Journal of Energy Storage
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2023
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IF 9.4
Xianping Du,Ying Huang,Zhenhe Feng,Jiaming Wang,Xu Sun
Silicon-based (Si-based) materials have been highlighted for their high specific capacity and abundant reserves. However, the limited electrical conductivity and the large volume expansion are critical barriers to their extensive application. The most targeted remedy is the incorporation of selected conductive materials and the tailored design of electrode structures . Herein, carbon-MXene (C-MXene) and poly(3,4-ethylenedioxythiophene) (PEDOT) were employed to decorate Si cores to obtain Si-x@C-MXene@PEDOT particles. Among them, the content of Si was regulated for an optimal electrochemical performance. More significantly, given that the common single-layer core-shell structure was inherently inadequate in resisting the volume change, the core-bishell structure offered a robust buffer layer that consisted of a hard inorganic C-MXene and an organic PEDOT coating with an elastic conductive network, which collaboratively addressed the volume expansion issue. The resulting Si-2@C-MXene@PEDOT also possessed an excellent conductivity-promoting layer consisting of C-MXene and PEDOT, which facilitated the rapid transport of electrons, thus significantly boosting the electrochemical performance of the final electrodes. Also, the core-bishell structure assisted in the formation of a thinner solid electrolyte interface (SEI) film, which avoided the massive consumption of Li + and enhanced the lithium storage capability. This work was expected to open up possibilities for larger-scale applications of Si-based materials.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2024
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IF 5.5
Lidong Jiao,Mingshu Zhao,Zhou Su,Mangmang Shi,Min Li,Feng Li
Supercapacitors have received widespread attention from scientific researchers due to the advantages of high power density, fast charging/discharging rate and long cycle life. Among them, the development of high performance and high safety electrode materials are important research topics in the field of supercapacitors. Herein, zeolitic imidazolate framework (ZIF) derivatives is a good candidate material for supercapacitors electrode because of its controllable pore rate, constant cavity and larger specific area. However, the reunion phenomenon and the damaged structure during the reaction seriously affected its electrochemical properties, especially its stability. To solve this problem, the few-layer MXene was added into ZIF-67 to inhibit the reunion of single materials and the carbonization process was operated to improve its conductivity and structure stability. In addition, the CoNi 2 S 4 /carbon/MXene (CNS/C/MXene) obtained by the solvent thermal method successfully inherited the hollow cages structure and rough surface from the precursor, expressing a better electrochemical performance. In three-electrode system, the CNS/C/MXene electrode can exhibit the specific capacitance of 1221.6 F g −1 (169.7 mAh g −1 ) at 1 A g −1 and still maintain a high capacitance of 966.4 F g −1 (134.2 mAh g −1 ) at 20 A g −1 (79.1 % of the former). After assembling it with activated carbon into asymmetric supercapacitor, the device can provide a high energy density of 19.82 Wh kg −1 at a power density of 469.31 W kg −1 and maintain about 71.17 % of the initial capacitance after 30,000 cycles under a current density of 20 A g −1 , representing excellent cycle stability and rate capability.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
Matter
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2025
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IF 17.5
Ziyan Han,Xiankai Fan,Luxiao Zhang,Kun Wang,Jie Wang,Hao Li,Guangmei Jiang,Wenhui Li,Lipeng Wang,Yuzhu Ma,Kun Lan,Bing Ma,Wei Zhang,Yujuan Zhao,Jun Li,Wei Li,Dongliang Chao,Dongyuan Zhao,Zaiwang Zhao
Constructing two-dimensional (2D) porous heterogeneous superstructures with a high surface pore curvature at the mesoscopic scale remains a major challenge in materials science. Herein, we report a stable-monomicelle-assisted interface assembly method to prepare unique 2D hierarchical mesoporous heterogeneous carbon/MXene nanosheets with mesoscopic high surface pore curvature. In this hierarchical structure, MXene sheet is located at the center of the sandwich structure, and an ultrathin monolayer of uniform spherical mesopores is regularly arranged on both sides of the MXene nanosheets. Importantly, this interconnected 2D porous heterogeneous nanosheet endows a high surface pore curvature and abundant accessible surface area. In addition, the size of mesopores and the thickness of carbon layers are precisely controllable. Finally, we demonstrate that the 2D mesoporous heterogeneous carbon superstructure, which features channels for accelerated zinc-ion transport, exhibits a specific capacity of up to 158 mAh g −1 and improved rate performance.
研究领域:
材料科学
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纳米技术
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电化学能源
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产品关联
DOI
高影响因子
Applied Materials Today
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2025
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IF 6.9
Yashan Huo,Lei Zhang,Yujia Tan,Yang Liu,Mingjuan Wang,Minshan Zhao,Siyuan Huo,Peng Gao,Qi Jin,Zhihui He
Designing lightweight microwave absorbers that simultaneously achieve strong attenuation and broad bandwidth remains a major challenge. Here, we report a multidimensional CoS 2 /C/MXene heterostructure constructed through electrospinning and in-situ sulfidation, which integrates 0D CoS 2 nanoparticles, 2D MXene nanosheets, and a 1D conductive carbon-fiber network. This architecture generates abundant heterogeneous interfaces and continuous electron pathways, enabling synergistic magnetic-dielectric coupling and optimized impedance matching. The resulting composite achieves a minimum reflection loss of ‒70.86 dB at 10.6 GHz and an effective absorption bandwidth of 4.64 GHz at a low filler loading of 3 wt%. DFT calculations reveal significant interfacial charge transfer and built-in electric field formation, corroborating the enhanced polarization and conduction losses. Moreover, the composite exhibits excellent thermal stability, corrosion resistance, and mechanical flexibility. This work demonstrates an efficient strategy for constructing high-performance, low-density microwave absorbers through multidimensional heterostructure engineering.
✓ 已验证
产品关联
DOI
高影响因子
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