A Mno2@Polypyrrole Composite with Hollow Microsphere Structure for Electrode Material of Supercapacitors

In this work, a new MnO2@polypyrrole mesoporous composite with hollow microsphere structure is synthesized using PS (polystyrene) beads as the hard template. In 1M Na2SO4 solution, it exhibits a specific capacitance value of 295 F g-1 at the current density of 1 A g -1. After 20000 charge/discharge cycles at the current density of 10 A g-1, the capacitance retention rate is 100 %. The MnO2@H-PPy (1:4)-based asymmetric supercapacitor shows a specific capacitance of 260 F g-1 in a potential window of 0 to + 2.2 V at the current density of 1 A g-1. The energy density is 177.78 Wh kg-1 and the power density is 3783.03 W kg-1, which proved to be a promising candidate for the electrode materials in supercapacitor applications.