S-scheme heterojunction in photocatalytic hydrogen production

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 169, P. 82 - 104

Published: June 11, 2023

Language: Английский

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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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Verifying the Charge‐Transfer Mechanism in S‐Scheme Heterojunctions Using Femtosecond Transient Absorption Spectroscopy

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(8)

Published: Dec. 29, 2022

The S-scheme heterojunction is flourishing in photocatalysis because it concurrently realizes separated charge carriers and sufficient redox ability. Steady-state transfer has been confirmed by other methods. However, an essential part, the dynamics heterojunctions, still missing. To compensate, a series of cadmium sulfide/pyrene-alt-difluorinated benzothiadiazole heterojunctions were constructed photophysical processes investigated with femtosecond transient absorption spectroscopy. Encouragingly, interfacial charge-transfer signal was detected spectra heterojunction, which provides solid evidence for to complement results from well-established Furthermore, lifetime calculated be ca. 78.6 ps. Moreover, photocatalysts exhibit higher photocatalytic conversion 1,2-diols H2 production rates than bare sulfide.

Language: Английский

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Insight into synergistic effect of Ti3C2 MXene and MoS2 on anti-photocorrosion and photocatalytic of CdS for hydrogen production

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 330, P. 122653 - 122653

Published: March 17, 2023

Language: Английский

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In Situ Synthesis of Chemically Bonded 2D/2D Covalent Organic Frameworks/O‐Vacancy WO₃ Z‐Scheme Heterostructure for Photocatalytic Overall Water Splitting

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(33)

Published: June 15, 2023

Abstract Covalent organic frameworks (COFs) have shown great promise for photocatalytic hydrogen evolution via water splitting. However, the four‐electron oxidation of remains elusive toward oxygen evolution. Enabling this pathway is critical to improve yield and maximize atom utilization efficiency. A Z‐scheme heterojunction proposed overcoming fundamental issues in COF‐based overall splitting (OWS), such as inefficient light absorption, charge recombination, poor ability. It that construction a novel 2D/2D through situ growth COFs on O‐vacancy WO 3 nanosheets (Ov‐WO ) WOC chemical bond can remarkably promote OWS. Benefiting from synergistic effect between enhanced built‐in electric field by interfacial bond, strong ability Ov‐WO 3, ultrathin structure TSCOF, both separation efficiency photogenerated electron–hole pairs be significantly enhanced. An impressive half‐rection rate 593 mmol h −1 g 146 (hydrogen) 68 (oxygen) µmol are achieved COF‐WO (TSCOFW) composite. This with two‐step excitation precisely cascaded charge‐transfer makes it responsible efficient solar‐driven OWS without sacrificial agent.

Language: Английский

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ZnIn2S4-based S-scheme heterojunction photocatalyst

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 167, P. 184 - 204

Published: June 28, 2023

Language: Английский

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Rapid Charge Transfer Endowed by Interfacial Ni‐O Bonding in S‐scheme Heterojunction for Efficient Photocatalytic H₂ and Imine Production

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(50)

Published: Nov. 1, 2023

Cooperative coupling of H2 evolution with oxidative organic synthesis is promising in avoiding the use sacrificial agents and producing hydrogen energy value-added chemicals simultaneously. Nonetheless, photocatalytic activity obstructed by sluggish electron-hole separation limited redox potentials. Herein, Ni-doped Zn0.2 Cd0.8 S quantum dots are chosen after screening DFT simulation to couple TiO2 microspheres, forming a step-scheme heterojunction. The configuration tunes highly active site for augmented evolution, interfacial Ni-O bonds provide fast channels at atomic level lower barrier charge transfer. Also, calculations reveal an enhanced built-in electric field heterojunction superior migration separation. Kinetic analysis femtosecond transient absorption spectra demonstrates that expedited electrons first transfer Ni2+ then sites. Therefore, designed catalyst delivers drastically elevated yield (4.55 mmol g-1 h-1 ) N-benzylidenebenzylamine production rate (3.35 ). This work provides atomic-scale insights into coordinated modulation sites fields ameliorative performance.

Language: Английский

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Femtosecond transient absorption spectroscopy investigation into the electron transfer mechanism in photocatalysis

Chemical Communications, Journal Year: 2022, Volume and Issue: 59(6), P. 688 - 699

Published: Dec. 21, 2022

This feature article introduces the basic principles of femtosecond transient absorption spectroscopy (fs-TAS) and recent advances in application fs-TAS to heterojunction photocatalysts.

Language: Английский

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Metal-sulfide-based heterojunction photocatalysts: Principles, impact, applications, and in-situ characterization

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2023, Volume and Issue: 49, P. 42 - 67

Published: June 1, 2023

Language: Английский

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Verifying the Charge‐Transfer Mechanism in S‐Scheme Heterojunctions Using Femtosecond Transient Absorption Spectroscopy

Angewandte Chemie, Journal Year: 2022, Volume and Issue: 135(8)

Published: Dec. 29, 2022

Abstract The S‐scheme heterojunction is flourishing in photocatalysis because it concurrently realizes separated charge carriers and sufficient redox ability. Steady‐state transfer has been confirmed by other methods. However, an essential part, the dynamics heterojunctions, still missing. To compensate, a series of cadmium sulfide/pyrene‐ alt ‐difluorinated benzothiadiazole heterojunctions were constructed photophysical processes investigated with femtosecond transient absorption spectroscopy. Encouragingly, interfacial charge‐transfer signal was detected spectra heterojunction, which provides solid evidence for to complement results from well‐established Furthermore, lifetime calculated be ca. 78.6 ps. Moreover, photocatalysts exhibit higher photocatalytic conversion 1,2‐diols H 2 production rates than bare sulfide.

Language: Английский

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