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(a) Shelving-recovery performance of Cu foam@Zn/Cu foam@Zn symmetric cell (AIO electrode/Cu foam@Zn in AIO system) under 2 mA cm–2. (b) First cyclic voltammetry curve, (c) float charge current, (d) open circuit potential decays of AIO electrode/α-MnO2 and Cu foam@Zn/α-MnO2 full cell. (e) XRD patterns of the anodes in different full cell systems after 100 cycles at 500 mA g–1, and the corresponding SEM images of (f) AIO electrode and (g) Cu foam@Zn in 2 M ZnSO4 + 0.1 M MnSO4.
