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Vertically-grown few-layer MoS2 nanosheets on hierarchical carbon nanocages for pseudocapacitive lithium storage with ultrahigh-rate capability and long-term recyclability
摘要： Molybdenum disulfide (MoS2) are intensively studied anode materials for lithium-ion batteries (LIBs) owing to the high theoretical capacity, but still confront the severe challenges of unsatisfied rate capability and cycle life to date. Herein, few-layer MoS2 nanosheets are vertically grown on the hierarchical carbon nanocages (hCNC) via a facile hydrothermal method, which introduce pseudocapacitive lithium storage owing to the highly-exposed MoS2 basal planes, enhanced conductivity and facilitated electrolyte access arising from the well hybridization with hCNC. As a result, the optimized MoS2/hCNC exhibits the reversible capacity of 1670 mAh g-1 at 0.1 A g-1 after 50 cycles, 621 mAh g-1 at 5.0 A g-1 after 500 cycles, and 196 mAh g-1 at 50 A g-1 after 2,500 cycles, staying at the top level of the MoS2-based anode materials. The specific power and specific energy can reach to 16.1 kW kg-1 electrode and 252.8 Wh kg-1 electrode after 3,000 cycles, respectively, showing the great potential in high-power and long-life LIBs. This finding suggests a promising strategy for exploring advanced anode materials with high reversible capacity, high-rate capability and long-term recyclability.
关键词： pseudocapacitive lithium storage,vertical few-layer MoS2,hierarchical carbon nanocages,long-term recyclability,ultrahigh-rate capability
更新于2025-09-23 15:23:52
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Controlled Growth of Vertically Oriented Trilayer MoS <sub/>2</sub> Nanoflakes for Rooma??Temperature NO <sub/>2</sub> Gas Sensor Applications
摘要： In present work, we introduce the controlled synthesis of few layer vertically oriented MoS2 flakes for high performance NO2 gas sensor applications. The density and the thickness of MoS2 nanosheets are controlled by varying the heating rate of the chemical vapor deposition process. Our study confirms that the nanoflakes of about three layers were obtained under the heating rate of 5 oC by using powders of MoO3 and S as precursors without using any catalyst. This is very advantageous because no catalyst was used, there was no need of buffer layer at the bottom of the MoS2 thin film flacks, thus omitting the leakage current when measuring the electrical signal and enhancing the gas sensing performance. Gas sensing measurements demonstrated that the interconnected vertically oriented MoS2 nanoflakes have a good response value of 20.1% to 0.5 ppm NO2 at RT, and 1.73% at 150 oC. The sensor showed full recovery characteristic at a measured temperature of 150 oC with response and recovery time of about 15 s, and 100 s, respectively. The sensor also exhibited good selectivity with the ignorable response to SO2, H2, NH3, H2S and a low detection limit of 42 ppb.
关键词： Few-layer MoS2,Gas sensors,Chemical vapor deposition,Vertically oriented
更新于2025-09-23 15:19:57