Fe2O3-5wt%CNT composite is sintered by an atmospheric pressure plasma jet (APPJ).
APPJ-sintered nanoporous Fe2O3/CNT can be used for supercapacitors.
The addition of 5 wt% CNTs improves the specific capacitance from 16 to 54 F/g.
Nitrogen APPJ is an efficient tool for supercapacitor fabrication.