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Designing Hierarchical Porous ZnO/ZnFe 2 O 4 Hybrid Nanofibers with Robust Core/Shell Heterostructure as Competitive Anodes for Efficient Lithium Storage
Author(s) -
Zhang Longhai,
Bao Ruiqi,
Xu Senyang,
Hou Linrui,
Zhang Chaofeng,
Yuan Changzhou
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000869
Subject(s) - materials science , anode , heterojunction , lithium (medication) , porosity , chemical engineering , nanotechnology , substrate (aquarium) , nanofiber , composite number , electrode , optoelectronics , composite material , chemistry , medicine , oceanography , geology , engineering , endocrinology
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/ZnFe 2 O 4 hybrid nanofibers (NFs) with robust core/shell heterostructure toward LIBs. In such hybrids, 2D ZnFe 2 O 4 nanosheets (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 ZnFe 2 O 4 NSs, the optimized ZnO/ZnFe 2 O 4 hybrid as an anode for LIBs delivers a large reversible capacity of ≈688 mAh g −1 at 0.1 A g −1 , high rate capability (≈288 mAh g −1 at 2.0 A g −1 ), and remarkable cyclability (≈491 mAh g −1 even 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.