Which kind of nitrogen chemical states doped carbon dots loaded by g-C3N4 is the best for photocatalytic hydrogen production

Zhang, Shuaiyang; Gao, Mengjie; Zhai, Yunpu; Wen, Jiaqi; Yu, Jingkun; He, Tiwei; Kang, Zhenhui; Lu, Siyu

doi:10.1016/j.jcis.2022.04.165

Cited by 62 publications

(13 citation statements)

References 55 publications

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“…Thus, researchers have proposed numerous strategies to boost the photocatalytic activity of g-C 3 N 4 -based materials for H 2 production. For example, the g-C 3 N 4 /carbon-dot-based nanocomposites, which possess enormous visible light absorption and applicable energy structures, have been prepared and serve as efficacious photocatalysts in photocatalytic water splitting for H 2 generation under light illumination [ 128 , 134 , 136 , 137 ]. Gao et al reported hexagonal tubular g-C 3 N 4 /CD-based nanocomposites which exhibited nine times higher than bulk g-C 3 N 4 in H 2 production rate [ 134 ] and related results indicated that CDs performed as both photosensitizer and electron acceptor.…”

Section: Photocatalytic Application In Energy and Environmental Susta...mentioning

confidence: 99%

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Wang

Huang

et al. 2023

Molecules

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Graphitic carbon nitride (g-C3N4), with facile synthesis, unique structure, high stability, and low cost, has been the hotspot in the field of photocatalysis. However, the photocatalytic performance of g-C3N4 is still unsatisfactory due to insufficient capture of visible light, low surface area, poor electronic conductivity, and fast recombination of photogenerated electron-hole pairs. Thus, different modification strategies have been developed to improve its performance. In this review, the properties and preparation methods of g-C3N4 are systematically introduced, and various modification approaches, including morphology control, elemental doping, heterojunction construction, and modification with nanomaterials, are discussed. Moreover, photocatalytic applications in energy and environmental sustainability are summarized, such as hydrogen generation, CO2 reduction, and degradation of contaminants in recent years. Finally, concluding remarks and perspectives on the challenges, and suggestions for exploiting g-C3N4-based photocatalysts are presented. This review will deepen the understanding of the state of the art of g-C3N4, including the fabrication, modification, and application in energy and environmental sustainability.

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Section: Photocatalytic Application In Energy and Environmental Susta...mentioning

confidence: 99%

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Wang

Huang

et al. 2023

Molecules

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“…The significant increase in the surface potential difference of R1-CQDs/CN compared to PCN suggests the presence of a strong internal electric field that can facilitate photogenerated carrier separation during photocatalysis . We attribute this effect to the abundant pyrrolic-N and oxygen-containing surface groups of R1-CQDs, which play a key role in separating photogenerated electrons and holes between the two phases and enhancing the photocatalytic efficiency. − …”

Section: Resultsmentioning

confidence: 94%

Functional Group Modulation in Carbon Quantum Dots for Accelerating Photocatalytic CO₂ Reduction

Liu

Hou

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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This study investigates the mechanism behind the enhanced photocatalytic performance of carbon quantum dot (CQD)-induced photocatalysts. Red luminescent CQDs (R-CQDs) were synthesized using a microwave ultrafast synthesis strategy, exhibiting similar optical and structural properties but varying in surface functional group sites. Model photocatalysts were synthesized by combining R-CQDs with graphitic carbon nitride (CN) using a facile coupling technique, and the effects of different functionalized R-CQDs on CO2 reduction were investigated. This coupling technique narrowed the band gap of R1-CQDs/CN, made the conduction band potentials more negative, and made photogenerated electrons and holes less likely to recombine. These improvements greatly enhanced the deoxygenation ability of the photoinduced carriers, increased light absorption of solar energy, and raised the carrier concentration, resulting in excellent stability and remarkable CO production. R1-CQDs/CN demonstrated the highest photocatalytic activity, with CO production up to 77 μmol g–1 within 4 h, which is approximately 5.26 times higher than that of pure CN. Our results suggest that the superior photocatalytic performance of R1-CQDs/CN arises from its strong internal electric field and high Lewis acidity and alkalinity, attributed to the abundant pyrrolic-N and oxygen-containing surface groups, respectively. These findings offer a promising strategy for producing efficient and sustainable CQD-based photocatalysts to address global energy and environmental problems.

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“…The enhanced collection of photons is benecial for the production of more photogenerated carriers. 52 The interfacial charge transport properties and photogenerated charge separation behavior of photocatalysts were assessed by electrochemical impedance spectroscopy (EIS) and the transient photocurrent response test, respectively. 53,54 Generally, the smaller semicircle radius of the EIS spectrum indicates more efficient transport of photogenerated carriers.…”

Section: Inuence Factors Of Photocatalytic Activitymentioning

confidence: 99%

The 2D van der Waals heterojunction MoC@NG@CN for enhanced photocatalytic hydrogen production

Tan

Yao

et al. 2023

J. Mater. Chem. A

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Which kind of nitrogen chemical states doped carbon dots loaded by g-C3N4 is the best for photocatalytic hydrogen production

Cited by 62 publications

References 55 publications

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Functional Group Modulation in Carbon Quantum Dots for Accelerating Photocatalytic CO₂ Reduction

The 2D van der Waals heterojunction MoC@NG@CN for enhanced photocatalytic hydrogen production

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Which kind of nitrogen chemical states doped carbon dots loaded by g-C3N4 is the best for photocatalytic hydrogen production

Cited by 62 publications

References 55 publications

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Recent Advances in g-C3N4-Based Materials and Their Application in Energy and Environmental Sustainability

Functional Group Modulation in Carbon Quantum Dots for Accelerating Photocatalytic CO2 Reduction

The 2D van der Waals heterojunction MoC@NG@CN for enhanced photocatalytic hydrogen production

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Functional Group Modulation in Carbon Quantum Dots for Accelerating Photocatalytic CO₂ Reduction