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High Zn reversibility. a) Linear polarization curves of Zn and piZn in 2 mol L−1 ZnSO4. b) Long‐term galvanostatic cycling of symmetrical cells with Zn and piZn at a current density of 4 mA cm−2. c,d) SEM images of cycled Zn (c) and cycled piZn (d). Scale bar: 20 µm. e) XRD patterns of cycled Zn and piZn. f) Coulombic efficiency of Zn plating/stripping on stainless steel coated by the polyimide at a current density of 4 mA cm−2. The inset shows the stable region.
