Phase-Controlled Iron Oxide Nanobox Deposited on Hierarchically Structured Graphene Networks for Lithium Ion Storage and Photocatalysis.
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ABSTRACT: The phase control, hierarchical architecturing and hybridization of iron oxide is important for achieving multifunctional capability for many practical applications. Herein, hierarchically structured reduced graphene oxide (hrGO)/?-Fe2O3 and ?-Fe3O4 nanobox hybrids (hrGO/?-Fe and hrGO/?-Fe NBhs) are synthesized via a one-pot, hydrothermal process and their functionality controlled by the crystalline phases is adapted for energy storage and photocatalysis. The three-dimensionally (3D) macroporous structure of hrGO/?-Fe NBhs is constructed, while ?-Fe2O3 nanoboxes (NBs) in a proximate contact with the hrGO surface are simultaneously grown during a hydrothermal treatment. The discrete ?-Fe2O3 NBs are uniformly distributed on the surface of the hrGO/?-Fe and confined in the 3D architecture, thereby inhibiting the restacking of rGO. After the subsequent phase transition into ?-Fe3O4, the hierarchical structure and the uniform distribution of NBs are preserved. Despite lower initial capacity, the hrGO/?-Fe NBhs show better rate and cyclic performances than those of commercial rGO/?-Fe due to the uniform distribution of discrete ?-Fe2O3 NBs and electronic conductivity, macroporosity, and buffering effect of the hrGO for lithium ion battery anodes. Moreover, the catalytic activity and kinetics of hrGO/?-Fe NBhs are enhanced for photo-Fenton reaction because of the uniform distribution of discrete ?-Fe3O4 NBs on the 3D hierarchical architecture.
SUBMITTER: Yun S
PROVIDER: S-EPMC4731794 | biostudies-literature |
REPOSITORIES: biostudies-literature
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