Ionic liquid assisted hydrothermal synthesis of MoS<sub>2</sub> double-shell polyhedral cages with enhanced catalytic hydrogenation activities

Li, Jiahe; Wang, Donge; Ma, Huaijun; Li, Min; Pan, Zhizhong; Jiang, Yu-Xia; Tian, Zhijian

doi:10.1039/c7ra02482g

Cited by 15 publications

(10 citation statements)

References 37 publications

(32 reference statements)

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“…Herein the splitting of the typical peak (002) brings out two separated diffraction peaks, which are located at 9.0° and 17.8°, respectively. The splitting can be attributed to the expansion of basal spacing induced by the intercalated species, similar to our previous results. , The supporters in MoS 2 /P25 nanocatalysts with different loadings of MoS 2 show approximately the same phase composition with pure supporter P25-400 (seen in Figure S1). Therefore, the loading of MoS 2 has no effect on the phase compositions of supporters.…”

Section: Resultssupporting

confidence: 89%

“…Besides, unsupported MoS 2 nanosheets with short slab and few-stacking layers can be synthesized by bottom-up method, especially wet chemical synthesis such as hydrothermal/solvothermal method, which can accurately tailor the structures of MoS 2 materials. The unsupported MoS 2 nanosheets with few stacking layers and short slab can greatly improve the exposure of active sites and thus demonstrate greatly enhanced catalytic activities. − However, the unsupported MoS 2 nanosheets often aggregate into large particles or assemble into special morphologies to reduce the surface energy. − The self-aggregation of MoS 2 nanosheets can result in the embedment of partial active sites. Therefore, only partial exposed active sites can make contact with the reactant during the catalytic hydogenation.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

Wang

Zheng

et al. 2019

ACS Appl. Nano Mater.

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Developing highly dispersed few stacking layer MoS2 nanocatalysts with high exposure of active sites is still a challenge in improving their catalytic activities. Herein, we report a facile strategy for fabricating quasi-single-layer (<3 layers) MoS2/TiO2 nanocatalysts by a novel one-step hydrothermal method using ammonium tetrathiomolybdate (ATM) and P25 (TiO2) as Mo precursor and highly dispersed supporter, respectively. MoS2 nanosheets on MoS2/TiO2 nanocatalysts with the quasi-single layer and slab of less than 10 nm expose maximum active sites of the catalytic anthracene hydrogenation. The results of the catalytic anthracene hydrogenation in slurry-bed reactor show that the quasi-single-layer MoS2/TiO2 nanocatalyst exhibits optimized catalytic hydrogenation performance with the selectivity to deep hydrogenation product (AH8) of 51% and hydrogenation percentage of 41.4%, which were respectively about 5.7 times and twice those of unsupported MoS2 catalyst. The outstanding catalytic activity of anathracene hydrogenation over the resultant quasi-single-layer MoS2/TiO2 can be ascribed to the superior structures of MoS2/TiO2 nanocatalysts. The uniform loading of quasi-single-layer MoS2 nanosheets onto the TiO2 can remarkably enhance the exposure of active sites and effectively avoid the self-aggregation of MoS2 nanosheets.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

Wang

Zheng

et al. 2019

ACS Appl. Nano Mater.

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“…The diffraction peaks of OA-RGO-MoS 2 and RGO-MoS 2 , which belong to the (002) crystal plane of MoS 2 , appear at 13.2 ° and 13.7 ° respectively, which is inconsistent with the interlayer spacing of standard MoS 2 (002) diffraction peak at 14.4° (0.62 nm). This phenomenon is attributed to MoS 2 material with low stacking degree and extended layer spacing synthesized by hydrothermal reaction [23][24]. Compared with MoS 2 , the (002) crystal plane of the two has a low angle shift, and the (002) crystal plane was the position of the S-Mo-S layer of molybdenum disul de, and its peak intensity is proportional to the stacking degree of lamellae.…”

