期刊
RSC ADVANCES
卷 8, 期 27, 页码 15222-15228出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra02559b
关键词
-
资金
- National Sciences Foundation of China [21271082, 21371068]
In this contribution, NiFe2O4@NiFe2O4 nanosheet arrays (NSAs) with three-dimensional (3D) hierarchical core-shell structures were synthesized by a facile one-step hydrothermal method and they were used as electrode materials for supercapacitors (SCs). The NiFe2O4@NiFe2O4 composite electrode showed a high specific capacitance of 1452.6 F g(-1) (5 mA cm(-2)). It also exhibited a superior cycling stability (93% retention after 3000 cycles). Moreover, an asymmetric supercapacitor (ASC) was constructed utilizing NiFe2O4@NiFe2O4 NSAs and activated carbon (AC) as the positive and negative electrode, respectively. The optimized ASC shows extraordinary performances with a high energy density of 33.6 W h kg(-1) at a power density of 367.3 W kg(-1) and an excellent cycling stability of 95.3% capacitance retention over 3000 cycles. Therefore, NiFe2O4@NiFe2O4 NSAs have excellent pseudocapacitance properties and are good electrode materials for high energy density.
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