▎ 摘　　要

NOVELTY - Graphene is dispersed in 25-35% hydrogen peroxide at room temperature of 25-35 degrees C, and the temperature is increased to 60-70 degrees C for 24-72 hours, to obtain mixture of porous graphene and graphene quantum dots. The obtained mixture is filtered, to obtain solution of graphene quantum dots as filtrate and residue of porous graphene. The residue is dried at 40-60 degrees C for 1-3 hours. The obtained filtrate is dialyzed in dialysis bag for 1-3 days at 27-30 degrees C, to obtain solution of graphene quantum dots. The porous graphene is doped with nitrogen, to obtain nitrogen-doped porous graphene. USE - Synthesis of nanoporous graphene and photo luminescent graphene quantum dots used for gas separation, water desalination, single atom e.g. platinum, cobalt and indium doping, nano-electronics, lithium-ion battery, lithium-air battery, solar cell, super capacitor, gas sensor and polymer electrolyte membrane fuel cell (all claimed). ADVANTAGE - The method is simple and economical, and enables synthesis of nanoporous graphene and photoluminescent graphene quantum dots, with high yield and without wastage of carbonaceous material. The nitrogen-doped porous graphene has excellent activity with respect to electrochemical oxygen reduction reaction, and enables oxygen reduction reaction with overpotential difference of 80 mV. The holes on the porous graphene provide more edge sites which are used as trapping site for doping other heteroatoms such as boron and phosphorus.