Synthesis and modification of ultrathin g-C3N4 for photocatalytic energy and environmental applications

Renewable and Sustainable Energy Reviews, Journal Year: 2022, Volume and Issue: 173, P. 113110 - 113110

Published: Dec. 20, 2022

Language: Английский

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Transition‐Metal‐Based Cocatalysts for Photocatalytic Water Splitting

Small Structures, Journal Year: 2022, Volume and Issue: 3(7)

Published: April 6, 2022

Recently, semiconductor‐based photocatalytic water splitting has been extensively studied as a promising strategy for converting solar energy into carbon‐neutral and clean H 2 fuel. However, the lack of sufficient active sites surface redox reactions generally results in unsatisfactory performances over semiconductors. For this problem, cocatalyst provides an encouraging solution is great significance improving performance. Noble metals their derivatives are mostly utilized efficient cocatalytic components, but scarcity expensiveness severely hamper large‐scale applications. Thereby, utilization noble‐metal‐free cocatalysts aroused immense research attention. Owing to facile availability, low cost, large abundance, high stability, performance, transition‐metal‐based materials have developed desirable candidates process. This review gives outline some recent advances cocatalysts. First, fundamentals presented, including classification, function mechanisms, loading methods, modification strategies, design considerations. Second, various cases depositing reduction cocatalysts, oxidation reduction–oxidation dual further discussed. Finally, crucial challenges possible directions proposed.

Language: Английский

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High-crystalline g-C3N4 photocatalysts: Synthesis, structure modulation, and H2-evolution application

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2023, Volume and Issue: 52, P. 127 - 143

Published: Sept. 1, 2023

Language: Английский

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Rational Synthesis of Au–CdS Composite Photocatalysts for Broad-Spectrum Photocatalytic Hydrogen Evolution

ACS Nano, Journal Year: 2023, Volume and Issue: 17(12), P. 11655 - 11664

Published: June 5, 2023

Incorporation of plasmonic metal nanomaterials can significantly enhance the visible light response semiconductor photocatalysts via localized surface plasmon resonance (LSPR) mechanisms. However, surfaces are often covered with surfactant molecules, which is undesired when used for photocatalytic hydrogen evolution, since molecules could compromise nanomaterials' cocatalyst functionalities by blocking active sites and/or inhibiting charge transfer process. Herein, we demonstrate a method that assembles Au nanoparticles (NPs) into colloidosomes (AuCSs) without modifying their surfactants. The resulting AuCSs were then coupled CdS formation Au-CdS composite through an in situ deposition method. assembly NPs induced broader and stronger LSPR AuCSs, while absence surfactants allowed them to act efficiently as cocatalysts. This essentially enhanced electron-hole pair generation rate further utilization efficiency, leading extremely high evolution 235.8 mmol·g-1·h-1 under simulated sunlight excitation.

Language: Английский

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Directional and Ultrafast Charge Transfer in Oxygen‐Vacancy‐Rich ZnO@Single‐Atom Cobalt Core‐Shell Junction for Photo‐Fenton‐Like Reaction

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: May 31, 2023

In photosynthesis, solar energy is harvested by photosensitizers, and then, the excited electrons transfer via a Z-Scheme mode to enzymatic catalytic centers trigger redox reactions. Herein, we constructed core-shell Z-scheme heterojunction of semiconductor@single-atom catalysts (SACs). The oxygen-vacancy-rich ZnO core single-atom Co-N4 sites supported on nitrogen-rich carbon shell (SA-Co-CN) act as photosensitizer enzyme-mimicking active centers, respectively. Driven built-in electric field across heterojunction, photoexcited could rapidly (2 ps) from n-type p-type SA-Co-CN shell, finally boosting performance surface-exposed for peroxymonosulfate (PMS) activation under light irradiation. synergies between photocatalysis heterogeneous Fenton-like reaction lead phenomenally enhanced production various reactive oxygen species rapid degradation microcontaminants in water. Experimental theoretical results validate that interfacial coupling with greatly facilitates PMS adsorption reducing enhancing cascade electron processes photo-Fenton-like reaction.

