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The as-prepared composites exhibit a highest gravimetric capacitance 670 F g−1 and an outstanding volumetric capacitance 1090 F cm−3 at the current density of 1 A g−1.
The highest gravimetric capacitance of 298.5 F g−1 was obtained in the prepared PANI sample using 3 mmol K2Cr2O7 derived from the CV at a scan rate of 5 mV s−1 and the maximum value of gravimetric capacitance of 330.2 F g−1 was achieved in the galvanostatic charge discharge measurements at a current density of 0.5 A g−1.
As expected, sample with the highest surface area, C3060, possesses the highest gravimetric capacitance at all examined discharge current densities (0.2 2 A/g).
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Wang, X. et al. Geometrically confined favourable ion packing for high gravimetric capacitance in carbon ionic liquid supercapacitors.
The resultant hybrid papers showed high gravimetric capacitance of 337.6 F g−1 (0.5 A g−1) and volumetric capacitance of 151.2 F cm−3 (0.25 A cm−3).
A high gravimetric capacitance of 71.4 F g−1 at a current density of 0.5 A g−1 can be achieved.
Moreover, hybrid rGO/CDC electrodes, in contrast to solely rGO-based counterparts, maintained high gravimetric capacitance as the electrode thickness increased from 5 μm to ∼50 μm.
In addition, the assembled symmetric device based on the hybrid papers exhibited high gravimetric capacitance of 291.6 F g−1 (0.5 A g−1) and volumetric capacitance of 136.6 F cm−3 (0.25 A cm−3).
The DCNFs can be directly used as electrodes to assemble flexible supercapacitors, which show a high gravimetric capacitance of 133 F g−1 and excellent high-rate performance in ionic liquid electrolyte.
When directly use as electrode materials, the as-synthesized Ni-MOFs single-crystal electrodes behave as pseudo-capacitor and deliver high gravimetric capacitance with superior energy deliverable ability and cycling stability.
Foams with roughness factors as high as 1100 were obtained, showing a high geometrical area normalized double-layer capacitance and relatively high gravimetric capacitance of 22 mF cm−2 and 2.4 F g−1, respectively.
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