Fe3O4-based core/shell nanocomposites for high-performance electrochemical supercapacitors
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In this work, magnetite (Fe3O4)-based core/shell composites, including Fe3O4@carbon (C), Fe3O4@polyaniline (PANI), and Fe3O4@C@PANI, are synthesized via a facile hydrothermal process. The as-prepared core/shell composites are characterized by transmission electron microscopy, X-ray diffraction powder, and Fourier transform infrared spectroscopy. The electrochemical performances of Fe3O4, Fe3O4@C, Fe3O4@PANI, and Fe3O4@C@PANI are investigated using cyclic voltammetry, galvanostatic charge–discharge measurement, and electrochemical impedance spectroscopy. The results show that the as-prepared nanomaterials are all typical pseudocapacitance capacitors. Carbon shell can significantly increase the electronic conductivity of electrode materials, reduce capacity loss, and improve the reversibility of Fe3O4. PANI coating layer can expressively enhance the specific capacitance. Synergistic effect of double shells improves the electrochemical property of Fe3O4. Fe3O4@C@PANI composites display the high capacitance of 322.5 F g−1 at 2.5 A g−1, and 87.8 % of which can still be maintained after 3000 charge–discharge cycles. The excellent electrochemical properties of Fe3O4@C@PANI evidence their potential application as supercapacitors in energy storage field.
KeywordsFe3O4 PANI Specific Capacitance Ultrasonic Irradiation High Specific Capacitance
This work was financially supported by the National Natural Science Foundation of China (Grant No. 21273195), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Natural Science Foundation of Education Committee of Jiangsu Province (12KJB150023). The work was also sponsored by Qing Lan Project of Higher Learning Institutions in Jiangsu Province, the support of high-end talent plan of Yangzhou university, and Jiangsu Key Laboratory of Environmental Material and Environmental Engineering (K11032, K13062). The authors also acknowledge the Testing Center of Yangzhou University for TEM, XRD, and EDX experiments.
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