Anti-defect Engineering of Crystalline g-C₃N₄ Nanostructures for Efficient Photocatalytic In Situ H₂O₂ Production

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(5), P. 3927 - 3935

Published: Feb. 27, 2023

How to realize on-site small-scale production and sustainable consumption of H2O2 is the focus attention this study. Photocatalysis technology can just meet demand, g-C3N4 one most popular catalysts employed. However, numerous defects in nanostructure seriously inhibit its catalytic activity, which act as recombination centers photogenerated carriers. Herein, we propose an anti-defect engineering strategy tailor a highly crystalline for efficient photocatalytic situ production, be further cascaded wastewater remediation. High-resolution transmission electron microscopy spin-resonance spectroscopy results demonstrate that successfully fabricated with extremely low defect concentrations. Transient surface photovoltage data shows exhibits rapid charge separation transfer slow decay. Therefore, activity significantly promoted by eliminating construct structure. Especially, prepared thiourea (CNT) maximum 2.48 mmol g–1 h–1 apparent quantum efficiency 22% (λ = 400 nm), along excellent cascade tetracycline removal effect. This work provides regulate crystal structure catalyst enhanced activity.

Language: Английский

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Carbon quantum dots from tea enhance z-type BiOBr/C3N4 heterojunctions for RhB degradation: Catalytic effect, mechanisms, and intermediates

Applied Surface Science, Journal Year: 2023, Volume and Issue: 639, P. 158254 - 158254

Published: Aug. 13, 2023

Language: Английский

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Constructing Robust Interfacial Chemical Bond Enhanced Charge Transfer in S‐Scheme 3D/2D Heterojunction for CO₂ Photoreduction

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: May 10, 2024

Abstract A stable ZnTe@Cs 3 Sb 2 I 9 catalyst with 3D/2D‐hollow‐composite structure is constructed for CO photocatalytic reduction via the in situ growth of Cs nanosheets on hollow ZnTe microspheres using lattice matching. The formed Tellurium‐Antimony (Te─Sb) bonds improved poor contact at heterojunction interface, effectively promoted charge separation, and successfully suppressed photocorrosion. unique core‐shell not only strengthens light absorption but also improves adsorption capacity. Consequently, S‐scheme synergistic effect chemical significantly enhances performance. photocatalyst offers a selectivity 90.5%, which higher than that pure (22.9%) (56.9%). This holds great promise practical applications reduction.

Language: Английский

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Highly Selective CO₂ Conversion to CH₄ by a N-Doped HTiNbO₅/NH₂-UiO-66 Photocatalyst without a Sacrificial Electron Donor

JACS Au, Journal Year: 2024, Volume and Issue: 5(3), P. 1184 - 1195

Published: Dec. 19, 2024

Photocatalytic reduction of CO2 to value-added chemicals is a promising technology for reducing atmospheric CO2, but selectively producing specific product still remains great challenge. In this study, Z-scheme heterojunction, N-doped HTiNbO5/NH2-UiO-66(Zr) (referred as NH-NU), developed integrate the advantages semiconductor photocatalysts and porous adsorbents CO2-to-CH4 conversion. The NH-NU heterojunctions are fabricated via simple one-pot solvothermal method, enabling formation tight uniform interface between two phases, thereby facilitating separation transfer photoinduced charge carriers, confirmed by TEM, EPR, electrochemical studies, work functions. As result, as-prepared photocatalyst demonstrates significant increase in selectivity CH4 production through photoreduction, achieving 10-fold enhancement compared that pristine MOF, NH2-UiO-66. Moreover, there no obvious decrease photocatalytic activity across four consecutive cycles. situ FT-IR spectroscopy DFT calculations reveal charge-enriched NH-NU-3 composites stabilize various C1 intermediates multistep elementary reactions, leading superior conversion process. This establishes efficient selective heterogeneous catalytic processes can be achieved stabilization reaction designing suitable heterojunctions.

