High specific surface area defective g-C3N4 nanosheets with enhanced photocatalytic activity prepared by using glyoxylic acid mediated melamine

Cai, He; Han, Dongyuan; Wang, Xiaona; Cheng, Xiangxiang; Liu, Jing; Jia, Lan; Ding, Y.; Liu, Shixing; Fan, Xiaoxing

doi:10.1016/j.matchemphys.2020.123755

Cited by 30 publications

(10 citation statements)

References 42 publications

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“…The strategy of improving material performance through morphology control has been widely used in basic research and industrial production. − The morphology design of g-C 3 N 4 is more extensive, compared with bulk g-C 3 N 4 , − g-C 3 N 4 with 3D morphology (nanospheres, hollow tubes) has a larger specific surface area and active sites. Second, constructing a reasonable S-scheme heterojunction is also one of the efficient methods. , The S-scheme heterojunction consumes useless electrons and holes in the reaction system, improves the overall redox ability of the composite catalyst, shortens the electron transport path, and overcomes the shortcomings of type-II heterojunction. − Peng et al used a simple coprecipitation method to growth of CdS nanoparticles on MoO 3 nanosheets with a localized surface plasmon resonance (LSPR), and constructed an S-scheme heterojunction to efficiently enhance the catalyst activity.…”

Section: Introductionmentioning

confidence: 99%

Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Yan

Liu

Jin

2021

ACS Appl. Mater. Interfaces

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As the demand of fossil fuels continues to expand, hydrogen energy is considered a promising alternative energy. In this work, the NiTiO 3 −CuI-GD ternary system was successfully constructed based on morphology modulation and energy band structure design. First, the one-pot method was used to cleverly embed the cubes CuI in the stacked graphdiyne (GD) to prepare the hybrid CuI-GD, and CuI-GD was anchored on the surface of NiTiO 3 by simple physical stirring. The unique spatial arrangement of the composite catalyst was utilized to improve the hydrogen production activity under light. Second, to combine various characterization tools and energy band structures, we proposed an step-scheme (S-scheme) heterojunction photocatalytic reaction mechanism, among them, the tubular NiTiO 3 formed by the selfassembled of nanoparticles provided sufficient sites for the anchoring of CuI-GD, and the thin layer GD acted as an electron acceptor to capture a large number of electrons with the help of the conjugated carbon network; cubes CuI could consume holes in the reaction system; the loading of CuI-GD greatly improved the oxidation and reduction ability of the whole catalytic system. The S-scheme heterojunction accelerated the transfer of carriers and improved the separation efficiency. The experiment provides a new insight into the construction of an efficient and eco-friendly multicatalytic system.

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Section: Introductionmentioning

confidence: 99%

Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Yan

Liu

Jin

2021

ACS Appl. Mater. Interfaces

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“…In Figure c, EIS was used to research the electron transfer between different catalyst interfaces. CNFS-20 had the smallest radius, indicating that it had the least resistance when the interface charges migrate . Photoelectrochemical analysis showed that CNFS-20 has good conductivity and low overpotential after Co 3 S 4 modification, indicating that it is a highly efficient and excellent catalyst.…”

Section: Resultsmentioning

confidence: 98%

“…CNFS-20 had the smallest radius, indicating that it had the least resistance when the interface charges migrate. 59 Photoelectrochemical analysis showed that CNFS-20 has good conductivity and low overpotential after Co 3 S 4 modification, indicating that it is a highly efficient and excellent catalyst. In Figure 9d, the CB value of Fe 2 O 3 was positive, indicating that it did not had enough driving force to reduced H + under visible light to generate H 2 , which also explained why Fe 2 O 3 had no hydrogen production activity.…”

Section: 46mentioning

confidence: 98%

g-C₃N₄/α-Fe₂O₃ Supported Zero-Dimensional Co₃S₄ Nanoparticles Form S-Scheme Heterojunction Photocatalyst for Efficient Hydrogen Production

