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Facile synthesis of MnO2@NiCo2O4 core–shell nanowires as good performance asymmetric supercapacitor
Ist Teil von
Journal of materials science. Materials in electronics, 2020, Vol.31 (2), p.1355-1366
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Hierarchical MnO
2
@NiCo
2
O
4
core–shell nanostructures are well fabricated via a simple two-step hydrothermal process. The MnO
2
@NiCo
2
O
4
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 MnO
2
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 MnO
2
@NiCo
2
O
4
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 MnO
2
@NiCo
2
O
4
is the promising candidate of supercapacitors.