Synergistic effect between TiO&lt;sub&gt;2&lt;/sub&gt; and ubiquitous metal oxides on photocatalytic activity of composite nanostructures

Turkevych, Ivan; Kosar, Sofia; Pihosh, Yuriy; Mawatari, Kazuma; Kitamori, Takehiko; Ye, Jinhua; Shimamura, Kiyoshi

doi:10.2109/jcersj2.122.393

Cited by 17 publications

(17 citation statements)

References 19 publications

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“…Using this approach, they managed to obtain non-stoichometric suboxides strongly attached to tube walls. Eventhough in their paper, SEM details are not shared, the photocatalytic activity of as-prepared composites is significantly higher compared to plane TiO 2 nanotubes [74], as shown in Fig. 3.16.…”

Section: Atomic Layer Depositionmentioning

confidence: 94%

“…The second paper by Turkevych and coauthors [74] has recently reported on the synergic effect between TiO 2 nanotubes and ubiquitous metal oxides on the photocatalytic activity of composite nanostructures, as depicted in Fig. 3.16c.…”

Section: Atomic Layer Depositionmentioning

confidence: 98%

“…The 2 published reports on the deposition of a secondary material in nanotubes by ALD deal with nanotubes of an AR of ≈15 [73] and ≈80 [74]. However, the recent results of the author (J. Macak) show that it is possible to achieve conformal coating of nanotubes with AR ratio well over 200 [76], as shown in Fig.…”

Section: Atomic Layer Depositionmentioning

confidence: 99%

“…Currently, there is no better technique available that would [73], b schematic drawing of nanoparticle synthesis inside nanotubes by ALD deposition of metalorganic precursors and subsequent reduction, modified from [74], c methylene blue decomposition rates k for TiO 2 nanotubes decorated as in (b) with various suboxides relative to the kTNT for plane TiO 2 nanotubes, modified from [74] enable such conformal and uniform coating of nanopores and nanotubes in the deep level of pores and tubes until their very bottoms.…”

Section: Atomic Layer Depositionmentioning

confidence: 99%

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Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Macák

2015

Electrochemically Engineered Nanoporous Materials

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Among various nanostructures, either electrochemically prepared or electrochemically applicable, vertically oriented, highly ordered TiO 2 nanotubular layers have attracted great scientific and technological interest in recent years. They posses a wide range of application opportunities across many fields due to the combination of their unique structure, mechanical and chemical stability, dimensions tunability, intrinsinc properties of TiO 2 , and the relatively simple and low-cost production. While many recent reviews focus on the synthesis of nanotubes, their properties and applications, there is no comprehensive report summarizing existing results on modifications of TiO 2 nanotube layers by a secondary material. Therefore, this chapter gives the state of the art and comprehensive overview on the routes for deposition of secondary materials inside and on tops of TiO 2 nanotubes by various means. Such depositions in all known cases exclusively lead either to new tube functionalities that are interesting from the fundamental point of view, or eventually to new advanced applications, most likely not plausible for tubes and deposited materials alone. Most frequently, the deposition proceeds on the very top surface of nanotube layers. However, there are techniques and tricks that allow deposition, decoration, coating or complete filling of nanotube interiors by a secondary material. The whole range of deposition techniques used until now for TiO 2 nanotube layers will be introduced and discussed. Selected results achieved for nanotube with secondary materials will be discussed in details. Finally, outlook towards future opportunities of the deposition methods for nanotube functionalizations will be given.

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Section: Atomic Layer Depositionmentioning

confidence: 94%

Section: Atomic Layer Depositionmentioning

confidence: 98%

Section: Atomic Layer Depositionmentioning

confidence: 99%

Section: Atomic Layer Depositionmentioning

confidence: 99%

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Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Macák

2015

Electrochemically Engineered Nanoporous Materials

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“…The effective utilization of ALD for deposition of various materials within TiO 2 nanotube layers has been demonstrated e.g. for oxides [26][27][28][29][30] and sulfides [31,32], yielding interesting synergic effects. Even though the use of the ALD to deposit Pt nanoparticles on various catalytic supports has been reported in previous works [33][34][35], no reports show an effective deposition of Pt nanoparticles within high aspect ratio 1D TiO 2 tubular nanostuctures.…”

Section: Introductionmentioning

confidence: 99%

Uniform ALD deposition of Pt nanoparticles within 1D anodic TiO2 nanotubes for photocatalytic H2 generation