Language: Английский

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In situ cascade growth-induced strong coupling effect toward efficient photocatalytic hydrogen evolution of ReS2/ZnIn2S4

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 328, P. 122493 - 122493

Published: Feb. 20, 2023

Language: Английский

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Directional and Ultrafast Charge Transfer in Oxygen‐Vacancy‐Rich ZnO@Single‐Atom Cobalt Core‐Shell Junction for Photo‐Fenton‐Like Reaction

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(30)

Published: May 31, 2023

Abstract In photosynthesis, solar energy is harvested by photosensitizers, and then, the excited electrons transfer via a Z‐Scheme mode to enzymatic catalytic centers trigger redox reactions. Herein, we constructed core–shell Z‐scheme heterojunction of semiconductor@single‐atom catalysts (SACs). The oxygen‐vacancy‐rich ZnO core single‐atom Co−N 4 sites supported on nitrogen‐rich carbon shell (SA‐Co‐CN) act as photosensitizer enzyme‐mimicking active centers, respectively. Driven built‐in electric field across heterojunction, photoexcited could rapidly (2 ps) from n ‐type p SA‐Co‐CN shell, finally boosting performance surface‐exposed for peroxymonosulfate (PMS) activation under light irradiation. synergies between photocatalysis heterogeneous Fenton‐like reaction lead phenomenally enhanced production various reactive oxygen species rapid degradation microcontaminants in water. Experimental theoretical results validate that interfacial coupling with greatly facilitates PMS adsorption reducing enhancing cascade electron processes photo‐Fenton‐like reaction.

Language: Английский

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Dual Cocatalysts Synergistically Promote Perylene Diimide Polymer Charge Transfer for Enhanced Photocatalytic Water Oxidation

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(6), P. 2652 - 2660

Published: May 18, 2023

Water oxidation is a critical reaction in artificial photosynthesis which limited by high energy barrier and often requires matching cocatalysts. Dual cocatalysts Co3O4 Pt are combined with perylene diimide (PDI) polymer, accomplishing photocatalytic O2 production rate of 24.4 mmol g–1 h–1 under visible light irradiation, 5.4-fold enhancement compared PDI alone. Moreover, the apparent quantum yield evolution reaches 6.9% at 420 nm remains 1.2% 590 nm. The dual cocatalysts-constructed interfacial electric fields provide an anisotropic driving force for photogenerated holes to electrons Pt, synergistically improving spatial charge separation efficiency water oxidation. molecules serve as active sites improve utilization on surface. This work provides valuable demonstration interaction process mechanism cocatalysts, guiding selection high-efficiency solar conversion.

Language: Английский

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Challenges and Opportunities for Single‐Atom Electrocatalysts: From Lab‐Scale Research to Potential Industry‐Level Applications

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

Published: June 13, 2024

Single-atom electrocatalysts (SACs) are a class of promising materials for driving electrochemical energy conversion reactions due to their intrinsic advantages, including maximum metal utilization, well-defined active structures, and strong interface effects. However, SACs have not reached full commercialization broad industrial applications. This review summarizes recent research achievements in the design crucial electrocatalytic on sites, coordination, substrates, as well synthesis methods. The key challenges facing activity, selectivity, stability, scalability, highlighted. Furthermore, it is pointed out new strategies address these increasing activity enhancing utilization improving optimizing local environment, developing fabrication techniques, leveraging insights from theoretical studies, expanding potential Finally, views offered future direction single-atom electrocatalysis toward commercialization.

Language: Английский

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Polyoxometallate Cluster Induced High-Entropy Oxide Sub-1 nm Nanosheets as Photoelectrocatalysts for Zn–Air Batteries

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(15), P. 10735 - 10744

Published: April 4, 2024

The lack of highly efficient and inexpensive catalysts severely hinders the large-scale application Zn–air batteries (ZABs). High-entropy oxides (HEOs) exhibit unique structures attractive properties; thus, they are promising to be used in ZABs. However, conventional high-temperature synthesis methods tend obtain microscale HEOs with a lower exposure rate active sites. Here, we report facile solvothermal strategy for preparing two-dimensional (2D) HEO sub-1 nm nanosheets (SNSs) induced by polyoxometalate (POM) clusters. Taking advantage special 2D structure precise element regulation, these HEOs-POM SNSs enhanced bifunctional oxygen evolution reduction reaction activity under light irradiation. Further applying ZABs as cathode catalysts, CoFeNiMnCuZnOx-phosphomolybdic acid SNSs-based deliver low charge/discharge voltage gap 0.25 V at 2 mA cm–2 Meanwhile, it could maintain an ultralong-term stability 1600 h 930 10 cm–2. fine control provide opportunities solve problems intrinsic activity, limited sites, instability air cathodes

Language: Английский

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