An Inorganic/Organic S‐Scheme Heterojunction H₂‐Production Photocatalyst and its Charge Transfer Mechanism

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(22)

Published: April 26, 2021

Abstract Inspired by natural photosynthesis, constructing inorganic/organic heterojunctions is regarded as an effective strategy to design high‐efficiency photocatalysts. Herein, a step (S)‐scheme heterojunction photocatalyst prepared in situ growth of inorganic semiconductor firmly on organic semiconductor. A new pyrene‐based conjugated polymer, pyrene‐ alt ‐triphenylamine (PT), synthesized via the typical Suzuki–Miyaura reactions, and then employed substrate anchor CdS nanocrystals. The optimized CdS/PT composite, coupling 2 wt% PT with CdS, exhibits robust H evolution rate 9.28 mmol h −1 g continuous release bubbles, well high apparent quantum efficiency 24.3%, which ≈8 times that pure CdS. S‐scheme charge transfer mechanism between systematically demonstrated photoirradiated Kelvin probe measurement irradiated X‐ray photoelectron spectroscopy analyses. This work provides protocol for preparing specific photocatalysts basis coupling.

Language: Английский

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Dual‐Single‐Atom Tailoring with Bifunctional Integration for High‐Performance CO₂ Photoreduction

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(49)

Published: Oct. 7, 2021

Single-atom photocatalysis has been demonstrated as a novel strategy to promote heterogeneous reactions. There is diversity of monoatomic metal species with specific functions; however, integrating representative merits into dual-single-atoms and regulating cooperative remain pressing challenge. For dual-single-atom catalysts, enhanced photocatalytic activity would be realized through bifunctional properties tuning the synergistic effect. Herein, supported on conjugated porous carbon nitride polymer are developed for effective CO2 reduction, featuring function cobalt (Co) ruthenium (Ru). A series in situ characterizations theoretical calculations conducted quantitative analysis structure-performance correlation. It concluded that active Co sites facilitate dynamic charge transfer, while Ru selective surface-bound interaction during photoreduction. The combination atom-specific traits synergy between lead high conversion corresponding apparent quantum efficiency (AQE) 2.8% at 385 nm, along turnover number (TON) more than 200 without addition any sacrificial agent. This work presents an example identifying roles different single-atom metals synergy, where two unique collaborate further boost performance.

Language: Английский

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Review on g-C3N4-based S-scheme heterojunction photocatalysts

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 125, P. 128 - 144

Published: April 18, 2022

Language: Английский

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g‐C₃N₄‐Based 2D/2D Composite Heterojunction Photocatalyst

Small Structures, Journal Year: 2021, Volume and Issue: 2(12)

Published: Sept. 16, 2021

Employing semiconductor photocatalysis to transform solar energy into chemical provides a practicable strategy for the alleviation of and environmental crisis. Graphitic carbon nitride (g‐C 3 N 4 ) is popular 2D photocatalyst with numerous advantages, such as visible light response, low cost, high stability. However, single g‐C displays poor performance due fast recombination photogenerated electrons holes. To improve this limitation, many research works have focused on construction ‐based 2D/2D heterojunction photocatalysts by hybridizing other materials. The intimate face‐to‐face contact in offers large area plentiful channels migration separation charge carriers. Furthermore, inherits strengths structure, including specific surface area, abundant adsorption sites active sites. Herein, preparation, mechanism, application are reviewed. Three common preparation methods summarized, solid phase reaction, situ growth, electrostatic self‐assembly. Various photocatalytic mechanisms discussed, traditional type‐II, Z‐scheme S‐scheme mechanisms. A series applications environment fields illustrated. Finally, future directions development proposed.

Language: Английский

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Crystalline Intramolecular Ternary Carbon Nitride Homojunction for Photocatalytic Hydrogen Evolution

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(11), P. 6345 - 6358

Published: May 12, 2022

The construction of intramolecular homojunction in the carbon nitride framework is one advantageous methods to improve photocatalytic performance. Based on molecular self-assembly strategy form homojunction, showed enhanced activity. However, disordered structure pristine g-C3N4 obtained using traditional approach inhibits dissociation and migration photocarriers. Here, we adopt a method prepare crystalline C3N4 (HCCN) with functional group modifications ternary by multistep thermal polymerization. band indicates that cyano cyanamide-based units HCCN samples have different highest occupied orbital/lowest unoccupied orbital energy levels, which constitute special through arrangement levels an internal electron field molecule. analysis photoelectron–hole pairs performance confirms accelerates interface charge transfer reduces reverse recombination. Moreover, compact greatly improves photogenerated charges. Femtosecond transient absorption spectra explain trajectory carrier kinetics confirm crystal semiconductor modified groups can promote excitons free This research provides idea obtain homojunctions.

Language: Английский

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EPR Investigation on Electron Transfer of 2D/3D g‐C₃N₄/ZnO S‐Scheme Heterojunction for Enhanced CO₂ Photoreduction

Advanced Sustainable Systems, Journal Year: 2021, Volume and Issue: 6(1)

Published: Oct. 8, 2021

Abstract Photocatalytic conversion of CO 2 into useful products is a promising technology from environmental and economic viewpoints. However, the efficiency current photocatalytic materials still unsatisfactory. In this work, robust S‐scheme heterojunction composed 3D ZnO hollow spheres wrapped by 2D g‐C 3 N 4 layers fabricated. The electrostatic attraction between both components not only facilitates exfoliation but also strengthens photocatalyst framework. prepared /ZnO afforded an enhanced CH production rate, which ≈40 7 times higher than those pure , respectively. improved activity attributed to extended light absorption suppressed charge carrier recombination. Moreover, apart traditional techniques, electron paramagnetic resonance (EPR) used probe movement in fabricated heterojunction. An observable shift relevant EPR peak noticed after construction heterostructure, indicating transfer process. This study sheds on heterojunctions as efficient candidates for conversion.

Language: Английский

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Copper and platinum dual-single-atoms supported on crystalline graphitic carbon nitride for enhanced photocatalytic CO2 reduction

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2022, Volume and Issue: 43(2), P. 451 - 460

Published: Jan. 17, 2022

Language: Английский

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Steering the behavior of photogenerated carriers in semiconductor photocatalysts: a new insight and perspective

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(42), P. 23765 - 23782

Published: Jan. 1, 2021

The current semiconductor photocatalysts only exhibit unsatisfactory photocatalytic efficiency, due to the easy recombination of photogenerated carriers. Regulating separation and transfer carriers reducing are essential for improving catalytic efficiency photocatalysts. is produced by attraction Coulomb force. Consequently, requires an additional driving force counteract However, exploring mechanism carrier regulation from perspective has received sporadic attention. This review firstly starts fundamental impairment performance. Then it focuses on several main strategies regulating behavior aspect carriers, including heterojunction design，construction intramolecular donor-acceptor (D-A) system, exciton regulation, electron spin regulation. Subsequently, advanced characterization techniques latest developments theoretical calculations migration have been introduced. In end, we summarize challenges put forward prospects future development

Language: Английский

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Targeted regulation of exciton dissociation in graphitic carbon nitride by vacancy modification for efficient photocatalytic CO2 reduction

Applied Catalysis B Environment and Energy, Journal Year: 2021, Volume and Issue: 292, P. 120179 - 120179

Published: April 5, 2021

Language: Английский

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MOFs-based S-scheme heterojunction photocatalysts

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 504, P. 215674 - 215674

Published: Jan. 23, 2024

Language: Английский

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