In-suit photodeposition of MoS2 onto CdS quantum dots for efficient photocatalytic H2 evolution

Zhuge, Kaixuan; Chen, Zhoujie; Yang, Yuqi; Wang, Jin; Shi, Yangyi; Li, Zhengquan

doi:10.1016/j.apsusc.2020.148234

Cited by 71 publications

(28 citation statements)

References 47 publications

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“…Surface modification has a significant effect in tuning the optical properties of NCs [7c,13] . As shown in Figure a, the UV–vis absorption and photoluminescence (PL) spectra of CPB–BF 4 showed slight blueshift compared to that of the pristine CsPbBr 3 NCs.…”

Section: Resultsmentioning

confidence: 98%

Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction

Wang

Idris

et al. 2021

Solar RRL

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Converting CO2 into chemical fuels with sunlight is a very attractive approach to solve the greenhouse effect and fossil fuel crisis. Metal halide perovskite nanocrystals (NCs) have been identified as ideal semiconductor photocatalysts for photocatalytic CO2 reduction due to their unique properties, such as strong light absorption, low exciton binding energy, tunable bandgaps, and low cost. However, the pristine perovskite NCs suffering from inevitable defects, which lower their charge transfer efficiency and are detrimental to photocatalytic performance toward CO2 reduction. Herein, a facile approach to modify the surface defects of CsPbBr3 NC is demonstrated using tetrafluoroborate salts as defects treatment agent and loading Co2+ as a cocatalyst. As a result, the optimized Co2+ on the surface of defect‐free CsPbBr3‐BF4 shows a remarkable photocatalytic CO2 activity of 83.8 μmol g−1 h−1, which indicates that the surface modification can effectively suppress the undesired charge recombination in CsPbBr3 NC and promote its charge separation efficiency. This work provides an effective method to modify the surface defects of the CsPbBr3 NCs for high efficient photocatalytic CO2 reduction and broadens the photocatalytic applications of halide perovskites.

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Section: Resultsmentioning

confidence: 98%

Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction

Wang

Idris

et al. 2021

Solar RRL

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“…MoS 2 loading on the surface of CdS/P/MoS 2 can be viewed by HRTEM ( Figure 2 b). It can be seen from Figure 2 b that there are typical lattice fringes of the (002) plane with a width of 0.34 nm of CdS [ 48 ] in the middle of the nanorod, and the lattice fringes of the (002) plane with a width of 0.61 nm of MoS 2 [ 48 , 49 ] were attached to the outer edges of the nanorods. Element mappings ( Figure 2 c) also prove that Cd, S, P and a small amount of Mo are evenly distributed throughout the nanorods.…”

Section: Resultsmentioning

confidence: 99%

“…In view of the integral area of the peaks, and atomic sensitivity factors, the atomic percentages of Cd, S, doped P and zero valence P of CdS/P are calculated to be 44.3 at.%, 44.0 at.%, 9.6 at.% and 2.1 at.%, respectively. After MoS 2 loading, the peaks of Cd, S and P in CdS/P/MoS 2 move to the direction of high binding energy, which indicates that a heterojunction is formed between CdS/P and MoS 2 and is favorable for the charge transfer of photogenerated electrons from CdS/P to MoS 2 [ 49 ]. It is worth noting that there is no zero-valent phosphorus in CdS/P/MoS 2 after in situ photodeposition.…”

Section: Resultsmentioning

confidence: 99%

“…However, P 2p still exists at 132.5 eV, which proves the stable existence of P doping. As shown in Figure 3 d, there are two tiny peaks at 234.9 and 231.7 eV, corresponding to Mo 3d 3/2 and Mo 3d 5/2 , respectively, indicating that Mo element exists in the form of Mo 4+ [ 49 ]. Based on the integral area of the peaks, and atomic sensitivity factors, the atomic percentages of Mo, Cd, S, and P in CdS/P/MoS 2 were calculated to be 0.6 at.%, 47.1 at.%, 48.4 at.%, and 3.9 at.%, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Boosting CdS Photocatalytic Activity for Hydrogen Evolution in Formic Acid Solution by P Doping and MoS2 Photodeposition

