Hierarchical porous carbon microspheres derived from porous starch for use in high-rate electrochemical double-layer capacitors

- Biomass waste porous starch was utilized to fabricate hierarchical porous carbon.
- The nanocarbon contains inherent macropores and KOH-creating meso- and micropores.
- The capacitance could be maintained at 197 F g−1 even at 180 A g−1.