Photoelectrochemical Behavior of the Ternary Heterostructured Systems CdS/WO3/TiO2

Мурашкина, А. А.; Bakiev, T. V.; Artem’ev, Yurii M.; Rudakova, Aida V.; Emeline, Alexei V.; Bahnemann, Detlef W.

doi:10.3390/catal9120999

Cited by 14 publications

(11 citation statements)

References 20 publications

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“…Pure TiO 2 and pure CdS show high charge transfer resistance in light, governed by the radius of the semicircle, leading to lower charge separation efficiency. With the formation of a heterojunction of CdS and TiO 2 , the charge transfer resistance of CdS@TiO 2 in light decreases sharply, indicative of efficient charge transfer by the heterojunction [52]. Furthermore, by incorporation of G between the CdS core and the TiO 2 shell, forming CdS@50G@TiO 2 , the charge transfer resistance in light is further decreased as shown by the radius of the semicircle in the inserted view of Figure 5b.…”

Section: Photoelectrochemical (Pec) Measurementsmentioning

confidence: 94%

“…Catalysts 2019, 9, x FOR PEER REVIEW 8 of 17 the charge transfer resistance of CdS@TiO2 in light decreases sharply, indicative of efficient charge transfer by the heterojunction [52]. Furthermore, by incorporation of G between the CdS core and the TiO2 shell, forming CdS@50G@TiO2, the charge transfer resistance in light is further decreased as shown by the radius of the semicircle in the inserted view of Figure 5b.…”

Section: Photoelectrochemical (Pec) Measurementsmentioning

confidence: 97%

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Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 (CdS@G@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

et al. 2020

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Aiming to achieve enhanced photocatalytic activity and stability toward the generation of H2 from water, we have synthesized noble metal-free core-shell nanoparticles of graphene (G)-wrapped CdS and TiO2 (CdS@G@TiO2) by a facile hydrothermal method. The interlayer thickness of G between the CdS core and TiO2 shell is optimized by varying the amount of graphene quantum dots (GQD) during the synthesis procedure. The most optimized sample, i.e., CdS@50G@TiO2 generated 1510 µmole g−1 h−1 of H2 (apparent quantum efficiency (AQE) = 5.78%) from water under simulated solar light with air mass 1.5 global (AM 1.5G) condition which is ~2.7 times and ~2.2 time superior to pure TiO2 and pure CdS respectively, along with a stable generation of H2 during 40 h of continuous operation. The increased photocatalytic activity and stability of the CdS@50G@TiO2 sample are attributed to the enhanced visible light absorption and efficient charge separation and transfer between the CdS and TiO2 due to incorporation of graphene between the CdS core and TiO2 shell, which was also confirmed by UV-vis, photoelectrochemical and valence band XPS measurements.

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Section: Photoelectrochemical (Pec) Measurementsmentioning

confidence: 94%

Section: Photoelectrochemical (Pec) Measurementsmentioning

confidence: 97%

Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 (CdS@G@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

et al. 2020

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“…In the last few years, the EIS method has become a very promising method for studying heterostructured photoactive materials with the aim of improving their performance by identifying the origin of the limitations of their energy conversion and stability. The number of publications devoted to the application of this technique to the study of photoprocesses involving various heterostructures is quite large and constantly continues to grow [123,124,[137][138][139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154]. By studying the system's response to an exciting small-amplitude signal in a broad frequency range one can obtain information on both the charge transfer kinetics through the solid/solid interface and the structure and the properties of this interface.…”

Section: Electrophysical Characterizationmentioning

confidence: 99%

Photoactive Heterostructures: How They Are Made and Explored

et al. 2021

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In our review we consider the results on the development and exploration of heterostructured photoactive materials with major attention focused on what are the better ways to form this type of materials and how to explore them correctly. Regardless of what type of heterostructure, metal–semiconductor or semiconductor–semiconductor, is formed, its functionality strongly depends on the quality of heterojunction. In turn, it depends on the selection of the heterostructure components (their chemical and physical properties) and on the proper choice of the synthesis method. Several examples of the different approaches such as in situ and ex situ, bottom-up and top-down, are reviewed. At the same time, even if the synthesis of heterostructured photoactive materials seems to be successful, strong experimental physical evidence demonstrating true heterojunction formation are required. A possibility for obtaining such evidence using different physical techniques is discussed. Particularly, it is demonstrated that the ability of optical spectroscopy to study heterostructured materials is in fact very limited. At the same time, such experimental techniques as high-resolution transmission electron microscopy (HRTEM) and electrophysical methods (work function measurements and impedance spectroscopy) present a true signature of heterojunction formation. Therefore, whatever the purpose of heterostructure formation and studies is, the application of HRTEM and electrophysical methods is necessary to confirm that formation of the heterojunction was successful.

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“…The photons of light having higher energy than the energy gap of semiconducting material, when irradiated on the photocatalyst material, results in photo generated charge carriers usually termed the electron hole pair. This generation of electron-hole pairs in the conduction band and valence band acts as the foundation for redox reactions, as indicated below [29,30]:…”

Section: Photocatalysis: Theoretical Digestmentioning

confidence: 99%

Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review

et al. 2020

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Hydrogen production via water dissociation under exposure to sunlight has emanated as an environmentally friendly, highly productive and expedient process to overcome the energy production and consumption gap, while evading the challenges of fossil fuel depletion and ecological contamination. Various classes of materials are being explored as viable photocatalysts to achieve this purpose, among which, the two-dimensional materials have emerged as prominent candidates, having the intrinsic advantages of visible light sensitivity; structural and chemical tuneability; extensively exposed surface area; and flexibility to form composites and heterostructures. In an abridged manner, the common types of 2D photocatalysts, their position as potential contenders in photocatalytic processes, their derivatives and their modifications are described herein, as it all applies to achieving the coveted chemical and physical properties by fine-tuning the synthesis techniques, precursor ingredients and nano-structural alterations.

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Photoelectrochemical Behavior of the Ternary Heterostructured Systems CdS/WO3/TiO2

Cited by 14 publications

References 20 publications

Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 (CdS@G@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 (CdS@G@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

Photoactive Heterostructures: How They Are Made and Explored

Two-Dimensional Materials and Composites as Potential Water Splitting Photocatalysts: A Review

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