Micro-mesoporous carbon spheres derived from carrageenan as electrode material for supercapacitors

The polysaccharide carrageenan is used as a natural precursor to prepare micro-mesoporous carbon spheres. The carbon spheres were synthesized by hydrothermal carbonization of carrageenan, and subsequent chemical activation by KOH at different temperatures. The obtained micro-mesoporous carbon spheres have high surface area (up to 2502 m2 g−1) and large pore volume (up to 1.43 cm3 g−1). Moreover, the micro- and mesoporosity can be finely tuned be...