Two-dimensional layered nanomaterials for visible-light-driven photocatalytic water splitting

Gan, Xiaorong; Lei, Dangyuan; Wong, Kwok Yin

doi:10.1016/j.mtener.2018.10.015

Cited by 84 publications

(48 citation statements)

References 157 publications

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“… 23 , 27 , 68 Thanks to the 2D nature of GaS flakes, electrons and holes are directly photogenerated at the interface with the electrolyte, where redox reactions take place before the charges recombine. 69 − 72 This last feature avoids the need for high-mobility active materials, which are instead mandatory for high-responsivity solid-state photodetectors. 70 , 73 , 74 …”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Gallium Sulfide Nanoflakes for UV-Selective Photoelectrochemical-type Photodetectors

et al. 2021

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Two-dimensional (2D) transition-metal monochalcogenides have been recently predicted to be potential photo(electro)catalysts for water splitting and photoelectrochemical (PEC) reactions. Differently from the most established InSe, GaSe, GeSe, and many other monochalcogenides, bulk GaS has a large band gap of ∼2.5 eV, which increases up to more than 3.0 eV with decreasing its thickness due to quantum confinement effects. Therefore, 2D GaS fills the void between 2D small-band-gap semiconductors and insulators, resulting of interest for the realization of van der Waals type-I heterojunctions in photocatalysis, as well as the development of UV light-emitting diodes, quantum wells, and other optoelectronic devices. Based on theoretical calculations of the electronic structure of GaS as a function of layer number reported in the literature, we experimentally demonstrate, for the first time, the PEC properties of liquid-phase exfoliated GaS nanoflakes. Our results indicate that solution-processed 2D GaS-based PEC-type photodetectors outperform the corresponding solid-state photodetectors. In fact, the 2D morphology of the GaS flakes intrinsically minimizes the distance between the photogenerated charges and the surface area at which the redox reactions occur, limiting electron–hole recombination losses. The latter are instead deleterious for standard solid-state configurations. Consequently, PEC-type 2D GaS photodetectors display a relevant UV-selective photoresponse. In particular, they attain responsivities of 1.8 mA W –1 in 1 M H 2 SO 4 [at 0.8 V vs reversible hydrogen electrode (RHE)], 4.6 mA W –1 in 1 M Na 2 SO 4 (at 0.9 V vs RHE), and 6.8 mA W –1 in 1 M KOH (at 1.1. V vs RHE) under 275 nm illumination wavelength with an intensity of 1.3 mW cm –2 . Beyond the photodetector application, 2D GaS-based PEC-type devices may find application in tandem solar PEC cells in combination with other visible-sensitive low-band-gap materials, including transition-metal monochalcogenides recently established for PEC solar energy conversion applications.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional Gallium Sulfide Nanoflakes for UV-Selective Photoelectrochemical-type Photodetectors

et al. 2021

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“…It implied that pristine PAE played an important role in promoting charge separation and transfer as well. 51 However, their photocatalytic activities would decrease when the PAE amount was over 10%, owing to agglomeration and low solubility. The reason may be further explained the enough conductive electron mediator could not connect to the large PAE additive, restricting the isolation of photoexcited electrons and holes.…”

Section: Results and Discussionmentioning

confidence: 99%

Arylene Ethynylene-Functionalized Bithiazole-Based Zinc Polymers for Ultraefficient Photocatalytic Activity

et al. 2019

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“…Its efficiency depends on the rational design of stable, efficient, and low-cost photocatalysts with visible-light responsivity. In essence, the critical problem lies in understanding photo-induced charge kinetics, including charge generation under photoexcitation (solar-light absorption), charge transfer to a catalyst surface (charge separation/migration), and charge consumption for redox reactions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Transition metal dichalcogenide-based mixed-dimensional heterostructures for visible-light-driven photocatalysis: Dimensionality and interface engineering

Gan

Lei

et al. 2020

Nano Res.

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Two-dimensional (2D) transition metal dichalcogenides (TMDCs) are emerging as promising building blocks of high-performance photocatalysts for visible-light-driven water splitting because of their unique physical, chemical, electronic, and optical properties. This review focuses on the fundamentals of 2D TMDC-based mixed-dimensional heterostructures and their unique properties as visible-light-driven photocatalysts from the perspective of dimensionality and interface engineering. First, we discuss the approaches and advantages of surface modification and functionalization of 2D TMDCs for photocatalytic water splitting under visible-light illumination. We then classify the strategies for improving the photocatalytic activity of 2D TMDCs via combination with various low-dimensional nanomaterials to form mixed-dimensional heterostructures. Further, we highlight recent advances in the use of these mixed-dimensional heterostructures as high-efficiency visible-light-driven photocatalysts, particularly focusing on synthesis routes, modification approaches, and physiochemical mechanisms for improving their photoactivity. Finally, we provide our perspectives on future opportunities and challenges in promoting real-world photocatalytic applications of 2D TMDC-based heterostructures.

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Two-dimensional layered nanomaterials for visible-light-driven photocatalytic water splitting

Cited by 84 publications

References 157 publications

Two-Dimensional Gallium Sulfide Nanoflakes for UV-Selective Photoelectrochemical-type Photodetectors

Two-Dimensional Gallium Sulfide Nanoflakes for UV-Selective Photoelectrochemical-type Photodetectors

Arylene Ethynylene-Functionalized Bithiazole-Based Zinc Polymers for Ultraefficient Photocatalytic Activity

Transition metal dichalcogenide-based mixed-dimensional heterostructures for visible-light-driven photocatalysis: Dimensionality and interface engineering

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