2020

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It is still a great challenge to develop photocatalysts with high efficiency and low cost to reach the scale of industrialization. In this work, we prepared an S-type heterojunction photocatalyst with Co3S4 nanoparticles supported on g-C3N4/α-Fe2O3. Characterizations, such as PL, UV–vis, electrochemical impedance spectroscopy, and linear sweep voltammetry, proved that the composite material had excellent photoelectrochemical performance and good stability. The hydrogen evolution amount of g-C3N4/α-Fe2O3/Co3S4 is as high as 191.41 μmol, which is about 30 times that of pure Co3S4 (6.38 μmol). The improvement performance of a composite material could be attributed to the following points: the EY molecules not only increase the light absorption rate of the samples but also act as electron donors; the highly dispersed Co3S4 nanoparticles provide a large number of reduction sites; and the constructed S-scheme heterojunction consumes useless electrons and holes in the hydrogen production system and utilizes the strong redox potential of the composite material to promote the separation of photogenerated carriers. In particular, Co3S4 nanoparticles with different degrees of dispersion were prepared by changing the preparation sequence of the composite catalyst. The design ideas of this experiment can provide an effective reference for the synthesis of efficient and stable multiple photocatalyst systems.

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“…The 2θ positions of the (002) peak are 27.4, 27.7, and 28.1°, for SCN500, SCN550, and SCN600, respectively. That shows that the interlayer distance decreases with increasing calcination temperature, and the crystallinity of the samples is higher at a higher calcination temperature. − The decrease in the interlayer distance may result from the introduction of nitrogen defects and S atoms in the polymeric carbon nitride structure by calcining trithiocyanuric acid and melamine, increasing the interlayer interaction of polymeric carbon nitride. The FTIR spectra in Figure c shows the characteristic peaks of polymeric carbon nitride as peaks located at 806 and 889 cm –1 for the stretching of the triazine ring, the peaks at 1238–1637 cm –1 for the stretching of the C–N heterocycles, and the broad peaks at 3085–3262 cm –1 for the stretching of N–H.…”

Section: Resultsmentioning

confidence: 99%

Chemical Cutting of Network Nodes in Polymeric Carbon Nitride for Enhanced Visible-Light Photocatalytic Hydrogen Generation

Bai

et al. 2021

ACS Appl. Nano Mater.

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Polymeric carbon nitride (C3N4) has been arising as an important semiconductor photocatalyst for photocatalytic hydrogen evolution and pollutant removal for solving the ever-pressing energy crisis and environmental issues. The crystallinity, degree of polymerization, and defect formation of the C3N4 molecular structure exhibit a profound effect on its photocatalytic performance. Herein, a facile method was proposed to introduce a certain amount of nitrogen vacancies in C3N4 by calcining trithiocyanuric acid and melamine at different temperatures. An optimal photocatalytic hydrogen evolution rate of 65.1 μmol·h–1 is achieved for catalyst SCN600, about 54 times that of pristine C3N4 (CN). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) observations showed that the introduction of nitrogen defects in polymeric carbon nitride molecules by cutting the network nodes is the main factor for enhancing the photocatalytic performance, in addition to the crystallinity and polymerization degree. Nitrogen defects induce the midgap energy level, increasing light utilization and facilitating charge transfer and separation. Density functional theory (DFT) simulations verified that cutting the network nodes increased the localized highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) states in polymeric carbon nitride, thus inhibiting electron–hole recombinations.

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High specific surface area defective g-C3N4 nanosheets with enhanced photocatalytic activity prepared by using glyoxylic acid mediated melamine

Cited by 30 publications

References 42 publications

Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

g-C₃N₄/α-Fe₂O₃ Supported Zero-Dimensional Co₃S₄ Nanoparticles Form S-Scheme Heterojunction Photocatalyst for Efficient Hydrogen Production

Chemical Cutting of Network Nodes in Polymeric Carbon Nitride for Enhanced Visible-Light Photocatalytic Hydrogen Generation

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High specific surface area defective g-C3N4 nanosheets with enhanced photocatalytic activity prepared by using glyoxylic acid mediated melamine

Cited by 30 publications

References 42 publications

Graphdiyne Based Ternary GD-CuI-NiTiO3 S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Graphdiyne Based Ternary GD-CuI-NiTiO3 S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

g-C3N4/α-Fe2O3 Supported Zero-Dimensional Co3S4 Nanoparticles Form S-Scheme Heterojunction Photocatalyst for Efficient Hydrogen Production

Chemical Cutting of Network Nodes in Polymeric Carbon Nitride for Enhanced Visible-Light Photocatalytic Hydrogen Generation

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Product

Resources

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Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

Graphdiyne Based Ternary GD-CuI-NiTiO₃ S-Scheme Heterjunction Photocatalyst for Hydrogen Evolution

g-C₃N₄/α-Fe₂O₃ Supported Zero-Dimensional Co₃S₄ Nanoparticles Form S-Scheme Heterojunction Photocatalyst for Efficient Hydrogen Production