fig20

Figure 20. Morphology characterization of 3D Co/N-C. (A) SEM; (B) TEM; (C) Graphical abstract;(D) Schematic diagram of an aqueous zinc-air battery; (E) Discharge polarization lines of 3D Co/N-C and 20% Pt/C based air electrodes for the rechargeable ZABs and the correspondent power density curves of ZABs; (F) Galvanostatic discharging plots at a current density of 10 mA·cm^-2 of 3D Co/N-C and 20% Pt/C + IrO_2. Reproduced with permission. Copyright 2022, Elsevier^[271]; Morphology and composition characterization of NGM-Co catalysts. (G) SEM; (H) Dark-field high-resolution TEM image; (I) Charge and discharge polarization curves of the NGM-Co and Pt/C + Ir/C catalysts; (J) Galvanostatic discharge-charge cycling curves at 5.0 mA·cm^-2 of the rechargeable Zn-air batteries with the NGM-Co or Pt/C + Ir/C catalysts; (K) Discharge curves of Zn-air batteries assembled from the NGM-Co and Pt/C + Ir/C catalysts at 20.0 mA·cm^-2 discharging rate; (L) Photograph of a toy car powered by one Zn-air battery based on NGM-Co catalyst; (M) Long time cycling test at 2.0 mA·cm^-2. Reproduced with permission. Copyright 2017, Wiley Online Library^[276].