Figure 7

Electrochemical performances of the HPCAs-0.4-800//HPCAs-0.4-800 symmetric cell: (a) CV curves at various sweep rates. (b) GCD curves recorded at 1-20 A g⁻¹. (c) Ragone plot. (d) Cycling stability measured at 4 A g⁻¹ with inset showing GCD curves (1 A g⁻¹) before and after 10,000 cycles.