A Facile in Situ Hydrothermal Method to SrTiO<sub>3</sub>/TiO<sub>2</sub> Nanofiber Heterostructures with High Photocatalytic Activity

Cao, Ting; Li, Yuejun; Wang, Changhua; Shao, Changlu; Liu, Yichun

doi:10.1021/la104195v

Cited by 275 publications

(170 citation statements)

References 34 publications

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“…2b, the spectrum of Ti 2p can be separated into three peaks at about 458.3, 464.0 and 472.1 eV. According to the references, 31,32 the previous two peaks were respectively attributed to Ti 2p 3/2 and Ti 2p 1/2 of the TNTs, and the last at 472.1 eV was depicted as Ti 2p 3/2 of SrTiO 3 . Two peaks of O 1s centered at approximately 529.6 and 531.8 eV could be observed in Fig.…”

Section: Resultsmentioning

confidence: 95%

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells

Sun

Hong

Zang

et al. 2017

J. Electrochem. Soc.

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Heterostructured SrTiO 3 -TiO 2 nanotube arrays (ST-TNTAs) on fluoride doped SnO 2 conductive glass (FTO) were synthesized through a three-step in-situ hydrothermal reaction. TiO 2 nanotubes in ST-TNTAs vertically grew on the FTO substrate in single crystallized rutile phase, while SrTiO 3 grains in cubic perovskite phase dispersed evenly on the surface of TiO 2 . The sandwich shaped all-solid-state dye-sensitized solar cells (DSSCs) were assembled with TiO 2 nanorods, nanotubes and ST-TNTAs as the photoanode, respectively. Once SrTiO 3 deposited, the position of Fermi level of the composited semiconductor raised, resulting in the increase of open circuit voltage (V OC ). Meanwhile, both short-circuit current density (J SC ) and photoelectrical conversion efficiency (η) increased first and then decreased with the amount of SrTiO 3 . In comparison to TiO 2 nanorods and nanotubes, ST-TNTAs demonstrated the highest photoelectrical conversion efficiency (5.42%) under the irradiation of solar simulator and external quantum efficiency (EQE) at visible region, and also the lowest electron transfer resistance, which further proved that SrTiO 3 acted as a good medium for electron transfer between TiO 2 and photosensitizer. As a result, both the increased surface area of the nanotube relative to the nanorod and the matched bandgap structure in the composited structure of TiO 2 and SrTiO 3 improve the performance of the DSSCs. Along with rising energy and environmental problems, the demand of energy is growing all the time. As a renewable green energy, the use and transformation of solar energy has become a popular research field. [1][2][3]4 Compared with traditional semiconductor solar cells, the most obvious difference of dye-sensitized solar cells (DSSCs) is that light absorption and carrier transfer in DSSCs are completed by different materials, and the biggest advantage is that it is accomplished to conduct charges by the transfer of majority carriers.5 Two types of nanocrystalline solar cells represented by DSSCs and quantum dots sensitized cells (QDSCs) are mainly used and studied, in which TiO 2 usually acts as the best photoanode material for it is clean, efficient and stable. [6][7][8] In order to overcome the insufficiency of wide bandgap and the fast recombination of photo-induced charges, a variety of methods have been brought up by the researchers. 9,10 In the past decades, a number of studies have been conducted to speed up electronic transfer, promote the electron-hole separation and enlarge spectral response of the photoelectrical active TiO 2 . As a result, the nanocrystallized film photoelectrode should be optimized for minimizing the loss of injected electrons during the transfer process.11,12 As it is known, the photoelectrode with orderly structure is conducive to the separation and transfer of the photo-induced charges and the growth of oriented nano material is also relatively easy to control, which is therefore expected to further enhance short circuit current as well as photoelectrical conversion ...

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Section: Resultsmentioning

confidence: 95%

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells

Sun

Hong

Zang

et al. 2017

J. Electrochem. Soc.

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“…MWCNTs as support provides mechanical integrity to the support structure, whereas titania nanowires are proven to be active towards catalysis [52,53]. Literature report also shows titania in nanowire/nanorod form to be catalytically more active than in spherical form [33]. The MWCNTs in the interconnected twinned-structure also act as charge-carriers and compensate for the conductivity loss with titania.…”

