Fluorenone‐Based Covalent Triazine Frameworks/Twinned Zn_0.5Cd_0.5S S‐scheme Heterojunction for Efficient Photocatalytic H₂ Evolution

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(28)

Published: March 12, 2024

Abstract Photocatalytic hydrogen evolution reaction (HER) is a very promising and sustainable technology, yet precisely exploring effective HER photocatalysts remains critical challenge due to the rapid charge recombination. In this work, brand‐new S‐scheme heterojunction successfully designed constructed by in situ growth of twinned Zn 0.5 Cd S Solid Solution (CZS) on novel fluorenone‐based covalent triazine framework (FOCTF). The heterojunctions identified via irradiation XPS, electron spin resonance, which can greatly improve photocatalytic rate stability. Under illumination, highest well‐designed CZS‐FOCTF 247.62 mmolg −1 h , 3.83 times as high that pure CZS. Experimental theoretical investigations corroborate new FOCTF has well‐matched staggered band alignment work function difference with as‐fabricated establish favorable internal electric field, accelerates directional migration, thereby enhancing separation utilization efficiency carriers. This finding achieves spatially oriented powerful transport at interfaces inorganic–organic hybrid heterojunctions. It thus desirable furnish an alternative strategy rationally design CZS‐based based organic oxidation semiconductors for diversified reactions.

Language: Английский

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Iso‐Elemental ZnIn₂S₄/Zn₃In₂S₆ Heterojunction with Low Contact Energy Barrier Boosts Artificial Photosynthesis of Hydrogen Peroxide

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 27, 2024

Abstract Artificial photosynthesis emerges as a strategic pathway to produce hydrogen peroxide (H 2 O ), an environmentally benign oxidant and clean energy carrier. Nonetheless, in many heterojunction‐based artificial photosynthetic systems, the H productivity is significantly hindered by poor carrier transport, narrow spectral light absorption, lack of adequate active sites for two‐electron oxygen reduction reaction. Herein, catalyst architecture with iso‐elemental heterojunction formed interfacing Zn 3 In S 6 nano‐flowers ZnIn 4 nanosheets proposed. This exhibits production rate high 23.47 µmol g −1 min under UV–vis irradiation, which attributed minimized contact barrier enhanced lattice match at /Zn interface thanks aids efficient separation transfer photogenerated carriers. Theoretical simulations alongside comprehensive in‐situ ex‐situ characterizations confirm photo‐redox generation effective dynamics across surface. Moreover, substituting one reduction‐type other non‐iso‐elemental catalysts like CdIn , TiO CdS further confirms feasibility superiority proposed configuration. work offers new perspective on designing .

Language: Английский

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Cd Single Atom as an Electron Mediator in an S‐Scheme Heterojunction for Artificial Photosynthesis of H₂O₂

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

Published: Feb. 13, 2025

Abstract Developing conductor‐mediated S‐scheme heterojunction photocatalysts imitating natural photosynthetic systems emerges as a promising approach to hydrogen peroxide (H 2 O ) production. However, achieving precise coupling between two semiconductors with charge shuttle and modulating the interfacial interactions still remain significant bottleneck. Herein, we propose catalyst architecture Cd single atom mediated formed by interfacing CdS TiO nanoparticles. This exhibits an H production rate high 60.33 µmol g −1 min under UV–vis light irradiation, which is attributed efficient transport at interface of thanks S‐scheme. In‐situ X‐ray photoelectron spectroscopy (XPS) electron spin resonance (ESR) spin‐trapping tests confirm transfer route. Femtosecond transient absorption (fs‐TA) other ex‐situ characterizations further corroborate across interface. work offers new perspective on constructing atoms heterojunctions enhance photocatalytic performance.

Language: Английский

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Recent advancements in graphitic carbon nitride based direct Z- and S-scheme heterostructures for photocatalytic H₂O₂ production

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(16), P. 4914 - 4973

Published: Jan. 1, 2024

This review summarizes advancements in g-C 3 N 4 -based direct Z and S-scheme heterostructures for solar H 2 O synthesis, exploring advanced characterization methods to verify the charge transfer mechanism.

Language: Английский

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The evolution of photocatalytic H₂O₂ generation: from pure water to natural systems and beyond

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(18), P. 6482 - 6498

Published: Jan. 1, 2024

Exploring advancements in photocatalytic hydrogen peroxide production, emphasizing technological breakthroughs pure water, natural microdroplets and coupling systems.

