Graphitic Carbon Nitride Film: An Emerging Star for Catalytic and Optoelectronic Applications

Bian, Juncao; Huang, Chao; Zhang, Ruiqin

doi:10.1002/cssc.201600863

Cited by 96 publications

(56 citation statements)

References 114 publications

(249 reference statements)

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“…Especially, photocatalytic H 2 production is a clean and promising approach to harvest, convert, and store solar energy in the simplest chemical compound (H 2 ) . Since the first report by Fujishima and Honda on photoelectrochemical water splitting using a titania electrode, various strategies have been adopted to develop highly active, robust, and cost effective photocatalysts and photoelectrodes . In particular, a universal strategy is to construct heterostructured photocatalysts through assembling different building blocks by various physical/chemical interactions (e.g., covalent bonding, ionic bonding, hydrogen bonding, Van der Waals (VDW) force and coulomb force) .…”

mentioning

confidence: 99%

Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production

et al. 2018

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The generation of green hydrogen (H ) energy using sunlight is of great significance to solve the worldwide energy and environmental issues. Particularly, photocatalytic H production is a highly promising strategy for solar-to-H conversion. Recently, various heterostructured photocatalysts with high efficiency and good stability have been fabricated. Among them, 2D/2D van der Waals (VDW) heterojunctions have received tremendous attention, since this architecture can promote the interfacial charge separation and transfer and provide massive reactive centers. On the other hand, currently, most photocatalysts are composed of metal elements with high cost, limited reserves, and hazardous environmental impact. Hence, the development of metal-free photocatalysts is desirable. Here, a novel 2D/2D VDW heterostructure of metal-free phosphorene/graphitic carbon nitride (g-C N ) is fabricated. The phosphorene/g-C N nanocomposite shows an enhanced visible-light photocatalytic H production activity of 571 µmol h g in 18 v% lactic acid aqueous solution. This improved performance arises from the intimate electronic coupling at the 2D/2D interface, corroborated by the advanced characterizations techniques, e.g., synchrotron-based X-ray absorption near-edge structure, and theoretical calculations. This work not only reports a new metal-free phosphorene/g-C N photocatalyst but also sheds lights on the design and fabrication of 2D/2D VDW heterojunction for applications in catalysis, electronics, and optoelectronics.

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confidence: 99%

Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production

et al. 2018

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“…Methods for the thin film deposition of pCN have recently been addressed by different gas-phase techniques which, however, still suffer from poor deposition quality, i.e., low homogeneity and/ or high roughness. [6,8] Due to the promising characteristics and the potential to significantly drive innovation, a synthesis of pCN thin films is strongly required. Recently, Aida and co-workers were first to produce transparent pCN coatings.…”

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confidence: 99%

Shine Bright Like a Diamond: New Light on an Old Polymeric Semiconductor

et al. 2020

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Brilliance usually refers to the light reflected by the facets of a gemstone such as diamond due to its high refractive index. Nowadays, high‐refractive‐index materials find application in many optical and photonic devices and are mostly of inorganic nature. However, these materials are usually obtained by toxic or expensive production processes. Herein, the synthesis of a thin‐film organic semiconductor, namely, polymeric carbon nitride, by thermal chemical vapor deposition is presented. Among polymers, this organic material combines the highest intrinsic refractive index reported so far with high transparency in the visible spectrum, even reaching the range of diamond. Eventually, the herein presented deposition of high quality thin films and their optical characteristics open the way for numerous new applications and devices in optics, photonics, and beyond based on organic materials.

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“…On the other hand, the film thickness decreases for g‐CN500. Due to the nanosize effect of g‐CN film, more splitting in the energy levels occurs in replacement of the energy bands, which contributes to the blue shift of the PL peaks of g‐CN500.…”

Section: Resultsmentioning

confidence: 99%

“…However, the uniformity of such films is always unsatisfying, and the weak adhesion of the powder to the surface leads to poor performance and stability. How to fabricate a dense and uniform g‐CN film has become a main obstacle for its use in high‐quality electronic, optoelectronic and PEC devices . Applications of g‐CN films in these areas have been enabled by new methods for the direct synthesis of g‐CN films on substrates.…”

Section: Introductionmentioning

confidence: 99%

C=C π Bond Modified Graphitic Carbon Nitride Films for Enhanced Photoelectrochemical Cell Performance

Bian

et al. 2017

Chemistry An Asian Journal

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Applications of graphitic carbon nitride (g-CN) in photoelectrochemical and optoelectronic devices are still hindered due to the difficulties in synthesis of g-CN films with tunable chemical, physical and catalytic properties. Herein we present a general method to alter the electronic and photoelectrochemical properties of g-CN films by annealing. We found that N atoms can be removed from the g-CN networks after annealing treatment. Assisted by theoretical calculations, we confirm that upon appropriate N removal, the adjacent C atoms will form new C=C π bonds. Detailed calculations demonstrate that the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) are located at the structure unit with C=C π bonds and the electrons are more delocalized. Valence band X-ray photoelectron spectroscopy spectra together with optical absorption spectra unveil that the structure changes result in the alteration of the g-CN energy levels and position of band edges. Our results show that the photocurrent density of the annealed g-CN film is doubled compared with the pristine one, thanks to the better charge separation and transport within the film induced by the new C=C π bonds. An ultrathin TiO film (2.2 nm) is further deposited on the g-CN film as stabilizer and the photocurrent density is kept at 0.05 mA cm at 1.23 V versus reversible hydrogen electrode after two-cycle stability assessment. This work enables the applications of g-CN films in many electronic and optoelectronic devices.

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Graphitic Carbon Nitride Film: An Emerging Star for Catalytic and Optoelectronic Applications

Cited by 96 publications

References 114 publications

Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production

Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production

Shine Bright Like a Diamond: New Light on an Old Polymeric Semiconductor

C=C π Bond Modified Graphitic Carbon Nitride Films for Enhanced Photoelectrochemical Cell Performance

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Graphitic Carbon Nitride Film: An Emerging Star for Catalytic and Optoelectronic Applications

Cited by 96 publications

References 114 publications

Metal‐Free 2D/2D Phosphorene/g‐C3N4 Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H2 Production

Metal‐Free 2D/2D Phosphorene/g‐C3N4 Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H2 Production

Shine Bright Like a Diamond: New Light on an Old Polymeric Semiconductor

C=C π Bond Modified Graphitic Carbon Nitride Films for Enhanced Photoelectrochemical Cell Performance

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Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production

Metal‐Free 2D/2D Phosphorene/g‐C₃N₄ Van der Waals Heterojunction for Highly Enhanced Visible‐Light Photocatalytic H₂ Production