From wasted polymers to N/O co-doped partially graphitic carbon with hierarchical porous architecture as a promising cathode for high performance Zn-ion hybrid supercapacitors

N/O co-doped graphitic hierarchical porous carbon is yielded from wasted polymers. A capacity of 257.9 mA h g −1 with an ultrahigh energy density of 226.5 W h kg −1 is delivered. Excellent energy storage ability is also obtained for wearable devices.