2D/2D Bi-MOF-derived BiOCl/MoS2 nanosheets S-scheme heterojunction for effective photocatalytic degradation

Liu, Mengchi; Ye, Peng; Men, Wang; Wang, Lele; Wu, Chao; Xu, Jing; Chen, Yuanping

doi:10.1016/j.jece.2022.108436

Cited by 26 publications

(17 citation statements)

References 47 publications

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“…The correlation between the carrier separation efficiency and signal peak intensity reveals that the lower the peak intensity, the higher the efficiency . In Figure b, the strongest characteristic peak is observed for the PRT sample, implying that it possesses the weakest charge separation efficiency . The random distribution of dual cocatalysts on the outer TiO 2 layer could lead to a decrease in the electron–hole separation efficiency.…”

Section: Resultsmentioning

confidence: 96%

“…39 In Figure 5b, the strongest characteristic peak is observed for the PRT sample, implying that it possesses the weakest charge separation efficiency. 40 The random distribution of dual cocatalysts on the outer TiO 2 layer could lead to a decrease in the electron−hole separation efficiency. The characteristic peaks observed for the PTR and RTP samples are weaker than those detected for the PRT sample, indicating that the dual cocatalysts with spatial separation have a significant positive impact on the improvement of the carrier separation efficiency.…”

Section: Structure and Morphologymentioning

confidence: 99%

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Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Li,

Zhu,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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The reaction efficiency of TiO 2 -based photocatalysts can be improved through the effective utilization of light and separation of carriers, which can be achieved via material structure designing. Herein, the synthesis of a novel hollow flowerlike TiO 2 -based nanomaterial by regulating the positions of dual cocatalysts on a Janus surface is reported. The dual cocatalysts (RuO 2 and Pt NPs) with redox capability were selectively deposited on different surfaces (constructed Janus surface) of TiO 2 materials to achieve directional transfer and spatial separation of photogenerated charges. Furthermore, the presence of dual cocatalysts may reduce the activation energy necessary for the reaction, enable the catalytic reaction to progress in a favorable direction, and increase the catalyst capability. Additionally, hollow nanostructures significantly shorten the migration distance of photogenerated carriers, owing to their thin-shell structure, further improving the separation of electron−hole pairs and migration efficiency. The results indicate that the deposition positions of the dual cocatalysts significantly affect the H 2 -evolution rate. Further studies reveal that macromolecule OH − exhibits a lower probability of entering the inner surface of the catalyst to participate in the reaction, whereas micromolecule H + demonstrates a higher probability of entering the inner surface of the catalyst, leading to differences in catalyst activity. Among the analyzed samples, PTR demonstrates the most notable H 2 -evolution rate, reaching 4,024 μmol g −1 h −1 , which is higher than those of pure TiO 2 and RTP by 60.96-and 1.22-fold, respectively. Furthermore, the mechanism of the charge migration pathway was analyzed via ultraviolet photoelectron spectroscopy, Mott−Schottky plots, and ultraviolet− visible diffusive reflectance spectroscopy. Catalyst activity increased substantially under illumination owing to the synergy between the special hollow Janus structure and the spatially separated dual cocatalysts.

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Section: Resultsmentioning

confidence: 96%

Section: Structure and Morphologymentioning

confidence: 99%

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Li,

Zhu,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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“…A significantly increased surface voltage was detected for the WCC/CdS catalyst, indicating enhanced high charge transfer efficiency (Figure 6c). 57 As shown in Figure 6d, the photocurrent density of WCC/CdS is much higher than that of pristine CdS, which is caused by the greatly promoted charge separation in WCC/CdS. 58 As for the electrochemical impedance spectroscopy (EIS) curves, WCC/ CdS has a smaller impedance semicircle than CdS, manifesting a lower charge transfer resistance that results in a more efficient transfer rate of charge carriers in the former (Figure 6e).…”

Section: Resultsmentioning

confidence: 98%

Optimizing Electronic Density at Active W Sites for Boosting Photocatalytic H₂ Evolution

Xu,

Zhang,

Yan

et al. 2024

Inorg. Chem.

