Three-dimensional polypyrrole/MnO2 composite networks deposited on graphite felt as free-standing electrode for supercapacitors

• Polypyrrole/MnO2/graphite felt composite was fabricated for the first time.
• The polypyrrole/MnO2 composites deposited on graphite felt constructs a unique three-dimensional network structure.
• The capacitance value of polypyrrole/MnO2/graphite felt is much higher than most of the polypyrrole/MnO2 composites reported previously.

Polypyrrole/MnO2 composites with unique three-dimensional network structure were successfully deposited on graphite felt (GF) fibers at the temperature of 50 °C to fabricate PYMG-HT composite, which can be used as a free-standing electrode for supercapacitors. For comparison, PYMG-LT electrode was also prepared in ice bath, and the polypyrrole/MnO2 deposits on GF prepared at 0 °C exhibit nano-flower shape, which is different from PYMG-HT. The PYMG-HT electrode displays specific capacitance as high as 821.3 F g−1 at the current density of 0.5 A g−1, which is much higher than that of PPy/MnO2 reported previously. Moreover, the PYMG-HT exhibits enhanced capacitive performance compared to PYMG-LT electrode.

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