Revisiting the roles of dopants in g-C3N4nanostructures for piezo-photocatalytic production of H2O2: a case study of selenium and sulfur

Tran, Dat Do; Thanh, Vuong Hoai; Nguyen, Duc‐Viet; Ly, Pho Phuong; Phan, Pham Duc Minh; Khoi, Vu Hoang; Thanh, Phong; Hieu, Nguyen Huu

doi:10.1039/d2na00909a

Cited by 13 publications

(9 citation statements)

References 72 publications

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“…The CN pattern has two distinct peaks at 13° and 27.8°, corresponding to the (100) and (002) planes of the graphitic structures, respectively. While the former peak can be explained by the repetition of heptazine units in g-C 3 N 4 structures, the latter demonstrates the stacking between layers in the lattice . In addition, the pattern of CdS validates the features of CdS crystals in the materials.…”

Section: Resultssupporting

confidence: 57%

“…While the former peak can be explained by the repetition of heptazine units in g-C 3 N 4 structures, the latter demonstrates the stacking between layers in the lattice. 21 In addition, the pattern of CdS validates the features of CdS crystals in the materials. However, fabricated CdS presents two crystallization phases, hexagonal and cubic structures, based on comparison with JCPDS no.…”

Section: Crystallization and Morphological Characterizationsmentioning

confidence: 57%

“…Additionally, an increase in performance was captured with the combination of both parameters, implying synergistic effects in the system. In a previous study, the roles of ultrasonic waves were explained with the adsorption–desorption theory . Particularly, catalytic efficiency relies on the adsorption of reactants on the catalyst’s surface.…”

Section: Resultsmentioning

confidence: 99%

“…In a previous study, the roles of ultrasonic waves were explained with the adsorption−desorption theory. 21 Particularly, catalytic efficiency relies on the adsorption of reactants on the catalyst's surface. With the appropriate sonication, the surface may be occupied by a suitable number of adsorbates.…”

Section: Physical and Chemical Propertiesmentioning

confidence: 99%

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S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

Phan,

Nguyen,

Anh

et al. 2023

ACS Appl. Nano Mater.

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Sustainability in catalysis is increasingly becoming the primary target in academic and industrial studies. Regarding the material perspective, designing heterojunction nanocatalysts to produce small molecules, such as hydrogen peroxide (H 2 O 2 ), has been an attractive research theme in recent decades. Nonetheless, most reported materials suffer from a complicated synthetic process with various steps and using unbenign solvents, hindering practical applications on an industrial scale. This study proposed a facile one-step way to fabricate heterostructured CdS/g-C 3 N 4 nanocatalysts to produce H 2 O 2 from water and oxygen under light and ultrasound irradiation. The results showed that the formation of H 2 O 2 mainly relies on oxygen radical species. Oxygen is initially converted into superoxide via excited electrons from CdS, followed by the formation of singlet oxygen from the oxidation process in g-C 3 N 4 sites. Interestingly, the formation of H 2 O 2 in an inert atmosphere is associated with the in situ evolution of oxygen from water oxidation due to the suitable electronic band position of g-C 3 N 4 to drive multioxidation reactions. Charge transfer characterizations illustrate the S-scheme mechanism in the catalytic process, giving a better understanding of the charge transportation phenomenon, thus providing a critical pathway in designing and developing heterojunction materials for catalysis with easier catalyst preparation and operation processes. KEYWORDS: g-C 3 N 4 , CdS, solid-state synthesis, S-scheme heterojunctions, H 2 O 2 , piezo-photocatalysis

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Section: Resultssupporting

confidence: 57%

Section: Crystallization and Morphological Characterizationsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Physical and Chemical Propertiesmentioning

confidence: 99%

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S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

Phan,

Nguyen,

Anh

et al. 2023

ACS Appl. Nano Mater.

