Oxygenated monolayer carbon nitride for excellent photocatalytic hydrogen evolution and external quantum efficiency

She, Xiaojie; Wu, Jingjie; Zhong, Jun; Xu, Hui; Yang, Yingchao; Vajtai, Róbert; Liu, Yang; Du, Daolin; Li, Huaming; Ajayan, Pulickel M.

doi:10.1016/j.nanoen.2016.06.042

Cited by 410 publications

(201 citation statements)

References 62 publications

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“…Typically, as is illustrated in Figure a, Bulk CN and BCN were synthesized from melamine at 550 °C and 600 °C, respectively. And then, UCN was obtained by heating Bulk CN at 550 °C according to our previous report . UBCN was prepared by further calcination of BCN at 600 °C.…”

Section: Resultsmentioning

confidence: 99%

“…For another, the charge migration distance from the interior to the surface can be shortened due to the reduced thickness of UCN, and then the charge separation/migration efficiency can be improved . Moreover, the larger bandgap of UCN leads to a stronger redox ability . Thus, profiting from the benefits mentioned above, the photocatalytic performance can be promoted to a great degree.…”

Section: Introductionmentioning

confidence: 99%

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Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

She

Chen

et al. 2020

ChemCatChem

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Broadband light absorption and excellent charge separation/migration efficiency are two important indicators for promising photocatalyst. However, realizing the above two aspects simultaneously is still a challenge. Here, an ultrathin and broadband carbon nitride (UBCN) is synthesized via a short‐time thermal oxidation process. The as‐prepared UBCN exhibits outstanding photocatalytic H2 generation activity (240.60 μmol h−1) under irradiation with λ>400 nm. Moreover, UBCN can work under irradiation with a longer wavelength (λ>500 nm), the corresponding H2 evolution rate is 5.08 μmol h−1, which is 14.8 times higher than that of bulk carbon nitride (Bulk CN). The excellent photocatalytic performance should be credited to the efficient charge separation/migration (the ultrathin structure) and the extended light absorption range. This work provides a simple and convenient strategy to prepare broadband and ultrathin metal‐free photocatalytic materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

She

Chen

et al. 2020

ChemCatChem

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“…Bulk g‐C 3 N 4 (BCN) has limited visible‐light absorption ability and also suffers from a low separation efficiency of photoexcited charge carriers, resulting in low photocatalytic activity . Aiming at improving the photocatalytic performance of g‐C 3 N 4 , various strategies have been developed, such as heteroatoms doping, nanostructure design, dye sensitization, and coupling with other semiconductors or conductors . Particularly, the introduction of nitrogen defects into the g‐C 3 N 4 framework was recently developed as an effective strategy to significantly enhance the photocatalytic activity of g‐C 3 N 4 under visible light .…”

Section: Introductionmentioning

confidence: 99%

Photoassisted Construction of Holey Defective g‐C₃N₄ Photocatalysts for Efficient Visible‐Light‐Driven H₂O₂ Production

Shi

Yang

Zhou

et al. 2018

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Holey defective g-C N photocatalysts, which are easily prepared via a novel photoassisted heating process, are reported. The photoassisted treatment not only helps to create abundant holes, endowing g-C N with more exposed catalytic active sites and crossplane diffusion channels to shorten the diffusion distance of both reactants from the surface to bulk and charge carriers from the bulk to surface, but also introduces nitrogen vacancies in the tri-s-triazine repeating units of g-C N , inducing the narrowing of intrinsic bandgap and the formation of defect states within bandgap to extend the visible-light absorption range and suppress the radiative electron-hole recombination. As a result, the holey defective g-C N photocatalysts show much higher photocatalytic activity for H O production with optimized enhancement up to ten times higher than pristine bulk g-C N . The newly developed synthetic strategy adopted here enables the sufficient utilization of solar energy and shows rather promising for the modification of other materials for efficient energy-related applications.

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“…2D g‐C 3 N 4 was prepared by a multi‐step calcination method . Melamine (2 g) was heated at 550 °C for 4 h in air atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Designing Visible‐Light‐Driven Z‐scheme Catalyst 2D g‐C₃N₄/Bi₂MoO₆: Enhanced Photodegradation Activity of Organic Pollutants

Xia

Mao

Chen

et al. 2018

Physica Status Solidi (a)

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Photocatalysis is a promising technology to solve the environment problems. Charge separation efficiency and oxidation capability are both vital factor determining the performance of photocatalysts. In this work, 2D g‐C3N4 is applied to modify Bi2MoO6 via an in situ hydrothermal method to design visible‐light‐driven Z‐scheme catalyst. The principle of this structure is to use the opposite surface charge of each component, maintaining the strong redox ability of photogenerated electrons and holes, preventing the recombination of photogenerated carrier effectively. As expected, the photodegradation performance of as‐prepared composites enhances dramatically compared with the pure Bi2MoO6. Afterward, kinetics and probable reaction mechanism are investigated and analyzed. It is proved that photogenerated carrier can be separated rapidly by tightly all‐solid‐state Z‐scheme junction. This work can provide a sight for finding controllable synthesis route of obtaining newly efficient visible‐light‐driven Z‐scheme photocatalysts.

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Oxygenated monolayer carbon nitride for excellent photocatalytic hydrogen evolution and external quantum efficiency

Cited by 410 publications

References 62 publications

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

Photoassisted Construction of Holey Defective g‐C₃N₄ Photocatalysts for Efficient Visible‐Light‐Driven H₂O₂ Production

Designing Visible‐Light‐Driven Z‐scheme Catalyst 2D g‐C₃N₄/Bi₂MoO₆: Enhanced Photodegradation Activity of Organic Pollutants

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Oxygenated monolayer carbon nitride for excellent photocatalytic hydrogen evolution and external quantum efficiency

Cited by 410 publications

References 62 publications

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H2 Generation

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H2 Generation

Photoassisted Construction of Holey Defective g‐C3N4 Photocatalysts for Efficient Visible‐Light‐Driven H2O2 Production

Designing Visible‐Light‐Driven Z‐scheme Catalyst 2D g‐C3N4/Bi2MoO6: Enhanced Photodegradation Activity of Organic Pollutants

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Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

Short‐time Thermal Oxidation of Ultrathin and Broadband Carbon Nitride for Efficient Photocatalytic H₂ Generation

Photoassisted Construction of Holey Defective g‐C₃N₄ Photocatalysts for Efficient Visible‐Light‐Driven H₂O₂ Production

Designing Visible‐Light‐Driven Z‐scheme Catalyst 2D g‐C₃N₄/Bi₂MoO₆: Enhanced Photodegradation Activity of Organic Pollutants