Rational design and fabrication of TiO2 nano heterostructure with multi-junctions for efficient photocatalysis

Yu, Siqi; Han, Bing; Lou, Yunchao; Liu, Zhe; Qian, Guodong; Wang, Zhiyu

doi:10.1016/j.ijhydene.2020.07.184

Cited by 22 publications

(7 citation statements)

References 71 publications

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“…[10][11][12] Crystal-amorphous junctioned semiconductor has advantages over normal heterojunctioned semiconductor for charge separation: simple fabrication and lower probability to form charge trap level at the interface. [13][14][15][16][17][18][19] Phase transitions of a semiconductor significantly shift the conduction band minimum (CBM) and the valence band maximum (VBM). [20][21][22] Partial amorphization of semiconductor induce band offsets between crystalline and amorphous phases and can affect (photo)electrochemical reactions negatively or positively.…”

Section: Introductionmentioning

confidence: 99%

Strategy to utilize amorphous phase of semiconductor toward excellent and reliable photochemical water splitting performance: Roles of interface dipole moment and reaction parallelization

Choi

Han

Moon

et al. 2021

Intl J of Energy Research

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The roles of amorphous phases in photochemical water splitting of semiconductors are still in debate, as the effects of the amorphous phase are largely irregular even in a single material. We presumed that the photochemistry of crystal-amorphous mixed semiconductor systems would be governed by the interface characteristics, and conducted a systematic study to understand the origins of the largely varying photochemical reaction of semiconductors having an amorphous phase. First-principles calculations on crystalline anatase and amorphous TiO 2 showed that the coexistence of crystalline and amorphous TiO 2 and the exposure of the phase boundary are advantageous due to the accelerated charge separation by interface dipole moment and the parallelizable oxygen evolution reaction at the boundary. Our computationbased strategies were demonstrated in our experiments: only the TiO 2 nanoparticle and nanotube having partial amorphization on surfaces have highly enhanced photocatalytic water splitting performances (approximately 700%) compared to the pristine and completely amorphized TiO 2 systems.

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Section: Introductionmentioning

confidence: 99%

Strategy to utilize amorphous phase of semiconductor toward excellent and reliable photochemical water splitting performance: Roles of interface dipole moment and reaction parallelization

Choi

Han

Moon

et al. 2021

Intl J of Energy Research

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“…Additionally, the photocatalytic performance under vis irradiation has been improved for Pt-TiO 2 -H-Ag in comparison to platinum-modified samples, reaching 2382.7 µmol h −1 g −1 , i.e., being about 15.1, 17.2, and 1.4 times higher than that on Pt-P25, Pt-TiO 2 , and Pt-TiO 2 -H, respectively. Furthermore, the photocatalyst shows good stability (five re-cycles), suggesting that simultaneous extension of photoabsorption and improvement of the spatial separation of charge carriers could be used also for other wide bandgap metal-oxide semiconductor photocatalysts [68]. It should also be mentioned that other metals have been used for titania modification towards hydrogen evolution.…”

Section: Zero-dimension (0d) Photocatalystsmentioning

confidence: 98%

“…For example, Yu et al have obtained efficient hydrogen evolution on TiO 2 -based nanoheterostructures modified with Pt and Ag [68]. The development of metal-semiconductormetal nano-heterostructures for improving photocatalytic activity has been proposed, considering that they are not only the more efficient in harvesting light, but also in the spatial separation of charge carriers, which are important factors for high activity.…”

Section: Zero-dimension (0d) Photocatalystsmentioning

confidence: 99%

Morphology-Governed Performance of Multi-Dimensional Photocatalysts for Hydrogen Generation

et al. 2021

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In the past few decades, extensive studies have been performed to utilize the solar energy for photocatalytic water splitting; however, up to the present, the overall efficiencies reported in the literature are still unsatisfactory for commercialization. The crucial element of this challenging concept is the proper selection and design of photocatalytic material to enable significant extension of practical application perspectives. One of the important features in describing photocatalysts, although underestimated, is particle morphology. Accordingly, this review presents the advances achieved in the design of photocatalysts that are dedicated to hydrogen generation, with an emphasis on the particle morphology and its potential correlation with the overall reaction performance. The novel concept of this work—with the content presented in a clear and logical way—is based on the division into five parts according to dimensional arrangement groups of 0D, 1D, 2D, 3D, and combined systems. In this regard, it has been shown that the consideration of the discussed aspects, focusing on different types of particle morphology and their correlation with the system’s efficiency, could be a promising route for accelerating the development of photocatalytic materials oriented for solar-driven hydrogen generation. Finally, concluding remarks (additionally including the problems connected with experiments) and potential future directions of particle morphology-based design of photocatalysts for hydrogen production systems have been presented.

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“…Merging the sustainability with durability may be the key of transferring the photocatalytic process from the laboratory scale up to large applications. Until now there are many wide gap oxides (TiO 2 [ 4 , 5 ], SnO 2 [ 6 , 7 ], and ZnO [ 8 , 9 ]) and narrow band gap materials (Bi 2 WO 6 [ 10 , 11 ], Ag 3 PO 4 [ 12 , 13 ], BiPO 4 [ 14 , 15 ], g-C 3 N 4 [ 16 , 17 ], WO 3 [ 18 , 19 ], and BiOX [ 20 , 21 ]) studied for the potocatalytic removal of wastewater organic contaminants and indoor pollutants. The mono-components photocatalyst have disadvantages such as narrow visible light absorption [ 22 , 23 ], low specific surface area [ 24 , 25 ], and fast charge carriers recombination [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Tandem Structures Semiconductors Based on TiO2_SnO2 and ZnO_SnO2 for Photocatalytic Organic Pollutant Removal

Eneşca

Isac

2021

Nanomaterials

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The photocatalyst materials correlation with the radiation scenario and pollutant molecules can have a significant influence on the overall photocatalytic efficiency. This work aims to outline the significance of optimizing the components mass ratio into a tandem structure in order to increase the photocatalytic activity toward pollutant removal. ZnO_SnO2 and TiO2_SnO2 tandem structures were obtained by the doctor blade technique using different mass ratios between the components. The samples contain metal oxides with crystalline structures and the morphology is influenced by the main component. The photocatalytic activity was tested using three radiation scenarios (UV, UV-Vis, and Vis) and two pollutant molecules (tartrazine and acetamiprid). The results indicate that the photocatalytic activity of the tandem structures is influenced by the radiation wavelength and pollutant molecule. The TiO2_SnO2 exhibit 90% photocatalytic efficiency under UV radiation in the presence of tartrazine, while ZnO_SnO2 exhibit 73% photocatalytic efficiency in the same experimental conditions. The kinetic evaluation indicate that ZnO_SnO2 (2:1) have a higher reaction rate comparing with TiO2_SnO2 (1:2) under UV radiation in the presence of acetamiprid.

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Rational design and fabrication of TiO2 nano heterostructure with multi-junctions for efficient photocatalysis

Cited by 22 publications

References 71 publications

Strategy to utilize amorphous phase of semiconductor toward excellent and reliable photochemical water splitting performance: Roles of interface dipole moment and reaction parallelization

Strategy to utilize amorphous phase of semiconductor toward excellent and reliable photochemical water splitting performance: Roles of interface dipole moment and reaction parallelization

Morphology-Governed Performance of Multi-Dimensional Photocatalysts for Hydrogen Generation

Tandem Structures Semiconductors Based on TiO2_SnO2 and ZnO_SnO2 for Photocatalytic Organic Pollutant Removal

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