Journal
NANOSCALE
Volume 5, Issue 17, Pages 7984-7990Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr02710d
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Funding
- National Natural Science Foundation of China [21273029]
- Research Foundation for Doctoral Program of Higher Education of China [20120042110024]
- UCSC
- NSF [DMR-0847786]
- Natural Science Foundation of China [90923008, 21273290]
- Chancellor's Dissertation Year Fellowship
- China Scholarship Council
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Here we demonstrate a high energy density asymmetric supercapacitor with nickel oxide nanoflake arrays as the cathode and reduced graphene oxide as the anode. Nickel oxide nanoflake arrays were synthesized on a flexible carbon cloth substrate using a seed-mediated hydrothermal method. The reduced graphene oxide sheets were deposited on three-dimensional (3D) nickel foam by hydrothermal treatment of nickel foam in graphene oxide solution. The nanostructured electrodes provide a large effective surface area. The asymmetric supercapacitor device operates with a voltage of 1.7 V and achieved a remarkable areal capacitance of 248 mF cm(-2) (specific capacitance of 50 F g(-1)) at a charge/discharge current density of 1 mA cm(-2) and a maximum energy density of 39.9 W h kg(-1) (based on the total mass of active materials of 5.0 mg). Furthermore, the device showed an excellent charge/discharge cycling performance in 1.0 M KOH electrolyte at a current density of 5 mA cm(-2), with a capacitance retention of 95% after 3000 cycles.
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