Enhancement in the Specific Energy of B‐doped Graphene Using Redox Additive Electrolytes

Electrochemical performance of carbon materials can be enhanced by doping with heteroatoms. Electrochemical investigations suggest that the B‐doped graphene in which B‐source and graphene oxide are in the ratio 1 : 1 demonstrates a highest specific capacitance of 406 F/g at 2 A/g in 1 M H 2 SO 4 . The specific capacity of B‐doped graphene in 0.01 M hydroquinone (HQ)/H 2 SO 4 is 2523 C/g in redox additive electrolyte. Performance evaluation of fabricated symmetric supercapacitor cell indicates that the specific capacitance in 0.01 M HQ/H 2 SO 4 and 1 M H 2 SO 4 solution are found to be 440 and 284 F/g at 3 A/g, respectively and greater than EMIMBF 4 (97 F/g). The maximum specific energy of the fabricated symmetric cell achieved using 0.01 M HQ/H 2 SO 4 solution is found to be 50 Wh/kg which is comparatively superior than 1 M H 2 SO 4 (14.2 Wh/kg) and EMIMBF 4 (30 Wh/kg).