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Charge Transfer in Ultrafine LDH Nanosheets/Graphene Interface with Superior Capacitive Energy Storage Performance.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2017 Nov 01; Vol. 9 (43), pp. 37645-37654. Date of Electronic Publication: 2017 Oct 17. - Publication Year :
- 2017
-
Abstract
- Two-dimensional LDH nanosheets recently have generated considerable interest in various promising applications because of their intriguing properties. Herein, we report a facile in situ nucleation strategy toward in situ decorating monodispersed Ni-Fe LDH ultrafine nanosheets (UNs) on graphene oxide template based on the precise control and manipulation of LDH UNs anchored, nucleated, grown, and crystallized. Anion-exchange behavior was observed in this Ni-Fe LDH UNs@rGO composite. The Ni-Fe LDH UNs@rGO electrodes displayed a significantly enhanced specific capacitance (2715F g <superscript>-1</superscript> at 3 A g <superscript>-1</superscript> ) and energy density (82.3 Wh kg <superscript>-1</superscript> at 661 W kg <superscript>-1</superscript> ), which exceeds the energy densities of most previously reported nickel iron oxide/hydroxides. Moreover, the asymmetric supercapacitor, with the Ni-Fe LDH UNs @rGO composite as the positive electrode material and reduced graphene oxide (rGO) as the negative electrode material, exhibited a high energy density (120 Wh kg <superscript>-1</superscript> ) at an average power density of 1.3 kW kg <superscript>-1</superscript> . A charge transfer from LDH layer to graphene layer, which means a built in electric field directed from LDH to graphene can be established by DFT calculations, which can significantly accelerate reaction kinetics and effectively optimize the capacitive energy storage performance.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 9
- Issue :
- 43
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 28991430
- Full Text :
- https://doi.org/10.1021/acsami.7b09373