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(a) Schematics of the two-step electroplating process for preparing AIO electrodes, and photos of Cu foam, Cu foam@Zn, and AIO electrodes. (b) Cross-sectional photo and (c) cross-sectional SEM image of the AIO electrode. (d) Diagram of battery assembly. (e) XRD patterns of Cu foam and Cu foam@Zn. (f) FT-IR spectra of gel membrane and its corresponding vibration form.
