Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-9
·
IF 3.578
Liu Hongdong,Lin Ye,Zhang Lei
To overcome the deficiency of the volume expansion of MoS 2 as the anode material for lithium-ion batteries (LIBs), an effective strategy was developed to design hierarchical porous MoS 2 /carbon nanospheres via a facile, easy-operated hydrothermal method followed by annealing. FESEM and TEM images clearly showed that nanospheres are composed of ultra-thin MoS 2 /C nanosheets coated with carbon layer and possess an expanded interlayer spacing of 0.98 nm. As anodes for LIBs, MoS 2 /carbon nanospheres deliver an initial discharge capacity of 1307.77 mAh g −1 at a current density of 0.1 A g −1 . Moreover, a reversible capacity of 612 mAh g −1 was obtained even at 2 A g −1 and a capacity retention of 439 mAh g −1 after 500 cycles at 1 A g −1 . The improved electrochemical performance is ascribed to the hierarchical porous structure as well as the intercalation of carbon into lattice spacing of MoS 2 , which offers fast channels for ion/electron transport, relieves the influence of volume change and increases electrical conductivity of electrode. Meanwhile, the expanded interlayer spacing of MoS 2 in MoS 2 /C can decrease the ion diffusion resistance and alleviate the volumetric expansion during discharge/charge cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 35
·13351-13360
·
IF 4.569
Shuai Yang,Jing Wu,Chao Wang,Hong Yan,Luoqiao Han,Jianmin Feng,Bo Zhang,Dejun Li,Gui Yu,Birong Luo
The controllable fabrication of two-dimensional transition-metal dichalcogenides (2D TMDs) and a deep understanding of the corresponding process mechanisms are of fundamental importance for their further applications. In this study, the molten-droplet-driven (MDD) growth of MoS2 based on a Na–Mo–O molten-salt chemical vapor deposition (CVD) method is demonstrated via temperature-dependent dispersion and spreading of droplets on a surface, yielding MoS2 flakes with morphology transition from compact triangles to fractal dendrites with the increase in temperature. By building up the dependence between the formed morphologies of grown MoS2 flakes and the corresponding kinetics during successive growth processes, it was found that the wetting-driven force, which is governed by interface free energies (surface tension) of molten droplets, would largely determine the driven movement of the droplet, and then the formation of different morphologies. Finally, based on these MoS2 flakes, a systematic improvement of the hydrogen evolution reaction (HER) was demonstrated in accordance with the evolution of morphologies from compact to fractal. This study presents an important advance in understanding the growth mechanisms related to the molten-salt-assisted CVD fabrication of 2D TMDs and provides a facile method for tailoring the growth and application of 2D TMDs with controllably trimmed morphologies.
研究领域:
材料科学
·
纳米科技
·
催化化学
·
表面科学
·
无机合成
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 9
·3034-3045
·
IF 8.8
Ning Xue-Er,Jia Dian-Zeng,Li Shan-Hao,Khan Muhammad Farooq,Hao Ai-Ze
A highly efficient piezocatalyst of oxygen-incorporated MoS 2 (O-MoS 2 ) was designed and successfully synthesized via facile modulation of hydrothermal process temperature method. Remarkably, a superior piezocatalytic H 2 evolution rate of 46.1 μmol·g −1 ·h −1 in pure water and 921.0 μmol·g −1 ·h −1 in methanol solution is obtained on optimal O-MoS 2 -180 (with a hydrothermal process temperature of 180 °C), outperforming pristine MoS 2 and most of the reported other catalysts. Moreover, piezocatalytic activity of O-MoS 2 toward the degradation of organic pollutants depends on hydrothermal temperatures. The suitable temperature of O-MoS 2 -180 presents dramatically excellent piezocatalytic capacity compared with the pristine MoS 2 for degradation of methylene blue (MB) dye. The reaction rate constant of O-MoS 2 -180 reaches to 54.6 × 10 −3 min −1 , which is nearly 18 and 4-folds in contrast with pristine MoS 2 and O-MoS 2 -140 (with a hydrothermal process temperature of 140 °C), respectively. Simultaneously, it also manifests that O-MoS 2 -180 endows relatively high degradation efficiency (84.6% within 30 min) and excellent stability. Moreover, it is also demonstrated that optimal O-MoS 2 can dramatically promote charge carriers transport and separation. Furthermore, our theoretical calculation results suggest that the oxygen-incorporated can modulate the surface electronic state, enhance active sites as well as optimize the hydrogen adsorption Gibbs free energy of MoS 2 , thus extremely boosting piezocatalytic efficiency. Ultimately, an innovative piezocatalytic mechanism is proposed to reveal and expound the relationship between piezocatalytic property and oxygen-incorporated role. Graphical abstract
