Synthesis and assembly of three-dimensional MoS2/rGO nanovesicles for high-performance lithium storage

Dong, Yuru; Jiang, Hao; Deng, Zongnan; Hu, Yanjie; Li, Chunzhong

doi:10.1016/j.cej.2018.06.044

Cited by 32 publications

(10 citation statements)

References 46 publications

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“…[ 16 ] Generally, MoS 2 anode materials should possess buffer spaces to accommodate the volume expansion after sodium‐ion (Na + ) insertion, such as vertical MoS 2 nanosheet arrays, [ 17 ] petal‐like MoS 2 nanosheets, [ 18 ] and 3D MoS 2 /reduced graphene oxide (rGO) nanovesicles. [ 19 ] Nanostructured active materials and moderate void content are critical structural design elements for high‐performance SIB anodes. Furthermore, the low electrical conductivity of MoS 2 can be improved via composite formation with a carbon material.…”

Section: Figurementioning

confidence: 99%

Toward Rapid‐Charging Sodium‐Ion Batteries using Hybrid‐Phase Molybdenum Sulfide Selenide‐Based Anodes

et al. 2020

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To attain both high energy density and power density in sodium‐ion (Na+) batteries, the reaction kinetics and structural stability of anodes should be improved by materials optimization. In this work, few‐layered molybdenum sulfide selenide (MoSSe) consisting of a mixture of 1T and 2H phases is designed to provide high ionic/electrical conductivities, low Na+ diffusion barrier, and stable Na+ storage. Reduced graphene oxide (rGO) is used as a conductive matrix to form 3D electron transfer paths. The resulting MoSSe@rGO anode exhibits high capacity and rate performance in both organic and solid‐state electrolytes. The ultrafast Na+ storage kinetics of the MoSSe@rGO anode is attributed to the surface‐dominant reaction process and broad Na+ channels. In situ and ex situ measurements are conducted to reveal the Na+ storage process in MoSSe@rGO. It is found that the MoS and MoSe bonds effectively limit the dissolution of the active materials. The favorable Na+ storage kinetics of the MoSSe@rGO electrode are ascribed to its low adsorption energy of −1.997 eV and low diffusion barrier of 0.087 eV. These results reveal that anion doping of metal sulfides is a feasible strategy to develop sodium‐ion batteries with high energy and power densities and long life‐span.

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Section: Figurementioning

confidence: 99%

Toward Rapid‐Charging Sodium‐Ion Batteries using Hybrid‐Phase Molybdenum Sulfide Selenide‐Based Anodes

et al. 2020

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“…(symbol E) [46], which suggests the existence of apical S-defects that can improve the electrocatalytic activity towards HER.…”

Section: Elemental Composition and Valence Statementioning

confidence: 99%

“…The S 2p spectrum was obtained using high-resolution XPS as shown in Figure 5b. The main doublet peaks at binding energies of 161.6 and 162.8 eV corresponded to the S 2p3/2 and S 2p1/2 of MoS2 (symbol D) [41,46], respectively. In addition, the weak peak at a binding energy of 165 eV corresponded to S2 2− 2p1/2 (symbol E) [47], which suggests the existence of apical S-defects that can improve the electrocatalytic activity towards HER.…”

Section: Elemental Composition and Valence Statementioning

confidence: 99%

MoS2-Carbon Inter-overlapped Structures as Effective Electrocatalysts for the Hydrogen Evolution Reaction

Huang

Brahma

et al. 2020

Nanomaterials

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The ability to generate hydrogen in an economic and sustainable manner is critical to the realization of a future hydrogen economy. Electrocatalytic water splitting into molecular hydrogen using the hydrogen evolution reaction (HER) provides a viable option for hydrogen generation. Consequently, advanced non-precious metal based electrocatalysts that promote HER and reduce the overpotential are being widely researched. Here, we report on the development of MoS2-carbon inter-overlapped structures and their applicability for enhancing electrocatalytic HER. These structures were synthesized by a facile hot-injection method using ammonium tetrathiomolybdate ((NH4)2MoS4) as the precursor and oleylamine (OLA) as the solvent, followed by a carbonization step. During the synthesis protocol, OLA not only plays the role of a reacting solvent but also acts as an intercalating agent which enlarges the interlayer spacing of MoS2 to form OLA-protected monolayer MoS2. After the carbonization step, the crystallinity improves substantially, and OLA can be completely converted into carbon, thus forming an inter-overlapped superstructure, as characterized in detail using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). A Tafel slope of 118 mV/dec is obtained for the monolayer MoS2-carbon superstructure, which shows a significant improvement, as compared to the 202 mV/dec observed for OLA-protected monolayer MoS2. The enhanced HER performance is attributed to the improved conductivity along the c-axis due to the presence of carbon and the abundance of active sites due to the interlayer expansion of the monolayer MoS2 by OLA.

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“…To tackle these challenges, it has been proven to be particularly effective by engineering various nanostructured MoS 2 and introducing the conductive carbonaceous materials [ 15 , 19 – 21 ]. The essence of the former is to shorten the electronic transmission distance, while the latter aims to improve the overall electronic conductivity of the material, restrain the agglomeration of MoS 2 and maintain the electrode structure stability, for example, MoS 2 /graphene [ 22 , 23 ], MoS 2 /CNTs [ 24 ], MoS 2 /carbon nanofibers [ 25 ], MoS 2 /RGO [ 26 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Porous MoS2/C Nanospheres Self-Assembled by Nanosheets with High Electrochemical Energy Storage Performance

2020

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To overcome the deficiency of the volume expansion of MoS2 as the anode material for lithium-ion batteries (LIBs), an effective strategy was developed to design hierarchical porous MoS2/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 MoS2/C nanosheets coated with carbon layer and possess an expanded interlayer spacing of 0.98 nm. As anodes for LIBs, MoS2/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 MoS2, 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 MoS2 in MoS2/C can decrease the ion diffusion resistance and alleviate the volumetric expansion during discharge/charge cycles.

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Synthesis and assembly of three-dimensional MoS2/rGO nanovesicles for high-performance lithium storage

Cited by 32 publications

References 46 publications

Toward Rapid‐Charging Sodium‐Ion Batteries using Hybrid‐Phase Molybdenum Sulfide Selenide‐Based Anodes

Toward Rapid‐Charging Sodium‐Ion Batteries using Hybrid‐Phase Molybdenum Sulfide Selenide‐Based Anodes

MoS2-Carbon Inter-overlapped Structures as Effective Electrocatalysts for the Hydrogen Evolution Reaction

Hierarchical Porous MoS2/C Nanospheres Self-Assembled by Nanosheets with High Electrochemical Energy Storage Performance

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