CdS-pillared CoAl-layered double hydroxide nanosheets with superior photocatalytic activity

Qiu, Yanqiang; Lin, Bin; Jia, Fangcao; Chen, Yilin; Gao, Bifen; Лю, Пэйдэ

doi:10.1016/j.materresbull.2015.07.026

Cited by 40 publications

(12 citation statements)

References 28 publications

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“…The UV absorption may arise from ligand → metal charge transfer within the CoAl‐LDH layer. These absorption features translate to optical band gaps of 2.12 and 2.18 eV for CoAl‐LDH and CoAl‐LDH‐DS, respectively (Figure S11c,d, Supporting Information), consistent with literature reports . The 3 wt% CoAl‐LDH@TiO 2 nanocomposites exhibited spectra intermediate between those of their constituent components, albeit dominated by the majority titania component, featuring strong UV absorption arising from TiO 2 nanotubes/nanoparticles and a weak visible light response from the delaminated CoAl‐LDH nanosheets.…”

Section: Resultssupporting

confidence: 87%

Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Kumar

Durndell

Manayil

et al. 2017

Part & Part Syst Charact

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Photocatalytic reduction offers an attractive route for CO2 utilization as a chemical feedstock for solar fuels production but remains challenging due to the poor efficiency, instability, and/or toxicity of current catalyst systems. Delaminated CoAl‐layered double hydroxide nanosheets (LDH‐DS) combined with TiO2 nanotubes (NTs) or nanoparticles (NPs) are promising nanocomposite photocatalysts for CO2 reduction. Heterojunction formation between visible light absorbing delaminated CoAl nanosheets and UV light absorbing TiO2 nanotubes greatly enhances interfacial contact between both high aspect ratio components relative to their bulk counterparts. The resulting synergic interaction confers a significant improvement in photoinduced charge carrier separation, and concomitant aqueous phase CO2 photocatalytic reduction, in the absence of a sacrificial hole acceptor. CO productivity for a 3 wt% LDH‐DS@TiO2‐NT nanocomposite of 4.57 µmol gcat‐1 h‐1 exhibits a tenfold and fivefold increase over that obtained for individual TiO2 NT and delaminated CoAl‐LDH components respectively and is double that obtained for 3 wt% bulk‐LDH@TiO2‐NT and 3 wt% LDH‐DS@TiO2‐NP catalysts. Synthesis of delaminated LDH and metal oxide nanocomposites represents a cost‐effective strategy for aqueous phase CO2 reduction.

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Section: Resultssupporting

confidence: 87%

Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Kumar

Durndell

Manayil

et al. 2017

Part & Part Syst Charact

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“…10,28 The CNLDH composite material exhibits a blue-shift absorption edge at 441 nm, which is due to the quantum confinement effect of CN over LDH with the absorption band covering a wider visible region. 10,59 The spectral behavior of Ag 3 PO 4 indicated that it can absorb solar light corresponding to a band gap energy of 2.43 eV, which utilizes the efficiency of solar light and consequently enhances the photocatalytic activity. 38,54 In the heterostructure CNLDHAgP x nanocomposite, incorporation of Ag 3 PO 4 to the CNLDH hybrid can significantly affect their optical properties with enhanced absorption intensity covering a wider visible region.…”

