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Nickel-Cobalt Layered Double Hydroxide Nanowires on Three Dimensional Graphene Nickel Foam for High Performance Asymmetric Supercapacitors.
- Source :
-
Electrochimica Acta . Oct2016, Vol. 215, p492-499. 8p. - Publication Year :
- 2016
-
Abstract
- In this paper, three dimensional reduced graphene oxide skeleton onto nickel foam (3D RGO NF) was fabricated by a facile dip-coating method combined with alkaline reduction. The as-prepared skeleton was used as a substrate to immobilize Ni-Co layered double hydroxide (Ni-Co LDH) with special morphology of nanowires to effectively prevent the agglomeration of material. The Ni-Co LDH/3D RGO NF electrode exhibited an enhanced specific capacitance of 1054 F g −1 compared with Ni-Co LDH/NF, excellent rate capability (60% capacitance retention with a ten-fold increase in current density) as well as long cyclic life (95% capacity retention after 2000 cycles). In addition, an aqueous asymmetric supercapacitor was composed of Ni-Co LDH/3D RGO NF as positive electrode and activated carbon as negative electrode, which exhibited a specific capacitance of 108.7 F g −1 at 2 mA cm −2 in a potential range from 0 to 1.6 V; it showed maximum energy density of 38.6 Wh kg −1 at 69.5 W kg −1 . Moreover, the Ni-Co LDH/3D RGO NF//AC has an outstanding cycling stability (about 70% capacitance retention after 4000 cycles), which makes it a potential candidate for electrochemical energy storage devices. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NANOWIRES
*CARBON foams
*NICKEL
*HYDROXIDES
*SUPERCAPACITORS
Subjects
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 215
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 118180319
- Full Text :
- https://doi.org/10.1016/j.electacta.2016.08.134