Sandwich-like ternary hierarchical nanosheets MnO2/PANI/RGO are fabricated.
MnO2/PANI/RGO exhibit high specific capacitance of 1090.2 F g−1 at 0.5 A g−1.
MnO2/PANI/RGO retains 82.3% initial capacity after 5000 cycles at 0.5 A g−1.
Ternary hierarchical nanosheets improve electrochemical properties.