期刊
ACS NANO
卷 12, 期 1, 页码 820-828出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b08186
关键词
2D holey nanosheet architectures; confined self-assembly; Pluronic copolymers; lithium-ion batteries; energy storage
类别
资金
- Center for Mesoscale Transport Properties, an Energy Frontier Research Center from the U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012673]
- Center for Functional Nanomaterials, a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC0012704]
- National Science Foundation Graduate Research Fellowship Program [1109408]
Advances in liquid-phase exfoliation and surfactant-directed anisotropic growth of two-dimensional (2D) nanosheets have enabled their rapid development. However, it remains challenging to develop assembly strategies that lead to the construction of 2D nanomaterials with well-defined geometry and functional nanoarchitectures that are tailored to specific applications. Here we report a facile self-assembly method leading to the controlled synthesis of 2D transition metal oxide (TMO) nanosheets containing a high density of holes. We utilize graphene oxide sheets as a sacrificial template and Pluronic copolymers as surfactants. By using ZnFe2O4 (ZFO) nanoparticles as a model material, we demonstrate that by tuning the molecular weight of the Pluronic copolymers we can incorporate the ZFO particles and tune the size of the holes in the sheets. The resulting 213 ZFO nanosheets offer synergistic characteristics including increased electrochemically active surface areas, shortened ion diffusion paths, and strong inherent mechanical properties, leading to enhanced lithium-ion storage properties. Postcycling characterization confirms that the samples maintain structural integrity after electrochemical cycling. Our findings demonstrate that this template-assisted self-assembly method is a useful bottom-up route for controlled synthesis of 2D nanoarchitectures, and these holey 2D nanoarchitectures are promising for improving the electrochemical performance of next-generation lithium-ion batteries.
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