▎ 摘　　要

Reduced graphene oxide (rGO) obtained from aqueous graphene oxide ( GO) tends to agglomerate with time and hinders the commercial scale applications for high-density energy storage. Here, we report a photo-catalytic reduction of GO dispersions in N-Methyl2-Pyrrolidone (NMP) under deep UV light (lambda similar to 253 nm) for 60 min. The obtained hydrophobic rGO dispersions are electrochemically stable for more than 160 d and exhibit a high Brunauer-Emmet-Teller (BET) surface area of similar to 260 m(2) g(-1). The NMP being a dipolar aprotic solvent serves as an electron donor and its high dipole moment enhances the electrochemical stability of rGO. Furthermore, the fabricated supercapacitor exhibits a high specific capacitance, charge retention, energy and power density of similar to 220 F g(-1) (current density of 0.5 A g(-1)), up to 1000 charging/discharging cycles, 7.32 Wh kg(-1) and 130 W kg(-1), respectively. The high stability of dispersion and electrochemical performance of synthesized rGO is envisaged for potential applications in high density energy storage and conductive inks for flexible electronics.