Extraordinary lithium storage capacity and lithiation mechanism of partially amorphous molybdenum sulfide on chemically exfoliated graphene

Ji, Seulgi; Kim, Seong K.; Song, Wooseok; Yoon, Yeoheung; Myung, Sung; Jung, Ha‐Kyun; Choi, Sungho; An, Ki‐Seok; Lee, Su Yeon

doi:10.1016/j.electacta.2020.136636

Cited by 11 publications

(6 citation statements)

References 52 publications

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“…In a recent report, an amorphous MoS x -reduced graphene oxide freestanding electrode was formed on nickel foam via dip coating and annealing at 280 °C for 30 min, resulting in a high specific capacity of ∼1700 mAh/g at 1 A/g and a Coulombic efficiency near 100% after 200 cycles. 31 A hierarchical MoS 2 /reduced graphene aerogel nanostructure was fabricated via solvothermal and freeze-drying processes with subsequent annealing at 700 °C to afford a binder-free anode with a specific capacity of 1041 mAh/g at 100 mA/g and a reversible capacity of 667 mAh/g with 58.6% capacity retention after 100 consecutive cycles. 26 A nanostructure of MoS 2 nanosheets and graphene obtained through the use of acidassisted hydrothermal methods with subsequent annealing at 800 °C under argon evinced a capacity of 1077 mAh/g at 100 mA/g after 150 cycles.…”

Section: ■ Introductionmentioning

confidence: 99%

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Lutz

Dunkin

King

et al. 2022

ACS Appl. Nano Mater.

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Modulation of electron/ion transport in electrodes through the appropriate mesoscale electrode structural design is essential to achieving effective utilization of nanoscale electroactive materials. Herein, nanosheet MoS2+x /carbon [one-dimensional (1D) carbon nanotube (CNT) or two-dimensional (2D) graphene nanoplatelet (GNP)] heterostructures are prepared via a simple, one-step hydrothermal method, resulting in high-loading (16.2–21.0 mg/cm2) binder-free three-dimensional (3D) porous electrodes. In lithium-based batteries, an anionic S2 2––S2– redox system is demonstrated based on combined structural characterization using X-ray photoelectron spectroscopy, Raman spectroscopy, and in situ synchrotron-based X-ray absorption spectroscopy to elucidate the electrochemical behavior of the Mo and S centers. MoS2+x -GNP electrodes delivered 177 mAh/g (2.9 mAh/cm2) in the first cycle and 78 mAh/g (1.3 mAh/cm2) after 100 cycles at a current of 3.2 mA/cm2, representing high capacities despite such a high material loading for a sulfur-equivalent system, with 44% capacity retention and good rate capability. Conversely, the MoS2+x -CNT heterostructure displayed lower capacity and more capacity fade at all rates, attributed to aggregation of the active and carbonaceous materials in these electrodes and poor access to MoS2+x edge sites, as visualized via 3D Raman mapping and electron microscopy. The significantly improved capacity retention of the MoS2+x -GNP system is attributed to the (i) morphology because the arrangement of the 2D MoS2+x nanosheets on the GNP substrate allows for edge sites with excess sulfur to be exposed, (ii) increased stability of the structure during cycling, and (iii) homogeneous dispersion of the active and carbonaceous materials, resulting in good electrical contact.

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Section: ■ Introductionmentioning

confidence: 99%

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Lutz

Dunkin

King

et al. 2022

ACS Appl. Nano Mater.

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“…Mo + 2Li 2 S), respectively. 17,31 The oxidation peaks of the initial cycle appeared at 1.9 and 2.3 V and are caused by the oxidation of molybdenum and delithiation of Li 2 S, respectively. The following cycles showed similar features for CV, indicating reversible lithiation/delithiation behavior of Mo 3 S 13 -PAA-IPA.…”

Section: Resultsmentioning

confidence: 99%

“…[14][15][16] The stability of MoS x could be improved through the formation of a composite with carbon materials. 16,17 However, it remains a serious problem that the utilization of carbon supports should sacrifice the energy density of the MoS xbased electrode.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, when amorphous MoS x was applied as an anode material, the electrode showed serious degradation within a few cycles owing to large volume changes and polysulfide dissolution despite a remarkable initial capacity 14‐16 . The stability of MoS x could be improved through the formation of a composite with carbon materials 16,17 . However, it remains a serious problem that the utilization of carbon supports should sacrifice the energy density of the MoS x ‐based electrode.…”

Section: Introductionmentioning

confidence: 99%

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Effect of poly(acrylic acid) binder on the stability of sulfur‐enriched crystalline Mo ₃ S ₁₃ clusters for high capacity of Li‐ion batteries

