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Novel Heterogeneous Hybrid of Yolk−Shell CuO@CuFe 2 O 4 : Facile Synthesis and Enhanced Lithium‐Storage Performance
Author(s) -
Liu Peng,
Lei Wu,
Xia Xifeng,
Hao Qingli
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700313
Subject(s) - materials science , anode , lithium (medication) , electrochemistry , shell (structure) , nanostructure , chemical engineering , yolk , metal , composite number , nanotechnology , electrode , composite material , chemistry , metallurgy , food science , engineering , endocrinology , medicine
Abstract Constructing heterogeneous components with a yolk−shell structure is highly desirable for improving the lithium‐storage performance of metal oxides, owing to the unique synergies of nanostructures and composite materials. In this work, a novel heterogeneous hybrid of yolk−shell CuO@CuFe 2 O 4 was synthesized through a simple two‐step method. Starting with Cu 2 O, the yolk−shell precursor was prepared through an interfacial reaction. After subsequent heat treatment of the precursor in air, yolk−shell CuO@CuFe 2 O 4 was obtained. A reasonable mechanism for the formation process of the yolk−shell CuO@CuFe 2 O 4 has been presented. The relatively high electrical conductivity of CuFe 2 O 4 , unique yolk−shell structure, and firm shell of the CuO@CuFe 2 O 4 account for the extremely enhanced electrochemical properties compared to bare CuO. In particular, discharge capacities of 505 and 36 mA h g −1 were delivered after 200 cycles at 500 mA g −1 by the yolk−shell CuO@CuFe 2 O 4 and bare CuO, respectively. This work not only provides a promising alternative anode material for lithium‐ion batteries, but also develops a new strategy to design the nanostructure and components of metal oxides for application in lithium‐ion batteries.