Stable performance of Li-S battery: Engineering of Li2S smart cathode by reduction of multilayer graphene-embedded 2D-MoS2

Han, Joong-Hee; Jang, Hyungil; Bui, Hoa Thi; Jahn, Marcus; Ahn, Docheon; Cho, Keumnam; Jun, Byeongsun; Lee, Sang Uck; Schwarz, Sabine; Stöger‐Pollach, Michael; Whitmore, Karin; Sung, Myung Mo; Kutwade, Vishnu V.; Sharma, Ramphal; Han, Sang Woo

doi:10.1016/j.jallcom.2020.158031

Cited by 12 publications

(6 citation statements)

References 57 publications

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“…The observed shift indicates that the interlayer spacing of the MoSe 2 sample has been expanded, which may have been caused by the incorporation of DEG solvent molecules into the MoSe 2 layers. [ 28 , 47 ]. In addition, the XRD pattern of the MoSe 2 sample presents the presence of two peaks at 23.42° and 28.70°, which correspond to the diffraction from (110) and (130) planes of MoO 3 (JCPDS #05-0508).…”

Section: Resultsmentioning

confidence: 99%

“…Transition metal dichalcogenides (TMDs) such as sulfide, selenide, and telluride of molybdenum and tungsten with layered structures have been paid considerable attention in various fields, including catalysts, energy storage, transistors, and photoelectrochemical devices [ 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. The unique two-dimensional (2D) architecture with excellent electrical properties and good catalytic activity offers TMDs as promising candidates for HER electrocatalysts [ 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization

et al. 2023

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Developing highly efficient and durable hydrogen evolution reaction (HER) electrocatalysts is crucial for addressing the energy and environmental challenges. Among the 2D-layered chalcogenides, MoSe2 possesses superior features for HER catalysis. The van der Waals attractions and high surface energy, however, stack the MoSe2 layers, resulting in a loss of edge active catalytic sites. In addition, MoSe2 suffers from low intrinsic conductivity and weak electrical contact with active sites. To overcome the issues, this work presents a novel approach, wherein the in situ incorporated diethylene glycol solvent into the interlayers of MoSe2 during synthesis when treated thermally in an inert atmosphere at 600 °C transformed into graphene (Gr). This widened the interlayer spacing of MoSe2, thereby exposing more HER active edge sites with high conductivity offered by the incorporated Gr. The resulting MoSe2-Gr composite exhibited a significantly enhanced HER catalytic activity compared to the pristine MoSe2 in an acidic medium and demonstrated a superior HER catalytic activity compared to the state-of-the-art Pt/C catalyst, particularly at a high current density beyond ca. 55 mA cm−2. Additionally, the MoSe2-Gr catalyst demonstrated long-term electrochemical stability during HER. This work, thus, presents a facile and novel approach for obtaining an efficient MoSe2 electrocatalyst applicable in green hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization

et al. 2023

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“…The GITT was further adopted to monitor the Li + transport behavior, which is a key descriptor affecting the liquid–solid conversion kinetics 45,46 . As seen in Figure 2E, the discharge curves of the Li–S batteries with CNTs‐S/Gh‐Tb 3+/4+ cathode under the GITT mode show much longer second platform and smaller potential fluctuation, especially in region III (~2.1 V) relating to the conversion from soluble LiPSs to solid Li 2 S 2 /Li 2 S, during the discharge process compared with other three cathodes.…”

Section: Resultsmentioning

confidence: 99%

“…The GITT was further adopted to monitor the Li + transport behavior, which is a key descriptor affecting the liquid-solid conversion kinetics. 45,46 As seen in Figure 2E, the discharge curves of the Li-S batteries with CNTs-S/ Gh-Tb 3+/4+ cathode under the GITT mode show much longer second platform and smaller potential fluctuation, especially in region III (~2.1 V) relating to the conversion from soluble LiPSs to solid Li 2 S 2 /Li 2 S, during the discharge process compared with other three cathodes. For the GITT profiles during charge, a large potential fluctuation is observed at the initial solid-solid conversion process (from Li 2 S to Li 2 S 2 ) with slow kinetics at all cathodes, but it decreases the most at CNTs-S/Gh-Tb 3+/4+ cathode due to solid-liquid conversion and keeps at a small overpotential in liquid-liquid conversion.…”

Section: Chemical Adsorption and Lips Conversion Kinetics With Tb Ele...mentioning

confidence: 91%

Regulating f orbital of Tb electronic reservoir to activate stepwise and dual‐directional sulfur conversion reaction

Yang

Cai

et al. 2022

InfoMat

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The sluggish kinetics in multistep sulfur redox reaction with different energy requirements for each step, is considered as the crucial handicap of lithium–sulfur (Li–S) batteries. Designing an electron reservoir, which can dynamically release electron to/accept electron from sulfur species during discharge/charge, is the ideal strategy for realizing stepwise and dual‐directional polysulfide electrocatalysis. Herein, a single Tb3+/4+ oxide with moderate unfilled f orbital is synthetized as an electron reservoir to optimize polysulfide adsorption via Tb–S and N···Li bonds, reduce activation energy barrier, expedite electron/Li+ transport, and selectively catalyze both long‐chain and short‐chain polysulfide conversions during charge and discharge. As a result, Tb electron reservoir enables stable operation of low‐capacity decay (0.087% over 500 cycles at 1 C), high sulfur loading (5.2 mg cm−2) and electrolyte‐starved (7.5 μL mg−1) Li–S batteries. This work could unlock the potential of f orbital engineering for high‐energy battery systems.

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“…Single layers of MoS 2 are normally 6.5 Å thick, [ 92 ] and scotch tape or lithium‐based intercalation can be applied to extract MoS 2 thin films. [ 93–94 ] Besides, Single‐layer MoS 2 presents a large intrinsic bandgap of 1.8 eV as presented in Figure 10b. The bandgap diagram of monolayer and bulk MoS 2 appear to be quite different and the bandgap of monolayer is direct bandgap of 1.8 eV.…”

Section: D Thermoelectric Materialsmentioning

confidence: 99%

2D Materials for Photothermoelectric Detectors: Mechanisms, Materials, and Devices

Dai,

Zhang,

Wang

2024

Adv Funct Materials

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Abstract2D materials, with outstanding optical, thermal, and electric properties, are emerging as promising candidates for fabricating high‐performance photodetectors. Recently, impressive progresses have been made in this area and some challenges are remaining to improve the properties of photodetectors. As one important part in the mainstream photodetection mechanisms, photothermoelectric (PTE) effect is showing unique priorities in fabricating advanced photodetectors, especially broadband detection operating in the mid‐infrared and terahertz spectral regime. Here, recent progress on PTE photodetectors based on layered 2D materials is reviewed. The physical mechanism of PTE effect is first discussed and then the optical and thermoelectric properties of various 2D materials are analyzed. Furthermore, strategies to improve the photodetection performance of PTE detectors are summarized in two major categories including enhanced photothermal conversion and thermoelectric conversion processes. Finally, the challenges and prospects for future research in 2D thermoelectric materials and PTE detectors are also provided.

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Stable performance of Li-S battery: Engineering of Li2S smart cathode by reduction of multilayer graphene-embedded 2D-MoS2

Cited by 12 publications

References 57 publications

Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization

Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization

Regulating f orbital of Tb electronic reservoir to activate stepwise and dual‐directional sulfur conversion reaction

2D Materials for Photothermoelectric Detectors: Mechanisms, Materials, and Devices

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