Carbon Energy
·
2024
·
IF 19.5
Xuewen Jiang,Qian Wang,Limeng Song,Hongxia Lu,Hongliang Xu,Gang Shao,Hailong Wang,Rui Zhang,Changan Wang,Bingbing Fan
Material composition and structural design are important factors influencing the electromagnetic wave (EMW) absorption performance of materials. To alleviate the impedance mismatch attributed to the high dielectric constant of Ti 3 C 2 T x MXene, we have successfully synthesized core-shell structured SiO 2 @MXene@MoS 2 nanospheres. This architecture, comprising SiO 2 as the core, MXene as the intermediate layer, and MoS 2 as the outer shell, is achieved through an electrostatic self-assembly method combined with a hydrothermal process. This complex core-shell structure not only provides a variety of loss mechanisms that effectively dissipate electromagnetic energy but also prevents self-aggregation of MXene and MoS 2 nanosheets. Notably, the synergistic combination of SiO 2 and MoS 2 with highly conductive MXene enables the suitable dielectric constant of the composites, ensuring optimal impedance matching. Therefore, the core-shell structured SiO 2 @MXene@MoS 2 nanospheres exhibit excellent EMW absorption performance, featuring a remarkable minimum reflection loss (RL min ) of −52.11 dB (2.4 mm). It is noteworthy that these nanospheres achieve an ultra-wide effective absorption bandwidth (EAB) of 6.72 GHz. This work provides a novel approach for designing and synthesizing high-performance EMW absorbers characterized by “wide bandwidth and strong reflection loss.”
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2022
·Vol. 9
·期 7
·2559-2571
·
IF 9.473
Meng Li,Mengwen Xu,Quanyu Shi,Haotian Wang,Hongmin Guo,Lidong Wang,Tony D. James
The shortage of freshwater resources caused by heavy metal pollution is an acute global issue. Herein, a novel nanoplatform was fabricated by hydrothermal deposition of 3D-MoS2 nanospheres onto biocompatible wood sponge (WS) for Hg(II) removal. Moreover, a secondary water purification strategy was investigated to produce drinkable water using the exhausted wood sponge. The exhausted MoS2-wood sponge (MWS) was used to construct a solar steam generator by wrapping with a hydrophilic polyvinyl alcohol (PVA) layer to prevent heavy metal ion leakage and to enhance the hydrophilicity. The energy conversion efficiency of the evaporator was calculated to be 95.48% under one sun illumination. Remarkably, the treatment of model desulphurization wastewater from power plants with this functional wood sponge could efficiently reduce the mercury concentration below the limit proposed by the World Health Organization for drinking water. These results provide a basis for the application of upcycled hazardous adsorbents for the purification of drinkable water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Peiyuan Mao,Yong Wang,Pandeng Xiao,Wen Zhang,Shun Rao,Zhi Wang
Herein, we demonstrate the reasonable design and preparation of yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres as anode materials in sodium-ion battery. Through an effective multi-step strategy, Sn nanoparticles are encapsulated in N-doped C nanocage surrounded by ultra-thin MoS 2 nanosheets to form Sn@N-doped C@MoS 2 nanospheres. In this novel structure, Sn nanoparticles with high theoretical capacity improve the space utilization inside the heteroshell; the N-doped carbon nanocage as the skeleton not only inhibits the mutual accumulation of Sn and MoS 2 , but also improves conductivity; the outer MoS 2 ultra-thin sheets can consolidate C@MoS 2 heteroshell, provide numerous active sites and favor the fast diffusion of Na + /e - . Notably, the combination of carbon nanocage and MoS 2 sheets in the yolk-heteroshell structure can effectually buffer the volume expansion of Sn nanoyolks and reinforce C@MoS 2 heteroshell while reducing the carbon content. Therefore, the yolk-heteroshell structure plays a crucial role in enhanced reversible capacity and cyclic stability of Sn@N-doped C@MoS 2 nanospheres, which activates their sodium storage potential. The yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres exhibit high reversible capacity of 488.4 mAh g −1 at 0.1 A g −1 after 300 cycles and long-cycle stability of 350.6 mAh g −1 at 0.5 A g −1 after 500 cycles. Moreover, their full cell delivers a stable reversible discharge capacity of about 80.1 mAh g −1 after 30 cycles at 0.5 C. This work provides a feasible yolk-heteroshell strategy for Sn-based composite nanomaterials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaoyan Wang,Ying Xie,Zhicheng Cai,Ni Xiong,Zhikun Xu,Mingxia Li,Qingmao Feng,Wei Zhou,Kai Pan
In this work, the sesame ball-like CoS/MoS 2 nanospheres were controllably synthesized via a facile hydrothermal and solvothermal consecutive reaction. MoS 2 nanospheres were preferentially formed by assembly of nanosheets during the hydrothermal reaction . And then CoS nanoparticles were grown on the surface of MoS 2 nanosheets during the solvothermal reaction method. Due to the space confinement effect, CoS grew as nanoparticles with size of 5 nm between MoS 2 nanosheets, and the nanosheets assembled into nanospheres to get the sesame ball-like structure. Because this composite possessed two merits, that is, more active sites of CoS nanoparticles and high conductivity of MoS 2 nanospheres, DSSCs based on this sesame ball-like CoS/MoS 2 nanospheres got a higher power conversion efficiency of 7.48%, which was higher than that based on the solo CoS (7.10%) and solo MoS 2 (4.84%). And it was similarly to the DSSCs based on Pt cathode (7.51%). Their excellent electrocatalytic activities for the I 3 − /I − redox reaction was confirmed by cyclic voltammetry , electrochemical impedance spectra and Tafel polarization measurements. Density functional theory was also used to calculate the adsorption of I 3 − on the surface of CoS/MoS 2 , and the adsorption energy and bond length results indicated Co atoms were the main catalytic active site for I 3 − reduction. The hybrid interactions took place between p orbital of I and 3d states of Co, which lead to I 3 − was activated and dissociated easily.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）