期刊
MATERIALS RESEARCH BULLETIN
卷 62, 期 -, 页码 19-23出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2014.11.010
关键词
Composites; Oxides; Chemical synthesis; Electrochemical properties
资金
- Scientific Research Foundation of Harbin Institute of Technology at Weihai [HIT(WH) 201315]
A novel three-dimensional (3D) Fe2O3/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 Fe2O3 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 similar to 600 mAh/g after 70 cycles, which greatly outperforms that of pure Fe2O3 nanotubes (similar to 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 Fe2O3 nanotubes, and preventing the aggregation of both Fe2O3 nanoparticles and RGO sheets. (C) 2014 Elsevier Ltd. All rights reserved.
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