Preparation of supercapacitor electrode materials from e-waste: eco-friendly Cu recovery from printed circuit board waste using reduced graphene oxide and upcycling to Cu/CuO@C

Copper (Cu) was recovered from e-waste using reduced graphene oxide (rGO), and the recovered material was further upcycled into Cu/CuO@C. This upcycled material was then evaluated for its potential as an electrode material in supercapacitors.