Construction of two-dimensionally relative p-n heterojunction for efficient photocatalytic redox reactions under visible light

Wu, Huihui; Meng, Sugang; Zhang, Jinfeng; Zheng, Xiuzhen; Wang, YaXiao; Chen, Shifu; Qi, Guoqing; Fu, Xianliang

doi:10.1016/j.apsusc.2019.144638

Cited by 44 publications

(23 citation statements)

References 66 publications

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“…33 In the previous reports, NiS is a p-type semiconductor, 34,35 while some other materials (e.g., CdS and g-C 3 N 4 ) are generally recognized as the n-type semiconductors. 36 Then, the H 2 evolution of composite photocatalysts with p−n heterostructures can be enhanced, in which the photogenerated electrons can migrate from the main catalyst to NiS. Thus, NiS as the cocatalyst can effectively replace metal catalyst to low reaction activation energy or overpotential for hydrogen production, act as active sites, inhibit photocorrosion, and enhance stability.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

Yang

Meng

Jiang

et al. 2020

ACS Appl. Energy Mater.

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Construction of heterojunctions between semiconductors is a significant way to promote the photocatalytic performance by improving the photogenerated charge separation. Herein, CdS with multistage structures (sphere, flower, and wheat) were first synthesized, and their photocatalytic activities of hydrogen production were not too high as massive electrons and holes are rapidly recombined. NiS/CdS composites were then prepared by depositing NiS nanofragments on the CdS surface, which exhibited higher photocatalytic activity (about 13-fold) than pure CdS. The enhanced reason is the effective charge separation and transfer (Z-scheme charge migration) formed between p-type NiS and n-type CdS, which is confirmed by Mott− Schottky plots and density of states. Moreover, the NiS/CdS composite shows much more efficient charge transfer than pure CdS, indicated by photocurrent response and photoluminescence. Therefore, this study offers an important strategy for the design of multistage structural photocatalysts with a p−n heterojunction to improve the charge separation.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

Yang

Meng

Jiang

et al. 2020

ACS Appl. Energy Mater.

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“…Employing photocatalyst to accomplish organic oxidation is an attractive strategy. g-C 3 N 4based 2D/2D heterojunction has been applied to oxidize organic molecule such as benzylamine, [135] 5-hydroxymethylfurfural, [136] ethanol, [137] methanol and formic acid. [138] Sun et al synthesized a Si-O-bridged 2D/2D g-C 3 N 4 /WO 3 heterojunction photocatalyst applied in benzyl alcohol (BA) oxidation.…”

Section: Organic Oxidationmentioning

confidence: 99%

g‐C₃N₄‐Based 2D/2D Composite Heterojunction Photocatalyst

et al. 2021

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“…6e). This is because MoS 2 forms a p-n junction with CdS, which lengthens the lifetime of the charge [56,57]. Under visible light irradiation, the Zscheme CdS@MoS 2 catalyst produced electron-hole pairs.…”

Section: Science China Materialsmentioning

confidence: 99%

“…In addition, when p-type MoS 2 was incorporated into n-type CdS, the electrons were transferred from the higher Fermi level to the lower Fermi level until the two Fermi levels reached the same Fermi level. As the Fermi level tends to be consistent [57,64], the internal electric fields of p-type negative charge (MoS 2 ) and n-type positive charge (CdS) are formed, which is due to the accumulation and loss of electrons, respectively. This causes in the band to bend downward and upward.…”

Section: Science China Materialsmentioning

confidence: 99%

“…Interestingly, downward bending MoS 2 and upward bending CdS provide a smooth channel for charge transport, allowing the electrons in the MoS 2 CB and the holes in the CdS VB to easily recombine [57]. In general, if the direction of the internal electric field is opposite to the direction of electron transfer, it is consistent with the band-band transfer mechanism; otherwise, it is a Z-scheme transfer [36,57,61]. Obviously, the direction of the electric field of the CdS@MoS 2 system is directed from the n-type CdS with positive charge to the p-type MoS 2 with negative charge, and is consistent with the electron transfer direction.…”

Section: Science China Materialsmentioning

confidence: 99%

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Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Zhao

Yan

et al. 2020

Sci. China Mater.

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Photocatalytic hydrogen production coupled with selective oxidation of organic substrates to produce highvalue-added fine chemicals has drawn increasing attention. Herein, we report a noble metal-free photocatalyst for the highly efficient and simultaneous generation of hydrogen and the selective oxidation of benzyl alcohol into benzaldehyde over CdS@MoS 2 heterostructures under visible light. Without the need for a sacrificial agent, CdS@MoS 2 displayed an excellent hydrogen production rate of 4233 μmol g −1 h −1 with 0.3 mmol benzyl alcohol, which is approximately 53 times higher than that of bare CdS nanorods (80 μmol g −1 h −1). The reaction system was highly selective for the oxidation of benzyl alcohol into benzaldehyde. When the amount of benzyl alcohol increased to 1.0 mmol, the hydrogen production reached 9033 μmol g −1 h −1. Scanning electron microscopy and transmission electron microscopy images revealed that p-type MoS 2 sheets with a flower-like structure closely adhered to n-type semiconductor CdS nanorods through the formation of a p-n heterojunction. As a potential Z-scheme photocatalyst, the CdS@MoS 2 heterostructure effectively produces and separates electron-hole pairs under visible light. Thus, the electrons are used for reduction to generate hydrogen, and the holes oxidize benzyl alcohol into benzaldehyde. Moreover, a mechanism of photogenerated charge transfer and separation was proposed and verified by photoluminescence, electrochemical impedance spectroscopy, photocurrent and Mott-Schottky measurements. The results reveal that the CdS@MoS 2 heterojunctions have rapid and efficient charge separation and transfer, thereby greatly improving benzyl alcohol dehy-drogenation. This work provides insight into the rational design of high-performance Z-scheme photocatalysts and the use of holes and electrons to obtain two valuable chemicals simultaneously.

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Construction of two-dimensionally relative p-n heterojunction for efficient photocatalytic redox reactions under visible light

Cited by 44 publications

References 66 publications

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

g‐C₃N₄‐Based 2D/2D Composite Heterojunction Photocatalyst

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

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Construction of two-dimensionally relative p-n heterojunction for efficient photocatalytic redox reactions under visible light

Cited by 44 publications

References 66 publications

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

Photocatalytic Performance of NiS/CdS Composite with Multistage Structure

g‐C3N4‐Based 2D/2D Composite Heterojunction Photocatalyst

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

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Product

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About

g‐C₃N₄‐Based 2D/2D Composite Heterojunction Photocatalyst