Language: Английский

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Rational Design of Janus Metal Atomic‐Site Catalysts for Efficient Polysulfide Conversion and Alkali Metal Deposition: Advances and Prospects

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)

Published: Feb. 1, 2024

Abstract Although metal–sulfur batteries (M–S batteries, M = Li, Na, K) are promising next‐generation energy‐storage devices because of ultrahigh theoretical energy density, low cost, and environmentally friendliness, their practical applications significantly hindered by the shuttle effect polysulfides growth alkali metal dendrites. These issues can be mitigated using Janus atomic‐site catalysts, which possess maximum atom utilization efficiency (≈100%), adjustable electronic structures, tailorable catalytic sites, thereby effectively improving electrochemical performance M–S batteries. In this review, recent progress development atomic‐sites on properties, synthesis, characterizations reviewed. Then, advances in catalysts intended for accelerating polysulfide conversion regulating deposition, briefly introducing working principles systematically summarized. Furthermore, a high emphasis is placed effective regulation strategies rational design Finally, current challenges future research directions also presented to develop high‐efficiency high‐energy

Language: Английский

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The multiple roles of rare earth elements in the field of photocatalysis

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 11(1), P. 11 - 28

Published: Nov. 20, 2023

The role and classification of rare earth elements in photocatalysts are summarized, with the aim providing suggestions for future development photocatalysts.

Language: Английский

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Microenvironment Modulation of Ultrathin Bronze‐Phase TiO₂ Nanosheets for Highly Selective Photocatalytic CO₂ Reduction in Water

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(9)

Published: Nov. 21, 2023

Abstract Photocatalytic reduction of CO 2 with H O provides a promising and sustainable pathway to produce valuable chemicals fuels. However, the low efficiency concomitant competition evolution pose serious challenges practical applications. Herein, novel approach is proposed modulate surface microenvironment photocatalysts by utilizing hydrogen peroxide (H ). A bronze‐phase TiO (TB) composed ultrathin nanosheet thickness ∼3 nm fabricated employed as model catalyst for photocatalytic reduction. molecules are presumed be bonded TB form TB‐H (TBHO) active specie. The newly generated TBHO enhances adsorption accelerates mass transfer, weakly acidic serves purpose mediating proton‐coupled electron transfer path. Consequently, nanosheets assisted show an excellent generation rate 29.1 µmol −1 g h (which 11.2‐fold higher than that pure TB) in water, selectivity toward nearly 100%. This work underscores importance tailoring promote while minimizing water.

Language: Английский

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Efficient photocatalytic NO oxidation over novel NiAl layered double hydroxide/Bi₄Ti₃O₁₂ Z-scheme heterojunctions with boosted charge separation and O₂ activation

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(25), P. 13640 - 13652

Published: Jan. 1, 2023

The novel NiAl-LDH/Bi 4 Ti 3 O 12 Z-scheme heterojunction exhibits excellent NO oxidation performance with low toxic 2 generation. enhanced activity can be attributed to the boosted charge separation and optimized oxygen activation capability.

Language: Английский

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Study on synergistic effects of 4f levels of erbium and black phosphorus/SnNb₂O₆ heterostructure catalysts by multiple spectroscopic analysis techniques

Chemical Science, Journal Year: 2024, Volume and Issue: 15(5), P. 1860 - 1869

Published: Jan. 1, 2024

Lanthanide single atom modified catalysts are rarely reported because the roles of lanthanide in photocatalysis difficult to explain clearly. Based on construction Er black phosphorus/SnNb

Language: Английский

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Recent Advances in Graphene-Based Single-Atom Photocatalysts for CO2 Reduction and H2 Production

Catalysts, Journal Year: 2024, Volume and Issue: 14(6), P. 343 - 343

Published: May 24, 2024

The extensive use of single-atom catalysts (SACs) has appeared as a significant area investigation in contemporary study. catalyst, characterized by its maximum atomic proficiency and great discernment the transition-metal center, unique combination benefits from both heterogeneous homogeneous catalysts. Consequently, it effectively bridges gap between these two types catalysts, leveraging their distinctive features. utilization SACs immobilized on graphene substrates garnered considerable interest, primarily because capacity to facilitate selective efficient photocatalytic processes. This review aims comprehensively summarize progress potential uses made carbon dioxide (CO2) reduction hydrogen (H2) generation. focus is contribution converting solar energy into chemical energy. present study represents various preparation methods characterization approaches graphene-based photocatalyst investigates detailed mechanisms underlying processes discusses recent studies that have demonstrated remarkable H2 production rates through photocatalysts. Additionally, pivotal roleof theoretical simulations, likedensity functional theory (DFT), understand structural relationships are discussed. revolutionize solar-to-chemical conversion CO2 underscored, along with addressing challenges outlining future directions for this developing By shedding light contributes collective pursuit sustainable strategies mitigate global climate crisis.

Language: Английский

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