Graphene‐Wrapped Graphitic Carbon Hollow Spheres: Bioinspired Synthesis and Applications in Batteries and Supercapacitors

Abstract Inspired by the egg‐like yolk–shell structure, a novel kind of graphene‐wrapped graphitic hollow carbon spheres (G‐graphitic HCS) was designed and fabricated by iron‐catalyzed carbonization of double‐coated polystyrene (PS) spheres. Herein, a thin carbon shell and hollow, hierarchically porous G‐graphitic HCS facilitate ionic transport, while also providing more active sites for the storage of ions. Both graphitic components result in a seamless and highly efficient transmission pathway for electrons. Thus, G‐graphitic HCS demonstrate admirable multifunctions in energy‐storage devices, including lithium batteries, sodium batteries, and supercapacitors. It delivers an unprecedentedly high initial discharge capacity of 2007 mA h g⁻¹ at 0.1 A g⁻¹, and preserves 92.4 % of the initial charge capacity after 100 cycles in a prototype lithium half‐cell. The present concept may shed light on designing the key materials for next‐generation energy‐storage devices.