Confinement effect of monolayer MoS<sub>2</sub> quantum dots on conjugated polyimide and promotion of solar-driven photocatalytic hydrogen generation

Ma, Chenghai; Zhu, Haoyue; Zhou, Jun; Cui, Zhiwei; Li, Teng; Wang, Yicong; Zou, Zhigang

doi:10.1039/c6dt04916h

Cited by 77 publications

(31 citation statements)

References 71 publications

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“…In particular, most of the research works have been carried out using powder photocatalysts (except photo-electrochemical studies). The reported materials in the recent years are categorized as oxide , carbon [3,81,, and sulfide [3,14,17,35,58,59,113,114,119,128,133,154,164,169,177,181,195,203,208,210,215,220,227,230,235, photocatalysts. Titanium oxide-P25 (TiO2-P25), graphitic carbon nitride (g-C3N4), and cadmium sulfide (CdS) are the most extensively studied photocatalysts for water splitting.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

et al. 2019

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Photocatalytic water splitting is a sustainable technology for the production of clean fuel in terms of hydrogen (H2). In the present study, hydrogen (H2) production efficiency of three promising photocatalysts (titania (TiO2-P25), graphitic carbon nitride (g-C3N4), and cadmium sulfide (CdS)) was evaluated in detail using various sacrificial agents. The effect of most commonly used sacrificial agents in the recent years, such as methanol, ethanol, isopropanol, ethylene glycol, glycerol, lactic acid, glucose, sodium sulfide, sodium sulfite, sodium sulfide/sodium sulfite mixture, and triethanolamine, were evaluated on TiO2-P25, g-C3N4, and CdS. H2 production experiments were carried out under simulated solar light irradiation in an immersion type photo-reactor. All the experiments were performed without any noble metal co-catalyst. Moreover, photolysis experiments were executed to study the H2 generation in the absence of a catalyst. The results were discussed specifically in terms of chemical reactions, pH of the reaction medium, hydroxyl groups, alpha hydrogen, and carbon chain length of sacrificial agents. The results revealed that glucose and glycerol are the most suitable sacrificial agents for an oxide photocatalyst. Triethanolamine is the ideal sacrificial agent for carbon and sulfide photocatalyst. A remarkable amount of H2 was produced from the photolysis of sodium sulfide and sodium sulfide/sodium sulfite mixture without any photocatalyst. The findings of this study would be highly beneficial for the selection of sacrificial agents for a particular photocatalyst.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

et al. 2019

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“…Meantime, the high edge‐density and surface exposure indeed contribute abundant pseudocapacitance . However, it is very difficult to achieve such monolayer MoS 2 nanocrystals because the high surface energy and the strong interlayer van der Walls force can easily bring about coalescence and non‐redispersion . Surface coupling of highly conductive substrates such as graphene with few‐layered MoS 2 nanosheets can not only effectively solve these problems, but also accelerate the electron transfer during the electrochemical reaction with boosted charge/discharge capability and cycling stability .…”

Section: Introductionmentioning

confidence: 99%

2D Nanospace Confined Synthesis of Pseudocapacitance‐Dominated MoS₂‐in‐Ti₃C₂ Superstructure for Ultrafast and Stable Li/Na‐Ion Batteries

Jiang

et al. 2018

Adv Funct Materials

211

147

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Exploring a universal strategy to implement the precise control of 2D nanomaterials in size and layer number is a big challenge for achieving ultrafast and stable Li/Na-ion batteries. Herein, the confined synthesis of 1-3 layered MoS 2 nanocrystals into 2D Ti 3 C 2 interlayer nanospace with the help of electrostatic attraction and subsequent cetyltrimethyl ammonium bromide (CTAB) directed growth is reported. The MoS 2 nanocrystals are tightly anchored into the interlayer by 2D confinement effect and strong MoC covalent bond. Impressively, the disappearance of Li + intercalated into MoS 2 reduction peak is successfully observed for the first time in the experiment, showing in a typical surface-controlled charge storage behavior. The pseudocapacitance-dominated contribution guarantees a much faster and more stable Li/Na storage performance. As predicted, this electrode exhibits a very high Li + storage capacity of 340 mAh g −1 even at 20 A g −1 and a long cycle life (>1000 times). It also shows an excellent Na + storage capacity of 310 mAh g −1 at 1 A g −1 with a 1600 times high-rate cycling. Such impressive confined synthesis strategy can be extended to the precise control of other 2D nanomaterials.

