fig4

Figure 4. (A) The partially reduced graphene oxide (rGO) coated on a 3D-Cu current collector, termed rGO@3D-Cu; Thermally infused symmetric rGO@3D-Cu//rGO@3D-Cu, with baseline Cu//Cu. This figure is quoted with permission from Liu et al.^[92]. (B) The fabrication of Cu₃Pt-Cu mesh, the process of Galvanic replacement reaction and the 2D electron density difference maps of K adsorbed Pt, Cu, and Cu₃Pt; Voltage-time profiles of K||K, K@Cu mesh||K@Cu mesh and K@Cu₃Pt-Cu mesh||K@Cu₃Pt-Cu mesh symmetric cells at 0.5 mA cm^-2 and 1 mAh cm^-2. This figure is quoted with permission from Wang et al.^[93].