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Electrode materials based on transition metal selenide have lately gained much favor in electrochemical supercapacitor owing to their outstanding capacitive performance, abundant availability and high electrical conductivity. In this study, we developed SmSe based reduced graphene oxide (rGO) nanocomposite via solvothermal technique. First, it is established that the SmSe/rGO nanoarray forms a porous microstructure in three dimensions. Various instrumental investigation was employed to examined the material microscopic and spectroscopic properties. The as-synthesized SmSe/rGO nanostructure possesses an outstanding specific capacitance (Cs) of 1226 F g−1 @ 1 A g−1 and remarkable long-cycle efficiency of 95.84% retention capacitance after 5000 cycles @ 1 A g−1. The incorporation of rGO into SmSe nanostructure is responsible for faster transfer of electron and providing high surface area having greater active sites which are responsible for the higher efficiency. [Display omitted] • The 2D-rGO based SmSe nanocomposite was developed via simple hydrothermal approach. • The electrode material suggests the specific capacitance of 1226 F g-1 @ 1 A g-1. • The nanohybrid display the smaller Rct of 1.28 Ω than the other materials. • The incorporation of rGO into SmSe facilitates faster transfer of electron. [ABSTRACT FROM AUTHOR]