Phase-Controlled Iron Oxide Nanobox Deposited on Hierarchically Structured Graphene Networks for Lithium Ion Storage and Photocatalysis

Scientific Reports
Sol YunHo Seok Park

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)/α-Fe2O3 and γ-Fe3O4 nanobox hybrids (hrGO/α-Fe and hrGO/γ-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/α-Fe NBhs is constructed, while α-Fe2O3 nanoboxes (NBs) in a proximate contact with the hrGO surface are simultaneously grown during a hydrothermal treatment. The discrete α-Fe2O3 NBs are uniformly distributed on the surface of the hrGO/α-Fe and confined in the 3D architecture, thereby inhibiting the restacking of rGO. After the subsequent phase transition into γ-Fe3O4, the hierarchical structure and the uniform distribution of NBs are preserved. Despite lower initial capacity, the hrGO/α-Fe NBhs show better rate and cyclic performances than those of commercial rGO/α-Fe due to the uniform distribution of discrete α-Fe2O3 NBs and electronic conductivity, macroporosity, and buffering effect of the hrGO for lithium ion ba...Continue Reading

References

Jul 2, 2009·Chemical Communications : Chem Comm·HoSeok ParkWon Hi Hong
Oct 8, 2011·Journal of the American Chemical Society·Bao WangXiong Wen Lou
Aug 17, 2012·Nanoscale·Chun Li, Gaoquan Shi
Jan 31, 2013·Chemical Society Reviews·Hailiang Wang, Hongjie Dai

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Citations

Sep 27, 2020·Materials·Woo Seob KimIl Tae Kim
Apr 6, 2018·Advanced Science·Zhongke YuanQuan Li
Feb 23, 2020·ACS Nano·Ramin Rojaee, Reza Shahbazian-Yassar

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Methods Mentioned

BETA
scanning
transmission electronmicroscopy
thermal treatment
scanning electron microscopy

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