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As cathode materials for pseudo-capacitors, the TiO2/NiO core/shell nanorod arrays display impressive electrochemical performances with both high capacitance of 611 F g−1 at 2 A g−1, and pretty good cycling stability with a retention of 89% after 5000 cycles.
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The assembled symmetric device based on this structure shows both a high capacitance of 808 F g−1 at 1 A g−1 and a high gravimetric energy density (28.06 Wh kg−1 at a power density of 0.25 kW kg−1).
Even cycled at high current density of 5 A g−1, high capacitance of over 280 F g−1 can be still retained in both electrolytes.
Optimized Ni(OH 2/rGO//AC ASC exhibited a high capacitance of 102.3 F/g.
Due to multiple redox reactions on nickel cobaltite, a high capacitance of 845 F g−1 can be obtained.
The as-obtained NiCo2O4@CC electrode exhibits a high capacitance of 1183 mF cm−2 and an outstanding capacitance retention of 90.4% after 3000 cycles.
As can be seen in Fig. 5b, a remarkably high capacitance of 173 mF cm−2 and 39 mF cm−2 was measured, at nearly equilibrium conditions (~2 mV s−1); this is the highest areal capacitance measured for any Sn-based electrode, to the best of our knowledge.
Therefore, the high capacitance of activated carbon fibers is a synergy of pseudocapacitance and double-layer capacitance.
High capacitance of 17.4 F/cm3 and energy density of ~3.48 mWh/cm3 were achieved for the CoO/CNT MSC at a current density of 0.25 A/cm3.
Further electrochemical performance shows that the NixSy@CoS exhibits remarkably high capacitance of 2291 F g−1 at 1.0 A g−1 in 6 M KOH aqueous solution.
Co9S8//CoFe2O4 asymmetric supercapacitor reveals a high capacitance of 79.11 F g−1 with 28.88 Wh kg−1 energy density and superior cyclic stability over 2500 cycles (∼87%).
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