Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H2 evolution photocatalyst

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

Published: Jan. 9, 2024

Abstract So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance intrinsic activities hydrogen evolution photocatalyst and oxygen photocatalyst, promote electron transfer from suppress back reactions. The present work develop a high-performance oxysulfide Sm 2 Ti O 5 S , as an for use in system combination with BiVO 4 reduced graphene oxide solid-state mediator. After surface modifications photocatalysts charge separation redox reactions, this able split into more than 100 hours solar-to-hydrogen energy conversion efficiency 0.22%. In contrast many existing photocatalytic activity only minimally by increasing background pressure 90 kPa. These results suggest characteristics suitable applications under practical operating conditions.

Language: Английский

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Clean Production of Hydrogen Peroxide: A Heterogeneous Solar‐Driven Redox Process

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(36)

Published: Aug. 6, 2023

Abstract Hydrogen peroxide is an essential chemical that attracting strong attention for energy and environmental applications. However, the struggle between growing market demand unsustainability of conventional anthraquinone method motivates exploration alternative H 2 O production processes. Although several new processes have been proposed, environmental‐friendly solar‐driven attracts most because only inputs water, oxygen, light energy. The rational design functional photo‐responsive catalysts promotes in photocatalytic photoelectrocatalytic approaches. These are, general, achieved by facilitating preferential adsorption key intermediates OOH*/OH*/O*, enhancing absorption, promoting charge separation, accelerating surface transfer with selective number involved charges. This review systematically summarizes strategies photo(electro)catalysts toward via both water oxidation oxygen reduction pathways. Though route perceived as more popular community, emerging a convincing alternative. Furthermore, prevailing hypotheses, state‐of‐the‐art catalysts, critical challenges, perspectives are discussed depth. aims to enhance comprehension this research field promote interest sustainable production.

Language: Английский

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Synergistic Metal‐Nonmetal Active Sites in a Metal‐Organic Cage for Efficient Photocatalytic Synthesis of Hydrogen Peroxide in Pure Water

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 12, 2023

Photocatalytic synthesis of hydrogen peroxide (H2 O2 ) is a potential clean method, but the long distance between oxidation and reduction sites in photocatalysts hinders rapid transfer photogenerated charges, limiting improvement its performance. Here, metal-organic cage photocatalyst, Co14 (L-CH3 )24 , constructed by directly coordinating metal (Co sites) used for reaction (ORR) with non-metallic (imidazole ligands) H2 O (WOR), which shortens transport path electrons holes, improves efficiency charges activity photocatalyst. Therefore, it can be as an efficient photocatalyst rate high 146.6 μmol g-1 h-1 production under -saturated pure water without sacrificial agents. Significantly, combination photocatalytic experiments theoretical calculations proves that functionalized modification ligands more conducive to adsorbing key intermediates (*OH WOR *HOOH ORR), resulting better This work proposed new catalytic strategy first time; i.e., build synergistic metal-nonmetal active site crystalline catalyst use host-guest chemistry inherent (MOC)to increase contact substrate catalytically site, finally achieve synthesis.

Language: Английский

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Efficient Photosynthesis of Hydrogen Peroxide by Cyano‐Containing Covalent Organic Frameworks from Water, Air and Sunlight

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(6)

Published: Dec. 28, 2023

Abstract The insufficient exciton ( e − ‐ h + pair) separation/transfer and sluggish two‐electron water oxidation are two main factors limiting the H 2 O photosynthetic efficiency of covalent organic frameworks (COFs) photocatalysts. Herein, we present an alternative strategy to simultaneously facilitate reduce energy barrier in COFs via a dicyano functionalization. situ characterization theoretical calculations reveal that functionalization improves amount charge transfer channels between donor acceptor units from COF‐0CN without cyano three COF‐1CN with mono‐cyano four COF‐2CN functionalization, leading highest COF‐2CN. More importantly, group activates neighbouring C atom produce key *OH intermediate for effectively reducing rate‐determining photosynthesis. enhanced result high yield (1601 μmol g −1 ) oxygen using sacrificial reagent under visible‐light irradiation. can wide pH range, different real samples, scaled‐up reactor natural sunlight irradiation, continuous‐flow consecutively producing solution decontamination.

Language: Английский

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Tailoring metal–organic frameworks for photocatalytic H2O2 production

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 501, P. 215597 - 215597

Published: Dec. 11, 2023

Language: Английский

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