Single Molecule Photocatalysis on TiO<sub>2</sub> Surfaces

Guo, Qing; Ma, Zhibo; Zhou, Chuanyao; Ren, Zefeng

doi:10.1021/acs.chemrev.9b00226

Cited by 249 publications

(126 citation statements)

References 195 publications

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“…In respect to photocatalytic studies, STM studies have been extensively used to elucidate surface processes down to the single molecule photochemistry at model TiO 2 substrates as recently reviewed. 227 STM studies in combination with density functional theory (DFT) calculations revealed that H 2 O molecules dissociate at the h111i-oriented steps of rutile TiO 2 (110) and O v sites producing bridging OH (OH b ) groups. 228 Low temperature vacuum STM studies of H 2 O photochemistry under UV irradiation revealed a HO-H bond cleavage, leading to the formation of surface OH b and OH t species OH on Ti 5c sites as schematically and experimentally shown in Fig.…”

Section: Reproduced From Ref 153 With Permission From John Wiley Andmentioning

confidence: 99%

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

2021

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Section: Reproduced From Ref 153 With Permission From John Wiley Andmentioning

confidence: 99%

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

2021

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“…The exploitation of photocatalysts is one of the keys to realize the high‐performance application of photocatalytic technology 10‐12 . Up to now, various semiconductor photocatalysts have been developed, including metal oxides (TiO 2 , Bi 2 O 3 , etc), 13‐16 metal sulfides (MoS 2 , Bi 2 S 3 , etc), 17‐21 multi‐component oxides (Bi 2 WO 6 , SrTiO 3 , etc), 22‐25 metal selenides (MoSe 2 , CdSe, etc), 26‐29 metal phosphides (Co 2 P, Ni 2 P, etc), 30‐32 metal phosphates (Ag 3 PO 4 , BiPO 4 , etc), 33,34 metal halides (AgBr, etc), 35‐37 metal oxyhalides (BiOBr, BiOCl, etc), 38‐40 metal‐free materials (SiC, g‐C 3 N 4 , etc) 41‐43 and so on. Among them, the semiconductor with a band gap of Eg ≥ 3 eV are called wide‐band‐gap photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Bi‐based photocatalysts for light‐driven environmental and energy applications: Structural tuning, reaction mechanisms, and challenges

Chen

Liu

Cui

et al. 2020

EcoMat

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Environmental pollution and energy crisis have become major challenges to sustainable development of human society. Solar-driven photocatalytic technology is regarded as an extremely attractive solution to environmental remediation and energy conversion. Unfortunately, practical applications of traditional photocatalysts are restricted owing to the poor absorption of visible light, insufficient charge separation and undefined reaction mechanism. Therefore, developing novel visible light photocatalysts and exploring their modification strategies are significant in the area of photocatalysis. Bi-based photocatalysts have attracted wide attention due to unique geometric structures, tunable electronic structure and decent photocatalytic activity under visible light. At present, Bi-based photocatalysts can be mainly classified as bismuth metal, binary oxides, bismuth oxyhalogen, multicomponent oxides and binary sulfides, and so forth. Although they can be used as independent photocatalysts for environmental purification and energy development, their efficiency is not ideal. Therefore, many efforts have been made to enhance their photocatalytic performance in the past few decades. Significant progresses in determining the fundamental properties of photocatalysts, improving the photocatalytic performance and understanding the photocatalytic mechanism in important reactions have been made benefited from the various new developed concepts and approaches. This review introduces the structural properties of Bi-based photocatalysts in detail and summarizes the design and modification strategy for improving the photocatalytic performance, including metal/ Peng Chen and Hongjing Liu contributed equally to this work.

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“…[ 61 ] This strategy is a good candidate for realizing high efficiency in photocatalytic reactions as well. [ 88–90 ] Atomically dispersed Au and Pt have been reported, demonstrating how they exist in atomic form, and suggesting their potentials for catalytic reactions. [ 91–94 ] For single‐atom catalysts, isolating single atoms on the supports and the corresponding catalytic reactions remains challenging.…”

Section: Modifying Strategies To Enhance the Photocatalytic Activity mentioning

confidence: 99%

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

Jeon

Kweon

Jang

et al. 2020

Advanced Sustainable Systems

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charge separation and intrinsic efficiency, which are limited by the material's wide bandgap (≈3 eV). To overcome these issues, countless studies have focused on modifying the properties of TiO 2 , such as controlling its crystal structures, morphologies, vacancies, and doping. Existing natural TiO 2 polymorphs, the anatase and rutile phases, are generally considered representative photocatalytic materials. However, brookite has not been actively studied because in the past it has been difficult to synthesize. Anatase is known to more efficiently separate photoexcited charge carriers than rutile, but its thermodynamic stability has the reverse tendency. [14,15] While studying the different properties of various TiO 2 crystal structures, morphology-dependent characteristics have also been investigated, including efficient charge carrier dynamics, which include longer charge carrier diffusion length than the particle size to separate charges suppressing charge recombination. In addition to these high-crystalline-controlled studies, defect engineering approaches have also been vigorously investigated, to extend the material's light absorption range from the ultraviolet (UV) region to visible light. The general method used to enhance photocatalytic performance has been to introduce defects into TiO 2 structures, by chemical and physical doping, and induce vacancies in titanium (Ti) or oxygen (O) positions. These defect engineering strategies create new energy states, which act as charge trapping sites or narrowing bandgap to extend light absorption region. The formation of new energy states and defect sites is dependent on synthesis methods and conditions, indicating that predicting property and mechanism of synthesized TiO 2 materials is difficult before testing catalytic reactions. This uncertainty is one of the main problems to design new high-performance catalysts. Up to now, numerous researches have been reported to enhance photocatalytic activities and to reveal the mechanism. Even though it has not been confirmed the mechanism and activity for all situations, we can get insight for comprehensive understanding to predict and to design new catalysts. This work reviews modifying strategies of TiO 2 materials to enhance their photocatalytic activity with categorizing in the several systems. First, the basic principles of photocatalytic reactions on TiO 2 are described. Second, the characteristics of surface modification with other elements and doped systems in the lattice of photocatalysts are discussed. Finally, multicomponent heterostructure systems and current photocatalyst To address energy and environmental problems, innumerable titanium dioxide (TiO 2)-based photocatalysts have been reported over the last four decades. TiO 2 has attracted immense interest because it is low-cost, abundant, and photoresponsive. Sunlight-driven fuel production is one of the ideal photocatalytic approaches in terms of economics and the environment. However, performance issues with TiO 2 photocatalysts remain, including insuffici...

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Single Molecule Photocatalysis on TiO₂ Surfaces

Cited by 249 publications

References 195 publications

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

Bi‐based photocatalysts for light‐driven environmental and energy applications: Structural tuning, reaction mechanisms, and challenges

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

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Single Molecule Photocatalysis on TiO2 Surfaces

Cited by 249 publications

References 195 publications

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

Characterizing photocatalysts for water splitting: from atoms to bulk and from slow to ultrafast processes

Bi‐based photocatalysts for light‐driven environmental and energy applications: Structural tuning, reaction mechanisms, and challenges

Enhancing the Photocatalytic Activity of TiO2 Catalysts

Contact Info

Product

Resources

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Single Molecule Photocatalysis on TiO₂ Surfaces

Enhancing the Photocatalytic Activity of TiO₂ Catalysts