Journal
DALTON TRANSACTIONS
Volume 47, Issue 7, Pages 2266-2273Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt04127f
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Funding
- National Natural Science Foundation of China [21271082, 21371068]
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Hierarchical NiFe2O4@MnO2 core-shell nanosheet arrays (NSAs) were synthesized on Ni foam as an integrated electrode for supercapacitors, using a facile two-step hydrothermal method followed by calcination treatment. The NiFe2O4 nanosheets were designed as the core and ultrathin MnO2 nanoflakes as the shell, creating a unique three-dimensional (3D) hierarchical electrode on Ni foam. The composite electrode exhibited remarkable electrochemical performance with a high specific capacitance of 1391 F g(-1) at a current density of 2 mA cm(-2) and long cycling stability at a high current density of 10 mA cm(-2) (only 11.4% loss after 3000 cycles). Additionally, an asymmetric supercapacitor (ASC) device was fabricated with a NiFe2O4@MnO2 composite as the positive electrode material and activated carbon (AC) as the negative one. The ASC device exhibited a high energy density (45.2 W h kg(-1)) at a power density of 174 W kg(-1), and an excellent cycling stability over 3000 cycles with 92.5% capacitance retention. The remarkable electrochemical performance demonstrated its great potential as a promising candidate for high-performance supercapacitors.
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