▎ 摘　　要

Chemical oxidation is used to cut and unzip multi- walled carbon nanotubes in the transverse direction and the axial direction to form graphene oxide nanoribbon ( GONR). Ruthenium oxide/ reduced graphene oxide nanoribbon composite ( RuO2/ rGONR) with a 72.5 wt% RuO2 loading is synthesized through an aqueous- phase reaction, in which GONR is served as starting material, followed by mild thermal treatment in ambient air. The resulting RuO2/ rGONR composite achieves specific capacitance up to 677 F center dot g(-1) at the current density of 1 A center dot g(-1) in three- electrode system using 1 mol center dot L-1 H2SO4 as electrolyte. The resultant electrode exhibits an excellent rate capability ( 91.8% retention rate at 20 A center dot g(-1)). Especially, the symmetric supercapacitor assembled on the basis of RuO2/ rGONR electrode delivers high energy density ( 16.2 Wh center dot kg. 1) even at the power density of 9885 W center dot kg(-1), which is very essential for supercapacitors.