Section: Resultsmentioning

confidence: 99%

“…Song et al reported that titania nanotubes prepared from polycrystalline TiO 2 have more interesting and unique properties than the latter [32]. It has been reported that the one-dimensional TiO 2 has larger surface area than the TiO 2 nanoparticles, which is essential, particularly in heterogeneous catalysis [32][33][34]. Shen et al investigated TiO 2 /MWCNTs based nanocomposites for usage in lithium-ion battery and this nanocomposite seems to be ideal for fast and efficient lithium storage [35].…”

Section: Introductionmentioning

confidence: 99%

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Selvaganesh¹,

Dhanasekaran²,

Bhat³

2017

Electrochemical Energy Technology

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Durability is a major issue and has been the growing focus of research for the commercialization of polymer electrolyte fuel cells (PEFCs). Corrosion of carbon support is a key parameter as it triggers the Pt catalyst degradation and affects cell performance, which in turn affects the longevity of the cells. Herein, we describe a hybrid composite support of TiO 2 -nanowires and Multiwalled carbon nanotubes (MWCNTs) that offers resistance to corrosion under stressful operating conditions. Titania nanowires which have been shown to be more efficient and catalytically active than spherically shaped TiO 2 . TiO 2 -MWCNT composites are prepared through a hydrothermal method, followed by Pt deposition using a polyol method. Crystal structure, morphology, and oxidation state are examined through various characterization techniques. Electrochemical performance of TiO 2 -nanowire/MWCNT composite-supported Pt at various ratios of TiO 2 /MWCNT is assessed in PEFCs. Pt on support with optimum composition of TiO 2 -nanowires to MWCNTs exhibits fuel cell performance superior to Pt on MWCNTs. Accelerated stress testing (AST) between 1 and 1.5 V reveals that the designed catalyst on nanocomposite support possesses superior electrochemical activity and shows only 16% loss in catalytic activity in relation to 35% for Pt/MWCNTs even after 6000 potential cycles. Subsequently, the samples were characterized after AST to correlate the loss in fuel cell performance

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“…With the steady and fast growing field of nanoscience and nanotechnology, nanostructured ceramics like zinc oxide and titanium oxide has become a promising photocatalyst for its high catalytic activity, low cost, and environmental friendliness [50,51,55,57, Electrospinning ceramic nanofibers have extremely high surface area due to its small sizes, and further provide channels for quick charge transfer due to its 1D nanostructures. Therefore, electrospun ceramics have huge potential for photo catalyst applications [47,57,[145][146][147][148][149][150][151][152][153][154][155]. Our group fabricated photocatalytically active Ag-ZnO composite nanofibers by electrospinning (Fig.…”

Section: Photo Catalystmentioning

confidence: 99%

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

Wu¹,

Pan²,

Lin³

et al. 2012

J Adv Ceram

252

108

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This paper provides a brief review of current research activities that focus on the synthesis and controlled assembly of inorganic nano bers by electrospinning, their electrical, optical and magnetic properties, as well as their applications in various areas including sensors, catalysts, batteries, filters and separators. We begin with a brief introduction to electrospinning technology and a brief method to produce ceramic nanofibers from electrospinning. We then discuss approaches to the controlled assembly and patterning of electrospun ceramic nanofibers. We continue with a highlight of some recent applications enabled by electrospun ceramic nano bers, with a focus on the physical properties of functional ceramic nanofibers as well as their applications in energy and environmental technologies. In the end, we conclude this review with some perspectives on the future directions and implications for this new class of functional nanomaterials. It is expected that this review paper can help the readers quickly become acquainted with the basic principles and particularly the experimental procedure for preparing and assembly of 1D ceramic nanofiber and its arrays.

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A Facile in Situ Hydrothermal Method to SrTiO₃/TiO₂ Nanofiber Heterostructures with High Photocatalytic Activity

Cited by 275 publications

References 34 publications

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

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A Facile in Situ Hydrothermal Method to SrTiO3/TiO2 Nanofiber Heterostructures with High Photocatalytic Activity

Cited by 275 publications

References 34 publications

The Application of Heterostructured SrTiO3-TiO2Nanotube Arrays in Dye-Sensitized Solar Cells

The Application of Heterostructured SrTiO3-TiO2Nanotube Arrays in Dye-Sensitized Solar Cells

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

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A Facile in Situ Hydrothermal Method to SrTiO₃/TiO₂ Nanofiber Heterostructures with High Photocatalytic Activity

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells

The Application of Heterostructured SrTiO₃-TiO₂Nanotube Arrays in Dye-Sensitized Solar Cells