Surface Modification of 2D Photocatalysts for Solar Energy Conversion

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(23)

Published: March 9, 2022

Abstract 2D materials show many particular properties, such as high surface‐to‐volume ratio, anisotropic degree, and adjustable chemical functionality. These unique properties in have sparked immense interest due to their applications photocatalytic systems, resulting significantly enhanced light capture, charge‐transfer kinetics, surface reaction. Herein, the research progress photocatalysts based on varied compositions functions, followed by specific modification strategies, is introduced. Fundamental principles focusing harvesting, charge separation, molecular adsorption/activation 2D‐material‐based system are systemically explored. The examples described here detail use of various energy‐conversion including water splitting, carbon dioxide reduction, nitrogen fixation, hydrogen peroxide production, organic synthesis. Finally, elaborating challenges possible solutions for developing these materials, review expected provide some inspiration future used efficient energy conversions.

Language: Английский

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Heterogeneous‐Interface‐Enhanced Adsorption of Organic and Hydroxyl for Biomass Electrooxidation

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(42)

Published: Aug. 29, 2022

Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) provides an efficient way to obtain high-value-added biomass-derived chemicals. Compared with other transition metal oxides, CuO exhibits poor oxygen evolution reaction performance, leading high Faraday efficiency for HMF oxidation. However, the weak adsorption and activation ability OH- species restricts its further development. Herein, CuO-PdO heterogeneous interface is successfully constructed, resulting in advanced onset-potential (HMFOR), a higher current density than CuO. The results open-circuit potential, situ infrared spectroscopy, theoretical calculations indicate that introduction PdO enhances capacity organic molecule. Meanwhile, promotes species, as demonstrated by zeta potential electrochemical measurements. This work elucidates enhancement mechanism interfaces constructive guidance designing multicomponent electrocatalysts electrocatalytic reactions.

Language: Английский

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Shear Stress Triggers Ultrathin-Nanosheet Carbon Nitride Assembly for Photocatalytic H₂O₂ Production Coupled with Selective Alcohol Oxidation

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(38), P. 20837 - 20848

Published: Aug. 25, 2023

Coupled photocatalysis without cocatalysts can maximize the utilization of photons and atoms, which puts forward higher demands on photocatalysts. Polymeric carbon nitride (CN) has become most promising photocatalyst, but still suffers from major drawbacks insufficient catalytic sites low quantum efficiency. Herein, we report a fluid shear stress-assisted molecular assembly to prepare ultrathin-nanosheet-assembled acanthosphere-like CN (ASCN) with nitrogen vacancy (Nv) carbonyl modification. Shear stress breaks stacking interactions between layers cuts stacked structure into ultrathin layers, are further reassembled acanthosphere bundles driven by "centrifugal force". Benefitted greatly nature that provides more exposed active improves charge carrier separation, ASCN-3 exhibits 20-fold activity than bulk counterpart toward oxygen reduction H2O2 coupled 4-methoxybenzyl alcohol (4-MBA) oxidation anisaldehyde (AA), significantly increased turnover frequency (TOF) values (TOF: 1.69 h–1 for 1.02 AA). Significantly, 95.8% conversion 4-MBA nearly 100% selectivity. High apparent yields 11.7% 9.3% at 420 nm achieved photosynthesis oxidation. Mechanism studies suggest induces holes concentrated neighboring melem unit directly oxidize Cα–H bond produce radicals, Nv as adsorption site traps electrons form superoxide radical combines shed protons H2O2. This work presents simple physical method break layered stack creating hierarchical photocatalysis.

Language: Английский

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A review on photo-, electro- and photoelectro- catalytic strategies for selective oxidation of alcohols

Journal of Energy Chemistry, Journal Year: 2022, Volume and Issue: 77, P. 80 - 118

Published: Nov. 1, 2022

Language: Английский

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Dual transfer channels of photo-carriers in 2D/2D/2D sandwich-like ZnIn2S4/g-C3N4/Ti3C2 MXene S-scheme/Schottky heterojunction for boosting photocatalytic H2 evolution

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2022, Volume and Issue: 43(10), P. 2720 - 2731

Published: Jan. 1, 2022

Language: Английский

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Constructing interfacial active sites in Ru/g-C3N4−x photocatalyst for boosting H2 evolution coupled with selective benzyl-alcohol oxidation

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 315, P. 121575 - 121575

Published: June 1, 2022

Language: Английский

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Synergistic effect of cyano defects and CaCO3 in graphitic carbon nitride nanosheets for efficient visible-light-driven photocatalytic NO removal

Journal of Hazardous Materials, Journal Year: 2022, Volume and Issue: 442, P. 130040 - 130040

Published: Sept. 21, 2022

Language: Английский

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Photoredox‐Promoted Co‐Production of Dihydroisoquinoline and H₂O₂ over Defective Zn₃In₂S₆

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(10)

Published: Jan. 5, 2023

One of the most sustainable and promising approaches for hydrogen peroxide (H2 O2 ) production in a low-cost environment-friendly way is photosynthesis, which, however, suffers from poor carrier utilization low H2 productivity. The addition proton donors such as isopropanol or ethanol can increase production, unfortunately, will inevitably elevate entire cost while wasting oxidizing power holes (h+ ). Herein, tetrahydroisoquinolines (THIQs) employed distinctive donor thermodynamically feasible selective semi-dehydrogenation reaction to highly valuable dihydroisoquinolines (DHIQs), meanwhile, couple with promote generation one photoredox under photocatalysis by dual-functional Zn3 In2 S6 photocatalyst. Surprisingly, suitably defective offers an excellent near-stoichiometric co-production performance DHIQs at unprecedentedly high rates 66.4 62.1 mmol h-1 g-1 visible light (λ ≥ 400 nm), respectively, which outperforms all previously available reports even though sacrificial agents were those reports. Additionally, photocatalytic redox mechanism demonstrates that be generated through multiple pathways, highlighting synergistic effect among ROS (·O2- 1 ), h+ donor, has been ignored previous studies.

Language: Английский

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Photocatalytic materials for sustainable chemistry via cooperative photoredox catalysis

Catalysis Today, Journal Year: 2022, Volume and Issue: 410, P. 85 - 101

Published: April 13, 2022

Language: Английский

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Modulating g-C3N4-based van der Waals heterostructures with spatially separated reductive centers for tandem photocatalytic CO2 methanation

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 330, P. 122666 - 122666

Published: March 21, 2023

Language: Английский

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