Investigation of the local photothermal effects by fabricating a CQDs/Au/TiO<sub>2</sub> photoelectrode in a PEC water splitting system

Cao, Angran; Sang, Lixia; Yu, Zebin; Zhao, Yüe; Wang, Xudong; Wang, Chong; Ma, Mengdong

doi:10.1039/d1cy02113c

Cited by 16 publications

(4 citation statements)

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“…Due to its high charge separation efficiency, the R -CQD/P25–2.5 display the lowest charge-transfer resistance. The lower charge-transfer resistance is a major reason for the higher charge separation efficiency and photoelectron performance. ,− Based on photocurrent and EIS results, it is then concluded that the R-CQD/P25–2.5 demonstrates a significantly enhanced separation and transfer efficiency of photogenerated carriers among these samples.…”

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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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%

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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“…Zhang et al prepare a snowflake Cu 2 S/MoS 2 /Pt material by a hydrothermal method and electrodeposition [133] . Under infrared induction, the photothermal effect of MoS 2 can generate a larger photocurrent by increasing the electron transfer speed and interface electrochemical reaction, and the LSPR effect of Pt NPs further stabilizes the photothermal properties of the material.…”

Section: Other Photothermal Materialsmentioning

confidence: 99%

Photothermal effect and application of photothermal materials in photocatalysis and photoelectric catalysis

Zhang,

Tang,

Yang

et al. 2024

Microstructures

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Photocatalysis (PC) and photoelectric catalysis (PEC) are environmental protection technologies that use sunlight capacity and environmental governance, and they have a wide range of applications in hydrogen production, carbon dioxide reduction, organic degradation, and other fields. When the light is irradiated on the material, part of the light energy will be converted into heat energy, and the combination of this part of the heat energy with PC and PEC will become an important way to improve optical performance. Compared with traditional technology, the synergistic effect of light and heat can obtain higher catalytic performance and improve energy utilization efficiency. This review begins with an overview of the principle of photoheat generation, which produces heat energy in a non-radiative process through photo-induced instability of electrons. The principle of thermal effect on the performance improvement of PC/PEC is analyzed from the dynamics and thermodynamics of photoreaction and electric reaction. On this basis, several materials widely used at present are listed, such as oxides, plasmas, conductive polymers, carbon materials, and other typical photothermal materials. The specific applications of photothermal materials in PC and PEC processes, such as hydrogen production by oxidation, carbon dioxide reduction, organic matter reduction, and seawater desalination, were discussed. Finally, the challenges to PC/PEC from the introduction of thermal effects are further discussed to provide a clean and sustainable way to build a carbon-neutral society.

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“…The PL emission pattern is similar to the Stokes type emission pattern in that the PL emission wavelength is longer than the excitation wavelength of the laser. Many publications have been published on the observation of PL emissions in CQDs from diverse sources ( Cao et al, 2022 ; Liang et al, 2022 ; Pooresmaeil et al, 2022 ; Yu et al, 2022 ; Zhang et al, 2022 ). A detailed look at the spectroscopic aspects of the emissions and the underlying structural characteristics reveals that most recorded PL emissions fall into one of two groups.…”

Section: Properties Of Cqdsmentioning

confidence: 99%

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Jung

Sapner

Adhikari³

et al. 2022

Front. Chem.

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Investigation of the local photothermal effects by fabricating a CQDs/Au/TiO₂ photoelectrode in a PEC water splitting system

Abstract: The high efficiency of photoanode material is great significant for photoelectrochemical (PEC) water splitting. Herein, CQDs/Au/TiO2 nanorods array composite photoanode was constructed with special attention to local photothermal effects. The...

Cited by 16 publications

References 50 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

Photothermal effect and application of photothermal materials in photocatalysis and photoelectric catalysis

Recent Progress on Carbon Quantum Dots Based Photocatalysis

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Investigation of the local photothermal effects by fabricating a CQDs/Au/TiO2 photoelectrode in a PEC water splitting system

Abstract: The high efficiency of photoanode material is great significant for photoelectrochemical (PEC) water splitting. Herein, CQDs/Au/TiO2 nanorods array composite photoanode was constructed with special attention to local photothermal effects. The...

Cited by 16 publications

References 50 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

Photothermal effect and application of photothermal materials in photocatalysis and photoelectric catalysis

Recent Progress on Carbon Quantum Dots Based Photocatalysis

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Product

Resources

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Investigation of the local photothermal effects by fabricating a CQDs/Au/TiO₂ photoelectrode in a PEC water splitting system

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

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