研究领域:
材料科学
·
环境科学
·
物理化学
·
纳米催化
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能源材料
·
表面科学
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 17
·1703818
·
IF 9.598
Zhi Chen,Dangui Yin,Ming Zhang
Sandwich-like MoS 2 @SnO 2 @C nanosheets are prepared by facile hydrothermal reactions. SnO 2 nanosheets can attach to exfoliated MoS 2 nanosheets to prevent restacking of adjacent MoS 2 nanosheets, and carbon transformed from polyvinylpyrrolidone is coated on MoS 2 @SnO 2 , forming a sandwich structure to maintain cycling stability. As an anode for sodium-ion batteries, the electrode greatly deliverers a high initial discharge specific capacity of 530 mA h g −1 and maintains at 396 mA h g −1 after 150 cycles at 0.1 A g −1 . Even at a large current density of 1 A g −1 , it can hold 230 mA h g −1 after 450 cycles. Besides, as an anode for K + storage, the electrode also shows a discharge capacity of 312 mA h g −1 after 25 cycles at 0.05 A g −1 . This work may provide a new strategy to prepare other composites which can be applied to new kind of rechargeable batteries.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qun-Zeng Huang,Yan Xiong,Qian Zhang,Hong-Chang Yao,Zhong-Jun Li
Development of noble metal-free and highly efficient co-catalyst that endows semiconductor materials with high performance is of great significance towards enhancing photocatalytic H 2 evolution. Herein, a series of novel Mn 0.25 Cd 0.75 S/MoS 2 composites have been successfully prepared by a facile one-step hydrothermal method . The photocatalytic activity of the as-prepared photocatalysts for H 2 production from water splitting under visible-light irradiation (λ ≥ 400 nm) was investigated. The results showed that Mn 0.25 Cd 0.75 S/MoS 2 heterostructured composites have a higher photocatalytic activity than Mn 0.25 Cd 0.75 S, implying that the intimate interfacial contact between Mn 0.25 Cd 0.75 S and MoS 2 facilitates electron transfer from Mn 0.25 Cd 0.75 S to MoS 2 , thus promoting the separation of photogenerated charge carriers and providing more active sites for H 2 evolution reaction. The introduction of noble metal-free MoS 2 co-catalyst led to a remarkable improvement in the photocatalytic H 2 evolution activity of Mn 0.25 Cd 0.75 S, and the content of MoS 2 in composite had an important influence on the photocatalytic activity. It was confirmed that 0.7 wt% of MoS 2 loading content achieves a maximum photocatalytic H 2 evolution rate of 12.47 mmol g −1 h −1 , which was much higher than that of Mn 0.25 Cd 0.75 S and also slightly higher than that of Mn 0.25 Cd 0.75 S/Pt (1.0 wt%). This work revealed that low cost MoS 2 could replace noble metal Pt as a highly efficient co-catalyst in enhancing the photocatalytic activity of semiconductor materials.
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2023
·Vol. 9
·期 6
·1122-1128
·
IF 9.4
Yanze Wu,Lin Wang,Zhifang Chai,Weiqun Shi
Two-dimensional layered transition metal carbides (MXenes), have huge potential advantage for applications in hydrogen evolution reaction (HER). However, the hindered hydrogen evolution at large current densities and the instability of MXenes during HER remains major challenges. Herein, we report the MoS 2 /Mo 2 CT x nanoarray with aerophobic structure via molten salt synthesis. In situ vertical distribution of MoS 2 nanoarray on the surface of Mo 2 CT x accelerates hydrogen gas release from the electrode, exhibiting significantly enhanced catalytic activity and stability to bare MoS 2 and Mo 2 CT x . The MoS 2 /Mo 2 CT x nanoarray possesses excellent stability at −100 mA/cm 2 for 100 h with only 3% overpotential increase. Our work provides guidance for developing high-stability MXene-based catalysts by virtue of in situ bonding between nanoarray and MXene.