Section: Methodsmentioning

confidence: 99%

On the Tribological Properties of RGO–MoS2 Composites Surface Modified by Oleic Acid

et al. 2022

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Purpose To study the effect of oleic acid surface modi ed RGO/MoS 2 composite lubricating additives on the friction and wear properties of 10 # White Oil (10 # WO).Method The in uence of different concentrations of reduction graphene oxide/molybdenum disul de (RGO-MoS 2 ) and oleic acid surface modi ed reduction graphene oxide/molybdenum disul de (OA-RGO-MoS 2 ) on the lubricating properties in 10 # WO was investigated by using a four-ball long-term friction and wear tester. The microscopic morphology, lattice structure, composition and element valence of the prepared material were characterized by scanning electron microscope, Raman spectroscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, element analyzer and other instruments. The diameter, structure, morphology, composition and element valence state of the wear scar were obtained by multifunctional universal tool microscope, scanning electron microscope and X-ray photoelectron spectroscopy.Result In the RGO-MoS 2 white oil system, when 0.4 wt% RGO-MoS 2 was added, the anti-friction effect was the best, and the average friction coe cient (AFC) reduced by 21.8%. When 0.2 wt% RGO-MoS 2 was added, the anti-wear effect was the optimal, and the average wear scar diameter (AWSD) decreased by 12.4%. In the OA-RGO-MoS 2 white oil system, when 0.2 wt% OA-RGO-MoS 2 was added, the anti-friction and anti-wear effects were the best, and the AFC reduced by 33.3%, and AWSD reduced by 14.1%. ConclusionCompared with RGO-MoS 2 , OA-RGO-MoS 2 has a higher degree of graphitization, larger interlayer spacing, lower degree of layered accumulation, higher MoS 2 load, and weaker thermal stability.Both lubricating additives have good anti-friction and anti-wear effects at low concentrations, and the anti-friction and anti-wear effects are more prominent after being modi ed by oleic acid. Analysis of friction mechanism shows that a lubricating protective lm containing iron, oxygen, molybdenum, carbon, and sulfur is formed through adsorption or tribochemical reaction during the friction process, which improves the lubrication state and plays a role in reducing friction and anti-wear.

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“…Among them, MoS 2 has a larger interlayer spacing (0.62 nm) compared to graphite, which is beneficial to accelerating kinetic processes. Li et al [14] prepared flower-like MoS 2 , which showed remarkable performance in lithium-ion batteries. Kumar et al [15] explored the binder effect on electrochemical capacity; the obtained MoS 2 microflower presented 595 mAh g −1 under a current density of 50 mA g −1 with a Na-alginate binder.…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole Modified MoS2 Nanorod Composites as Durable Pseudocapacitive Anode Materials for Sodium-Ion Batteries

Jia

Yuan

et al. 2022

Nanomaterials

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As a typical two-dimensional layered metal sulfide, MoS2 has a high theoretical capacity and large layer spacing, which is beneficial for ion transport. Herein, a facile polymerization method is employed to synthesize polypyrrole (PPy) nanotubes, followed by a hydrothermal method to obtain flower-rod-shaped MoS2/PPy (FR-MoS2/PPy) composites. The FR-MoS2/PPy achieves outstanding electrochemical performance as a sodium-ion battery anode. After 60 cycles under 100 mA g−1, the FR-MoS2/PPy can maintain a capacity of 431.9 mAh g−1. As for rate performance, when the current densities range from 0.1 to 2 A g−1, the capacities only reduce from 489.7 to 363.2 mAh g−1. The excellent performance comes from a high specific surface area provided by the unique structure and the synergistic effect between the components. Additionally, the introduction of conductive PPy improves the conductivity of the material and the internal hollow structure relieves the volume expansion. In addition, kinetic calculations show that the composite material has a high sodium-ion transmission rate, and the external pseudocapacitance behavior can also significantly improve its electrochemical performance. This method provides a new idea for the development of advanced high-capacity anode materials for sodium-ion batteries.

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Ionic liquid assisted hydrothermal synthesis of MoS₂ double-shell polyhedral cages with enhanced catalytic hydrogenation activities

Cited by 15 publications

References 37 publications

Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

On the Tribological Properties of RGO–MoS2 Composites Surface Modified by Oleic Acid

Polypyrrole Modified MoS2 Nanorod Composites as Durable Pseudocapacitive Anode Materials for Sodium-Ion Batteries

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Ionic liquid assisted hydrothermal synthesis of MoS2 double-shell polyhedral cages with enhanced catalytic hydrogenation activities

Cited by 15 publications

References 37 publications

Quasi-Single-Layer MoS2 on MoS2/TiO2 Nanoparticles for Anthracene Hydrogenation

Quasi-Single-Layer MoS2 on MoS2/TiO2 Nanoparticles for Anthracene Hydrogenation

On the Tribological Properties of RGO–MoS2 Composites Surface Modified by Oleic Acid

Polypyrrole Modified MoS2 Nanorod Composites as Durable Pseudocapacitive Anode Materials for Sodium-Ion Batteries

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Ionic liquid assisted hydrothermal synthesis of MoS₂ double-shell polyhedral cages with enhanced catalytic hydrogenation activities

Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation