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Author Zhou, Weiwei ♦ Ding, Chunyan ♦ Jia, Xingtao ♦ Tian, Ye ♦ Guan, Qiaotian ♦ Wen, Guangwu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ AGGLOMERATION ♦ CAPACITY ♦ CARBON OXIDES ♦ CURRENT DENSITY ♦ ELECTROCHEMISTRY ♦ ELECTRONS ♦ FERRITES ♦ GRAPHENE ♦ HYDROTHERMAL SYNTHESIS ♦ IRON OXIDES ♦ LAYERS ♦ NANOPARTICLES ♦ NANOTUBES ♦ PHASE STABILITY ♦ SURFACE AREA ♦ THREE-DIMENSIONAL LATTICES
Abstract 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 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-02-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 62


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