fig9

Figure 9. (A) Micrographs of S-RGO-180, (A-1) FE-SEM image of S-RGO-180 and (A-2) the corresponding C-, O-, and S-elemental mappings; (B) LSV curves of RGOs, S-RGOs, and Pt/C; (C) Rotating-disk voltammograms recorded for S-RGO-180 electrode in an O₂-saturated 0.1 M KOH solution at a different rotation rate. The inset in (C) shows the corresponding Koutecky-Levich plots (J^-1vs.ω^-0.5) at different potentials; (D) The magnified Nyquist plots of RGO-180 and S-RGOs. Reproduced with permission. Copyright 2014, Royal Society of Chemistry^[124]; (E) Schematic illustration of the synthesis process of B-hG and its charge/discharge processes as cathode for LOBs. Reproduced with permission. Copyright 2022, Elsevier^[131].