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. 2017 Jan 18;7:40910. doi: 10.1038/srep40910

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(a) CV scan at a scan rate of 0.2 mV s⁻¹ in a voltage range of 1.2–4.5 V. (b) Charge-discharge profiles at a current density of 30 mA g⁻¹ in the 1^st, 2^nd, 30^th, and 1000^th cycles. (c) Electrochemical impedance spectroscopy analysis of as-fabricated and after 1000^th cycles of RGO cathode and the inset shows the circuit diagram, used to calculate the charge-transfer resistance. (d) Cycle stability in a voltage range of 1.2–4.5 V at a current density of 30 mA g⁻¹.