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It is highly desirable but challenging to optimize the electronic structure of an active site to realize moderate active site-H ads bond energies for boosting photocatalytic H 2 evolution. Herein, an interfacial engineering strategy is developed to simultaneously concentrate hydrogen species and accelerate the combination of an H ads intermediate to generate free H 2 by constructing W−WC− W 2 C (WCC) cocatalysts. Systematic investigations reveal that hybridizing with W 2 C creates electron-rich W active sites and effectively induces the downshift of the dband center of W in WC. Consequently, the strong W−H ads bonds on the surface of WC are weakened, thus promoting the desorption of H ads to rapidly produce free H 2 . The optimized 40-WCC/CdS photocatalyst exhibits a high hydrogen evolution rate of 63.6 mmol g −1 h −1 under visible light (≥420 nm) with an apparent quantum efficiency of 39.5% at 425 nm monochromatic light, which is about 40-fold of the pristine CdS. This work offers insights into the design of cocatalyst for highefficiency photocatalytic H 2 production.

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“…The results showed that the photocatalytic performance of the CeO2/TiO2 heterojunction can be significantly improved, and the ratio of Ce/Ti and solvothermal time affect the photocatalytic performance of the heterojunction. The 2H-MOS2 has semiconductor characteristics, adjustable band structure, and high electron transfer capability, which can be used as a catalyst and cocatalyst [14,15]. Jiao et al [16] used butyl titanate as the titanium source and MoS2 as a supporting agent to prepare TiO2/MoS2 composite photocatalyst by sol-gel method and hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Photocatalytic Properties of TiO₂/MoS₂ Composites

Yang

Wang²,

Yang³

et al. 2023

J. Phys.: Conf. Ser.

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The use of semiconductor photocatalysts to degrade organic pollutants and convert them into useful chemical energy is a promising technology to solve environmental problems. MoS2 and TiO2 have matching band structures. In this work, detailed characterization showed that TiO2/MoS2 complexes were synthesized by the hydrothermal method. It effectively increases the separation rate of photogenerated electron-hole pairs. In this paper, the photocatalytic degradation of rhodamine B (Rh B) by TiO2/MoS2 composites with different proportions under visible light was studied. The results showed that the Mo/Ti ratio would affect the photocatalytic activity. The composite had the best catalytic performance when the Mo/Ti ratio was 2:1. Compared with the intrinsic TiO2, its degradation rate increased by 60.28%.

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2D/2D Bi-MOF-derived BiOCl/MoS2 nanosheets S-scheme heterojunction for effective photocatalytic degradation

Cited by 26 publications

References 47 publications

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Optimizing Electronic Density at Active W Sites for Boosting Photocatalytic H₂ Evolution

Preparation and Photocatalytic Properties of TiO₂/MoS₂ Composites

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2D/2D Bi-MOF-derived BiOCl/MoS2 nanosheets S-scheme heterojunction for effective photocatalytic degradation

Cited by 26 publications

References 47 publications

Janus Flower-Like Hollow TiO2 Photocatalysts Bearing RuO2 and Pt Nanoparticles for Solar-Light-Driven Catalytic H2 Evolution

Janus Flower-Like Hollow TiO2 Photocatalysts Bearing RuO2 and Pt Nanoparticles for Solar-Light-Driven Catalytic H2 Evolution

Optimizing Electronic Density at Active W Sites for Boosting Photocatalytic H2 Evolution

Preparation and Photocatalytic Properties of TiO2/MoS2 Composites

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Product

Resources

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Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Janus Flower-Like Hollow TiO₂ Photocatalysts Bearing RuO₂ and Pt Nanoparticles for Solar-Light-Driven Catalytic H₂ Evolution

Optimizing Electronic Density at Active W Sites for Boosting Photocatalytic H₂ Evolution

Preparation and Photocatalytic Properties of TiO₂/MoS₂ Composites