In:
Small, Wiley, Vol. 13, No. 33 ( 2017-09)
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 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.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.201701275
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2168935-0
Permalink