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5 years ago

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

Hierarchical 3D Cobalt-Doped Fe3O4 Nanospheres@NG Hybrid as an Advanced Anode Material for High-Performance Asymmetric Supercapacitors
Meng Guo, Xuyang Li, Joong Hee Lee, Nam Hoon Kim, Jayaraman Balamurugan
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. Hierarchical 3D Co−Fe3O4 NS@NG hybrid is successfully fabricated by one-step solvothermal method and used as anode for high-energy asymmetric supercapacitors (ASCs). The fabricated CoMnO3@NG//Co-Fe3O4 NS@NG ASC delivers ultrahigh energy density of 89.1 Wh kg−1 at power density of 901 W kg−1.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701275

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