fig3

Figure 3. (A) Schematic illustration of the changes in HC precursors with increasing temperature during the pyrolytic carbonization process^[34] (Copyright 2018, Elsevier Ltd). (B) (i) Typical XRD patterns (Cu K-alpha source) indexed in 2H graphite referential; (ii) graphical representation of the fine structure; and (iii) typical voltage-charge profiles at the second cycle in sodium half cell of graphite (grey), soft carbon (green), HC (black), and graphene (reduced graphite oxide, orange)^[104] (Copyright 2018, WILEY-VCH).