▎ 摘　　要

The first report of oxygen functionalized few-layer graphene (OFG) having an interlayer distance of 3.6 angstrom as an excellent proton conductor (8.7 x 10(-3) S cm(-1) at 80 degrees C, 95% RH) utilizing hydrophilic oxygen functionalities present at sheet edges bypassing the theoretical limitation of proton conduction through a basal plane. The synthesized OFG also exhibited excellent supercapacitor performance (296 F g(-1)).