A review of metal oxide-based Z-scheme heterojunction photocatalysts: actualities and developments

Yuan, Ye; Guo, Rui‐tang; Hong, Long-fei; Ji, Xiang-yin; Lin, Zhidong; Li, Zhengsheng; Pan, Weiguo

doi:10.1016/j.mtener.2021.100829

Cited by 144 publications

(78 citation statements)

References 215 publications

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“…S‐scheme, also known as step‐scheme, is associated with a reducing photocatalyst with higher Fermi level and smaller work function and an oxidizing photocatalyst with lower Fermi level and larger work function, which delivers a migration pathway analogous to a “step” from low CB to high CB. In contrast to Z‐scheme that could occur in either liquid‐phase or all‐solid‐state system, S‐scheme is limited to powder photocatalysts, with both being n‐type semiconductors 230 . In another context, Ye's group has highlighted the advantage of p‐n heterojunction as compared with Z‐scheme and type‐II structures, where the built‐in electric field has further prompted the charge carrier migration 231 …”

Section: Znin2s4‐based Photocatalysts For Hydrogen Evolution Reaction...mentioning

confidence: 99%

“…In contrast to Z-scheme that could occur in either liquid-phase or all-solid-state system, S-scheme is limited to powder photocatalysts, with both being n-type semiconductors. 230 In another context, Ye's group has highlighted the advantage of p-n heterojunction as compared with Z-scheme and type-II structures, where the built-in electric field has further prompted the charge carrier migration. 231 While seeking for an appropriate material for heterojunction construction, the charge transfer mechanism is a major area that should not be overlooked.…”

Section: P-n Heterojunctionmentioning

confidence: 99%

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Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

Ong

2022

EcoMat

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The gradual depletion of fossil fuel reserves that contribute to $85% of global energy production and release of toxic effluents urges the transformation toward renewable fuels. Thus, the sustainable utilization of sunlight for water splitting and CO 2 reduction with heterogeneous photocatalysts has come to light. As a semiconductor photocatalyst, ZnIn 2 S 4 has hit the limelight owing to its narrow bandgap and visible-light-responsive properties. However, the limitations of ZnIn 2 S 4 include limited active sites, fast charge-carrier recombination, and low photoconversion efficiency. Beginning from the fundamental photocatalytic mechanism, this review then provides in-depth insights into several modification strategies of ZnIn 2 S 4 , extending from defect engineering, facet engineering, cocatalyst loading to junction engineering, enabling the synergistic construction of high-performance ZnIn 2 S 4 -based systems. Subsequently, the structure-performance relation of ZnIn 2 S 4 -based photocatalysts for hydrogen evolution (HER), overall water splitting (OWS), and CO 2 reduction applications in the last 4 years will be discussed and concluded by the future perspectives of this frontier.

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Section: Znin2s4‐based Photocatalysts For Hydrogen Evolution Reaction...mentioning

confidence: 99%

Section: P-n Heterojunctionmentioning

confidence: 99%

Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

Ong

2022

EcoMat

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“…The creation of a “junction” when various semiconductors are in proximity is referred to as heterojunction. The spatial potential difference on both sides of the junction is favorable for the separation of light‐induced carriers, which enhances photocatalytic activity sequentially 79,80 . Developing a semiconductor heterojunction is an excellent way to create super‐efficient photocatalytic activity among the methods mentioned 81,82 .…”

Section: Techniques To Enhance the Catalyst Activitymentioning

confidence: 99%

“…The spatial potential difference on both sides of the junction is favorable for the separation of light-induced carriers, which enhances photocatalytic activity sequentially. 79,80 Developing a semiconductor heterojunction is an excellent way to create super-efficient photocatalytic activity among the methods mentioned. 81,82 When heterojunctions are made up of different semiconductor materials with identical band possibilities to form type-II heterojunctions or type-I by realigning the excited photo-generated holes and electrons, the energy level, can be moved from one semi-conductor to another in opposite directions, determined by the shaped built-in electric fields, improving photocatalytic performance.…”

