Hierarchical 3D Cobalt‐Doped Fe3O4 Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors |
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Authors: | Meng Guo Jayaraman Balamurugan Xuyang Li Nam Hoon Kim Joong Hee Lee |
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Affiliation: | 1. Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global) & Department of BIN Convergence Technology, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea;2. Carbon Composite Research Centre, Department of Polymer – Nano Science and Technology, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea |
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Abstract: | Hierarchical nanostructure, high electrical conductivity, extraordinary specific surface area, and unique porous architecture are essential properties in energy storage and conversion studies. A new type of hierarchical 3D cobalt encapsulated Fe3O4 nanosphere is successfully developed on N‐graphene sheet (Co?Fe3O4 NS@NG) hybrid with unique nanostructure by simple, scalable, and efficient solvothermal technique. When applied as an electrode material for supercapacitors, hierarchical Co?Fe3O4 NS@NG hybrid shows an ultrahigh specific capacitance (775 F g?1 at a current density of 1 A g?1) with exceptional rate capability (475 F g?1 at current density of 50 A g?1), and admirable cycling performance (97.1% capacitance retention after 10 000 cycles). Furthermore, the fabricated Co?Fe3O4 NS@NG//CoMnO3@NG asymmetric supercapacitor (ASC) device exhibits a high energy density of 89.1 Wh kg?1 at power density of 0.901 kW kg?1, and outstanding cycling performance (89.3% capacitance retention after 10 000 cycles). Such eminent electrochemical properties of the Co?Fe3O4 NS@NG are due to the high electrical conductivity, ultrahigh surface area, and unique porous architecture. This research first proposes hierarchical Co?Fe3O4 NS@NG hybrid as an ultrafast charge?discharge anode material for the ASC device, that holds great potential for the development of high‐performance energy storage devices. |
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Keywords: | 3D anode cobalt encapsulated Fe3O4 nanospheres graphene supercapacitors |
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