600 nm-driven photoreduction of CO2 through the topological transformation of layered double hydroxides nanosheets

Wang, Zelin; Xu, Simin; Tan, Ling; Liu, Guihao; Shen, Tianyang; Yu, Can; Wang, Hao; Ye, Tao; Cao, Xingzhong; Zhao, Yufei; Song, Yu‐Fei

doi:10.1016/j.apcatb.2020.118884

Cited by 55 publications

(28 citation statements)

References 61 publications

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“…From the Tauc analyses ( Figure S20), the band gaps for Cu 2 Oand LDH were estimated to be % 2.03 and 3.08 eV,respectively.Thus,it would be reasonable to infer that upon visible light irradiation of U-Cu 2 O-2, only Cu 2 Ow ould be photoexcited to generate electrons and holes for surface redox reactions,w ith the underlying LDH simply serving as astructural support in the pNRR process. [33] This coincides with what was observed in the photo-deposition experiments (see Figure S21), Pt and Au nanoparticles formed next to the ultrafine Cu 2 O( i.e.t he reduction of Pt 2+ to Pt 0 or Au 3+ to Au 0 would preferentially occur in the vicinity of Cu 2 Orather than on the exposed LDH nanosheets), thus confirming simultaneously that ultrafine Cu 2 Oacted as the light absorption unit and active species for pNRR. [8a, 34] Thereduction potentials of N 2 on u-Cu 2 O-0.05M-2h and b-Cu 2 O/LDH were determined from electrochemical measurements ( Figure S22).…”

Section: Methodssupporting

confidence: 85%

Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

et al. 2020

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Cu2O, a low‐cost, visible light responsive semiconductor photocatalyst represents an ideal candidate for visible light driven photocatalytic reduction of N2 to NH3 from the viewpoint of thermodynamics, but it remains unexplored. Reported here is the successful synthesis of uniformly sized and ultrafine Cu2O platelets, with a lateral size of <3 nm, by the in situ topotactic reduction of a CuII‐containing layered double hydroxide with ascorbic acid. The supported ultrafine Cu2O offered excellent performance and stability for the visible light driven photocatalytic reduction of N2 to NH3 (the Cu2O‐mass‐normalized rate as high as 4.10 mmol gCu2normalO −1 h−1 at λ>400 nm), with the origin of the high activity being long‐lived photoexcited electrons in trap states, an abundance of exposed active sites, and the underlying support structure. This work guides the future design of ultrafine catalysts for NH3 synthesis and other applications.

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Section: Methodssupporting

confidence: 85%

Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

et al. 2020

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“…Similar results were also presented in calcinated NiAl-LDH under different temperature (NiAl-x (x = 200, 275, 400, 600 and 800)). [35] Detailed fitting results in R-space of Ni K-edge indicated that the LDH structure was kept in NiAl-x (x = 200, 250). According to coordination number (N) and bond length, the formation of NiO was demonstrated when increasing the calcination temperature from 275°C.…”

Section: Defect Structurementioning

confidence: 99%

“…Catal. B: Environ., 2020, 270, 118884 [35] 300 W Xe 600-800 nm In recent years, g-C N was regarded as a promising alternative photocatalyst to replace traditional metal-containing photocatalysts. [31] The 2D/2D interface heterostructures of g-C 3 N 4 /NiAl-LDHs was studied and the photocatalytic performance in CO 2 PR was investigated by Ogale et al in 2018 (Figure 5c-d).…”

Section: Electronic Structurementioning

confidence: 99%

“…[11] Figure 7. a) schematic illustration in the synthesis process of NiAl-x, b) the relationship between selective of CH 4 and relative vacancy concentration in NiAl-x; c) the WT-EXAFS (wavelet transforms) and d) R space of the Ru Kedge EXAFS spectra, e) schematic illustration of Ru1/mono-NiFe-LDH. [35,44] strategies, LDHs-based catalysts successfully achieved the controllable selectivity of CO PR. However, the stability of defective sites and the precise control of a single defect (e. g.: V OH or V M ) are still expected to develop in the next few decades.…”

