A green and all-carbon AQ@PNCNTs//PNTs ASC device that can deliver an energy density as high as 32.7 W h kg−1 at the power density of 700 W kg−1 is reported.
Representation of the synthesis steps of SnO2QDs/GO/PPY ternary composites and SnO2QDs/GO/PPY//GO/charcoal asymmetric supercapacitor device.