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“…Clearly, that the CDs with lattice spacing of 0.24 nm are evenly distributed on the surface of a single MoS 2 layer. The lattice spacing of MoS 2 shows two distinct spacing (0.27 and 0.17 nm), which corresponds to the (100) and (110) planes of MoS 2 by the HR‐TEM measurement (Figure H) …”

Section: Resultsmentioning

confidence: 90%

In‐situ formation and intercalation of carbon dots induced high‐yield 1T‐molybdenum disulfide as electrode materials

et al. 2019

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Herein, carbon dots/octahedral molybdenum disulfide hybrids (CDs@1T-MoS 2 ) were successfully fabricated via a facile hydrothermal method by the induction of carbon dots. In this method, CDs as a core in this system were first synthesized via hydrothermal method of citric acid (CA). Their morphology and properties were analyzed using X-Ray diffraction (XRD), Raman spectroscopy, Xray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) measurements. Results indicated that the high yield (about 78%) and ultrathin sheets octahedral 1T-MoS 2 were obtained by introducing CDs fabricated by hydrothermal CA. Importantly, this work effectively solves the aggregation of nonsubstituted MoS 2 sheets via in-situ formation, intercalation and exfoliation of CDs and achieves MoS 2 sheet-based electrode materials with big specific surface area and high specific capacitance as well as good rate capability and excellent cycling stability. Among binary CDs@1T-MoS 2 hybrids, the S4 hybrid especially exhibits the highest specific capacitance of 380 F/g at a current density of 0.5 A/g and the best cycle stability with keeping 97% after 2000 charge-discharge cycles. The outstanding performances of the CDs@1T-MoS 2 hybrids were mainly attributed to the awesome synergistic effects between CDs and 1T-MoS 2 . And these multifunctional CDs@1T-MoS 2 hybrids have great potential applications in supercapacitance electrode material, microwave adsorption, and catalytic degradation. K E Y W O R D S carbon dots (CDs), electrochemical performances, hydrothermal method, octahedral molybdenum disulfide (1T-MoS 2 )

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Confinement effect of monolayer MoS₂ quantum dots on conjugated polyimide and promotion of solar-driven photocatalytic hydrogen generation

Cited by 77 publications

References 71 publications

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

2D Nanospace Confined Synthesis of Pseudocapacitance‐Dominated MoS₂‐in‐Ti₃C₂ Superstructure for Ultrafast and Stable Li/Na‐Ion Batteries

In‐situ formation and intercalation of carbon dots induced high‐yield 1T‐molybdenum disulfide as electrode materials

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Confinement effect of monolayer MoS2 quantum dots on conjugated polyimide and promotion of solar-driven photocatalytic hydrogen generation

Cited by 77 publications

References 71 publications

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

Photocatalytic Hydrogen Production: Role of Sacrificial Reagents on the Activity of Oxide, Carbon, and Sulfide Catalysts

2D Nanospace Confined Synthesis of Pseudocapacitance‐Dominated MoS2‐in‐Ti3C2 Superstructure for Ultrafast and Stable Li/Na‐Ion Batteries

In‐situ formation and intercalation of carbon dots induced high‐yield 1T‐molybdenum disulfide as electrode materials

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Confinement effect of monolayer MoS₂ quantum dots on conjugated polyimide and promotion of solar-driven photocatalytic hydrogen generation

2D Nanospace Confined Synthesis of Pseudocapacitance‐Dominated MoS₂‐in‐Ti₃C₂ Superstructure for Ultrafast and Stable Li/Na‐Ion Batteries