Higher energy density of MoSe₂/polyaniline capsule nanospheres for enhanced performance supercapacitor

It is very important to develop novel nanocomposites as electrode materials for supercapacitors (SCs). MoSe₂porous nanospheres were prepared by one-step hydrothermal method, and polyaniline (PANI) nanosheets were grownin situto obtain MoSe₂/PANI capsule nanospheres (CNs). By changing the amount of aniline, it was found that MoSe₂/PANI-16 CNs had the best electrochemical performance, and a high specific capacitance of 753.2 F g^-1was obtained at a current density of 1 A g^-1. In addition, the interface electron transport path was clarified that a C-Mo-Se bridge bonds may be formed for rapid electron transfer. The reaction kinetics was also explored. The large specific surface areas of MoSe₂/PANI CNs provided more reactive sites, so that the contribution of pseudocapacitance was much larger than diffusion capacitance. The assembled MoSe₂/PANI//activated carbon asymmetric supercapacitor has a energy density of 20.1 Wh kg^-1at a power density of 650 W kg^-1. These results indicate that the MoSe₂/PANI CNs are a promising electrode material.