Orientated VSe2 nanoparticles anchored on N-doped hollow carbon sphere for high-stable aqueous energy application.

Abstract Transition metal dichalcogenides (TMDs) have been considered as the promising energy storage materials due to their unique crystalline structure. In this work, the VSe2 nanoparticles are vertically anchored on N-doping carbon (NC) hollow nanosphere (VSe2@NC) for aqueous energy application. The electrochemical measurements indicate that the VSe2@NC electrode exhibits outstanding electrochemical properties with high specific capacitance and excellent cycling life. Moreover, the asymmetric supercapacitor was assembled by using VSe2@NC cathode and activated carbon anode. It shows high energy density of 85.41 Wh Kg-1 at a power density of 701.99 W Kg-1, and high-stable cycling performance of 90 % retention after 2000 cycles. The superior properties are attributed to the particular hollow structure design, which accommodates both the high specific capacity of VSe2 and the desired electrical conductivity of N-doping carbon sphere template.