Potassium compound-assistant synthesis of multi-heteroatom doped ultrathin porous carbon nanosheets for high performance supercapacitors

Multi-heteroatom (N, O, S) doped ultrathin porous carbon nanosheets (PCNSs) have been prepared with the assistance of the KOH derived potassium compounds using fish scale as precursor. The unique 2D porous nanosheet structure, micropore-dominate porosity, rich surface heteroatoms and high compacting density endow the electrodes with both high gravimetric and volumetric capacitive performance.197