Synthesis and modification strategies of g-C3N4 nanosheets for photocatalytic applications

Advanced Powder Materials, Journal Year: 2023, Volume and Issue: 3(1), P. 100150 - 100150

Published: July 5, 2023

Graphitic carbon nitride nanosheets (CNNs) become the most promising member in family benefitted from their two-dimensional structural features. Recently, great endeavors have been made synthesis and modification of CNNs to improve photocatalytic properties, many exciting progresses gained. In order elucidate fundamentals based catalysts provide insights into rational design photocatalysis system, we describe recent progress preparation strategies applications this review. Firstly, physicochemical properties are briefly introduced. Secondly, approaches reviewed, including top-down stripping (thermal, gas, liquid, composite stripping) bottom-up precursor molecules (solvothermal, template, supramolecular self-assembly method). Subsequently, on years discussed, crystal structure design, doping, surface functionalization, constructing 2D heterojunction, anchoring single-atom. Then multifunctional g-C3N4 nanosheet materials H2 evolution, O2 overall water splitting, H2O2 production, CO2 reduction, N2 fixation, pollutant removal, organic synthesis, sensing highlighted. Finally, opportunities challenges for development high-performance systems also promising.

Language: Английский

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Defect and nanostructure engineering of polymeric carbon nitride for visible-light-driven CO2 reduction

Chinese Journal of Structural Chemistry, Journal Year: 2024, Volume and Issue: 43(3), P. 100245 - 100245

Published: Feb. 5, 2024

Language: Английский

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Mechanism insight into enhanced photocatalytic hydrogen production by nitrogen vacancy-induced creating built-in electric field in porous graphitic carbon nitride nanosheets

Applied Surface Science, Journal Year: 2023, Volume and Issue: 631, P. 157544 - 157544

Published: May 19, 2023

Language: Английский

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Circumventing bottlenecks in H2O2 photosynthesis over carbon nitride with iodine redox chemistry and electric field effects

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: June 3, 2024

Abstract Artificial photosynthesis using carbon nitride (g-C 3 N 4 ) holds a great promise for sustainable and cost-effective H 2 O production, but the high carrier recombination rate impedes its efficiency. To tackle this challenge, we propose an innovative method involving multispecies iodine mediators (I − /I intercalation through pre-photo-oxidation process potassium iodide (suspected deteriorated “KI”) within g-C framework. Moreover, introduce external electric field by incorporating cationic methyl viologen ions to establish auxiliary electron transfer channel. Such unique design drastically improves separation of photo-generated carriers, achieving impressive production 46.40 mmol g −1 h under visible light irradiation, surpassing most visible-light -producing systems. Combining various advanced characterization techniques elucidates inner photocatalytic mechanism, application potential system is validated with simulation scenarios. This work presents significative strategy preparing applying highly efficient -based catalysts in photochemical production.

Language: Английский

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Synergy between palladium single atoms and small nanoparticles co-anchored on carbon atom self-doped graphitic carbon nitride boosting photocatalytic H2 generation

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 345, P. 123680 - 123680

Published: Jan. 2, 2024

Language: Английский

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Salt-assisted construction of hydrophilic carbon nitride photocatalysts with abundant water molecular adsorption sites for efficient hydrogen production

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 350, P. 123902 - 123902

Published: April 24, 2024

Language: Английский

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Defect Engineering Simultaneously Regulating Exciton Dissociation in Carbon Nitride and Local Electron Density in Pt Single Atoms Toward Highly Efficient Photocatalytic Hydrogen Production

Small, Journal Year: 2024, Volume and Issue: 20(34)

Published: April 10, 2024

Abstract The high exciton binding energy ( E b ) and sluggish surface reaction kinetics have severely limited the photocatalytic hydrogen production activity of carbon nitride (CN). Herein, a hybrid system consisting nitrogen defects Pt single atoms is constructed through facile self‐assembly photodeposition strategy. Due to acceleration dissociation regulation local electron density along with introduction defects, optimized Pt‐MCT‐3 exhibits rate 172.0 µmol h −1 λ ≥ 420 nm), ≈41 times higher than pristine CN. apparent quantum yield for determined be 27.1% at nm. experimental characterizations theoretical calculations demonstrate that act as traps dissociation, resulting in decrease from 86.92 43.20 meV. Simultaneously, stronger interaction between neighboring directionally drives free electrons aggregate around atoms, tailors d ‐band Pt, forming moderate strength H* intermediates.

Language: Английский

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Strengthened H₂O adsorption and photogenerated carrier separation: surface C-coupled hydroxylation of g-C₃N₄ photocatalysts for efficient H₂ production

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(8), P. 4854 - 4865

Published: Jan. 1, 2024

C-coupled hydroxylated g-C 3 N 4 was fabricated via a facile method for efficient photocatalytic hydrogen evolution.

Language: Английский

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Overcoming Defect Limitations in Photocatalysis: Boron‐Incorporation Engineered Crystalline Red Phosphorus for Enhanced Hydrogen Production

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(29)

Published: Feb. 26, 2024

Abstract Photocatalytic hydrogen evolution (PHE) from water splitting is a promising technology for clean and renewable energy production. Elemental crystalline red phosphorus (CRP) purposefully designed developed PHE reaction. However, the photocatalytic activity of CRP limited by its intrinsic P vacancy (V ) defects, which lead to detrimental charge trapping at deep states hence severe recombination. To address this issue, boron (B) incorporated (B‐CRP) photocatalyst tailored, synthesized via simple mild boric acid‐assisted hydrothermal strategy. The incorporation B effectively fills V reducing trap (DTS) introducing beneficial shallow (STS) within band structure CRP. This defect engineering approach leads enhanced activity, with B‐CRP achieving rate 1392 µmol g −1 h , significantly outperforming most reported elemental photocatalysts in literature. Density functional theory (DFT) simulations ultrafast spectroscopy support constructive role B‐dopant‐induced STS prolonging active carrier lifetimes, promoting more efficient reactions. findings not only demonstrate effectiveness as but also highlight usefulness dopant‐induced advancing technologies.

Language: Английский

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Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(1), P. 784 - 794

Published: Jan. 2, 2024

Highly crystalline carbon nitride (CCN), benefiting from the reduced structural imperfections, enables improved electron-hole separation. Yet, phase with insufficient inherent defects suffers a poor performance toward reaction intermediate adsorption respect to amorphous phase. Herein, crystalline-amorphous (CACN) an isotype structure was constructed via two-step adjacent calcination strategy. Through specific oxygen etching and crystallization, formation of built-in electric field at interface could drive charge transfer separation, thus promoting photoredox reaction. As expected, optimized CACN exhibited H

Language: Английский

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