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A maximum gravimetric capacitance of 175 F.g−1 (85 mAh.g−1) was obtained at 80 °C.
For example, the maximum gravimetric capacitance is 705 F g−1 with the energy density of 29.6 Wh kg−1 at a current density of 1 A g−1.
The thinner sample activated for 30 min has a maximum volumetric capacitance of 220 F/cm3 and achieves a maximum gravimetric capacitance of 240 F/g when the texture becomes bimodal after 240 min of activation.
The effects of modification conditions on supercapacitive behavior were systematically studied, a maximum gravimetric capacitance (Cm) and volumetric capacitance (Cv) of 234 F g−1 and 36 F cm−3 were obtained in 2 M KOH solution.
The HCNTF SC exhibits a maximum gravimetric capacitance of 125.7 F g−1 with an area specific capacitance of 145.3 mF cm−2 at a current density of 0.28 mA cm−2.
Similar(55)
Hydrogen sorption experiments at −195.8 °C and atmospheric pressure showed a maximum gravimetric capacity of ∼330 cm3/g (3.0 wt.%).
The electrodes fabricated from 30 Fe3O4/RGO bilayers exhibited excellent capacitive performances with a maximum specific gravimetric capacitance (151 F/g) at a current density of 0.9 A/g.
Both materials show capacitive behavior characteristic of high surface area electrodes for supercapacitors, with the maximum full cell gravimetric capacitance being 34 F/g for YP17 and 20 F/g for SWCNTs at 2.5 V with respect to the total active electrode mass.
The optimized aerogel with a packing density of 0.67 g cm−3 could deliver maximum gravimetric and volumetric capacitances of 128.2 F g−1 and 85.9 F cm−3, respectively, at a current density of 1 A g−1 in aqueous electrolyte, showing no apparent degradation to the specific capacitance at a current density of 10 A g−1 after 20000 cycles.
The derived relations are used to optimize the electrode design parameters regarding maximum gravimetric and volumetric capacity.
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.
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