Facing the ever-increasing production of municipal plastics, great efforts have been made to recycle plastic waste into high-value-added products. As the main components of plastic wastes, polypropylene (PP), polyethylene (PE), and polystyrene (PS) are uncharred polymers that are difficult to carbonize under normal conditions. To address this issue, transition-metal catalysts (Co 3 O 4 ) were introduced to carbonize plastic waste with high carbon yields. Herein, mixed-waste plastics (PP/PE/PS) were carbonized into yolk−shell-structured (YSS) Co 3 O 4 @C nanomaterials with a high yield of 49 wt %. A high capacity of 1066 mAh g −1 was achieved at 0.1 A g −1 after 100 cycles in lithium-ion batteries (LIBs). Moreover, galvanostatic intermittent titration technique results estimated that the YSS Co 3 O 4 @C possessed a higher Li + diffusion coefficient, ensuring improved cycling stability and rate performance. The present strategy not only provides a potential approach for recycling waste plastics into high-value carbon materials but also shows the possibility for the mass production of high-performance nanosized anode materials for LIBs in a commercial manner.

Zinc‐ion capacitors (ZICs) are regarded as highly promising candidates for electrical energy storage systems (EESs). However, some challenges must be met to achieve high energy density and long cycling life in practical applications. Herein, we report on design and preparation of 2D nanosheets of N,P‐co‐doped hierarchical porous carbon (GNPCs) by a one‐step process. Benefitting from the mesopores supporting rapid diffusive ion transport, sufficient micropores for charge storage, and high electrical conductivity enabled by N,P‐doping, the resulting GNPC cathodes for ZICs achieved a high capacity of 401 F g−1. In a complete device a high energy density of 180 Wh kg−1 was obtained at a power density of 85 W kg−1 at 0.1 A g−1. More importantly, the ZICs exhibit a good cycling stability with a capacity retention of 95 % after 10 000 cycles at a current density of 5 A g−1. Our work presents a good strategy for developing high‐performance carbon‐based cathodes for ZICs.