S/N Co-Doped Activated Mesoporous Carbon derived from Protein-Rich Dried Pollock for Supercapacitor

Biomass derived activated carbon has been emerged as alternatives to the depletable resources due to its sustainability and low cost. Large surface area and the optimal pore distribution of micropores, mesopores, and macropores are crucial for achieving high performance activated carbon. Thereby, we synthesized KOH activated carbon derived from protein-rich dried pollack which exhibits mesoporous structure with high surface area. We improved the electrolyte wettability and charge transfer capability by performing a doping process to introduce electrochemically active nitrogen species (graphitic N and pyrrolic N) and functional groups forming surface functionalities (C-N, C-S). 2SN-DP electrode shows the largest specific surface area (2764.8 m ² g ^-1 ), favorable pore distribution, nearly capacitive charge storage behavior (b ≈ 0.774), and superior specific capacitance (189.5 F g ^-1 at a current density of 0.2 A g ^-1 and 128.52 F g ^-1 at 20 A g ^-1 ). The outstanding performance of 2SN-DP electrode was attributed to the interactive effects of improved ion transportation and conductivity provided by KOH activation and N/S co-doping.