Design and fabrication of polypyrrole/expanded graphite 3D interlayer nanohybrids towards high capacitive performance

, and could retain superb stability after 2000 cycles. The unique self-supporting structure feature and homogeneous PPy nanosphere coating combined the contributions of electrochemical double layer capacitance and pseudo-capacitance, which made the nanohybrids an excellent electrode material for high performance energy storage devices.