Synthesis of Double-Layer Nitrogen-Doped Microporous Hollow Carbon@MoS2/MoO2 Nanospheres for Supercapacitors

In this work, a double-layer nitrogen-doped microporous hollow carbon@MoS2/MoO2 nanosphere (NCs@MoS2/MoO2) is prepared via a facile method utilizing Mo-mediated in situ growth on polyaniline-500 coated polystyrene spheres and carbonization process. Because of its unique structure, the as-obtained NCs@MoS2/MoO2 exhibits a high specific capacitance (569 F g(-1) at 1 A g(-1)) and excellent rate performance (54.8% capacitance retention) from 1 A g(-1) (569 F g-1) to 20 A g(-1) (312 F g(-1)) when directly used as a supercapacitor electrode. In a two-electrode system, it exhibits 81% capacitance retention and 91.4% Coulombic efficiency even after 5000 cycles at 5 A g(-1). Therefore, the prepared NCs@MoS2/MoO2 shows to be an outstanding material for supercapacitor electrodes.