A solid-state chemical reduction approach to synthesize graphitic carbon nitride with tunable nitrogen defects for efficient visible-light photocatalytic hydrogen evolution

Zhang, Yizeng; Gao, Junning; Chen, Zhiwu

doi:10.1016/j.jcis.2018.10.012

Cited by 91 publications

(41 citation statements)

References 67 publications

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“…The order of photocurrent densities of all sample arranged in the following order: CN < CN-0 < CN-0.2 < CN-0.6 < CN-0.4. Such intensive photocurrent density of CN-0.4 indicates that CN-0.4 possesses the largest carrier mobility and minimum carrier recombination rate, which is in accord with the PL result [37,45]. Fig.…”

Section: Resultssupporting

confidence: 82%

“…It is observed that CN-0.4 exhibits the lowest arc radius, indicating that CN-0.4 exhibits a fast charge transfer rate. This result further testify the our OCN samples exhibit an improvement of charge transfer rate, which is beneficial for enhancing its photocatalytic performance [5,37,45].…”

Section: Resultssupporting

confidence: 75%

“…4(a) shows the XRD patterns of CN, CN-0, CN-0.2, CN-0.4 and CN-0.6. The bulk CN exhibits two peaks at about 13.1°and 27.3°, which are ascribed to in-plane tri-s-triazine units (1 0 0) and inter-planar stacking of conjugated aromatic systems (0 0 2), respectively [44,45]. Compared to bulk CN, the (1 0 0) peak of OCN samples is almost invisible, indicating that the OCN samples possess the smaller planar size of the layers [46,47].…”

Section: Resultsmentioning

confidence: 99%

“…4(f). Both samples display two distinct peaks at 157.6 and 165.5 ppm, which are assigned to the C 3N (1) and C 2N-NHx (2) of heptazines, respectively [45,52]. Compare to bulk CN, two small splits at 158.3 (3) and 166.4 (4) ppm arise in the 13 C NMR spectra of CN-0.4, indicating that C-O-C bond has been formed, further demonstrating that oxygen atom has been doped in g-C 3 N 4 [53].…”

Section: Resultsmentioning

confidence: 99%

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Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Zhang

Chen

et al. 2021

Journal of Energy Chemistry

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138

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Zhang

Chen

et al. 2021

Journal of Energy Chemistry

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138

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“…To confirm the actual doping site of B atoms, solid 13 C NMR analyses were conducted. Figure c shows that both pure g‐C 3 N 4 and 1%B/g‐C 3 N 4 exhibit two obvious peaks located at 156.4 and 164.3 ppm, which are ascribed to the chemical shifts of C at the different position of C–N aromatic rings (Figure d) . No new peak appears in 1%B/g‐C 3 N 4 , indicating B did not directly coordinate with C. Moreover, as shown in Figure S12 (Supporting Information), obvious peak located at 7.66 ppm can be ascribed to the ‐BN 2 .…”

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confidence: 94%

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

et al. 2019

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The photoreduction of CO2 to hydrocarbon products has attracted much attention because it provides an avenue to directly synthesize value‐added carbon‐based fuels and feedstocks using solar energy. Among various photocatalysts, graphitic carbon nitride (g‐C3N4) has emerged as an attractive metal‐free visible‐light photocatalyst due to its advantages of earth‐abundance, nontoxicity, and stability. Unfortunately, its photocatalytic efficiency is seriously limited by charge carriers′ ready recombination and their low reaction dynamics. Modifying the local electronic structure of g‐C3N4 is predicted to be an efficient way to improve the charge transfer and reaction efficiency. Here, boron (B) is doped into the large cavity between adjacent tri‐s‐triazine units via coordination with two‐coordinated N atoms. Theoretical calculations prove that the new electron excitation from N (2px, 2py) to B (2px, 2py) with the same orbital direction in B‐doped g‐C3N4 is much easier than N (2px, 2py) to C 2pz in pure g‐C3N4, and improves the charge transfer and localization, and thus the reaction dynamics. Moreover, B atoms doping changes the adsorption of CO (intermediate), and can act as active sites for CH4 production. As a result, the optimal sample of 1%B/g‐C3N4 exhibits better selectivity for CH4 with ≈32 times higher yield than that of pure g‐C3N4.

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Defective Graphitic Carbon Nitride Modified Separators with Efficient Polysulfide Traps and Catalytic Sites for Fast and Reliable Sulfur Electrochemistry

Tong

Huang

Liu

et al. 2021

Adv Funct Materials

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The serious shuttle effect of lithium‐sulfur batteries limits the efficient realization of high rate charging and discharging under high sulfur loading in practical applications. Herein, this work reports a strong mitigation toward lithium polysulfide (LiPSs) adsorption/catalysis by introducing defective graphite phase carbon nitride (g‐C3N4) as an effective additive. Without significant weight increase, the nitrogen deficient g‐C3N4, in the form of ultrafine spindle‐like nitrogen deficient g‐C3N4−x (sCN), can be easily combined with commercial poly‐propylene (PP) separators after hydrophilic modification of polydopamine, which corresponds to an ultralow overall weightiness contribution of 0.17 mg cm−2. Physical/electrochemical characterizations and theoretical studies reveal that sCN exhibits strong electrostatic attraction with LiPSs by nitrogen defects and new formation of cyano groups near edges, thereby maintaining rapid and reliable LiS electrochemistry. Of particular importance is the chainmail catalyst design with separators that enable magic polysulfides adsorption effect and desirable thermostability/wettability, which guarantees the sCNPP‐assembled cells with long and stable durability over 500 cycles at 5.0 C (capacity fading rate: 0.05% per cycle), and a high capability of 476 mAh g−1 is obtained.

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A solid-state chemical reduction approach to synthesize graphitic carbon nitride with tunable nitrogen defects for efficient visible-light photocatalytic hydrogen evolution

Cited by 91 publications

References 67 publications

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

Defective Graphitic Carbon Nitride Modified Separators with Efficient Polysulfide Traps and Catalytic Sites for Fast and Reliable Sulfur Electrochemistry

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A solid-state chemical reduction approach to synthesize graphitic carbon nitride with tunable nitrogen defects for efficient visible-light photocatalytic hydrogen evolution

Cited by 91 publications

References 67 publications

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO2 to CH4

Defective Graphitic Carbon Nitride Modified Separators with Efficient Polysulfide Traps and Catalytic Sites for Fast and Reliable Sulfur Electrochemistry

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Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