Hierarchical 3D Cobalt‐Doped Fe3O4 Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors

Small - Tập 13 Số 33 - 2017
Meng Guo1, Jayaraman Balamurugan1, Xuyang Li1, Nam Hoon Kim1, Joong Hee Lee1,2
1Advanced Materials Institute of BIN Convergence Technology, (BK21 Plus Global) & Department of BIN Convergence Technology, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
2Carbon Composite Research Centre, Department of Polymer Nano Science and Technology, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea

Tóm tắt

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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Tập 13 Số 33

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