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Hierarchical 3D Cobalt‐Doped Fe 3 O 4 Nanospheres@NG Hybrid as an Advanced Anode Material for High‐Performance Asymmetric Supercapacitors
Author(s) -
Guo Meng,
Balamurugan Jayaraman,
Li Xuyang,
Kim Nam Hoon,
Lee Joong Hee
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701275
Subject(s) - supercapacitor , materials science , capacitance , anode , current density , specific surface area , nanostructure , nanotechnology , power density , electrode , graphene , electrochemistry , chemical engineering , porosity , composite material , chemistry , biochemistry , physics , power (physics) , quantum mechanics , engineering , catalysis
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 Fe 3 O 4 nanosphere is successfully developed on N‐graphene sheet (Co−Fe 3 O 4 NS@NG) hybrid with unique nanostructure by simple, scalable, and efficient solvothermal technique. When applied as an electrode material for supercapacitors, hierarchical Co−Fe 3 O 4 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−Fe 3 O 4 NS@NG//CoMnO 3 @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−Fe 3 O 4 NS@NG are due to the high electrical conductivity, ultrahigh surface area, and unique porous architecture. This research first proposes hierarchical Co−Fe 3 O 4 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.