Facile synthesis of MnO2@NiCo2O4 core–shell nanowires as good performance asymmetric supercapacitor
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Hierarchical MnO2@NiCo2O4 core–shell nanostructures are well fabricated via a simple two-step hydrothermal process. The MnO2@NiCo2O4 core–shell nanostructures materials electrode presents a high capacitance of 684 F g−1 at 2 A g−1 current density, 40 times higher than that of the single MnO2 nanowires electrode. And 87.4% retain is approached even at a high current density of 15 A g−1, showing satisfactory rate capability. Furthermore, the theoretical analysis reveals the surface capacitance contribution is predominant in the capacitive contribution. The asymmetric supercapacitor assembled with MnO2@NiCo2O4 exhibited a maximum energy density of 35.6 Wh kg−1 and a maximum power density of 745.1 W kg−1. After 7000 charge–discharge cycling at a current density of 4 A g−1, it still can maintain 90% of the initial capacitance. These results suggest that MnO2@NiCo2O4 is the promising candidate of supercapacitors.
The financial support from the National Natural Science Foundation of China (Nos. 21301007 and 21301006) and Anhui Normal University Nurturing Project (No. 2016XJJ001) are acknowledged.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
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