Recycled ZnO‐fused macroporous 3D graphene oxide aerogel composites for high‐performance asymmetric supercapacitors

In the arena of energy storage device, asymmetric supercapacitors (ASCs) are considered a key category due to its high‐power density and energy densities. In this study, a novel macroporous microrecycled ZnO nanoparticles (mi‐ZnO NPs) recovered from spent Zn–C battery‐decorated three‐dimensional graphene aerogel (GA) composite has been synthesized via simple eco‐friendly synthetic method, which is used as a proficient anode material to fabricate ASC. The interconnected macroporous networks and ∼40‐nm microrecycled ZnO NPs incorporated GA (mi‐ZnO–GA) enhanced the surface area of anode materials, which lead to achieve a formation of high‐performance ASC. Here, we composed ASCs from a microrecycled ZnO thin film (cathode) and mi‐ZnO–GA composite (anode), which reveals fast charging/discharging characteristics, stable widen cell voltage, superior power, and energy densities (13.7 W h/kg, 13.2 kW/kg), and finally stable cyclability (76.8% retention after 5000 cycles). These outcomes open up the window for microrecycled ZnO NPs incorporated GA (mi‐ZnO–GA) as a prominent anode material for high‐performance energy storage devices.