Fe3O4@Carbon Nanosheets for All-Solid-State Supercapacitor Electrodes

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• 作者：Huailin Fan ; Ruiting Niu ; Jiaqi Duan ; Wei Liu ; Wenzhong Shen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：8
• 期：30
• 页码：19475-19483
• 全文大小：657K
• 年卷期：0
• ISSN：1944-8252

文摘

Fe₃O₄@carbon nanosheet composites were synthesized using ammonium ferric citrate as the Fe₃O₄/carbon precursor and graphene oxide as the structure-directing agent under a hydrothermal process. The surface chemical compositions, pore structures, and morphology of the composite were analyzed and characterized by nitrogen adsorption isotherms, TG analysis, FT-IR, X-ray photoelectron energy spectrum, transmission electron microscopy, and scanning electron microscopy. The composites showed excellent specific capacitance of 586 F/g, 340 F/g at 0.5 A/g and 10 A/g. The all-solid-state asymmetric supercapacitor device assembled using carbon nanosheets in situ embedded Fe₃O₄ composite and porous carbon showed a largest energy density of 18.3 Wh/kg at power density of 351 W/kg in KOH/PVA gel electrolyte. The synergism of high special surface to volume ratio, mesoporous structure, graphene-based conduction paths, and Fe₃O₄ nanoparticles provided a high surface area of ion-accessibility, high electric conductivity, and the utmost utilization of Fe₃O₄ and resulted in excellent specific capacitance, outstanding rate capability and cycling life as all-solid-state supercapacitor electrodes.