On the electronic properties and catalytic activity of MoS2–C3N4 materials prepared by one-pot reaction

Ryaboshapka, Daria; Bargiela, Pascal; Piccolo, L.; Afanasiev, P.

doi:10.1016/j.ijhydene.2022.08.034

Cited by 7 publications

(4 citation statements)

References 66 publications

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“…Concretely, both photocatalytic performances were improved when the MoS 2 proportion was increased from 1% to 3%, after which the addition of MoS 2 would impair their performances. It is noted that the loading of MoS 2 on g-C 3 N 4 surface is not a purely physical superposition, but build a charge carrier transmitted heterojunction with potential energy barrier created . When the proportion of MoS 2 increased, the mutual surface contacting areas increased, resulting a stronger interlayer interaction, which could greatly promote the migration of photogenerated electron–hole pairs .…”

Section: Results and Discussionmentioning

confidence: 99%

“…It is noted that the loading of MoS 2 on g-C 3 N 4 surface is not a purely physical superposition, but build a charge carrier transmitted heterojunction with potential energy barrier created. 33 When the proportion of MoS 2 increased, the mutual surface contacting areas increased, resulting a stronger interlayer interaction, which could greatly promote the migration of photogenerated electron−hole pairs. 34 However, excessive MoS 2 would lead to counterproductive effects.…”

Section: Synthesis Of Photocatalysts Synthesis Of Polymeric G-c 3 Nmentioning

confidence: 99%

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Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Wu,

Wang,

Wang

et al. 2024

Langmuir

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Coupling heterostructures to synergistically improve the light adsorption and promote the charge carrier separation has been regarded as an operative approach to advance the photocatalytic performances. However, it is still challenging to construct heterostructures with appropriate optical properties and interfacial energy structures at the same time. In this work, a Z-scheme g-C 3 N 4 /rGO/MoS 2 ternary composite photocatalyst is successfully synthesized via an effective hydrothermal method. The as-synthesized g-C 3 N 4 /rGO/MoS 2 composite photocatalyst exhibited significant improvement for visible light absorption and boosted the separation efficiency of photoinduced electron−hole pairs. The g-C 3 N 4 /rGO/MoS 2 system exhibited optimum visible-light-induced photocatalytic activity in hydrogen (H 2 ) from water splitting and degrading pollutant rhodamin B (RhB), which is 22 times and 5 times higher than that of pure g-C 3 N 4 , respectively. The excellent photocatalytic activities are attributed to the synergetic effects of coupling rGO, g-C 3 N 4 , and MoS 2 ternary structures to the composite photocatalyst. These combinations of intimate two-dimensional nanoconjugations can effectively inhibit charge recombination and accelerate charge transfer kinetics, forming a Z-scheme-assisted photocatalytic mechanism, thereby exhibiting superior photocatalytic activity.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Synthesis Of Photocatalysts Synthesis Of Polymeric G-c 3 Nmentioning

confidence: 99%

Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Wu,

Wang,

Wang

et al. 2024

Langmuir

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“…Fu et al 23 and Liu et al 24 obtained hydrogen rates of 32.9 and 0.28 mmol•g −1 •h −1 with a solvothermal method, respectively. Ryaboshapka et al 25 obtained a hydrogen rate of 1.17 mmol•g −1 •h −1 by a facile solid-state method.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Electronic Properties and Photocatalytic Activity of z-Type g-C₃N₄@MoS₂ Heterostructures Prepared by a One-Step Calcination Method

