Photodeposition of CoO  and MoS2 on CdS as dual cocatalysts for photocatalytic H2 production

Di, Tingmin; Deng, Quanrong; Wang, Geming; Wang, Shenggao; Wang, Linxi; Ma, Yuhua

doi:10.1016/j.jmst.2021.12.071

Cited by 62 publications

(14 citation statements)

References 59 publications

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“…According to the intersection point of linear portions of the Mott–Schottky curves (different testing frequencies) on the horizontal axis, CdS nanoparticles display a flat-band potential of −0.43 V versus reversible hydrogen electrode (RHE) (Figure a). Moreover, the Mott–Schottky curves present positive slopes, revealing the n-type semiconductor characteristic of CdS nanoparticles . Consequently, the conduction-band potential is calculated as −0.53 V versus RHE for CdS, considering that the conduction-band potential of an n-type semiconductor is 0.1 V more negative than its corresponding flat-band potential .…”

Section: Resultsmentioning

confidence: 99%

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Wang²,

Wang

et al. 2023

ACS Appl. Nano Mater.

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Photocatalytic water splitting using semiconductor-based catalysts is a promising avenue to gain H2 fuel from renewable solar energy. Nonetheless, developing earth-abundant and visible-light-responsive photocatalysts for efficient H2 production still remains a huge challenge. In this work, unique two-dimensional hierarchitectures of S-deficient CdS integrated with ultrafine CoP nanocrystals embedding in graphitic N-doped C (CoP-CN) nanosheets are fabricated for the first time. Noticeably, the graphitic CN electron mediator not only enhances the photocatalytic stability of CdS/CoP-CN composites by protecting CoP from external corrosion but also induces the formation of an ohmic junction to boost electron extraction from CdS to CoP efficiently. Meanwhile, the S vacancies in CdS serve as electron traps to further enhance the separation of photogenerated carriers. Such unique CdS/CoP-CN hierarchical hybrid nanosheets exhibited an extraordinary visible-light-induced (λ > 400 nm) photocatalytic H2-evolving performance, delivering a high apparent quantum yield (26.3% at 420 nm) and an excellent H2 generation rate of 54.01 mmol·g–1·h–1, much superior to those of a CdS/CoP Schottky junction, Pt-loaded CdS, and a vast amount of CdS-based photocatalysts ever reported. In addition, the outstanding H2-evolving durability of CdS/CoP-CN composites was verified by cycling and long-term photocatalytic tests. The findings presented here are anticipated to enlighten the rational design and synthesis of highly active photocatalysts with an ohmic junction for application in energy and environment-related domains.

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Section: Resultsmentioning

confidence: 99%

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Wang²,

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…13 To solve such problems, coupling cocatalysts is favored for its simple operation, effective improvement of charge separation, and light absorption. 14 Transition metal nitrides (TMNs) are a class of intermetallic compounds formed by inserting N atoms into the lattice of the transition metal, which illustrate excellent electrical conductivity and electrocatalytic activity. 15 The high conductivity of the TMNs gives them the ability to become a high-efficiency cocatalyst in photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

“…Among available semiconductors, chalcogenide compounds (CdS, CdZnS, and ZnIn 2 S 4 ) have been reported to demonstrate wide abilities for organic transformations, H 2 production, sterilization, and pollution degradation. − However, the photocatalytic performance of a single chalcogenide compound is unsatisfactory due to insufficient light absorption, low charge separation, and sluggish surface reaction kinetics . To solve such problems, coupling cocatalysts is favored for its simple operation, effective improvement of charge separation, and light absorption . Transition metal nitrides (TMNs) are a class of intermetallic compounds formed by inserting N atoms into the lattice of the transition metal, which illustrate excellent electrical conductivity and electrocatalytic activity .…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

Cheng

et al. 2022

Inorg. Chem.

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Charge separation and transfer are the dominating factors in achieving high activity of solar energy-based photocatalysis. Here, a plasmonic transition metal nitride, Ni 3 N, nanosheet was fabricated and employed as an efficient cocatalyst to couple with Cd 0.9 Zn 0.1 S (CZS) solid solution via a self-assembly method to form a novel Ni 3 N/CZS heterojunction with an intimate interface. On one hand, localized surface plasmon resonance of the Ni 3 N nanosheets endowed the fabricated Ni 3 N/CZS composite with a wide-spectrum light absorption capacity, even to the nearinfrared range. On the other hand, Ni 3 N as a cocatalyst can not only effectively induce the directional electron transfer from CZS to Ni 3 N active sites but also enhance the surface charge separation efficiency of the Ni 3 N/CZS heterojunction by 4.1 times compared to that of pure CZS. Plasmonic Ni 3 N also provided a photothermal effect to enhance the surface temperature of the composite for boosting the catalytic reaction kinetics. As a result, under visible light irradiation, the optimal Ni 3 N/CZS composite exhibited simultaneous H 2 generation and benzaldehyde formation rates of 35.08 and 16.44 mmol g −1 h −1 , which were 9.4 and 5.9 times those of CZS, respectively; and the composite also demonstrated a strong antibacterial ability with a sterilization rate of 99.7% toward Escherichia coli. Besides that, under NIR light, plasmonic Ni 3 N offered extra hot electrons that can transfer back to CZS to take part in the photocatalytic reaction, leading to the Ni 3 N/CZS composite still having a high H 2 production of 179.6 μmol g −1 h −1 . This work focuses on developing and applying novel plasmonic cocatalysts in photocatalysis for achieving adjustable electron transfer and fast charge separation for extensive practical application.

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“…4–8 The key targets in this field are highly dependent on the delicate design of highly efficient photocatalysts, marking good activity and stability, for solar-driven H 2 production. 9–11 An ideal visible-light-responsive photocatalytic material of cadmium sulfide (CdS), possesses the merits of a suitable band gap and conduction band alignment, affording sufficient photo-carries with high carrier mobilities, for facilitating surface proton reduction in photocatalytic H 2 production. Unfortunately, CdS itself still suffers from high recombination of charge carriers, inadequate surface-active sites, and severe photo-corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, CdS itself still suffers from high recombination of charge carriers, inadequate surface-active sites, and severe photo-corrosion. 11–16 Such unfavorable factors restrain its practical photocatalytic performance in commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

Wei¹,

Li²,

Ma³

et al. 2022

Sustainable Energy Fuels

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Photodeposition of CoO and MoS2 on CdS as dual cocatalysts for photocatalytic H2 production

Cited by 62 publications

References 59 publications

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

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Photodeposition of CoO and MoS2 on CdS as dual cocatalysts for photocatalytic H2 production

Cited by 62 publications

References 59 publications

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H2 Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H2 Evolution

Plasmonic Ni3N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation

Self-assembly induction of reduced graphene oxide decorated CdS nanoboxes for photocatalytic hydrogen evolution

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CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

CoP-Embedded Graphitic N-Doped C Nanosheets in Ohmic Contact with S-Deficient CdS Nanocrystals Triggering Efficient Visible-Light Photocatalytic H₂ Evolution

Plasmonic Ni₃N Cocatalyst Boosting Directional Charge Transfer and Separation toward Synergistic Photocatalytic–Photothermal Performance of Hydrogen and Benzaldehyde Production as Well as Bacterial Inactivation