✓ 已验证
DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2024
·Vol. 68
·期 2
·226811
·
IF 6.4
Liu Xueying,Liu Shiying,Xiao Yulong,Xu Chang,Wu Jiaxin,Li Kaihui,Li Si-Yu,Pan Anlian
Twisted transition metal dichalcogenides (TMDs) homo-bilayers host unique quantum properties, which can be tuned by interlayer twist angle θ . However, the systematic evolution of their typical electronic properties with respect to the twist angle θ , which is crucial for identifying the “special angle” analogous to the “magic angle” of twisted bilayer graphene in correlation physics studies, remains incompletely understood. Here, via scanning tunneling microscopy (STM) and spectroscopy (STS), we investigate the variation of the moiré potential, flat band, and layer polarization characteristics across a wide range of twist angle θ in twisted bilayer MoS 2 (TB-MoS 2 ). The moiré potential of the valence band exhibits a non-monotonic variation with θ , peaking at a maximum value up to 204 meV at θ ∼1.7°. Concurrently, at the same θ , the bandwidth of the flat band at the Γ V point of the valence band attains its minimum, precisely signifying the “special angle” θ c ∼1.7° in TB-MoS 2 . Interestingly, layer polarization in the moiré superlattice is spatially visualized through the distribution of local density of states (LDOS) at the energies of both Γ V and K V points of the valence band, where the polarization degree at the Γ V point demonstrates a close dependency on θ . Our findings deepen understanding of twist-angle effect in TMDs, advancing both fundamental physics and practical application.
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2023
·
IF 5
Shizhou Tan,Pengcheng Jian,Maocheng Shan,Yongming Zhao,Zhihua Zheng,Yiming Yang,Yuhui Zeng,Dan Xu,Zhenyu Chen,Changqing Chen,Feng Wu,Jiangnan Dai
In this work, we demonstrated tunable structured AlGaN-based nanoporous (NP) distributed Bragg reflectors (DBRs) with high-reflectivity through one-step vertical-lateral electrochemical etching (ECE). The aperture of nanopores in the doping layer and the size and density of V-pits on the surface of NP-DBRs can be tuned by controlling the etching bias. Furthermore, by further tuning the thickness of alternating layers, we achieved high reflectivity of NP-DBRs at multiple center wavelengths within the wavelength range from 280 to 800 nm. To explore its potential applications, MoS 2 with a photoluminescence (PL) emission in the red light region was grown for the first time on the NP-DBRs. Due to the light localized effect of surface V-pits and the high reflectivity of the bottom DBRs , the PL intensity of MoS 2 was significantly enhanced by a factor of 37.3 compared to the region without NP-DBRs. The PL enhancement of MoS 2 on porous AlGaN and different periodic NP-DBRs further validated the PL enhancement mechanism. The corresponding theoretical simulations also revealed that the PL enhancement should be attributed to the combined effect of enhanced light absorption and NP-DBRs induced emission interference. The fabricated AlGaN-based NP-DBRs provide a new approach for improving the quantum efficiency of two-dimensional layered materials, which holds significant importance for advancing the development of miniaturized and integrated 2D/3D heterogeneous structure systems in the field of optoelectronics.
研究领域:
光电子学
·
半导体材料
·
纳米光子学
·
二维材料
·
固体物理
·
表面科学
·
集成光子器件
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhong Dong,Xu Wu,Mengying Chen,Hanxiao Chen,Ke-Jing Huang,Lingling Wang,Jing Xu
Pure phase MoS 2 has low conductivity, but with high theoretical specific capacity, and WS 2 possesses a high intrinsic conductivity, but suffer from rapid capacity fading. Predictably, the combination of these two transition metal sulfide compounds can complement each other and improve electrochemical performance comprehensively. Whereas, bimetallic phase sulfide of MoS 2 and WS 2 composites have not been researched in SIBs . In this paper, 1T metallic phase MoS 2 and WS 2 vertically growth on flexible carbon cloth (CC) surface (1T-MoS 2 @WS 2 @CC) by a simple hydrothermal method. The electrochemical performance was improved by heterojunction synergistic effect and the enhanced interlayers of the composite material. Specifically, the superelevation reversible capacity of 529.4 mAh/g can be obtained even after 100 cycles at the current density of 100 mA g −1 , and the 259.2 mAh/g capacity can be maintained even at high current density of 1000 mA g −1 after 60 cycles. Besides, the designed 1T-MoS 2 @WS 2 @CC composite material has excellent rate performance and cycle stability which are guarantee for battery core performance. Thus, there is every reason to believe that the advanced 1T-MoS 2 @WS 2 @CC electrode material has great potential in the future high performance energy storage devices.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yu Liu,Haoting Niu,Wei Gu,Xiaoyu Cai,Baodong Mao,Di Li,Weidong Shi
Exploration of highly active and noble-metal-free photocatalysts for high-efficiency photocatalytic water splitting is of great importance. Herein, a facile and effective in-situ hydrothermal method has been developed for preparation of CdS/MoS 2 heterostructures with a unique hollow microbox morphology for visible-light-driven water splitting into H 2 . The influence of MoS 2 is systematically investigated in terms of optical properties and photocatalytic activity of the CdS/MoS 2 microboxes by varying the concentration of sodium molybdate. Under visible-light irradiation (λ ≥ 420 nm), the CdS/MoS 2 microboxes exhibit superior photocatalytic H 2 evolution activity (1.36 mmol/g/h) compared to pure CdS microboxes (0.04 mmol/g/h), corresponding to an apparent quantum yield of 14.5% at 420 nm. Photocatalytic mechanism study proves that the MoS 2 nanosheets can serve as a co-catalyst and electron acceptor, for the effective promotion of electron transfer and separation of photogenerated charge carriers from CdS to further stimulate the surface H 2 evolution kinetics. Furthermore, the well-defined interior voids, low density and shell permeability of the hierarchical CdS/MoS 2 microboxes also contribute to the improvement of the photocatalytic performance.
