fig3

Figure 3. (A) Schematic of HCS synthesis; (B) SEM and (C) TEM images of HCSs; (D) Schematic diagram of ZHSC consisting of carbon cathodes and zinc anodes; (E) CV curves at a scan rate of 5 mV s^-1; (F) GCD curves at 0.1 A g^-1. Reproduced with permission from Ref.^[76]. Copyright 2024, Wiley. HCSs: Hollow carbon spheres; SEM: scanning electron microscopy; TEM: transmission electron microscopy; ZHSCs: zinc-ion hybrid supercapacitors; CV: cyclic voltammetry; GCD: galvanostatic charge-discharge.