Section: Heterojunction Formationmentioning

confidence: 99%

An inclusive perspective on the recent development of tungsten‐based catalysts for overall water‐splitting : A review

Abdullah

Ali

Pervaiz

et al. 2022

Intl J of Energy Research

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Summary The problems of energy shortages, environmental pollution and the ever‐increasing global population are creating serious concerns for mankind. For a sustainable future, it is essential to explore clean and renewable alternate energy sources. The green energy consumption model aims towards a future with a competent and sustainable hydrogen economy to fulfill the global energy demands. Water‐splitting is a promising method for clean hydrogen production. A highly active noble metal‐free catalyst is the main pre‐requisite, to make the process energy‐efficient and economical. An optimum catalyst lowers the energy required for the disassociation of water by driving down the overpotential of the process. Tungsten‐based materials are an considered effective catalyst for water‐splitting due to natural availability, environmental friendliness, high photostability, high electron mobility, large hole diffusion length and high catalytic activities. In recent years, a diverse range of tungsten‐based materials has been developed as photo/electro catalysts for water‐splitting. This review aims to present a comprehensive understanding and timely reference for the progress of tungsten‐based catalysts in this field. This study begins with the fundamental principle of water splitting and the properties of tungsten and its hybrids then moves on to different techniques for producing binary/ternary nanocomposites for overall water splitting. A comprehensive overview of the recent developments in tungsten‐based photo/electro catalysts for overall water splitting is then presented with the techniques to enhance the catalyst activity, such as morphological control, surface modification, heteroatom doping, and heterojunction construction. Finally, recommendations for the future are proposed.

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“…Among these attempts is the use of materials with heterogeneous interactions, which showed a significant improvement in the decomposition of dyes. Substances based on heterojunctions and activators play a vital role in enhancing the photocatalytic activity in the degradation of dyes [22].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of NiO-Ga2O2-Graphene Heterostructures on Congo Red Photodegradation in Water

2022

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We studied the effect of the mixed phase of nickel oxide–gallium oxide–graphene (NiO-Ga2O2/G) heterostructure nanocomposite on the photocatalytic degradation of Congo red dye. The effect was investigated based on NiO-Ga2O2 junction, NiO-graphene, and Ga2O2-graphene contacts. The laser-induced graphene was embedded into NiO and NiO-Ga2O2. Raman spectra confirmed the fabrication of disordered graphene and the mixed phase between the oxides and graphene. HRTEM showed that very fine nanoparticles for both NiO and Ga2O2 with a size of ~7–10 nm were synthesized. Elemental compositional expressed the formation mixed phase. The effect of graphene content was investigated at 2 and 10% wt with NiO and the heterojunction of NiO-Ga2O2. The photocurrent studies was measured of these nanocomposite film deposited on two interdigitated gold electrodes, biased by 5.0 V and irradiated by the UV source. The results of photocatalysis measurements indicated an improvement occurred upon the heterojunction between Ga2O2 and NiO, however, a dramatic improvement was observed with the addition of graphene of 10%. The results expressed that the ternary phase of p-NiO/n-Ga2O2/graphene is promising in the photocatalytic application toward Congo red decomposition.

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A review of metal oxide-based Z-scheme heterojunction photocatalysts: actualities and developments

Cited by 144 publications

References 215 publications

Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

An inclusive perspective on the recent development of tungsten‐based catalysts for overall water‐splitting : A review

Synergistic Effect of NiO-Ga2O2-Graphene Heterostructures on Congo Red Photodegradation in Water

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A review of metal oxide-based Z-scheme heterojunction photocatalysts: actualities and developments

Cited by 144 publications

References 215 publications

Shining light on ZnIn2S4 photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

Shining light on ZnIn2S4 photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

An inclusive perspective on the recent development of tungsten‐based catalysts for overall water‐splitting : A review

Synergistic Effect of NiO-Ga2O2-Graphene Heterostructures on Congo Red Photodegradation in Water

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Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis

Shining light on ZnIn₂S₄ photocatalysts: Promotional effects of surface and heterostructure engineering toward artificial photosynthesis