Language: Английский

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Fluorinated-TiO₂/Mn_0.2Cd_0.8S S-Scheme Heterojunction with Rich Sulfur Vacancies for Photocatalytic Hydrogen Production

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(7), P. 7978 - 7988

Published: March 29, 2024

The quick recombination of photogenerated carriers and the high surface reaction barrier are two important aspects influencing photocatalytic hydrogen generation. In this paper, a sulfur vacancy-modified two-dimensional (2D) fluorinated-TiO2 nanosheet/Mn0.2Cd0.8S (F-TiO2/MCS) S-scheme heterojunction was synthesized by simple hydrothermal method to accelerate electron transfer. formation an between MCS nanoflowers 2D F-TiO2 enhances efficacy generation facilitating separation electron–hole pairs. Meanwhile, vacancies F-TiO2/MCS change local electronic structure capturing electrons, resulting in evolution rate for 3197 μmol g–1 h–1, which is 4.42 times greater than that pure MCS. Experimental measurements density functional theory (DFT) calculations show mutual synergy not only provides abundant H2 adsorption active sites but also promotes interfacial charge migration, improves performance composite. This work holds significance production heterojunctions.

Language: Английский

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Boosted Charge Transfer for Highly Efficient Photosynthesis of H₂O₂ over Z‐Scheme I⁻/K⁺ Co‐Doped g‐C₃N₄/Metal–Organic‐Frameworks in Pure Water under Visible Light

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(38)

Published: July 9, 2024

Abstract Photocatalytic oxygen reduction reaction (ORR) is an environmentally friendly and cost‐effective approach for H 2 O synthesis. However, the current photosynthesis system suffers from sluggish kinetics, rapid recombination of photoexcited charge carriers, weak redox potentials, resulting in unsatisfactory solar‐to‐chemical conversion efficiency. Herein, a Z‐scheme heterojunction (UiO/IKCN) constructed through coupling I − /K + co‐doped g‐C 3 N 4 (IKCN) with NH ‐UiO‐66, typical metal‐organic framework material. Under visible light irradiation, optimal UiO/IKCN exhibits exceptional production rates pure water (13.3 mM g −1 h ) isopropanol solution (72.6 ), that 48.4 times higher than pristine CN (1.5 ). A high apparent quantum yield 10.28% at 420 nm achieved by UiO/IKCN, surpassing most previously reported values. The dominating role two‐electron ORR elucidated detail. significantly enhanced photocatalytic activity can be attributed to facilitated separation transfer, which are unambiguously verified stable‐state surface photovoltage, transient photoluminescence, femtosecond absorption spectroscopy, in‐situ irradiated X‐ray photoelectron density functional theory calculations. This study represents first exploration using ‐UiO‐66 provides insights into rational design highly efficient photosynthesis.

Language: Английский

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Visible-light-driven CO2 photoreduction over atomically strained indium sites in ambient air

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 1, 2025

Strain engineering offers an attractive strategy for improving intrinsic catalytic performance of a heterogeneous catalyst. Herein, we successfully create strain into layered indium sulfide (In2S3) at atomic scale via introducing oxygen coordination and sulfur vacancy using wet-chemistry method. The atomically strained In2S3 exhibits greatly enhanced CO2 photoreduction performance, achieving to CO conversion rate 5.16 μmol gcatalyst−1 h−1 under visible light illumination in ambient air. In-situ spectroscopic measurements together with theoretical calculations indicate that the features lattice disordered defects on surface, which provides rich uncoordinated sites induces structural distortion, resulting modified band structure promotes adsorption/activation boosts photogenerated charge carriers' separation during photoreduction. This work new approach rational design photocatalysts reduction Achieving visible-light-driven air is significant yet challenging. Here, authors introduce promoted activation boosted carrier atmospheric

Language: Английский

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S-scheme graphitic carbon nitride/nickel titanate (g-C3N4/NiTiO3) heterojunction as bifunctional photocatalysts for hydrogen production and pollutants degradation

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 114, P. 60 - 70

Published: March 1, 2025

Language: Английский

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Plasmon-mediated dual S-scheme charge transfer in Cu2−xS/In2S3/Bi2S3 hollow polyhedrons for efficient Photothermal-Assisted photocatalysis

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 690, P. 137280 - 137280

Published: March 10, 2025

Language: Английский

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