Boron-doped nitrogen-deficient carbon nitride-based Z-scheme heterostructures for photocatalytic overall water splitting

Nature Energy, Journal Year: 2021, Volume and Issue: 6(4), P. 388 - 397

Published: March 22, 2021

Language: Английский

---

Heterogeneous Single-Atom Photocatalysts: Fundamentals and Applications

Chemical Reviews, Journal Year: 2020, Volume and Issue: 120(21), P. 12175 - 12216

Published: March 18, 2020

Single-atom photocatalysts have shown their compelling potential and arguably become the most active research direction in photocatalysis due to fascinating strengths enhancing light-harvesting, charge transfer dynamics, surface reactions of a photocatalytic system. While numerous comprehensions about single-atom recently been amassed, advanced characterization techniques vital theoretical studies are strengthening our understanding on these materials, allowing us forecast working mechanisms applications photocatalysis. In this review, we begin by describing general background definition photocatalysts. A brief discussion metal-support interactions is then provided. Thereafter, current available for summarized. After having some fundamental photocatalysts, advantages discussed. Finally, end review with look into remaining challenges future perspectives We anticipate that will provide inspiration discovery manifestly stimulating development emerging area.

Language: Английский

---

Unraveling the dual defect sites in graphite carbon nitride for ultra-high photocatalytic H₂O₂ evolution

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(2), P. 830 - 842

Published: Jan. 1, 2022

The g-C 3 N 4 with dual defect sites exhibits excellent photocatalytic H 2 O generation activity and selectivity, the key role of each site in surface reaction mechanism is revealed.

Language: Английский

---

Efficient Photocatalytic Overall Water Splitting Induced by the Giant Internal Electric Field of a g‐C₃N₄/rGO/PDIP Z‐Scheme Heterojunction

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(7)

Published: Jan. 14, 2021

Abstract A graphitic carbon nitride/rGO/perylene diimide polymer (g‐C 3 N 4 /rGO/PDIP) Z‐scheme heterojunction is successfully constructed to realize high‐flux charge transfer and efficient photocatalytic overall water splitting. giant internal electric field in the junction built, enabling separation efficiency be enhanced dramatically by 8.5 times. Thus, g‐C /rGO/PDIP presents an stable splitting activity with H 2 O evolution rate of 15.80 7.80 µmol h −1 , respectively, ≈12.1 times higher than nanosheets. Meanwhile, a notable quantum 4.94% at 420 nm solar‐to‐hydrogen energy‐conversion 0.30% are achieved, prominently surpassing many reported ‐based photocatalysts. Briefly, this work throws light on enhancing interface control improve performance.

Language: Английский

---

A Promoted Charge Separation/Transfer System from Cu Single Atoms and C₃N₄ Layers for Efficient Photocatalysis

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(33)

Published: July 9, 2020

Establishing highly effective charge transfer channels in carbon nitride (C3 N4 ) for enhancing its photocatalytic activity is still a challenging issue. Herein, the first time, engineering of C3 layers with single-atom Cu bonded compositional N (CuNx demonstrated to address this challenge. The CuNx formed by intercalation chlorophyll sodium copper salt into melamine-based supramolecular precursor followed controlled pyrolysis. Two groups are identified: one group each atoms three in-plane atoms, while other four two neighboring layers, thus forming both and interlayer channels. Importantly, ultrafast spectroscopy has further proved that can greatly improve separation/transfer carriers turn boost efficiency. Consequently, catalyst exhibits superior visible-light hydrogen production rate (≈212 µmol h-1 /0.02 g catalyst), 30 times higher than bulk . Moreover, it leads an outstanding conversion (92.3%) selectivity (99.9%) oxidation benzene under visible light.

Language: Английский

---

Iodide‐Induced Fragmentation of Polymerized Hydrophilic Carbon Nitride for High‐Performance Quasi‐Homogeneous Photocatalytic H₂O₂ Production

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(48), P. 25546 - 25550

Published: Sept. 18, 2021

Polymeric carbon nitride (PCN) as a class of two-electron oxygen reduction reaction (2 e- ORR) photocatalyst has attracted much attention for H2 O2 production. However, the low activity and inferior selectivity 2 ORR greatly restrict production efficiency. Herein, we develop new strategy to synthesize hydrophilic, fragmented PCN by terminating polymerization (TP-PCN) effect iodide ions. The obtained TP-PCN with abundant edge active sites (AEASs), which can form quasi-homogeneous photocatalytic system, exhibits superior generation rate (3265.4 μM h-1 ), far surpassing other PCN-based photocatalysts. DFT calculations further indicate that is more favorable electron transiting from β spin-orbital π* orbitals , optimizes activation reduces energy barrier formation. This work provides concept designing functional photocatalysts understanding mechanism in

Language: Английский

---

C-, N-Vacancy defect engineered polymeric carbon nitride towards photocatalysis: viewpoints and challenges

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 9(1), P. 111 - 153

Published: Nov. 19, 2020

As an alluring metal-free polymeric semiconductor material, graphite-like carbon nitride (g-C 3 N 4 ; abbreviated as GCN) has triggered a new impetus in the field of photocatalysis, mainly favoured from its fascinating physicochemical and photoelectronic structural features.

Language: Английский

---

A Review of MOFs and Their Composites‐Based Photocatalysts: Synthesis and Applications

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(37)

Published: June 26, 2021

Abstract Photocatalysis is considered to be a green and environment‐friendly technology since it can convert solar energy into other types of chemical energies. Over the past several years, metal‐organic frameworks (MOFs)‐based photocatalysts have received remarkable research interest due their unique morphology, high photocatalytic performance, good stability, easy synthesis, low cost. In this review, synthetic strategies developing MOFs‐based are first introduced. Second, recent progress in fabrication various MOFs composites summarized. Third, different applications including hydrogen evolution reaction, oxygen overall water splitting, nitrogen reduction carbon dioxide reaction as well photodegradation organic pollutants summed up. Finally, challenges some suggestions for future development MOFs‐ composites‐based also highlighted. It expected that report will help researchers systematically devise develop highly efficient based on composites.

Language: Английский

---

Silver Single Atom in Carbon Nitride Catalyst for Highly Efficient Photocatalytic Hydrogen Evolution

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(51), P. 23112 - 23116

Published: Sept. 10, 2020

Single atom catalysts (SACs) with the maximized metal efficiency have sparked great attention. However, it is challenging to obtain SACs high loading, catalytic activity, and good stability. Herein, we demonstrate a new strategy develop highly active stable Ag single in carbon nitride (Ag-N2 C2 /CN) catalyst unique coordination. The atomic dispersion Ag-N2 configuration been identified by aberration-correction high-angle-annular-dark-field scanning transmission electron microscopy (AC-HAADF-STEM) extended X-ray absorption. Experiments DFT calculations further verify that can reduce H2 evolution barrier, expand light absorption range, improve charge transfer of CN. As result, /CN exhibits much better activity than N-coordinated CN (Ag-N4 /CN), even superior Pt nanoparticle-loaded (PtNP /CN). This work provides idea for design synthesis novel configurations excellent durability.

Language: Английский

---

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

---