Liu

Wang

et al. 2022

Nanomaterials

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Formic acid is an appealing hydrogen storage material. In order to rapidly produce hydrogen from formic acid under relatively mild conditions, high-efficiency and stable photocatalytic systems are of great significance to prompt hydrogen (H2) evolution from formic acid. In this paper, an efficient and stable photocatalytic system (CdS/P/MoS2) for H2 production from formic acid is successfully constructed by elemental P doping of CdS nanorods combining with in situ photodeposition of MoS2. In this system, P doping reduces the band gap of CdS for enhanced light absorption, as well as promoting the separation of photogenerated charge carriers. More importantly, MoS2 nanoparticles decorated on P-doped CdS nanorods can play as noble-metal-free cocatalysts, which increase the light adsorption, facilitate the charge transfer and effectively accelerate the hydrogen evolution reaction. Consequently, the apparent quantum efficiency (AQE) of the designed CdS/P/MoS2 is up to 6.39% at 420 nm, while the H2 evolution rate is boosted to 68.89 mmol·g−1·h−1, which is 10 times higher than that of pristine CdS. This study could provide an alternative strategy for the development of competitive CdS-based photocatalysts as well as noble-metal-free photocatalytic systems toward efficient hydrogen production.

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“…In the past few decades, scholars have devoted themselves to finding semiconductor catalytic materials with high catalytic performance, semiconductor materials have been extensively explored, such as TiO 2 5 – 7 , CdS 8 – 10 , ZnO 11 – 13 and g-C 3 N 4 14 – 16 . Among the various semiconductor catalysts that have been currently developed and researched, g-C 3 N 4 , as a non-metal semiconductor material, has attracted wide attention because of its suitable band gap, good stability, and visible light response.…”

Section: Introductionmentioning

confidence: 99%

MoS2 and Fe2O3 co-modify g-C3N4 to improve the performance of photocatalytic hydrogen production

Zhang

Wan

Zhang

et al. 2022

Sci Rep

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Photocatalytic hydrogen production as a technology to solve energy and environmental problems exhibits great prospect and the exploration of new photocatalytic materials is crucial. In this research, the ternary composite catalyst of MoS2/Fe2O3/g-C3N4 was successfully prepared by a hydrothermal method, and then a series of characterizations were conducted. The characterization results demonstrated that the composite catalyst had better photocatalytic performance and experiment results had confirmed that the MoS2/Fe2O3/g-C3N4 composite catalyst had a higher hydrogen production rate than the single-component catalyst g-C3N4, which was 7.82 mmol g−1 h−1, about 5 times higher than the catalyst g-C3N4 (1.56 mmol g−1 h−1). The improvement of its photocatalytic activity can be mainly attributed to its enhanced absorption of visible light and the increase of the specific surface area, which provided more reactive sites for the composite catalyst. The successful preparation of composite catalyst provided more channels for carrier migration and reduced the recombination of photogenerated electrons and holes. Meanwhile, the composite catalyst also showed higher stability and repeatability.

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In-suit photodeposition of MoS2 onto CdS quantum dots for efficient photocatalytic H2 evolution

Cited by 71 publications

References 47 publications

Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction

Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction

Boosting CdS Photocatalytic Activity for Hydrogen Evolution in Formic Acid Solution by P Doping and MoS2 Photodeposition

MoS2 and Fe2O3 co-modify g-C3N4 to improve the performance of photocatalytic hydrogen production

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In-suit photodeposition of MoS2 onto CdS quantum dots for efficient photocatalytic H2 evolution

Cited by 71 publications

References 47 publications

Surface Defect Engineering of CsPbBr3 Nanocrystals for High Efficient Photocatalytic CO2 Reduction

Surface Defect Engineering of CsPbBr3 Nanocrystals for High Efficient Photocatalytic CO2 Reduction

Boosting CdS Photocatalytic Activity for Hydrogen Evolution in Formic Acid Solution by P Doping and MoS2 Photodeposition

MoS2 and Fe2O3 co-modify g-C3N4 to improve the performance of photocatalytic hydrogen production

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Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction

Surface Defect Engineering of CsPbBr₃ Nanocrystals for High Efficient Photocatalytic CO₂ Reduction