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

Journal Article · Sun Feb 15 04:00:00 EST 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.11.010· OSTI ID:22420818

Zhou, Weiwei; Ding, Chunyan; Jia, Xingtao; Tian, Ye; Guan, Qiaotian; Wen, Guangwu

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.

• OSTI ID: 22420818
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 62; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 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