Heat treatment effect of a hybrid consisting of SnO2 nanorod and rutile TiO2 with heteroepitaxial junction on the photocatalytic activity

Suzuki, Haruya; Awa, Kenta; Naya, Shin‐ichi; Tada, Hiroaki

doi:10.1016/j.catcom.2020.106148

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…This section describes the general features of the conventional SnO 2 -TiO 2 nanohybrid photocatalysts without atomically commensurate junction (Scheme 1). The photocatalytic activity of TiO 2 can be greatly boosted by coupling with SnO 2 for various reactions [11][12][13][14][15][16][17]. It is worth noting that the electron acceptor in common with these reactions is molecular oxygen.…”

Section: Origin For the Sno 2 -Tio 2 Coupling Effectmentioning

confidence: 99%

“…In the as-grown SnO 2 -NR#TiO 2 , the apparent single SnO 2 -NR is actually composed of a bundle of thin SnO 2 NRs. This section discusses the effect of the formation of homojunction between the thin SnO 2 NRs on the photocatalytic activity [17]. The photocatalytic activity-heating temperature (T c ) curve in the SnO 2 -NR#TiO 2 system shows a volcanoshaped profile with the maximum activity at T c = 500 • C. The increase in the photocatalytic activity by the heating at T c = 500 • C results from the high electron mobility in the SnO 2 NRs with the fusion of the thin SnO 2 NRs.…”

Section: Atom-level Homojunction Effect 41 Sno 2 -Tio 2 Homojunction Systemsmentioning

confidence: 99%

“…The plot of k vs. Tc exhibits a volcano-shaped curve with the peak at Tc = 500 °C (Figure 6b), which well resembles the D-Tc one (Figure 6a). The heating effect on the photocatalytic activity can be explained in terms of the change in the homojunction state in the SnO2 NRs (Scheme 3) [17]. As explained in Section 3, SnO2-NR#TiO2 can work as an excellent charge separator owing to the smooth interfacial electron transfer from TiO2 to SnO2 through the high-quality interface and the subsequent electron transport in the SnO2-NR from the interface to the tip by the assistance of the lattice strain-induced unidirectional potential gradient in the CB [16].…”

Section: Sno2-tio2 Homojunction Systemsmentioning

confidence: 99%

“…However, the fundamental mechanism has not been fully understood so far. Further, the effects of atomically commensurate junctions in the SnO 2 -TiO 2 coupling system on the photocatalytic activity have recently been clarified [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Atomic Level Interface Control of SnO2-TiO2 Nanohybrids for the Photocatalytic Activity Enhancement

Tada

Naya

2021

Catalysts

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This review article highlights atom-level control of the heterojunction and homojunction in SnO2-TiO2 nanohybrids, and the effects on the photocatalytic property. Firstly, a comprehensive description about the origin for the SnO2-TiO2 coupling effect on the photocatalytic activity in the conventional SnO2-TiO2 system without heteroepitaxial junction is provided. Recently, a bundle of thin SnO2 nanorods was hetero-epitaxially grown from rutile TiO2 seed nanocrystals (SnO2-NR#TiO2, # denotes heteroepitaxial junction). Secondly, the heterojunction effects of the SnO2-NR#TiO2 system on the photocatalytic activity are dealt with. A novel nanoscale band engineering through the atom-level control of the heterojunction between SnO2 and TiO2 is presented for the photocatalytic activity enhancement. Thirdly, the homojunction effects of the SnO2 nanorods on the photocatalytic activity of the SnO2-NR#TiO2 system and some other homojunction systems are discussed. Finally, we summarize the conclusions with the possible future subjects and prospects.