Lee

Park

et al. 2022

Intl J of Energy Research

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Summary Molybdenum sulfide (MoSx)‐based materials have been extensively studied as a potential alternative of low‐capacity graphite anode, owing to their remarkable capacity through intercalation and conversion reactions. However, these materials should be electrochemically activated at a low potential in first discharge and simultaneously degrade, owing to their inert basal plane and unstable sulfur configuration, respectively, leading to unexpectedly low performance. Hence, it is necessary to apply sulfur‐enriched crystalline Mo3S13 clusters as an anode material to increase the number of active sites and energy densities. Unlike MoS2 possessing only terminal sulfur, Mo3S13 clusters have higher sulfur content with various and stable configuration in their structure, which can act as additional active sulfur sites. To realize an electrode with high energy density, we used the Mo3S13 clusters without any carbon supports as active materials. In the electrode preparation, we confirmed that employing poly(acrylic acid) and isopropyl alcohol as a binder and solvent, respectively, was appropriate for retaining the cluster crystallinity, resulting in the enhanced cycling stability. The Mo3S13 cluster‐based electrode as a carbon‐free electrode exhibited capacity of 1192 mAh g−1 at 0.1 A g−1 and good C‐rate capability. The significant capacity variation with the selective removal of sulfur configuration in Mo3S13 clusters indicates that the increased sulfur contents were provided as additional sources for (de)lithiation.

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“…Interestingly, amorphous molybdenum sulfide (a-MoS x ), a family member of transition-metal chalcogenides materials, has become a rising star in the pursuit of highly efficient energy harvesting and conversion 19,[26][27][28][29][30][31][32] . Attributing to the unique two-dimensional networks or unfolded one-dimensional chains structure of a-MoS x which is bridged by disulfide ligands, abundant surface reaction sites could contact actively and closely with the surrounding environment, demonstrating brilliant reaction activities and efficient charge separation and transport 19,[26][27][28]33,34 .…”

Section: Introductionmentioning

confidence: 99%

Observation of polarity-switchable photoconductivity in III-nitride/MoSx core-shell nanowires

Wang

Fang

et al. 2022

Light Sci Appl

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III–V semiconductor nanowires are indispensable building blocks for nanoscale electronic and optoelectronic devices. However, solely relying on their intrinsic physical and material properties sometimes limits device functionalities to meet the increasing demands in versatile and complex electronic world. By leveraging the distinctive nature of the one-dimensional geometry and large surface-to-volume ratio of the nanowires, new properties can be attained through monolithic integration of conventional nanowires with other easy-synthesized functional materials. Herein, we combine high-crystal-quality III-nitride nanowires with amorphous molybdenum sulfides (a-MoSx) to construct III-nitride/a-MoSx core-shell nanostructures. Upon light illumination, such nanostructures exhibit striking spectrally distinctive photodetection characteristic in photoelectrochemical environment, demonstrating a negative photoresponsivity of −100.42 mA W−1 under 254 nm illumination, and a positive photoresponsivity of 29.5 mA W−1 under 365 nm illumination. Density functional theory calculations reveal that the successful surface modification of the nanowires via a-MoSx decoration accelerates the reaction process at the electrolyte/nanowire interface, leading to the generation of opposite photocurrent signals under different photon illumination. Most importantly, such polarity-switchable photoconductivity can be further tuned for multiple wavelength bands photodetection by simply adjusting the surrounding environment and/or tailoring the nanowire composition, showing great promise to build light-wavelength controllable sensing devices in the future.

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Extraordinary lithium storage capacity and lithiation mechanism of partially amorphous molybdenum sulfide on chemically exfoliated graphene

Cited by 11 publications

References 52 publications

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Effect of poly(acrylic acid) binder on the stability of sulfur‐enriched crystalline Mo ₃ S ₁₃ clusters for high capacity of Li‐ion batteries

Observation of polarity-switchable photoconductivity in III-nitride/MoSx core-shell nanowires

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Extraordinary lithium storage capacity and lithiation mechanism of partially amorphous molybdenum sulfide on chemically exfoliated graphene

Cited by 11 publications

References 52 publications

Hybrid MoS2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Hybrid MoS2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Effect of poly(acrylic acid) binder on the stability of sulfur‐enriched crystalline Mo 3 S 13 clusters for high capacity of Li‐ion batteries

Observation of polarity-switchable photoconductivity in III-nitride/MoSx core-shell nanowires

Contact Info

Product

Resources

About

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Hybrid MoS_2+x Nanosheet/Nanocarbon Heterostructures for Lithium-Ion Batteries

Effect of poly(acrylic acid) binder on the stability of sulfur‐enriched crystalline Mo ₃ S ₁₃ clusters for high capacity of Li‐ion batteries