Construction of 2D S‐Scheme Heterojunction Photocatalyst

Advanced Materials, Год журнала: 2023, Номер 36(8)

Опубликована: Ноя. 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.

Язык: Английский

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S-scheme heterojunction photocatalysts for CO2 reduction

Matter, Год журнала: 2022, Номер 5(12), С. 4187 - 4211

Опубликована: Дек. 1, 2022

Язык: Английский

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Understanding the unique S-scheme charge migration in triazine/heptazine crystalline carbon nitride homojunction

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Июль 3, 2023

Understanding charge transfer dynamics and carrier separation pathway is challenging due to the lack of appropriate characterization strategies. In this work, a crystalline triazine/heptazine carbon nitride homojunction selected as model system demonstrate interfacial electron-transfer mechanism. Surface bimetallic cocatalysts are used sensitive probes during in situ photoemission for tracing S-scheme photogenerated electrons from triazine phase heptazine phase. Variation sample surface potential under light on/off confirms dynamic transfer. Further theoretical calculations an interesting reversal path light/dark conditions, which also supports experimental evidence transport. Benefiting unique merit electron transfer, shows significantly enhanced activity CO2 photoreduction. Our work thus provides strategy probe mechanisms design delicate material structures towards efficient

Язык: Английский

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Dislocated Bilayer MOF Enables High‐Selectivity Photocatalytic Reduction of CO₂ to CO

Advanced Materials, Год журнала: 2023, Номер 35(10)

Опубликована: Янв. 2, 2023

The highly selective photoreduction of CO2 into valuable small-molecule chemical feedstocks such as CO is an effective strategy for addressing the energy crisis and environmental problems. However, it remains a challenge because complex process usually generates multiple possible products requires subsequent separation step. In this paper, 2D monolayer bilayer porphyrin-based metal-organic frameworks (MOFs) are successfully constructed by adjusting reaction temperature solvent polarity with 5,10,15,20-tetrakis(4-pyridyl)porphyrin light-harvesting ligand. MOF low-dimensional special structure in which upper lower layers arranged dislocation bridged halogen ions. This exhibits 100% ultra-high selectivity reduction to under simulated sunlight without any cocatalyst or photosensitizer can be recycled at least three times. intrinsic mechanism photocatalytic explored through experimental characterization density functional theory (DFT) calculations. work shows that rational design number structures tune stability these opens new avenue photocatalysts.

Язык: Английский

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Recent advances of single-atom catalysts in CO₂conversion

Energy & Environmental Science, Год журнала: 2023, Номер 16(7), С. 2759 - 2803

Опубликована: Янв. 1, 2023

The catalytic transformation of CO 2 into valuable fuels/chemicals is a promising and economically profitable process because it offers an alternative toward fossil feedstocks the benefit transforming cycling on scale-up.

Язык: Английский

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Tunable Interfacial Charge Transfer in a 2D–2D Composite for Efficient Visible‐Light‐Driven CO₂ Conversion

Advanced Materials, Год журнала: 2023, Номер 35(26)

Опубликована: Март 25, 2023

Photocatalytic CO2 conversion for hydrocarbon fuel production has been known as one of the most promising strategies achieving carbon neutrality. Yet, its efficiency remains unsatisfactory mainly due to severe charge-transfer resistance and slow charge kinetics. Herein, a tunable interfacial transfer on an oxygen-vacancies-modified bismuth molybdate nanoflower assembled by 2D nanosheets (BMOVs) bismuthene composite (Bi/BMOVs) is demonstrated photocatalytic conversion. Specifically, meticulous design Ohmic contact formed between BMOVs can allow modulation resistance. According density functional theory (DFT) simulations, it ascertained that such exceptional kinetics attributed built-in electric field (IEF) contact. As such, reduction performance optimized Bi/BMOVs (CO CH4 productions rate 169.93 4.65 µmol g-1 h-1 , respectively) ca. 10 times higher than pristine BMO rates 16.06 0.51 respectively). The reported in this work shed some important light highly efficient photocatalysts both energy environmental applications.

Язык: 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, Год журнала: 2023, Номер 62(50)

Опубликована: Ноя. 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.

Язык: Английский

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

Chemical Communications, Год журнала: 2022, Номер 59(6), С. 688 - 699

Опубликована: Дек. 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.

Язык: Английский

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Interfacial oxygen vacancies at Co3O4-CeO2 heterointerfaces boost the catalytic reduction of NO by CO in the presence of O2

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 323, С. 122151 - 122151

Опубликована: Ноя. 9, 2022

Язык: Английский

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Research on cobalt-doping sites in g-C3N4 framework and photocatalytic reduction CO2 mechanism insights

Journal of Alloys and Compounds, Год журнала: 2023, Номер 954, С. 170044 - 170044

Опубликована: Апрель 12, 2023

Язык: Английский

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