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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Facile fabrication and electrochemical performance of flower-like Fe3O4@C@layered double hydroxide (LDH) composite
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Facile fabrication and electrochemical performance of flower-like Fe3O4@C@layered double hydroxide (LDH) composite

机译：花状Fe3O4 @ C @层状双氢氧化物（LDH）复合材料的制备及电化学性能

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摘要

A novel core-shell structured Fe3O4@C@iNi-Al LDH composite containing a carbon-coated Fe3O4 magnetic core and a layered double hydroxide (LDH) has been successfully prepared by a combination of the hydrothermal method and a facile in situ growth process. The Fe3O4@C@Ni-Al LDH microspheres were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transformed infrared (FT-IR), X-ray photoelectron spectra (XPS), and N2 adsorption/desorption methods. Owing to the unique layered feature, the composite displays core-shell structure with flower-like morphology, ultra-high surface area (792 m~2 g~(-1)) and specific pore size distribution. Moreover, the as-synthesized Fe3O4@C@Ni-Al LDH microsphere as an electrode material was fabricated into a supercapacitor and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements. It turned out that the Fe3O4@C@Ni-Al LDH exhibits specific capacitance of 767.6 F g~(-1), good rate capability, and remarkable cycling stability (92% after 1000 cycling). Therefore, such a novel synthetic route to assemble the high-performance electrochemical capacitor may open a new strategy to prepare other materials with largely enhanced electrochemical properties, which can be of great promise in energy storage device applications.
机译：结合水热法和简便的原位生长过程，成功地制备了一种新型的核壳结构的Fe3O4 @ C @ iNi-Al LDH复合材料，该复合材料包含碳包覆的Fe3O4磁性核和层状双氢氧化物（LDH）。 Fe3O4 @ C @ Ni-Al LDH微球的特征在于X射线衍射（XRD），扫描和透射电子显微镜（SEM和TEM），高分辨率透射电子显微镜（HRTEM），傅立叶变换红外（FT-IR） ，X射线光电子能谱（XPS）和N2吸附/解吸方法。由于具有独特的分层特性，该复合材料显示出具有花状形态，超高表面积（792 m〜2 g〜（-1））和特定孔径分布的核-壳结构。此外，将合成后的Fe3O4 @ C @ Ni-Al LDH微球作为电极材料制成了超级电容器，并通过循环伏安法（CV），电化学阻抗谱（EIS）和恒电流充放电测量对其进行了表征。结果表明，Fe3O4 @ C @ Ni-Al LDH的比电容为767.6 F g〜（-1），具有良好的倍率性能和出色的循环稳定性（1000次循环后为92％）。因此，这种新颖的合成高性能电化学电容器的合成途径可以为制备具有大大增强的电化学性能的其他材料开启新的策略，这在储能装置的应用中具有很大的希望。

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