Self-assembly of Fe{sub 2}O{sub 3}/reduced graphene oxide hydrogel for high Li-storage

Highlights: • A new composite hydrogel consisted of Fe{sub 2}O{sub 3} nanotubes and graphene has been prepared via hydrothermal method. • In this composite hydrogel, RGO sheets self-assemble into an interconnected macroporous framework and Fe{sub 2}O{sub 3} nanotubes encapsulate into RGO layers. • T...

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Bibliographic Details
Published in:Materials research bulletin 2015-02, Vol.62
Main Authors: Zhou, Weiwei, Ding, Chunyan, Jia, Xingtao, Tian, Ye, Guan, Qiaotian, Wen, Guangwu
Format: Article
Language:English
Subjects:
AGGLOMERATION
CAPACITY
CARBON OXIDES
CURRENT DENSITY
ELECTROCHEMISTRY
ELECTRONS
FERRITES
GRAPHENE
HYDROTHERMAL SYNTHESIS
IRON OXIDES
LAYERS
MATERIALS SCIENCE
NANOPARTICLES
NANOTUBES
PHASE STABILITY
SURFACE AREA
THREE-DIMENSIONAL LATTICES
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Summary:Highlights: • A new composite hydrogel consisted of Fe{sub 2}O{sub 3} nanotubes and graphene has been prepared via hydrothermal method. • In this composite hydrogel, RGO sheets self-assemble into an interconnected macroporous framework and Fe{sub 2}O{sub 3} nanotubes encapsulate into RGO layers. • The resulting composite hydrogel exhibits high specific capacity (850 mAh/g at 200 mA/g), good rate capability and cycling stability. - Abstract: A novel three-dimensional (3D) Fe{sub 2}O{sub 3}/reduced graphene oxide (RGO) hydrogel (FGH) is prepared by a facile hydrothermal strategy. In this composite hydrogel, RGO sheets self-assemble into an interconnected macroporous framework and Fe{sub 2}O{sub 3} nanotubes encapsulate into RGO layers. The FGH delivers high rate capacities of 850, 780, 550, and 400 mAh/g at current densities of 200, 400, 600, and 800 mA/g, respectively. The specific capacity can still maintain at ∼600 mAh/g after 70 cycles, which greatly outperforms that of pure Fe{sub 2}O{sub 3} nanotubes (∼60 mAh/g after 70 cycles). The improved electrochemical performance is ascribed to the unique macroscopic structure which is beneficial for enlarging the active surface area, shortening the electron/ion pathway, accommodating the volume change of Fe{sub 2}O{sub 3} nanotubes, and preventing the aggregation of both Fe{sub 2}O{sub 3} nanoparticles and RGO sheets.
ISSN:0025-5408
1873-4227
DOI:10.1016/J.MATERRESBULL.2014.11.010