Graphene from Electrochemically Exfoliated Graphite

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Graphene from Electrochemically Exfoliated Graphite ( graphene-from-electrochemically-exfoliated-graphite )

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a) 1.0 0.8 0.6 0.4 0.2 0 0.01 b) 80 40 0 -40 c) 50 40 30 20 10 0 d) 1 100 10000 -80 0 100 90 80 70 60 50 0 0.4 0.8 1.2 1.6 Frequency (Hz) Voltage (V) 0 50 100 150 200 Current density (mA cm-2) 2000 4000 6000 8000 No cycle 10000 Figure 9. Supercapacitor performance of the solvated graphene films. a) Frequency dependence of capacitance in the 1 M H2SO4 and Li2SO4 electrolytes, b) cyclic voltammograms at increasing scan rate of 1 M Li2SO4, c) impact of the discharge current density on the electrode areal capacitance in 1 M Li2SO4 and d) long-term cycling stability at 5 A g-1 and 1.6 V. 31 50mVs-1 2Vs-1 500mVs-1 5Vs-1 1Vs-1 H2SO4 Li2SO4 Electrode areal capacitance C/Cmax (mF cm-2) Electrode areal capacitance Capacitance retention (%) (mF cm-2)

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