Review on Metal Sulphide‐based Z‐scheme Photocatalysts

Di, Tingmin; Xu, Quanlong; Ho, Wingkei; Tang, Hua; Xiang, Quanjun; Wang, Yuanyuan

doi:10.1002/cctc.201802024

Cited by 452 publications

(183 citation statements)

References 151 publications

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“…Solar‐driven hydrogen production from water has been identified as one of environmentally friendly strategies to tackle grand challenges like energy shortage and environment pollution . Since Fujishima and Honda first reported TiO 2 photoelectrochemical water splitting in 1972, the past decades have seen a significant rise in solar‐driven water splitting .…”

Section: Introductionmentioning

confidence: 99%

Unraveling Photoexcited Charge Transfer Pathway and Process of CdS/Graphene Nanoribbon Composites toward Visible‐Light Photocatalytic Hydrogen Evolution

Xia

Cheng

Fan

et al. 2019

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270

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201902459. 1-10 wt% GNRs, the CdS/GNR composites with 2 wt% GNRs achieves the greatest hydrogen evolution rate of 1.89 mmol h −1 g −1 . The corresponding apparent quantum efficiency is 19.3%, which is ≈3.7 times higher than that of pristine CdS NPs. To elucidate the underlying photocatalytic mechanism, a systematic characterization, including in situ irradiated X-ray photoelectron spectroscopy and Kelvin probe measurements, is performed. In particular, the interfacial charge transfer pathway and process from CdS NPs to GNRs is revealed. This work may open avenues to fabricate GNR-based nanocomposites for solar-to-chemical energy conversion and beyond.

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Section: Introductionmentioning

confidence: 99%

Unraveling Photoexcited Charge Transfer Pathway and Process of CdS/Graphene Nanoribbon Composites toward Visible‐Light Photocatalytic Hydrogen Evolution

Xia

Cheng

Fan

et al. 2019

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270

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“…In the past decade, apart from typical charge transfer mechanism, Z‐scheme‐based charge transfer mechanism has achieved immense popularity in the field of photocatalysis because of robust redox ability of photoinduced charge carriers. The greatly improved charge separation efficiency in the Z‐scheme system is because of the availability of most oxidative electrons and reducible holes in the higher conduction band and lower valence band of the respective combining entity . Furthermore, such systems utilize solar light more competently as compared to single‐component‐based semiconductor photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of a Coupled Confronting Z‐Scheme System Toward Photocatalytic Refractory Pollutant Degradation and Water Splitting Reaction

Kandi

Sahoo

Martha

et al. 2019

Adv Materials Inter

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photocatalyst. In this context, there are several reported works on Z-scheme-based semiconductors such as CdS/BiVO 4 , [2] BiVO 4 /CdS quantum dots (QDs), [3] CdS-WO 3 , [4] TiO 2 /CdS, [5] etc. Yet, the typical charge transfer process competes with the binary Z-scheme charge transfer and the photocatalytic performance is still unable to triumph the practical application, i.e., to conquer the concerns of sustainable energy and environment-related issues. Understandably then, scientists started focusing on the construction of ternary semiconductors with dual Z-scheme pathway for more effective charge separation. Many research groups have reported their findings in designing unidirectional double Z-scheme-based photocatalysts for water redox reactions and degradation of harmful pollutants. [6][7][8][9][10][11] Moreover, our group has reported photocatalytic reduction of Cr 6+ → Cr 3+ and water → H 2 over Cu-MoO 3 /g-C 3 N 4 hybrid nanocomposite. [6] Ternary Ag 2 CO 3 /CeO 2 /AgBr photocatalyst has been reported by Wen et al. with double Z-scheme configuration performing photodegradation of levofloxacin. [7] GO/Ag 2 CrO 4 /g-C 3 N 4 nanocomposite has been reported with superior photocatalytic performance toward refractory pollutant degradation [8] and AgBr@Bi 2 WO 6 /WO 3 for degrading rhodamine B. [9] A similar double Z-scheme photocatalytic system (Bi 2 S 3 /SnS 2 /Bi 2 O 3 ) has also been reported by Yu et al. for dye removal under sunlight irradiation. [10] ZnO/ZnS/g-C 3 N 4 ternary double Z-scheme heterojunction has been synthesized by Dong et al. for photocatalytic H 2 generation. [11] Despite accomplishments of certain stimulating achievements by these double Z-scheme photocatalysts, still improvements can be attained to scale up the practical application in the photocatalytic field. We report here a prototype novel confronting bidirectional double Z-schemebased UV-vis active photocatalyst with two single Z-scheme systems acting in opposite direction toward enhanced photocatalytic water oxidation reaction (WOR) and organic pollutants, i.e., tetracycline (TC) and methyl orange (MO). It consists of an oxygen evolution catalyst, i.e., BiVO 4 abbreviated as "B" (monoclinic clinobisvanite phase) composed of tetrahedron and octahedron of VO 4 and BiO 8 , respectively, with threefold coordinated O, fourfold coordinated V, and eightfold coordinated Bi. This phase of B collects distinct attention in WORs Fabricating competent nanoarchitecture photocatalytic systems with desired band edge potential is crucial for effective charge separation that manifolds photocatalytic action. Here, a prototype pristine rational design of allsolid-state coupled confronting Z-scheme (CCZ) system is synthesized by coprecipitation and hydrothermal method. This proof of concept comprises BiVO 4 (B) and MgAl layered double hydroxide (L) as photosystem II (PS-II) whereas CdS quantum dots (QDs, C) as photosystem I (PS-I). CdS QDs trigger H 2 production that subsequently boosts O 2 production at PS-II. Furthermore, this rare CCZ system shows ...