Section: Results and Discussionmentioning

confidence: 99%

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

2018

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In this work, a series of heterostructure Ag@Ag 3 PO 4 /g-C 3 N 4 /NiFe layered double hydroxide (LDH) nanocomposites were prepared by a combination of an electrostatic self-assembly and in situ photoreduction method. In this method, positively charged p-type Ag 3 PO 4 was electrostatically bonded to the self-assembled negatively charged surface of the n–n-type g-C 3 N 4 /NiFe (CNLDH) LDH hybrid material with partial reduction of Ag + to metallic Ag nanoparticles (NPs) by the photogenerated electrons and available surface −OH groups of LDH under visible light irradiation. The presence of Ag 3 PO 4 as a p-type semiconductor, the surface plasmon resonance (SPR) effect of metallic Ag NPs, and oxygen vacancies as O v -type defects in NiFe LDH could greatly achieve the quasi-type-II p–n/n–n dual heterojunctions, which was revealed by the shifted conduction band and valence band potentials in Mott–Schottky (M–S) analysis. Among all the optimized heterostructures, CNLDHAgP4 could achieve the highest photocatalytic Cr(VI) reduction rate of 97% and phenol oxidation rate of 90% in 2 h. The heterostructure CNLDHAgP4 photocatalyst possesses a unique morphology consisting of cubic phases of both Ag NPs and Ag 3 PO 4 , which adhered to the thin and curvy layers of the CNLDH hybrid for smooth electronic and ionic charge transport. Furthermore, the intimate Schottky barriers formed at the interface of quasi-type-II p–n/n–n dual heterojunctions were verified by the photoluminescence, linear sweep voltammetry, M–S, electrochemical impedance study, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy studies. The SPR effect of Ag NPs and oxygen vacancies as O v -type defect in NiFe LDH can effectively accelerate the threshold of charge separation and be the main reason for the enhanced activity achieved by the as-fabricated heterostructure photocatalyst.

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“…In this response, it is desired to use 2D building blocks such as LDH to immobilize the 0D particles within the stacked layers, making full use of the material and structure functions by circumventing the problem through effective morphological design. This is accomplished through the exfoliation restacking method ( Figure a) [ 116 ] or layer‐by‐layer accumulation of CdS/LDH multilayer films. [ 117 ] In contrast to 0D‐CdS, 1D‐CdS exhibits the quantum confinement in a radial direction and carrier transportation in the axial direction, reducing the recombination rate of charge carriers.…”

Section: Modification Of Ldh Photocatalystsmentioning

confidence: 99%

Engineering Layered Double Hydroxide–Based Photocatalysts Toward Artificial Photosynthesis: State‐of‐the‐Art Progress and Prospects

Lau

Ong

2021

Solar RRL

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Layered double hydroxide (LDH) is a class of 2D nanomaterials, which endows auspicious properties for ameliorating the photocatalytic performance in the realm of solar‐to‐chemical production stemming from the chemical versatility of their host layers. However, pristine LDH suffers from slow charge‐carrier mobility, high rate of electron–hole recombination as well as a tendency to agglomerate, rendering them unbefitting for practical use. Due to the aforementioned bottlenecks, structural modifications such as thickness tuning, cocatalyst incorporation, semiconductor coupling, and ternary heterostructure engineering have been extensively investigated to elucidate a new lease of landscape to the burgeoning potential of LDHs toward artificial photosynthesis. This review summarizes a panorama of state‐of‐the‐art advancements related to the synthesis and modification of LDH‐based nanocomposites for enhanced physicochemical properties toward boosted photocatalysis. Particularly, their progress in versatile energy applications in photocatalytic water splitting (hydrogen and oxygen evolution), and nitrogen and carbon dioxide reduction reactions will be systematically presented. Insights into band structures, electronic properties, and charge‐carrier dynamics of LDH‐based nanostructures will be discussed to unravel the structure–performance relationship. Finally, this review will prospect the invigorating prospectives and opportunities in engineering next‐generation LDH‐based photocatalysts with augmented performances to pave new inroads at the forefront of this research.

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CdS-pillared CoAl-layered double hydroxide nanosheets with superior photocatalytic activity

Cited by 40 publications

References 28 publications

Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

Engineering Layered Double Hydroxide–Based Photocatalysts Toward Artificial Photosynthesis: State‐of‐the‐Art Progress and Prospects

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CdS-pillared CoAl-layered double hydroxide nanosheets with superior photocatalytic activity

Cited by 40 publications

References 28 publications

Delaminated CoAl‐Layered Double Hydroxide@TiO2 Heterojunction Nanocomposites for Photocatalytic Reduction of CO2

Delaminated CoAl‐Layered Double Hydroxide@TiO2 Heterojunction Nanocomposites for Photocatalytic Reduction of CO2

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag3PO4/g-C3N4/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

Engineering Layered Double Hydroxide–Based Photocatalysts Toward Artificial Photosynthesis: State‐of‐the‐Art Progress and Prospects

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Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation