Construction of 2D S‐Scheme Heterojunction Photocatalyst

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(8)

Published: Nov. 22, 2023

Abstract Semiconductor photocatalytic technology holds immense promise for converting sustainable solar energy into chemically storable energy, with significant applications in the realms of and environment. However, inherent issue rapid recombination photogenerated electrons holes hinders performance single photocatalysts. To overcome this challenge, construction 2D S‐scheme heterojunction photocatalysts emerges as an effective strategy. The deliberate design dimensionality ensures a substantial interfacial area; while, charge transfer mechanism facilitates efficient separation maximizes redox capabilities. This review commences fresh perspective on heterojunctions, followed by comprehensive exploration preparation methods characterization techniques. Subsequently, recent advancements are summarized. Notably, behind activity enhancement is elucidated. Finally, prospects development presented.

Language: Английский

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Highly Selective Photoconversion of CO₂ to CH₄ over SnO₂/Cs₃Bi₂Br₉ Heterojunctions Assisted by S-Scheme Charge Separation

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(19), P. 12623 - 12633

Published: Sept. 13, 2023

Exploring photocatalysts to promote the conversion of CO2 valuable chemical fuels is a highly promising approach for mitigating energy scarcity and environmental pollution. Lead-free perovskite Cs3Bi2Br9 quantum dots (QDs) have attracted considerable attention in photoreduction due robust reduction capability controllable product selectivity. Nevertheless, their potential has been impeded by rapid recombination charge carriers, leading unsatisfactory photocatalytic efficiency. Here, unique SnO2/Cs3Bi2Br9 S-scheme heterojunctions are constructed electrostatically self-assembling SnO2 nanofibers with QDs enhance performance. Density functional theory calculations, along experimental studies, reveal that electrons transfer from SnO2, creating directed interfacial electric field bending bands at interfaces. This facilitates transport photoelectrons Cs3Bi2Br9, forming enabling effective separation powerful photoexcited electron/hole pairs. Additionally, profiting enhanced light absorption contributed narrow-bandgap lower barrier CH4 production over surface, heterostructures unveil superior activities high selectivity 70%, without assistance any molecular catalyst or scavenger.

Language: Английский

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Research Progress on Photocatalytic CO₂ Reduction Based on Perovskite Oxides

Small, Journal Year: 2023, Volume and Issue: 19(38)

Published: May 17, 2023

Abstract Photocatalytic CO 2 reduction to valuable fuels is a promising way alleviate anthropogenic emissions and energy crises. Perovskite oxides have attracted widespread attention as photocatalysts for by virtue of their high catalytic activity, compositional flexibility, bandgap adjustability, good stability. In this review, the basic theory photocatalysis mechanism over perovskite oxide are first introduced. Then, oxides' structures, properties, preparations presented. detail, research progress on photocatalytic discussed from five aspects: photocatalyst in its own right, metal cation doping at A B sites oxides, anion O oxygen vacancies, loading cocatalyst constructing heterojunction with other semiconductors. Finally, development prospects put forward. This article should serve useful guide creating oxide‐based that more effective reasonable.

Language: Английский

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Ultrathin BiOCl-OV/CoAl-LDH S-scheme heterojunction for efficient photocatalytic peroxymonosulfate activation to boost Co (IV)=O generation

Water Research, Journal Year: 2024, Volume and Issue: 258, P. 121774 - 121774

Published: May 20, 2024

Language: Английский

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Boosting Artificial Photosynthesis: CO₂ Chemisorption and S-Scheme Charge Separation via Anchoring Inorganic QDs on COFs

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(3), P. 1951 - 1961

Published: Jan. 22, 2024

Photocatalytic conversion of CO2 into valuable hydrocarbon fuels holds great promise in addressing emerging energy shortages and environmental crises while fulfilling pressing societal national development demands. Nonetheless, its efficiency is hindered by restricted chemisorption, rapid electron–hole recombination, weak redox capability. Drawing inspiration from the distinctive characteristics Schiff-based covalent organic frameworks (COFs), including substantial specific surface area, unique pore structure, an abundance weakly alkaline nitrogen elements, we employ TPA-COF to enhance chemisorption activation acidic molecules, as validated CO2-temperature-programmed desorption analysis. Furthermore, anchoring CsPbBr3 quantum dots (QDs) onto COF facilitates effective spatial separation photoinduced charge carriers with strong capability, resulting formation S-scheme heterojunctions between QDs substantiated situ irradiation X-ray photoelectron spectroscopy, femtosecond transient absorption density functional theory simulations. As anticipated, optimized COF/QDs heterostructures exhibit remarkable enhancements photoreduction performance absence any molecule cocatalyst or scavenger, yielding CO CH4 at rates 41.2 13.7 μmol g–1, respectively. This work provides insights novel organic/inorganic heterojunction photocatalysts separation, offering potential for sustainable artificial photosynthesis.

Language: Английский

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Asymmetric Atomic Dual‐Sites for Photocatalytic CO₂ Reduction

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(38)

Published: July 23, 2024

Abstract Atomically dispersed active sites in a photocatalyst offer unique advantages such as locally tuned electronic structures, quantum size effects, and maximum utilization of atomic species. Among these, asymmetric dual‐sites are particular interest because their charge distribution generates local built‐in electric potential to enhance separation transfer. Moreover, the dual provide flexibility for tuning complex multielectron multireaction pathways, CO 2 reduction reactions. The coordination opens new possibilities engineering structure–activity–selectivity relationship. This comprehensive overview discusses efficient sustainable photocatalysis processes photocatalytic reduction, focusing on strategic active‐site design future challenges. It serves timely reference development conversion processes, specifically exploring here exemplified by into valuable chemicals.

Language: Английский

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S-scheme heterojunction photocatalysts based on 2D materials

Materials Today, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

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Unraveling the impact of Cu-doping in lead free halide perovskites for markedly enhancing photocatalytic CO2 reduction performance

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 340, P. 123247 - 123247

Published: Sept. 6, 2023

Language: Английский

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Potential of Bi2WO6-based heterojunction photocatalysts for environmental remediation

Materials Today Chemistry, Journal Year: 2023, Volume and Issue: 32, P. 101633 - 101633

Published: July 9, 2023

Language: Английский

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Recent advances in perovskite-based Z-scheme and S-scheme heterojunctions for photocatalytic CO2 reduction

Chemosphere, Journal Year: 2023, Volume and Issue: 339, P. 139765 - 139765

Published: Aug. 8, 2023

Language: Английский

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