Yang,

Zuo,

et al. 2024

J. Phys. Chem. C

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In the paper, g-C 3 N 4 /MoS 2 materials were prepared by using a one-step calcination method with Na 2 MoO 4 •2H 2 O and thiourea as precursors at different reaction temperatures and reaction rates. With the reaction temperature changing from 500 to 550 °C, the prepared composites were composed with MoS 2 and g-C 3 N 4 nanomaterials, where MoS 2 nanosheets were decorated with g-C 3 N 4 nanoflakes; up to 600 °C, the disappearance of g-C 3 N 4 typical features in FT-IR spectra implies that the composites were mainly consistent with MoS 2 ; further up to 700 °C, XRD patterns and Raman spectra revealed that the composites were composed with MoS 2 nanosheets. All of the prepared samples were used as photocatalysts for hydrogen production, and the highest H 2 production rate of 5.21 mmol•g −1 •h −1 was obtained for sample MC500-2 without a noble metal as a cocatalyst; the sample was prepared at 500 °C with a rate of 2 °C/min. The mechanism behind has been explained with band alignments. UPS and valence spectra revealed that the g-C 3 N 4 /MoS 2 heterostructure in sample MC500-2 is a z-type, which is favorable for the separation of the photogenerated electron−hole pairs. The results will be helpful for the preparation of MoS 2 and g-C 3 N 4 composites and their application in photocatalytic hydrogen production.

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“…To compensate for these drawbacks, scientists have made various attempts, such as building various nanostructures [4], surface modification [5], constructing heterojunctions [6], and doping with chemical elements [7]. Among the above strategies, surface modification has proved to be an effective way to tune the electronic structure of g-C 3 N 4 , achieve modulation of the bandgap, and enhance the photocatalytic activity [8].…”

Section: Introductionmentioning

confidence: 99%

Boosting the Photoreactivity of g-C3N4 towards CO2 Reduction by Polymerization of Dicyandiamide in Ammonium Chloride

Wang,

Chang,

et al. 2023

Catalysts

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As a typical organic semiconductor photocatalyst, graphitic carbon nitride (g-C3N4) suffers from low photocatalytic activity. In this paper, g-C3N4 was prepared by polymerization of dicyandiamide (C2H4N4) in the presence of ammonium chloride (NH4Cl). It was found that the addition of ammonium chloride can greatly improve the photocatalytic activity of g-C3N4 towards CO2 reduction. The optimal photocatalyst (CN-Cl 20) exhibited a CO2-to-CO conversion activity of 50.6 μmolg−1h−1, which is 3.1 times that of pristine bulk g-C3N4 (BCN) that was prepared in the absence of any ammonium chloride. The enhanced photoactivity of g-C3N4 was attributed to the combined effects of chloride modification and an enlarged specific surface area. Chloride modification of g-C3N4 can not only reduce the bandgap, but also causes a negatively shifted conduction band (CB) potential level, while ammonia (NH3) gas from the decomposition of NH4Cl can act as a gas template to exfoliate layered structure g-C3N4, improving the specific surface from 6.8 to 21.3 m2g−1. This study provides new ideas for the synthesis of highly efficient g-C3N4-based photocatalytic materials for CO2 conversion and utilization.

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On the electronic properties and catalytic activity of MoS2–C3N4 materials prepared by one-pot reaction

Cited by 7 publications

References 66 publications

Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Evolution of the Electronic Properties and Photocatalytic Activity of z-Type g-C₃N₄@MoS₂ Heterostructures Prepared by a One-Step Calcination Method

Boosting the Photoreactivity of g-C3N4 towards CO2 Reduction by Polymerization of Dicyandiamide in Ammonium Chloride

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On the electronic properties and catalytic activity of MoS2–C3N4 materials prepared by one-pot reaction

Cited by 7 publications

References 66 publications

Coupling Z-Scheme g-C3N4/rGO/MoS2 Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Coupling Z-Scheme g-C3N4/rGO/MoS2 Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Evolution of the Electronic Properties and Photocatalytic Activity of z-Type g-C3N4@MoS2 Heterostructures Prepared by a One-Step Calcination Method

Boosting the Photoreactivity of g-C3N4 towards CO2 Reduction by Polymerization of Dicyandiamide in Ammonium Chloride

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Product

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Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Coupling Z-Scheme g-C₃N₄/rGO/MoS₂ Ternary Heterojunction as an Efficient Visible Light Photocatalyst for Hydrogen Evolution and RhB Degradation

Evolution of the Electronic Properties and Photocatalytic Activity of z-Type g-C₃N₄@MoS₂ Heterostructures Prepared by a One-Step Calcination Method