Designing Hierarchical Porous ZnO/ZnFe2O4Hybrid Nanofibers with Robust Core/Shell Heterostructure as Competitive Anodes for Efficient Lithium Storage

Hierarchical hybrid heteroarchitectures possess attractive structural/compositional merits for lithium‐ion batteries (LIBs). Herein, a facile yet in situ growth strategy is proposed to scalably synthesize hierarchical porous ZnO/ZnFe2O4hybrid nanofibers (NFs) with robust core/shell heterostructure toward LIBs. In such hybrids, 2D ZnFe2O4nanosheets (NSs) are uniformly decorated on single‐crystalline ZnO core NFs, thereby affording more exposed active sites, a fast ion diffusion kinetic, and structural stability of electrodes during repeated cycling. As a result, benefiting from the unique hierarchical porous core/shell architecture and synergistic effects between the stable substrate of ZnO NFs and high‐capacity promoter of ZnFe2O4NSs, the optimized ZnO/ZnFe2O4hybrid as an anode for LIBs delivers a large reversible capacity of ≈688 mAh g−1at 0.1 A g−1, high rate capability (≈288 mAh g−1at 2.0 A g−1), and remarkable cyclability (≈491 mAh g−1even over 250 cycles at 0.5 A g−1) for efficient lithium storage. This work highlights the rational design of a hierarchical architecture with a stable substrate and high‐capacity phases for next‐generation energy storage applications. Hierarchical porous ZnO/ZnFe2O4hybrid nanofibers (NFs) with robust core/shell heterostructure are smartly designed and exhibit efficient lithium storage in terms of reversible apacity, rate property, and cyclability as competitive anodes for advanced Li‐ion batteries.