Sulfur-mediated synthesis of carbon nitride: Band-gap engineering and improved functions for photocatalysis

Zhang, Jinshui; Sun, Jianhua; Maeda, Kazuhiko; Domen, Kazunari; Liu, Ping; Antonietti, Markus; Fu, Xianzhi; Wang, Xinchen

doi:10.1039/c0ee00418a

Cited by 725 publications

(503 citation statements)

References 25 publications

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“…1,2 For example, the absorption spectrum and the quantum conversion efficiency of a photocatalyst, which determine its performance, can be modulated by tuning the band gap (Eg), the positions of the valence band (VB) and the conduction band (CB), and the band dispersion of photocatalysts. 3 In a similar way to chemical composition, strain is a continuous variable that is capable of altering electronic structure.…”

Section: Abstract: Biobr {001} Facets Strain Photocatalysis Densimentioning

confidence: 99%

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Feng¹,

Xu²,

Wang³

et al. 2015

ACS Appl. Mater. Interfaces

138

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BiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a facile hydrothermal method. The inner strain in the BiOBr nanosheets has been tuned continuously by the pH value. The photocatalytic performance of BiOBr in dye degradation can be manipulated by the strain effect. The low-strain BiOBr nanosheets show improved photocatalytic activity. Density functional calculations suggest that strain can modify the band structure and symmetry in BiOBr. The enhanced photocatalytic activity in low-strain BiOBr nanosheets is due to improved charge separation attributable to a highly dispersive band structure with an indirect band gap. AbstractBiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a

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Section: Abstract: Biobr {001} Facets Strain Photocatalysis Densimentioning

confidence: 99%

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Feng¹,

Xu²,

Wang³

et al. 2015

ACS Appl. Mater. Interfaces

138

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“…First the carbon nitride and the cocatalyst K 2 PtCl 6 were added in Teflon crucibles, then 20 mL of the solvent mixture H 2 O/TEOA (triethanolamine) 9 : 1 were added and the temperature was maintained at 25 C by a thermostat. After stirring for 5 min at that temperature the reaction was started by switching on the xenon light source with a 395 nm cut-off filter and a light output of 1.5 W cm…”

Section: Photocatalytic Testsmentioning

confidence: 99%

Mesoporous carbon nitride–silica composites by a combined sol–gel/thermal condensation approach and their application as photocatalysts

Kailasam

Epping

Thomas

et al. 2011

Energy Environ. Sci.

248

176

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Mesoporous carbon nitrides, silicas and their composites have been prepared by a combined sol-gel and thermal condensation approach. Precursors for the carbon nitride (cyanamide) and silica (TEOS) are mixed and condensed simultaneously. After condensation and heat treatment it is observed that the carbon nitride and silica formed highly interpenetrating mesophases which leads either to the formation of mesoporous carbon nitride or silica after selective removal of one of the phases. Importantly, the carbon nitride preserves its graphitic stacking even in the spatial confinement introduced by the surrounding silica phase. As both precursors are liquids this approach allows convenient shaping into thin and thick films or monoliths of mesoporous carbon nitrides. Enhanced photocatalytic activity is observed for the production of hydrogen from water when these mesoporous carbon nitrides are applied as photocatalyst in comparison to the bulk, but also to other mesoporous carbon nitrides, prepared by the reported two-step, hard templating approach.

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“…3,4 Their applications 5 have benefited from the large and recent development of the graphite and graphene fields of research. Now, CN materials are investigated for applications in scientific and technological areas including supercapacitors, 6,7 catalysis, 8,9 photocatalysis [10][11][12] and bio-imaging. 13 For example considerable catalytic activity for Friedel-Crafts (FC) 14 and FC-type 15 reactions -avoiding the waste products created with the commonly used 16 FC catalyst AlCl 3 -were reported.…”

Section: Introductionmentioning

confidence: 99%

Challenges in calculating the bandgap of triazine-based carbon nitride structures

et al. 2017

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Graphitic carbon nitrides form a popular family of materials, particularly as photoharvesters in photocatalytic water splitting cells. Recently, relatively ordered g-C 3 N 4 and g-C 6 N 9 H 3 were characterized by X-Ray diffraction and their ability to photogenerate excitons was subsequently estimated using Density Functional Theory. In this study, the ability of triazine-based g-C 3 N 4 and g-C 6 N 9 H 3 to photogenerate excitons was studied using self-consistent GW computations followed by solving the Bethe-Salpeter Equation (BSE). We will use the prefix "gt-" to refer to these graphitic, triazine-based structures. In particular, monolayers, bilayers and 3D-periodic systems were characterized. The predicted optical band gaps are in the order of 1 eV higher than the experimentally measured ones, which is explained by a combination of shortcomings in the adopted model, small defects in the experimentally obtained structure and the particular nature of the experimental determination of the band gap.

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Sulfur-mediated synthesis of carbon nitride: Band-gap engineering and improved functions for photocatalysis

Cited by 725 publications

References 25 publications

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Mesoporous carbon nitride–silica composites by a combined sol–gel/thermal condensation approach and their application as photocatalysts

Challenges in calculating the bandgap of triazine-based carbon nitride structures

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