fig6

Figure 6. Volumetric capacity utilization. (A) Electrode compaction density of the meso-Nb₂O₅-500, meso-Nb₂O₅-700 and NP-40 nm electrodes; (B) GCD curves of the three electrodes at 25 mA·cm^-2; (C) The volumetric capacities of the three electrodes at different current densities; (D) The gravimetric and volumetric capacities of the three electrodes; (E) Cycling performance at 2.5 mA·cm^-2 of the three electrodes. GCD: Galvanostatic charge and discharge.