Zn0.1Cd0.9S/NiS heterojunction photocatalysts for enhanced H2 production and glucose conversion

Shen, Yuan-Sheng; Bai, Fang-Yuan; Wei, Ke; Wang, Xinling; Jiang, Zeyu; Liu, Jing; Hu, Zhi‐Yi; Chen, Lihua; Liu, Yu; Su, Bao‐Lian

doi:10.1016/j.apsusc.2023.157237

Cited by 13 publications

(3 citation statements)

References 57 publications

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“…The positive slope values of the Mott− Schottky plots at 500 frequency show that pure P25 and R-CQD/P25−2.5 samples are n-type semiconductors. 56 The slightly reduced slope value for R-CQD/P25−2.5 indicates the improved donor density compared to that of pure P25, which is ascribed to the improved charge separation after R-CQD decoration. High donor density, perhaps due to red-emission carbon quantum dots, helps to improve the photocatalytic performance by increasing the electrical conductivity and charge carrier mobility.…”

Section: Resultsmentioning

confidence: 99%

“…The positive slope value of pure R-CQDs is more reduced than that for both pure P25 and R-CQD/P25–2.5. The positive slope values of the Mott–Schottky plots at 500 frequency show that pure P25 and R-CQD/P25–2.5 samples are n-type semiconductors . The slightly reduced slope value for R-CQD/P25–2.5 indicates the improved donor density compared to that of pure P25, which is ascribed to the improved charge separation after R-CQD decoration.…”

Section: Resultsmentioning

confidence: 99%

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Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

Khojiev,

Hojiyeva,

Tursunkulov

et al. 2023

ACS Appl. Nano Mater.

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Carbon quantum dot (CQD) decorated semiconductor materials have become promising photocatalysts in photocatalysis, with a chance to solve energy and environmental crises. Red emissive carbon quantum dots (R-CQDs) have excellent photoluminescence (PL), upconversion, narrowed band structure, electron-accepting, and transmission properties compared to other colors emitting CQDs. In this work, we use the as-synthesized R-CQDs to decorate P25 (R-CQDs/P25) for highly enhanced visible-light photocatalysis. The results show that the photocatalytic performance of the R-CQDs/P25 composites is considerably enhanced with the increasing amount of R-CQDs in the visible-light region. The red emissive upconversion R-CQDs play dual roles as a cocatalyst to separate the photogenerated carriers and an upconversion converter from lower energetic photons to high energetic photons. Various measurements reveal that the R-CQD/P25 photocatalysts have a narrowed band gap, improved charge transfer efficiency, and lower recombination rate, synergistically endowing the R-CQDs/P25 composites with excellent photocatalytic performance. The R-CQD/P25−2.5 composite exhibits the highest photocatalytic activity, which is ∼10 times higher for hydrogen evolution and ∼20 times higher for the photodegradation of methylene blue (MB) compared to pure P25, and its apparent quantum yield (AQY) is 4.94% under 450 nm monochromatic light. This work opens the door for rational design of different fluorescence CQDs and their potential application for solar hydrogen production in a low-cost noble-metal-free system.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

Khojiev,

Hojiyeva,

Tursunkulov

et al. 2023

ACS Appl. Nano Mater.

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“…The flat band potentials of these two materials with Ag/AgCl as the reference electrode are calculated to be −0.7 V and −0.74 V, respectively. Then, after converting it through a standard hydrogen electrode, 47 the Fermi energy levels are −0.09 eV and −0.13 eV, respectively. From the valence band (VB) spectrum (Fig.…”

Section: Resultsmentioning

confidence: 99%

CdS QDs grown on ellipsoidal BiVO₄ for efficient photocatalytic degradation of tetracycline

Liu,

Ran,

et al. 2024

Dalton Trans.

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Roles of Cocatalysts in Biomass Photo(electro)refining

Li,

Wang

et al. 2024

Advanced Energy Materials

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Photosynthesis converts solar energy, carbon dioxide, and water into biomass, offering a renewable energy and chemical source. Biomass photo(electro)refining (BPeR) emerges as a sustainable alternative to petrochemicals for fuel and chemical production. However, BPeR faces challenges due to photocatalyst limitations, necessitating the integration of cocatalysts. Cocatalysts significantly impact the efficiency, selectivity, and durability of BPeR reactions, yet their roles require systematic elucidation and understanding. This review explores how cocatalysts impact the carbon bond functionalization, cleavage, and formation in biomass and its derivatives. It discusses their crucial roles in charge carrier generation, separation, and transportation, particularly in catalyzing surface reactions such as hydrogen‐involved reactions, generation, and manipulation of oxygen or carbon radicals, and the C─C/O/H bond transformations. Additionally, it outlines challenges and prospects for developing cocatalysts to enhance BPeR efficiency and durability, boosting the viability of biomass as a sustainable source of energy and materials.

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Zn0.1Cd0.9S/NiS heterojunction photocatalysts for enhanced H2 production and glucose conversion

Cited by 13 publications

References 57 publications

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

CdS QDs grown on ellipsoidal BiVO₄ for efficient photocatalytic degradation of tetracycline

Roles of Cocatalysts in Biomass Photo(electro)refining

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Zn0.1Cd0.9S/NiS heterojunction photocatalysts for enhanced H2 production and glucose conversion

Cited by 13 publications

References 57 publications

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO2 for Enhanced Photocatalytic Performance

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO2 for Enhanced Photocatalytic Performance

CdS QDs grown on ellipsoidal BiVO4 for efficient photocatalytic degradation of tetracycline

Roles of Cocatalysts in Biomass Photo(electro)refining

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Product

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Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

Red Emissive Upconversion Carbon Quantum Dots Modifying TiO₂ for Enhanced Photocatalytic Performance

CdS QDs grown on ellipsoidal BiVO₄ for efficient photocatalytic degradation of tetracycline