Section: Defect Structurementioning

confidence: 99%

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Recent Progress on Nanostructured Layered Double Hydroxides for Visible‐Light‐Induced Photoreduction of CO₂

Tan

Wang

Zhao

et al. 2020

Chemistry An Asian Journal

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Photoreduction of CO 2 into solar fuels is usually regarded as one of the promising solutions to overcome environmental pollution and the energy crisis. The main challenge in CO 2 photoreduction (CO 2 PR) is the low efficiency and poor selectivity. Layered double hydroxides (LDHs) are a class of 2D materials, consisting with M(OH) 6 octahedra in the host layers and intercalated anions. Owing to the tuneable composition, particle size, morphology, and virtue coordinatively unsaturated active sites, a series of efficient strategies (morphology control, heterostructure, defect control, etc.) in LDH-based photocatalysts have been efficiently developed to enhance the photocatalytic selectivity and activity for CO 2 PR. This review summarizes recent progress on the LDH-based photocatalysts for CO 2 PR. Al 3 + and transition metal elements, Fe 2 + , Co 2 + , Ni 2 + , Zn 2 + , Cr 3 + , Fe 3 + , etc.) in the laminate layers and A nÀ is the interlaminated anion (such as: NO 3 À , CO 3 2À and SO 4 2À , etc.) in the interlayer. [6b,c,7] It has been widely applied in photocatalyst in the past decades. [8] Ascribe to the tunable atomic structure, the bandgap of LDHs can be tuned from 2.0 eV to 5.4 eV by changing the composition of layer. [9] Moreover, the surface defects (such as: V M , metal vacancy and V OH , hydroxyl vacancy, etc.) as active sites in photocatalysis can be easily introduced by controlling the thickness and size of LDHs etc., thus promoting the efficiency of CO 2 PR. This review focuses on the recent development of the LDHs-based photocatalysts for CO 2 PR, and the corresponding progress of CO 2 PR has achieved great progress from the former CO 2 conversion rate of~1 μmol g À 1 h À 1 to recent 218130 μmol g À 1 h À 1 , and the desirable valuable-product also move from CO to CH 4 and methanol. The major strategies of promoting the CO 2 PR are discussed from different perspective from the morphology and composition, electronic structure, and defects structure for further understanding the relationship between the structure and activity.

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“…This is observed from a UV–vis spectra, whereby NiAl‐LDHs show distinct color when they are calcined at 200 and 250 °C (Figure 5c). [ 47 ] Notably, thermal treatment of LDH should not be extremely high as the LDH could decompose and form mixed metal oxide (MMO). [ 48 ] The MMO can be restored back to LDH through hydration, which is another fascinating approach to prepare LDH via reconstruction.…”

Section: Synthesis and Properties Of Ldhmentioning

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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600 nm-driven photoreduction of CO2 through the topological transformation of layered double hydroxides nanosheets

Cited by 55 publications

References 61 publications

Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

Recent Progress on Nanostructured Layered Double Hydroxides for Visible‐Light‐Induced Photoreduction of CO₂

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

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600 nm-driven photoreduction of CO2 through the topological transformation of layered double hydroxides nanosheets

Cited by 55 publications

References 61 publications

Sub‐3 nm Ultrafine Cu2O for Visible Light Driven Nitrogen Fixation

Sub‐3 nm Ultrafine Cu2O for Visible Light Driven Nitrogen Fixation

Recent Progress on Nanostructured Layered Double Hydroxides for Visible‐Light‐Induced Photoreduction of CO2

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

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Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

Sub‐3 nm Ultrafine Cu₂O for Visible Light Driven Nitrogen Fixation

Recent Progress on Nanostructured Layered Double Hydroxides for Visible‐Light‐Induced Photoreduction of CO₂