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“…Graphitic carbon nitride has become an emerging material for sustainable H 2 O 2 production, and piezo-photocatalytic technology is currently in the limelight because of its eco-friendly character. In this regard, Tran and team performed single-step heteroatom (S and Se) doping, taking different dopant precursors on pristine g-C 3 N 4 and studying their effect on piezo-photocatalytic H 2 O 2 production. Pristine g-C 3 N 4 depicts low piezoactivity, but upon doing so, the performance increases significantly due to the introduction of noncentrosymmetry in the graphitic structure.…”

Section: Recent Advancements In Piezoelectric Field Induced Solar H2o...mentioning

confidence: 99%

Recent Advancement in Piezopolarization Induced Photocatalytic H₂O₂ Production: Fundamentals, Theoretical Insights, and Future Endeavors

Mansingh,

Priyadarshini,

Panda

et al. 2024

Energy Fuels

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Currently, piezopolarization-driven photocatalysis has emerged as a promising sustainable technology for proficient solar-to-chemical conversion efficiency. The piezoelectric field generated by mechanical deformation was found to be an effective strategy for energy band modulation alongside effective separation/transfer of carriers. This review summarizes the fundamentals of piezopotential-based catalysis, particularly for piezophotocatalysis and the associated H 2 O 2 production. This review also describes the detailed piezo-operational mechanism, peroxide formation pathway, and different detection/ quantification techniques. Further, we have thoroughly discussed the theoretical insights of piezopolarization referring to suitable reported literature. We have also discussed several recently reported state-of-the-art systems on piezo-photocatalytic H 2 O 2 evolution reactions. Finally, the summary and future prospective section highlights the connected challenges and insightful new ideas for the scientific community to completely comprehend the science of piezo-photocatalysis and develop efficient systems for green energy and environmental applications.

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Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels

Ly,

Nguyen,

Luu

et al. 2023

Advanced Sustainable Systems

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Elucidating the impact of heteroatoms in graphitic carbon nitrides (g‐C3N4) is of utmost importance to rationalize materials. Hence, in this study, oxygen‐doped g‐C3N4 containing trace amounts of halogen in the structures for piezo‐photosynthesis of hydrogen peroxides (H2O2) is fabricated. The findings reveal that oxygen atoms may be inserted into g‐C3N4 in‐plane structures, while halogen atoms tend to become intercalated between g‐C3N4 layers. Furthermore, the presence of ammonium molten salts (NH4X) during the synthesis alters the concentration of mono and cluster vacancies of carbon and nitrogen in the materials, certifying by positron annihilation spectroscopy (PAS). These defective contributions will be meaningfully accelerate catalytic performance by providing trapping states. Additionally, the decomposition of generated H2O2 can produce highly oxidative hydroxyl radicals, inducing degradations on the catalyst's structures and unexpectedly decreasing catalytic outcomes. From the mechanistic view, different reduction and oxidation channels will be play a pivotal role in generating H2O2. Moreover, the influence of ultrasound and light is also carefully investigated in the work to gain more insights into how the catalysts are triggered to improve catalytic performance. Thus, this study highlights the importance of carefully characterizing structures of g‐C3N4 to precisely understand the catalytic properties, benefiting catalytic design and development.

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Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

Abstract: Doping is an efficient technique to regulate and modify the structures of carbon-based materials. In this study, we explored the potential roles of doping precursors in generating H2O2 from oxygen and water under piezo-photocatalytic effects.

Cited by 13 publications

References 72 publications

S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

Recent Advancement in Piezopolarization Induced Photocatalytic H₂O₂ Production: Fundamentals, Theoretical Insights, and Future Endeavors

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels

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Revisiting the roles of dopants in g-C3N4nanostructures for piezo-photocatalytic production of H2O2: a case study of selenium and sulfur

Abstract: Doping is an efficient technique to regulate and modify the structures of carbon-based materials. In this study, we explored the potential roles of doping precursors in generating H2O2 from oxygen and water under piezo-photocatalytic effects.

Cited by 13 publications

References 72 publications

S-Scheme Heterostructured CdS/g-C3N4 Nanocatalysts for Piezo-Photocatalytic Synthesis of H2O2

S-Scheme Heterostructured CdS/g-C3N4 Nanocatalysts for Piezo-Photocatalytic Synthesis of H2O2

Recent Advancement in Piezopolarization Induced Photocatalytic H2O2 Production: Fundamentals, Theoretical Insights, and Future Endeavors

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H2O2 Production Channels

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Revisiting the roles of dopants in g-C₃N₄nanostructures for piezo-photocatalytic production of H₂O₂: a case study of selenium and sulfur

S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

S-Scheme Heterostructured CdS/g-C₃N₄ Nanocatalysts for Piezo-Photocatalytic Synthesis of H₂O₂

Recent Advancement in Piezopolarization Induced Photocatalytic H₂O₂ Production: Fundamentals, Theoretical Insights, and Future Endeavors

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels