Rational Design of Covalent Organic Frameworks for Photocatalytic Hydrogen Peroxide Production

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Abstract Photocatalytic production of hydrogen peroxide (H 2 O ) represents a significant approach to achieving sustainable energy generation through solar energy, addressing both shortages and environmental pollution. Among various photocatalytic materials, covalent organic frameworks (COFs) have gained widespread attention in‐depth research due their unique advantages, including high porosity, predesignability, atomic‐level tunability. In recent years, progress has been made in the development, performance enhancement, mechanistic understanding COF‐based photocatalysts. This review focuses on latest advancements H using COFs, particularly emphasizing rational design COF structures regulate catalytic exploring fundamental processes involved photocatalysis. Based current achievements this field, paper also discusses existing challenges future opportunities, aiming provide reference for application COFs production.

Language: Английский

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Tunable Ferroelectric Polarization in BaTiO₃ Coupled with Zn_0.5Cd_0.5S Quantum Dots for Efficient Solar‐Driven Hydrogen Evolution

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 23, 2025

Abstract Integrating ferroelectric materials with semiconductor photocatalysts offers a groundbreaking strategy to enhance solar‐driven hydrogen production by improving charge separation and transfer efficiency. Herein, synergistic system is developed coupling the tunable polarization of BaTiO 3 (BTO) Z‐scheme heterojunction in Zn 0.5 Cd S quantum dots (ZCS QDs). The strong adjustable built‐in electric field generated BTO effectively drives carrier separation, enhances interfacial band bending, mitigates excitonic effects commonly observed QDs, facilitating directional transfer. Mechanistic insights, validated situ X‐ray photoelectron spectroscopy (XPS) Kelvin Probe Force Microscopy (KPFM), highlight pivotal role modulating dynamics interactions. These attributes, resulting from heterojunction, enable ZCS QDs/BTO composite achieve an outstanding evolution rate 0.83 mmol g −1 h , surpassing pure QDs factors 20.8 1.7, respectively. Notably, external further amplifies 1.19 representing remarkable 143% increase compared pristine showcasing polarization‐enhanced fields photocatalysis. This work presents novel pathway for designing advanced photocatalysts, providing promising prospects sustainable production.

Language: Английский

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Construction of Sulfur-Vacancy-Modified 0D/2D S-Scheme Heterojunction for Enhancing Photocatalytic Cr(VI) Reduction

ACS Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 566 - 575

Published: Jan. 13, 2025

The rational design and construction of S-scheme heterojunctions represent an effective strategy for enhancing the photocatalytic efficiency. Nevertheless, challenge enabling efficient charge migration at interface persists. Herein, a 0D/2D heterojunction photocatalyst incorporating 0D Ag quantum dots S-vacancy-modified Bi2S3 with 2D MnFe2O4 ultrathin nanosheets (AgQDs/BQDs-SV/MFO) is designed constructed via photoinduced decomposition-defect engineering strategy. Theoretical calculations experimental results demonstrate presence dots, S vacancies, nanosheet structure in AgQDs/BQDs-SV/MFO significantly improves light harvesting, separation, transfer dramatically, resulting high-efficiency degradation rate (99.5%) toward Cr(VI) under visible irradiation (λ ≥ 420 nm) 30 min excellent stability. This work provides new insights constructing photocatalysts purifying Cr wastewater environmental remediation.

Language: Английский

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A Self‐Adaptive Quantum Dots/BaTiO₃ Junction Together with Giant Charge Separation‐Driving Force for CO₂ Photoreduction via Ferroelectric Polarization Engineering

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Quantum dots (QDs) with multiple exciton generation are identified as one of the most competitive candidates for highly efficient solar‐to‐chemical energy conversion, yet not well recognized in excellent CO 2 photoreduction activity due to agglomeration and effect. Here, taking Zn 0.5 Cd S QDs (ZCS QDs) an example, ferroelectric BaTiO 3 (BTO) high‐energy state polarization charges is introduced dynamically tune properties interfacial charges, achieving self‐adaptive electrostatic adsorption intensive photogenerated charge separation. Meanwhile, synergy Z‐scheme ZCS QDs/BTO heterojunction, carrier recombination further inhibited. Such a subtle modulation exhibits exceptional improvement photoreduction, reaching yields that 15.06 times 2.13 those pure BTO QDs, respectively. Notably, there remarkable 8.67 increase yield external polarization. The validity modulating strategy boosting demonstrated using double‐layer capacitance ( C dl ) situ Fourier transform infrared spectroscopy. This study shows great promise materials photoreduction.

Language: Английский

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Donor–Acceptor Fully Sp²‐Carbon Conjugated Covalent Organic Frameworks for Photocatalytic H₂O₂ Production

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Abstract Covalent organic frameworks (COFs) are promising for photocatalytic H₂O₂ generation. However, imine‐linked COFs often suffer from poor charge separation and low performance. Therefore, constructing sp 2 carbon‐linked with extended π‐conjugation is very significant in boosting the properties, but their synthesis challenging due to reversibility of C═C bond. Here, two vinylene‐linked COFs: BBT‐ACN COF‐1 COF‐2 designed. To investigate effects different structures on exciton binding energy ( E b ), designed possesses a Donor–Acceptor (D–A) structure electron‐deficient benzobisthiazole (BBT) as acceptor benzotrithiophene donor, while latter holds π‐A pyrene π‐unit BBT acceptor. Both show production activity two‐step 2e − oxygen reduction reaction (ORR). As anticipated, D–A structured exhibits lower value, its H O rate pure water air reaches up 2.50 mmol g⁻¹ h⁻¹, ≈3 times higher than that (0.91 h⁻¹). This study reveals fully ‐carbon‐linked beneficial production, which provides an effective approach designing high‐performance photocatalysts.

Language: Английский

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Porphyrin-based covalent organic frameworks with undulated layers for efficient photocatalytic CO2 reduction

Science Bulletin, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

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Electrochemiluminescent aptasensor based on covalent organic framework and ZnCdS composite for sensitive detection of Oxytetracycline

Sensors and Actuators B Chemical, Journal Year: 2025, Volume and Issue: unknown, P. 137858 - 137858

Published: April 1, 2025

Language: Английский

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Oxygen vacancies and Z-scheme heterostructure synergistic improve the photocatalytic glycerol reforming to syngas

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 158647 - 158647

Published: Dec. 1, 2024

Language: Английский

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