Yoo

Zazpe

Cha

et al. 2018

Electrochemistry Communications

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In the present work we investigate the utilization of Pt nanoparticles produced by atomic layer deposition (ALD) within anodic TiO 2 nanotube (NT) layers for photocatalytic H 2 production. By varying numbers of ALD cycles, Pt nanoparticles with different diameters, uniformly decorating the tube walls were produced. The Pt nanoparticle size (2-15 nm), the Pt mass loading and areal density were strongly dependent on the number of Pt ALD cycles. The deposited Pt nanoparticles turned out to be highly effective as co-catalyst for photocatalytic H 2 generation. A most effective performance for solar light photocatalysis was reached after 26 ALD cycles (yielding an optimal areal coverage with particles of a diameter ≈ 7 nm). For UV light optimum photocatalytic efficiency was reached after 40 ALD cycles.

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MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

Krbal

Zazpe

et al. 2017

Adv Materials Inter

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in the materials science community. [2] Apart from the generation of H 2 and O 2 gases, photocatalysis can be extended to other applications. The early works on the irradiation of TiO 2 for purification of water via photocatalytic decomposition of pollutants were demonstrated by Frank and Bard in late 1970s. [3][4][5] These initial works and many reports later have shown that photooxidation of inorganic and organic contaminants is a promising route for environmental remediation. [6][7][8][9][10][11][12] In fact, the key factors that determine the efficiencies of a photocatalyst include its light harvesting capability and reduced charge carriers recombination of the photo generated electron-hole pairs. [3,13] However, TiO 2 possesses rather wide bandgap energies between 3.0 and 3.2 eV, with high photo activity only in the UV region (λ ≤ 390 nm) equivalent to only ≈5% of the solar spectrum. [14,15] Nevertheless, owing to its nontoxicity, low-cost synthesis, chemical inertness, and resistance against photocorrosion, TiO 2 has been long studied and recognized as the most promising photocatalyst material. [13,16] In order to harness more from the abundant renewable energy source, that is, solar energy, tremendous efforts have been devoted to reduce the bandgap energy of TiO 2 and broaden its optical absorption to the visible region. [8,[13][14][15]17,18] Bandgap engineering has been extensively carried out Ultrathin molybdenum oxyselenide (MoSe x O y ) coatings are made first ever by atomic layer deposition (ALD) within anodic 1D TiO 2 nanotube layers for photoelectrochemical and photocatalytic applications. The coating thickness is controlled through varying ALD cycles from 5 to 50 cycles (corresponding to ≈1-10 nm). In the ultraviolet region, the coatings have enhanced up to four times the incident photon-to-current conversion efficiency (IPCE), and the highest IPCE is recorded at 32% at (at λ = 365 nm). The coatings notably extend the photoresponse to the visible spectral region and remarkable improvement of photocurrent densities up to ≈40 times is registered at λ = 470 nm. As a result, the MoSe x O y -coated-TiO 2 nanotube layers have shown to be an effective photocatalyst for methylene blue degradation, and the optimal performance is credited to a coating thickness between 2 and 5 nm (feasible only by ALD). The enhancement in photoactivities of the presented heterojunction is mainly associated with the passivation effect of MoSe x O y on the TiO 2 nanotube walls and the suitability of bandgap position between MoSe x O y and TiO 2 interface for an efficient charge transfer. In addition, MoSe x O y possesses a narrow bandgap, which favors the photoactivity in the visible spectral region.

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Synergistic effect between TiO<sub>2</sub> and ubiquitous metal oxides on photocatalytic activity of composite nanostructures

Cited by 17 publications

References 19 publications

Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Uniform ALD deposition of Pt nanoparticles within 1D anodic TiO2 nanotubes for photocatalytic H2 generation

MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications

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Synergistic effect between TiO<sub>2</sub> and ubiquitous metal oxides on photocatalytic activity of composite nanostructures

Cited by 17 publications

References 19 publications

Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Self-organized Anodic TiO2 Nanotubes: Functionalities and Applications Due to a Secondary Material

Uniform ALD deposition of Pt nanoparticles within 1D anodic TiO2 nanotubes for photocatalytic H2 generation

MoSexOy‐Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light‐Driven Applications

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MoSe_xO_y‐Coated 1D TiO₂ Nanotube Layers: Efficient Interface for Light‐Driven Applications