fig2

Figure 2. (A) Scanning electron microscopy (SEM) images of as-prepared nano Mg anode with different morphologies: (i) sphere-like; (ii) plate-like; (iii) rod-like; (iv) sea urchin-like^[19]. (B) SEM images of Mg thin films prepared at different substrate temperatures: (i) 25 ℃; (ii) 80 ℃; (iii) 120 ℃; (iv) 150 ℃^[20]. (C) Discharge profiles of primary Mg-air batteries with Mg thin films prepared at different substrate temperatures, showing that the Mg thin films prepared at 150 ℃ performed the best^[20]. Charge/discharge profiles of rechargeable Mg-air batteries at 200 mA·g^-1 using (D) pristine Mg with a Mg(TFSI)₂/G2 electrolyte under pure O₂ and (E) Bi-based protective modified Mg with a Mg(TFSI)₂/G2 electrolyte under pure O₂^[21]. (F) Schematic diagram of the preparation of a Bi-based protective layer on a Mg anode^[21]. Reproduced from Refs.^[19-21] with permission from Wiley, the Royal Society of Chemistry, and the American Chemical Society, respectively. DME: Dimethoxyethane.