Drastic Improvement of 1D-CdS Solar-Driven Photocatalytic Hydrogen Evolution Rate by Integrating with NiFe Layered Double Hydroxide Nanosheets Synthesized by Liquid-Phase Pulsed-Laser Ablation

Lee, Hwan; Reddy, D. Amaranatha; Kim, Yujin; Chun, So Yeon; Ma, Rory; Kumar, D. Praveen; Song, Jae Kyu; Kim, Tae Kyu

doi:10.1021/acssuschemeng.8b04000

Cited by 45 publications

(30 citation statements)

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“…As seen from Figure 5a, the high resolution XPS spectrum of Cd-3d core-level exhibit two peaks at 404.32 and 411.10 eV for the C-6 sample. These two binding energy peaks separated by ~6.8 eV are ascribed to Cd-3d5/2 and Cd-3d3/2 for Cd 2+ in CdS [42,43]. Next Figure 5b shows the XPS spectrum of S-2p core level which displayed two binding energy peaks around 160.78 and 161.94 eV corresponding to the S-2p3/2 and S-2p1/2 respectively.…”

Section: Morphological and Structural Studiesmentioning

confidence: 91%

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

et al. 2020

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One dimensional (1D) metal sulfide nanostructures are one of the most promising materials for photocatalytic water splitting reactions to produce hydrogen (H 2 ). However, tuning the nanostructural, optical, electrical and chemical properties of metal sulfides is a challenging task for the fabrication of highly efficient photocatalysts. Herein, 1D CdS nanorods (NRs) were synthesized by a facile and low-cost solvothermal method, in which reaction time played a significant role for increasing the length of CdS NRs from 100 nm to several micrometers. It is confirmed that as the length of CdS NR increases, the visible photocatalytic H 2 evolution activity also increases and the CdS NR sample obtained at 18 hr. reaction time exhibited the highest H 2 evolution activity of 206.07 µmol.g −1 .h −1 . The higher H 2 evolution activity is explained by the improved optical absorption properties, enhanced electronic bandstructure and decreased electron-hole recombination rate.Nanomaterials 2020, 10, 619 2 of 17 evolution reactions [18][19][20][21][22][23]. It is testified that the photocatalytic H 2 evolution activity of CdS greatly depends on its crystal structure, morphology, crystallinity and size [24], and all these parameters directly impact the band structures, bandgap energy and further electron-hole separation processes. Therefore, the design and synthesis of CdS nanostructures with higher surface areas, charge separation efficiency and with abundant active sites are indeed important.Meanwhile, one dimensional (1D) CdS nanostructures have received particular attention for the visible photocatalytic H 2 evolution reactions due to their distinctive geometrical and electronic properties, which can provide large aspect-ratio, direct pathways for charge transport and decouple the direction of charge carrier collection [25,26]. In addition to the fast and long-distance photoexcited electron transport, high length-to-diameter of 1D nanostructures could improve the light absorption and scattering, which benefits the photocatalysis [27][28][29][30][31]. As a result, 1D nanostructures offer a suitable platform for understanding fundamental concepts about the roles of dimensionality and size in optical, electrical, and for photocatalytic solar energy conversion applications [27,32]. Among the several methods for the preparation of 1D CdS, the solvothermal approach is one of the ideal methods due to its simplicity, low cost, scalability, possibilities for the precise control of nucleation/growth, crystal structure, size and morphology [33]. Mostly, 1D CdS nanorods were synthesized by using ethylenediamine as solvent, for example, Jang et al utilized the solvothermal approach and obtained CdS nanowires at different reaction temperatures and times [34]. Next, Li et al. synthesized CdS nanorods (NRs) by using the hydrothermal method in which ethylenediamine acts as the template and coordination agent [35]. The results showed that the photocatalytic H 2 evolution activities of CdS samples depend on the crystallinity, morphology and s...

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Section: Morphological and Structural Studiesmentioning

confidence: 91%

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

et al. 2020

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“…1D/2D CdS/NiFe‐LDH demonstrated high hydrogen evolution of 280 mmol g −1 after 38 h with no evident structural changes after the catalytic reaction, therefore addressing the intrinsic poor stability of CdS. [ 118 ] Other metal sulfides such as 1D Co 9 S 8 nanowires [ 119 ] and 2D MoS 2 nanosheets [ 120 ] have also been reported to pair well with LDH for the formation of well‐contacted heterojunctions toward photocatalytic enhancement.…”

Section: Modification Of Ldh Photocatalystsmentioning

confidence: 99%

“…The CdS/NiFe‐LDH nanocomposite also displays a reduced lifetime of 0.15 ns compared to CdS nanorods (0.19 ns), resulting in a fast transfer of electrons, which boosts the H 2 production reaction. [ 118 ]…”

Section: Applications Of Ldh‐based Photocatalysts For Artificial Photosynthesismentioning

confidence: 99%

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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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“…It has a narrow bandgap (∼2.4 eV), and its conduction band edge position is more negative than the reduction potential of CO 2 . However, the photoconversion efficiency of bare CdS is low due to its high charge carrier recombination rate and susceptibility to photocorrosion . Loading the surface of CdS with another semiconductor or a co‐catalyst to enhance photocatalytic activity has been a successful strategy.…”

Section: Introductionmentioning

confidence: 99%

Indium Phosphide Quantum Dots Integrated with Cadmium Sulfide Nanorods for Photocatalytic Carbon Dioxide Reduction

et al. 2020

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Photocatalytic conversion of CO 2 into storable fuels is an attractive way to simultaneously address worldwide energy demands and environmental problems. Semiconductor quantum dots (QDs) have gained prominence as candidates for photocatalytic applications due to their many advantages, which include tunability for advanced electronic, optical, and surface properties. Indium phosphide (InP) quantum dots are semiconducting QDs with enormous potential for solar-driven CO 2 reduction. Their advantages include a tunable bandgap, diverse surface chemistry, and nontoxicity. InP QDs and CdS nanorods were integrated using a simple and inexpensive method. CO 2 photoreduction by the CdS-InP composites was evaluated in aqueous solution using triethanolamine as a sacrificial donor. The crystal structures, surface compositions, and morphologies were investigated via X-ray diffraction analysis, X-ray photoelectron spectroscopy, and transmission electron microscopy, respectively. The UV-visible diffuse reflectance spectra of the CdS-InP composites indicated efficient visible light utilization in the 500-550 nm range. The results of photoelectrochemical and photoluminescence analyses illustrated effective charge separation in the composites. The photocatalytic activity of the as-synthesized composites was superior to that of pure CdS. The CO evolution rate of the optimized composite was 216 μmol h À 1 g À 1 during the first three hours of irradiation and increased steadily over the next 62 hours. We also studied the influences of different solvents, the hole scavenger concentration, and catalyst loading on the performance of the optimized composite.

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Drastic Improvement of 1D-CdS Solar-Driven Photocatalytic Hydrogen Evolution Rate by Integrating with NiFe Layered Double Hydroxide Nanosheets Synthesized by Liquid-Phase Pulsed-Laser Ablation

Cited by 45 publications

References 50 publications

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

Controlled Growth and Bandstructure Properties of One Dimensional Cadmium Sulfide Nanorods for Visible Photocatalytic Hydrogen Evolution Reaction

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

Indium Phosphide Quantum Dots Integrated with Cadmium Sulfide Nanorods for Photocatalytic Carbon Dioxide Reduction

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