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 synthe-sized using PS (polystyrene) beads as the hard template. In 1 M Na2SO4solution, it exhibits a specific capac-itance value of 295F g-1at the current density of 1 A g-1. After 20,000 charge/discharge cycles at the currentdensity of 10 A g-1, the capacitance retention rate is 100%. The MnO2@H-PPy (1:4)-based asymmetric super-capacitor shows a specific capacitance of 63F g-1in a potential window of 0 to + 2.2 V at the current densityof 1 A g-1. The energy density is 42 Wh kg-1and the power density is 1100 W kg-1, which proved to be apromising candidate for the electrode materials in supercapacitor applications

Automated summary

The new MnO2@polypyrrole mesoporous composite with hollow microsphere structure exhibited a high specific capacitance value in Na2SO4 solution and showed excellent capacitance retention rate after long cycles of charge/discharge testing. In an asymmetric supercapacitor, it displayed high energy density and power density, indicating its potential as electrode material for supercapacitor applications.