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a) CVs of AQDS (red line) and Fe(CN)6 4− (blue line) 1 mm in 1 m NaOH at scan rate 100 mV s−1 on a GC electrode. b) 10 charge–discharge curves in a 25 cm2 RF cell with a constant current density of 20 mA cm−2 and electrolyte concentration 0.1 m AQDS and 0.2 m ferrocyanide in 1 m NaOH. c) Capacity data for the 10 cycles in (b). The energy efficiency is around 75 %.
