Two-dimensional transition metal carbide and nitride (MXene) derived quantum dots (QDs): synthesis, properties, applications and prospects

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 8(16), P. 7508 - 7535

Published: Jan. 1, 2020

Recent progress of MXene QDs, including their synthesis, properties, applications, and future perspectives challenges.

Language: Английский

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Recent advances on Bismuth-based Photocatalysts: Strategies and mechanisms

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 419, P. 129484 - 129484

Published: March 27, 2021

Language: Английский

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Engineered Graphitic Carbon Nitride-Based Photocatalysts for Visible-Light-Driven Water Splitting: A Review

Energy & Fuels, Journal Year: 2021, Volume and Issue: 35(8), P. 6504 - 6526

Published: April 5, 2021

Graphitic carbon nitride (g-C3N4), a polymeric semiconductor, has become rising star for photocatalytic energy conversion because of its facile accessibility, metal-free nature, low cost, and environmentally benign properties. This work reviews the latest progress g-C3N4-based materials in visible-light-driven water splitting to hydrogen. It begins with brief history g-C3N4, followed by various engineering strategies such as elemental doping, copolymerization, crystalline tailoring, surface engineering, single-atom modification, elevated decomposition. In addition, synthesis g-C3N4 different dimensions (0D, 1D, 2D, 3D) configurations series heterojunctions (type II, Z-scheme, S-scheme, g-C3N4/metal, g-C3N4/carbon heterojunctions) were also discussed their improvement hydrogen production. Lastly, challenges opportunities nanomaterials are provided. is anticipated that this review will promote further development emerging more efficiency

Language: Английский

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Chemically bonded carbon quantum dots/Bi2WO6 S-scheme heterojunction for boosted photocatalytic antibiotic degradation: Interfacial engineering and mechanism insight

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 330, P. 122587 - 122587

Published: March 6, 2023

Language: Английский

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Spatially Separating Redox Centers on Z‐Scheme ZnIn₂S₄/BiVO₄ Hierarchical Heterostructure for Highly Efficient Photocatalytic Hydrogen Evolution

Small, Journal Year: 2020, Volume and Issue: 16(37)

Published: Aug. 9, 2020

Photocatalysis technology using solar energy for hydrogen (H2 ) production still faces great challenges to design and synthesize highly efficient photocatalysts, which should realize the precise regulation of reactive sites, rapid migration photoinduced carriers strong visible light harvest. Here, a facile hierarchical Z-scheme system with ZnIn2 S4 /BiVO4 heterojunction is proposed, can precisely regulate redox centers at hetero-interface by accelerating separation charges, then enhance oxidation reduction ability holes electrons, respectively. Therefore, exhibits excellent photocatalytic performance much higher H2 -evolution rate 5.944 mmol g-1 h-1 , about five times than that pure . Moreover, this shows good stability recycle ability, providing promising photocatalyst new strategy manufacture remarkable materials.

Language: Английский

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Spontaneous full photocatalytic water splitting on 2D MoSe₂/SnSe₂ and WSe₂/SnSe₂ vdW heterostructures

Nanoscale, Journal Year: 2019, Volume and Issue: 11(31), P. 14836 - 14843

Published: Jan. 1, 2019

Spontaneous full photocatalytic water splitting into hydrogen and oxygen under visible light irradiation without the need for sacrificial agents is a challenging task, because suitable band gaps, low overpotentials both half-reactions spatially-separated catalytic sites should be fulfilled simultaneously in system. Here, we propose promising strategy to achieve this goal by constructing van der Waals (vdW) heterostructures of two-dimensional (2D) materials. Using first-principles calculations, predict two photocatalysts, MoSe2/SnSe2 WSe2/SnSe2 heterostructures, with evolution reaction (HER) (OER) taking place separately on MoSe2 (WSe2) SnSe2 layers. More excitingly, Se-vacancy monolayer effectively lowers HER overpotential, making reactions occur spontaneously potentials solely provided photo-generated electrons holes pure water. The unique alignment these hetero-structured photocatalysts leads high solar-to-hydrogen (STH) energy conversion efficiencies up 10.5%, which quite commercial applications. This work opens an avenue design highly-efficient splitting.

Language: Английский

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PW12/CN@Bi2WO6 composite photocatalyst prepared based on organic-inorganic hybrid system for removing pollutants in water

Separation and Purification Technology, Journal Year: 2019, Volume and Issue: 235, P. 116270 - 116270

Published: Nov. 3, 2019

Language: Английский

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Photocatalytic Z‐Scheme Overall Water Splitting: Recent Advances in Theory and Experiments

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(52)

Published: Oct. 7, 2021

Abstract Photocatalytic water splitting is considered one of the most important and appealing approaches for production green H 2 to address global energy demand. The utmost possible form artificial photosynthesis a two‐step photoexcitation known as “Z‐scheme”, which mimics natural photosystem. This process solely relies on effective coupling suitable band positions semiconductors (SCs) redox mediators purpose catalyze surface chemical reactions significantly deter backward reaction. In recent years, Z‐scheme strategies their key role have been studied progressively through experimental approaches. addition, theoretical studies based density functional theory provided detailed insight into mechanistic aspects some breathtakingly complex problems associated with hydrogen evolution reaction oxygen this context, critical review gives an overview fundamentals photocatalysis, including both advancements in field photocatalytic splitting, suggests future perspectives.

Language: Английский

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Photocatalytic Oxygen Evolution from Water Splitting

Advanced Science, Journal Year: 2020, Volume and Issue: 8(1)

Published: Nov. 18, 2020

Abstract Photocatalytic water splitting has attracted a lot of attention in recent years, and O 2 evolution is the decisive step owing to complex four‐electrons reaction process. Though many studies have been conducted, it necessary systematically summarize introduce research on photocatalytic evolution, thus systematic review needed. First, corresponding principles about some urgently encountered issues based fundamentals are introduced. Then, several types classical oxidation photocatalysts, including TiO , BiVO 4 WO 3 α ‐Fe newly developed ones, such as Sillén–Aurivillius perovskites, porphyrins, metal–organic frameworks, etc., highlighted detail, terms their crystal structures, synthetic approaches, morphologies. Third, diverse strategies for activity improvement via enhancing photoabsorption charge separation presented, cocatalysts loading, heterojunction construction, doping vacancy formation, other strategies. Finally, key challenges future prospects with regard proposed. The purpose this provide timely summary guideline works evolution.

Language: Английский

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Unraveling the Interfacial Charge Migration Pathway at the Atomic Level in a Highly Efficient Z‐Scheme Photocatalyst

Angewandte Chemie International Edition, Journal Year: 2019, Volume and Issue: 58(33), P. 11329 - 11334

Published: May 22, 2019

A highly efficient Z-scheme photocatalytic system constructed with 1D CdS and 2D CoS2 exhibited high hydrogen-evolution activity of 5.54 mmol h-1 g-1 an apparent quantum efficiency 10.2 % at 420 nm. More importantly, its interfacial charge migration pathway was unraveled: The electrons are efficiently transferred from to through a transition atomic layer connected by Co-S5.8 coordination, thus resulting in more photogenerated carriers participating surface reactions. Furthermore, the charge-trapping charge-transfer processes were investigated transient absorption spectroscopy, which gave estimated charge-separation yield approximately 91.5 charge-separated-state lifetime (5.2±0.5) ns CdS/CoS2 . This study elucidates key role layers heterojunctions will facilitate development systems.

Language: Английский

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