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Voltage profiles and CE of Zn plating/stripping in Zn‖Cu batteries with (a) and (c) 2 M Zn(CF3SO3)2 electrolyte and (b) and (d) ZHD30 electrolyte with a current density of 0.2 mA cm−2 and an areal capacity of 0.2 mAh cm−2. Insets of (e) and (f) are the images captured by an AFM optical camera during Zn plating processes.
