fig12

Figure 12. Electrochemical performance of coin cells with VONTs as cathode and Zn as anode in the range of 0.3-1.9 V vs. Zn/Zn⁺: (A) Ragone plot of different materials; (B) rate performance at current densities from 0.1 to 9.6 A g^-1; (C) charge/discharge curves; (D) cycling performance at a current density of 2.4 A g^-1. Reproduced with permission from Ref.^[180] (Copyright 2019, Journal of Power Sources, Elsevier). VONTs: Vanadium oxide nanotubes.