fig5

Figure 5. (A) Schematic diagram of pore channels of mPDA/rGO nanosheets and their interaction mechanism with lithium ions; (B) Cyclic voltammetry curves at a scanning rate of 0.5 mV·s^-1; (C) charge/discharge curves at a current density of 50 mA·g^-1; and (D) rate performance at a current density of 50 to 2,000 mA·g^-1 of mPDA/rGO nanosheets and the comparison samples; (E) Stability test diagram of mPDA/rGO-2 for 1,000 cycles at a current density of 2,000 mA·g^-1. This figure is quoted with permission from Wang et al.^[101]. mPDA: Mesopore polydopamine; rGO: reduced graphene oxide; PDA: polydopamine.