▎ 摘　　要

All-solid-state planar on-chip supercapacitors (APCSs) was prepared based on reduced graphene oxide films obtained by liquid-air interfacial assembly method and hydroiodic acid treatment. The reduced graphene oxide films (495.44 S cm(-1)) have good surface morphologies, uniform thickness and a higher carbon to oxygen atomic ratio (C/O = 11.5) after hydroiodic acid treatment. The APCSs based on reduced graphene oxide delivered an area capacitance 69.57F cm(-2) and a stack capacitance 2.34 F cm(-3). Moveover, they show an energy density of 324.23Wh cm(-3) and a power density of 1167.21W cm(-3). The demonstrated APCSs provide an important reference for the study of planar supercapacitors.