2D g-C3N4 for advancement of photo-generated carrier dynamics: Status and challenges

The development of graphite-carbon nitride (g-C3N4) photocatalyst is of great significance for various visible utilization applications. Control the nanostructures of g-C3N4 can tailor its photocatalytic performance. In this paper, one-dimensional chain-like g-C3N4 was successfully synthesized by heat-induced polymerization of melamine which was saturated in ethylene glycol. The photocatalytic hydrogen production rate (HER) of the prepared g-C3N4 chain enhanced about 3 times than that of bulk g-C3N4, increasing from 9.6 μmolh−1 to 28.7 μmolh−1. The improved photocatalytic activity of the g-C3N4 chain was attributed to the advantages of porosity and nanostructure. The extraordinary nanopores result in an enlarged specific surface area for adsorption and the production of abundantly available channels for charge transfer. The one-dimensional chain-like structure can facilitate the exposure of internal/external active sites as many as possible, and induce the directional migration of charge carriers.

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“…to the stretching modes of terminal NH 2 or NH groups at the defect sites of the aromatic ring (Li et al, 2020b;Li et al, 2020c).…”

Section: Resultsmentioning

confidence: 99%

“…The C-N stretching mode has IR band at 1,635 cm −1 . And the broadband near 3,200 cm −1 corresponds to the stretching modes of terminal NH 2 or NH groups at the defect sites of the aromatic ring ( Li et al, 2020b ; Li et al, 2020c ).…”

Section: Resultsmentioning

confidence: 99%

Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

et al. 2021

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“…[ 18 ] The g‐CN with two coordinate nitrogen (N2 C ) vacancies has been proved significantly effective in NO removal due to the featured properties. [ 19 ] Wang et al. [ 20 ] developed a novel g‐CN microtube with tunable nitrogen vacancies to enhance photocatalytic NO oxidation due to the reduced bandgap of g‐CN, resulting in the improvement of the light absorption capability.…”

Section: Introductionmentioning

confidence: 99%

Amorphous Carbon Nitride with Three Coordinate Nitrogen (N3_C) Vacancies for Exceptional NO_x Abatement in Visible Light

Duan

Wang

Gan

et al. 2021

Advanced Energy Materials

111

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Over the past several decades, much effort has been applied to atmospheric nitrogen oxide (NOx) abatement. The current techniques require high energy consumption and result in secondary pollution. Particularly, the removal of low dose (<200 ppm) of NOx has been very challenging. Though graphitic carbon nitride (g‐CN), an eco‐friendly and sustainable material was tried as a promising metal‐free photocatalyst for NOx abatement. Herein, a one‐step, energy efficient calcination approach is developed to prepare amorphous carbon nitride (ACN) with N3C‐site vacancies. The visible‐light responsive range is expanded and the activation barrier of NO triple bonds is sharply decreased by one order of magnitude; 0.19 eV when compared to the 2.22 eV of g‐CN. These modifications allow the NOx removal efficiency of ACN to reach 57.1% which is among the highest in visible light. The unique N3C‐site vacancies are well maintained after photocatalytic NO oxidation, which shows an exceptional structural stability. This boosts the generation of singlet oxygen (1O2) and superoxide radical (•O2−) for complete NO removal. This study sheds light on the active site design and photocatalytic performance enhancement of g‐CN based materials by vacancy engineering.

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“…[84][85][86] Although promising photocatalysts, bulk structured g-C 3 N 4 presents high recombination rate of charge carriers due internal defects and surface trap centers which lead to losses at the photocatalytic activity. [87][88][89] Nanoscale geometrical morphology designing of the g-C 3 N 4 is a strategy to overcome the mentioned drawbacks. [85] The effects of morphology and structural dimensionality on the photocatalytic properties of g-C 3 N 4 were investigated by Zhou et al [90] In comparison with 1D and 3D structures, the 2D configuration exhibits higher porosity, providing better mass transport, higher conductivity due improved charge transport within the in-plane direction, and enhanced optical absorption.…”

Section: Graphitic Carbon Nitride Catalystsmentioning

confidence: 99%

Reduction of CO₂ by Photoelectrochemical Process Using Non‐Oxide Two‐Dimensional Nanomaterials – A Review

et al. 2021

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Due to their catalytic characteristics, including highly accessible active sites, excellent charge separation properties, great capability for adsorption of CO2 and H2O due to abundant surface defects, and adjustable electronic features, non‐oxide two‐dimensional nanomaterials have received great attention in areas like water splitting and carbon dioxide (CO2) reduction. There are diverse non‐oxide 2D semiconductors reported in literature, among them this review inspects closely the two‐dimensional transition‐metal dichalcogenides (TMDC), MXene materials, graphitic carbon nitride catalysts, metal‐organic frameworks (MOFs), and the heterojunctions of those. This investigation is expected to stimulate new research to improve the design and possible applications of 2D materials by strategies that involve controlling the structural, optical, and electronic properties impacting the catalysts’ activity, selectivity, and stability for successful application in the CO2 reduction or other catalytic reactions.

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2D g-C3N4 for advancement of photo-generated carrier dynamics: Status and challenges

Cited by 257 publications

References 224 publications

Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Amorphous Carbon Nitride with Three Coordinate Nitrogen (N3_C) Vacancies for Exceptional NO_x Abatement in Visible Light

Reduction of CO₂ by Photoelectrochemical Process Using Non‐Oxide Two‐Dimensional Nanomaterials – A Review

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2D g-C3N4 for advancement of photo-generated carrier dynamics: Status and challenges

Cited by 257 publications

References 224 publications

Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Template-Free Synthesis of One-Dimensional g-C3N4 Chain Nanostructures for Efficient Photocatalytic Hydrogen Evolution

Amorphous Carbon Nitride with Three Coordinate Nitrogen (N3C) Vacancies for Exceptional NOx Abatement in Visible Light

Reduction of CO2 by Photoelectrochemical Process Using Non‐Oxide Two‐Dimensional Nanomaterials – A Review

Contact Info

Product

Resources

About

Amorphous Carbon Nitride with Three Coordinate Nitrogen (N3_C) Vacancies for Exceptional NO_x Abatement in Visible Light

Reduction of CO₂ by Photoelectrochemical Process Using Non‐Oxide Two‐Dimensional Nanomaterials – A Review