Bandgap engineering in graphitic carbon nitride: Effect of precursors

Ragupathi, Veena; Panigrahi, Puspamitra; Subramaniam, N. Ganapathi

doi:10.1016/j.ijleo.2019.163601

Cited by 35 publications

(14 citation statements)

References 27 publications

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“…1a and the results accorded with JCPDS file no 87-1526. The appearance of (100) and (002) plane validates the existence of tri-s-triazine and aromatic units [6]. Fig.…”

Section: Resultsmentioning

confidence: 54%

Supercapacitive performance of exfoliated graphitic carbon nitride nanoflakes

Ragupathi

devaraj²,

Panigrahi³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Recently, Exfoliated graphitic carbon nitride (E-gCN) has drawn significant interest in the field of energy generation and storage. In this study, exfoliated graphitic carbon nitride nanoflakes are synthesized by condensation followed by ultrasonic exfoliation. The supercapative behavior of exfoliated graphitic carbon nitride is analyzed. Structural analyses confirm the formation of thiazine and heptazine heterocycles. Scanning electron microscopy image shows flake-like morphology. The E-gCN exhibit the specific capacitance of 160 F g−1 at 1 A g−1 and retains 96.2% capacity at 3000 cycles. The presence of nitrogen in the two-dimensional layered structure significantly increases the conductivity and alters the electronic structure. The nano-flake morphology increases the charge diffusion kinetics, which improve the charge storage mechanism.

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“…1a and the results accorded with JCPDS file no 87-1526. The appearance of (100) and (002) plane validates the existence of tri-s-triazine and aromatic units [6]. Fig.…”

Section: Resultsmentioning

confidence: 54%

Supercapacitive performance of exfoliated graphitic carbon nitride nanoflakes

Ragupathi

devaraj²,

Panigrahi³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The valence band X-ray photoelectron spectroscopy plot, which calculates the energy level difference between the valence band and the Fermi level [45], produced a value of 1.56 V for urea, thiourea and melamine [35,40], and 1.74 V for dicyandiamide [46]. Ragupathi et al [47] reported a band-gap of 2.89 eV, 2.78 eV, and 2.35 eV for thiourea, urea, and urea with glycine precursor to synthesize g−CN, respectively.…”

Section: Electronic Structure Of G−cnmentioning

confidence: 99%

Recent Progress on Photoelectrochemical Water Splitting of Graphitic Carbon Nitride (g−CN) Electrodes

Zhu

et al. 2022

Nanomaterials

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Graphitic carbon nitride (g−CN), a promising visible-light-responsive semiconductor material, is regarded as a fascinating photocatalyst and heterogeneous catalyst for various reactions due to its non-toxicity, high thermal durability and chemical durability, and “earth-abundant” nature. However, practical applications of g−CN in photoelectrochemical (PEC) and photoelectronic devices are still in the early stages of development due to the difficulties in fabricating high-quality g−CN layers on substrates, wide band gaps, high charge-recombination rates, and low electronic conductivity. Various fabrication and modification strategies of g−CN-based films have been reported. This review summarizes the latest progress related to the growth and modification of high-quality g−CN-based films. Furthermore, (1) the classification of synthetic pathways for the preparation of g−CN films, (2) functionalization of g−CN films at an atomic level (elemental doping) and molecular level (copolymerization), (3) modification of g−CN films with a co-catalyst, and (4) composite films fabricating, will be discussed in detail. Last but not least, this review will conclude with a summary and some invigorating viewpoints on the key challenges and future developments.

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“…The calcination process is a second step to prepare g-C 3 N 4 which is usually performed at temperatures ranging from 350 to 650 °C in air/inert atmosphere. The thermal treatment significantly influences the final physicochemical features of g-C 3 N 4 (such as morphologies, [2] light absorption, [41] porosity, [42][43][44] band gap, [18,85,116] photoluminescence [117] and catalytic performance [118] ). TGA [119] is a procedure in which the mass of a sample is measured over time as the temperature changes.…”

Section: Calcination Of the Supramolecular Assemblymentioning

confidence: 99%

Solvent‐Assisted Synthesis of Supramolecular‐Assembled Graphitic Carbon Nitride for Visible Light Induced Hydrogen Evolution – A Review

et al. 2021

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Many graphitic carbon nitride (g‐C3N4)‐based photocatalysts have attracted a significant interest because of the unique arrangement of carbon and nitrogen atoms. Changeable morphologies with tunable bandgap of g‐C3N4 materials were used in many applications including batteries, photovoltaics, photocatalysts, sensors, etc. This review focuses on the recent progress in the solvent assisted supramolecular‐assembled carbon nitride preparation for visible light induced hydrogen evolution from water. The synthesis involves tailoring the supramolecular assembly from different monomers followed by calcination. Different types of non‐covalent interactions between the monomers have been explained. In addition, the crucial role of solvent has been re‐counted in terms of the alteration of the structural morphology of assemblies. The mechanistic pathways of interaction in the formation of supramolecular assemblies have been also documented by molecular dynamics simulation. Finally, visible light triggered hydrogen evolution has been demonstrated along with discussion on challenges and future research direction.

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Bandgap engineering in graphitic carbon nitride: Effect of precursors

Cited by 35 publications

References 27 publications

Supercapacitive performance of exfoliated graphitic carbon nitride nanoflakes

Supercapacitive performance of exfoliated graphitic carbon nitride nanoflakes

Recent Progress on Photoelectrochemical Water Splitting of Graphitic Carbon Nitride (g−CN) Electrodes

Solvent‐Assisted Synthesis of Supramolecular‐Assembled Graphitic Carbon Nitride for Visible Light Induced Hydrogen Evolution – A Review

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