 nanotube arrays and TiO2-nanotube-array based dye-sensitized solar cell

et al. 2007

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To substitute the non-regular nano-crystalline semiconductor for a novel kind of ordered microstructure is a very important aspect in the domain of dye-sensitized solar cell. One of the researching hotspots is the highly-ordered TiO 2 nanotube architecture. As a new type of titania nano-material, titania nanotube arrays have drawn extraordinary attention due to its distinctive morphology, notable photoelectrical and hydro-sensitive performance. At 100% sun the new kind of TiO 2 nanotube arrays solar cell exhibits an overall conversion efficiency of 5.44%. This paper introduces the preparation methods of titania nanotube arrays, the existing problems and recent progress in titania nanotube arrays solar cell.anodic oxidation, TiO 2 nanotube arrays, dye-sensitized solar cellAs an important means to utilize solar energy, solar cell offers a promising future in application. There are two major kinds of solar cell products in current market, crystalline silicon and amorphous silicon. However, both of them have certain undesirability. As for the former kind, the preparation process was complicated and the cost was also very high. Short life cycle and low efficiency were the big problems for amorphous silicon solar cell. In 1991, Grätzel and co-workers [1] developed a new type of solar cell, dye-sensitized solar cell (DSSC), which took the complex of ruthenium as the sensitizer. Now the maximum incident photon-to-current conversion efficiency (IPCE) has already reached 11.04% [2] under AM1.5 irradiation. DSSC has drawn extensive attention due to its merits like low price, simple fabrication and high efficiency, etc.A schematic presentation of the structure of DSSC is shown in Figure 1. As a new generation of solar cells, DSSC consists of TiO 2 photo electrode, platinum counter electrode, sensitizer and electrolyte solution. Photo-excitation of the sensitizer is followed by electron injection into the conduction band of the mesoporous oxide semiconductor because of the difference in Fermi level. The photo-injected electrons go through the mesoporous network of the nano-structure and are collected at the transparent conduction layer, where they pass into the external circuit. The oxidized dye is subsequently reduced by electron donation from electrolyte containing the iodide/triiodide redox system. At the counter electrode, reduction of triiodide regenerates iodide through the donation of electrons from the external circuit, which completes the circuit [3][4][5][6][7] .The major factors limit the further improvement in the photo-conversion efficiencies achieved using nano-crystalline DSSC including the efficient absorption of incident light by dye molecules, fast separation of photo-generated charges and high speed transportation of electrons in the circuit, etc. [8] . There are many technical cruces to be solved urgently on the way to utilization of DSSC, especially the controllability of the prepared electrode material and electrode film evidently affected the overall conversion efficiency and stability of solar

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Template synthesis and characterization of WO₃/TiO₂composite nanotubes

Cited by 62 publications

References 24 publications

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis of TiO2 Thin Films: Relationship Between Preparation Conditions and Nanostructure

TiO2 nanotube arrays and TiO2-nanotube-array based dye-sensitized solar cell

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Template synthesis and characterization of WO3/TiO2composite nanotubes

Cited by 62 publications

References 24 publications

Synthesis of WO3@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis of WO3@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis of TiO2 Thin Films: Relationship Between Preparation Conditions and Nanostructure

TiO2 nanotube arrays and TiO2-nanotube-array based dye-sensitized solar cell

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Product

Resources

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Template synthesis and characterization of WO₃/TiO₂composite nanotubes

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water

Synthesis of WO₃@Graphene composite for enhanced photocatalytic oxygen evolution from water