“…The CAG materials were synthesized via the gelatinization process of different types of starch (rice, maize, and potato, Sigma Aldrich, Saint Louis, MO, USA) followed by the solvent exchange, the drying process, and the carbonization of the obtained samples under argon (Air Products, 99.999%, Allentown, PA, USA) flow (described in detail previously by our group [12,24,25,26]). The temperature of the pyrolysis process was established at 600 °C, 700 °C, 900 °C, 1200 °C, and 1600 °C, with a constant heating rate (2°/min) and the temperature being maintaining for 6 h.…”