研究领域:
材料科学
·
光催化
·
氢能
·
纳米材料
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Tao Shen,Feng Li,Zhenyun Zhang,Lei Xu,Junjie Qi
Monolayer MoS2, a direct bandgap transition metal dichalcogenide (TMD), has attracted worldwide attention in electronics and optoelectronics. However, the performance of photodetectors based on monolayer MoS2 is restricted to a weak optical absorption, narrow absorption range, and persistent photoconductance. Herein, benefiting from an easy solution process, high light absorption coefficient, and wide absorption range, environment-friendly CuInSe2 quantum dots (QDs) are hybridized with monolayer MoS2 for high-performance broadband photodetectors. Owing to the favorable type-II energy band alignment of MoS2/CuInSe2-QDs, the hybrid photodetector exhibits a broadband photoresponse from the ultraviolet to near-infrared region, with an ultrahigh photoresponsivity of 74.8 A/W at 1064 nm, and compared with those of the pristine MoS2 device, the photoresponsivity and specific detectivity in the ultraviolet–visible region were enhanced by about 30 and 20 times, respectively. Furthermore, the formed depletion region at the MoS2/CuInSe2-QDs interface can significantly increase the photoresponse speed, and the accumulated holes in the QD side induce a strong photogating effect to improve the photoresponsive characteristics of the hybrid photodetector. Our work opens up opportunities for fabricating high-performance monolayer TMD-based broadband photodetectors.
研究领域:
光电子学
·
纳米材料
·
量子点
·
光电探测器
·
二维材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 18
·12344-12354
·
IF 3.9
Guanhua Yang,Xu Wang,Yihong Li,Zhiguo Zhang,Jiayu Huang,Fenghua Zheng,Qichang Pan,Hongqiang Wang,Qingyu Li,Yezheng Cai
Layered graphene and molybdenum disulfide have outstanding sodium ion storage properties that make them suitable for sodium-ion batteries (SIBs). However, the easy and large-scale preparation of graphene and molybdenum disulfide composites with structural stability and excellent performance face enormous challenges. In this study, a self-supporting network-structured MoS2/heteroatom-doped graphene (MoS2/NSGs-G) composite is prepared by a simple and exercisable electrochemical exfoliation followed by a hydrothermal route. In the composite, layered MoS2 nanosheets and heteroatom-doped graphene nanosheets are intertwined with each other into self-supporting network architecture, which could hold back the aggregation of MoS2 and graphene effectively. Moreover, the composite possesses enlarged interlayer spacing of graphene and MoS2, which could contribute to an increase in the reaction sites and ion transport of the composite. Owing to these advantageous structural characteristics and the heteroatomic co-doping of nitrogen and sulfur, MoS2/NSGs-G demonstrates greatly reversible sodium storage capacity. The measurements revealed that the reversible cycle capacity was 443.9 mA h g−1 after 250 cycles at 0.5 A g−1, and the rate capacity was 491.5, 490.5, 453.9, 418.1, 383.8, 333.1, and 294.4 mA h g−1 at 0.1, 0.2, 0.5, 1, 2, 5 and 10 A g−1, respectively. Furthermore, the MoS2/NSGs-G sample displayed lower resistance, dominant pseudocapacitive contribution, and faster sodium ion interface kinetics characteristic. Therefore, this study provides an operable strategy to obtain high-performance anode materials, and MoS2/NSGs-G with favorable structure and excellent cycle stability has great application potential for SIBs.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）