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Section: Origin For the Sno 2 -Tio 2 Coupling Effectmentioning

confidence: 99%

Section: Atom-level Homojunction Effect 41 Sno 2 -Tio 2 Homojunction Systemsmentioning

confidence: 99%

Section: Sno2-tio2 Homojunction Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atomic Level Interface Control of SnO2-TiO2 Nanohybrids for the Photocatalytic Activity Enhancement

Tada

Naya

2021

Catalysts

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“…The XRD pattern obtained was in good agreement with the JCPDS file. Thus, the conditions of hydrothermal reactions followed in the present study were solely responsible for the formation of high pure phase formation [16,17]. Figure 1a shows the XRD pattern for rutile TiO 2 and that the pattern obtained for 4T possessed peaks corresponding to the planes of TiO 2 at 2θ = 27.4 (110), 36.0 (101), 39.1 (200), 41.2 (111), 44.0 (210), 54.3 (211), 56.6 (220), 62.7 (002), 64.0 (310) and 69.0 (301), respectively [18][19][20].…”

Section: Crystallinity and Surface Area Characterizationmentioning

confidence: 87%

Characterization of Pure Rutile Titania Nanoparticle Prepared by Feasible Method for Coatings and Visible Light-Driven Dye Removal Application

et al. 2021

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The pure phase of rutile titanium dioxide or titania (R-TiO2) was prepared by means of a strong acidic sol–gel process followed by treatment using a hydrothermal method. The as-prepared titania nanoparticles existed purely in the rutile phase instead of the mixed anatase phase of the respective titania (R-TiO2). The optimized reaction condition and precursor usage were the critical parameters for the formation of the particle size and uniform crystallinity of the rutile phase of TiO2 nanoparticle fabrication. XRD (X-ray diffraction), and Raman spectroscopic techniques were utilized to confirm the formation of the pure rutile phase of titania. SEM (scanning electron microscope) and TEM (Transmission electron microscope) images showed the cauliflower-like morphology of the as-prepared R-TiO2; reduced particle sizes of below 5 nm were observed and confirmed through high resolution images. The catalytic activity of the as-prepared R-TiO2 was tested under visible light irradiation for methylene blue dye degradation reactions. Dye degradation occurred very effectively, even at higher concentrations of methylene blue (MB), at reduced time intervals from 5 to 3 h of reaction time. The as-prepared rutile phase of pure titania nanoparticles was applied in a catalysis application for the purpose of inducing various types of organic dye degradation or catalytic transformation in the presence of visible light.

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Noble Metal‐Free Inorganic Photocatalyst Consisting of Antimony‐Doped Tin Oxide Nanorod and Titanium oxide for Two‐Electron Oxygen Reduction Reaction

et al. 2022

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This study reports a noble metal-free robust inorganic photocatalyst for H 2 O 2 synthesis via two-electron oxygen reduction reaction (ORR). Antimony-doped tin oxide nanorods were heteroepitaxially grown from rutile TiO 2 seed crystals with an orientation of (001) ATO //(001) TiO2 (ATOÀ NR//TiO 2 ,//denotes heteroepitaxial junction) by a hydrothermal method. UV-light irradiation of ATOÀ NR//TiO 2 particles stably and continuously produces H 2 O 2 from aerated aqueous solution of ethanol. Electrochemical measurements using rotating electrodes show that Sb-doping into SnO 2 greatly enhances the electrocatalytic activity for two-electron ORR. The striking photocatalytic activity of ATOÀ NR//TiO 2 stems from the effective charge separation, electrocatalytic activity for two-electron ORR, low catalytic activity for H 2 O 2 decomposition, and extraordinary robustness.

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Heat treatment effect of a hybrid consisting of SnO2 nanorod and rutile TiO2 with heteroepitaxial junction on the photocatalytic activity

Cited by 6 publications

References 14 publications

Atomic Level Interface Control of SnO2-TiO2 Nanohybrids for the Photocatalytic Activity Enhancement

Atomic Level Interface Control of SnO2-TiO2 Nanohybrids for the Photocatalytic Activity Enhancement

Characterization of Pure Rutile Titania Nanoparticle Prepared by Feasible Method for Coatings and Visible Light-Driven Dye Removal Application

Noble Metal‐Free Inorganic Photocatalyst Consisting of Antimony‐Doped Tin Oxide Nanorod and Titanium oxide for Two‐Electron Oxygen Reduction Reaction

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