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“…Formation of heterostructure, especially Z‐scheme semiconductor heterostructure, is an effectively way to promote the separation of charge carriers and remain efficient redox process, thereby promoting the photocatalytic activity . The valence band (VB) structure of ZnO and ZnS can be well matched to form a Z‐scheme heterostructure.…”

Section: Introductionmentioning

confidence: 99%

“…Formation of heterostructure, especially Z-scheme semiconductor heterostructure, is an effectively way to promote the separation of charge carriers and remain efficient redox process, thereby promoting the photocatalytic activity. [15][16]17,18,19] The valence band (VB) structure of ZnO and ZnS can be well matched to form a Z-scheme heterostructure. Actually, the conduction band (CB) edge potential of ZnO is À 0.31 eV, which is not negative enough to photocatalytic hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Construction of 2D‐ZnS@ZnO Z‐Scheme Heterostructured Nanosheets with a Highly Ordered ZnO Core and Disordered ZnS Shell for Enhancing Photocatalytic Hydrogen Evolution

et al. 2020

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Heterostructure and defects in photocatalyst play highly important role in photocatalysis. Formation of 2D‐ZnS@ZnO Z‐scheme heterostructure and introduction of zinc interstitial defects into ZnO were successfully achieved through a facile in‐situ ion‐exchange hydrothermal approach, and the photocatalysts exhibited high photocatalytic activity for hydrogen evolution. The heterointerface between the highly ordered ZnO core and disordered ZnS shell, and the zinc interstitial, facilitate the transfer and separation of charge carriers, resulting in high photocatalytic activity. The 2D‐ZnS@ZnO photocatalyst with a disordered ZnS layer of about 8 nm in thickness exhibited a photocurrent density about 7.2 times than that of ZnO, which is mainly attributed to the facilitative effect on interface transfer and the increased charge density. In addition, the photocatalytic activity can be adjusted via changing the thickness of the disordered ZnS overlayer. This work provides a strategy for the design of the heterointerface photocatalysts combined with defect engineering, through which the photocatalytic activity can be remarkably improved.

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Review on Metal Sulphide‐based Z‐scheme Photocatalysts

Cited by 452 publications

References 151 publications

Unraveling Photoexcited Charge Transfer Pathway and Process of CdS/Graphene Nanoribbon Composites toward Visible‐Light Photocatalytic Hydrogen Evolution

Unraveling Photoexcited Charge Transfer Pathway and Process of CdS/Graphene Nanoribbon Composites toward Visible‐Light Photocatalytic Hydrogen Evolution

Rational Design of a Coupled Confronting Z‐Scheme System Toward Photocatalytic Refractory Pollutant Degradation and Water Splitting Reaction

Construction of 2D‐ZnS@ZnO Z‐Scheme Heterostructured Nanosheets with a Highly Ordered ZnO Core and Disordered ZnS Shell for Enhancing Photocatalytic Hydrogen Evolution

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