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Issue 4, 2017
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Mesoporous TiO2@N-doped carbon composite nanospheres synthesized by the direct carbonization of surfactants after sol–gel process for superior lithium storage

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Abstract

Here, we report mesoporous TiO2@N-doped carbon composite nanospheres synthesized via a double-surfactant-assisted assembly sol–gel process followed by sequential carbonization of surfactants under a N2 atmosphere. The resulting TiO2@N-doped C composite nanospheres are composed of uniformly distributed TiO2 nanocrystals with a diameter of ∼8 nm coated by a N-doped carbon layer that was formed by surfactants. Moreover, a large number of connected mesopores were observed in the nanospheres after high-temperature carbonization treatment. The synthesized nanospheres possess a large specific surface area (∼120 m2 g−1) and a large pore size (4–40 nm), with a well-defined spherical structure and a diameter in the nanoscale range. As an anode material for lithium-ion batteries (LIB), the mesoporous composite nanospheres delivered a reversible capacity of ∼117 mA h g−1 after 2000 cycles at a current rate as high as 10 C, as well as superior rate capability. The N-doped carbon layers greatly improved the overall electrical conductivity of the mesoporous TiO2 nanospheres. This study provides a remarkable synthetic route for the preparation of mesoporous TiO2-based N-doped carbon composite materials as high-performance anode materials in LIBs.

Graphical abstract: Mesoporous TiO2@N-doped carbon composite nanospheres synthesized by the direct carbonization of surfactants after sol–gel process for superior lithium storage

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Publication details

The article was received on 14 Nov 2016, accepted on 12 Dec 2016 and first published on 14 Dec 2016


Article type: Paper
DOI: 10.1039/C6NR08885F
Citation: Nanoscale, 2017,9, 1539-1546
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    Mesoporous TiO2@N-doped carbon composite nanospheres synthesized by the direct carbonization of surfactants after sol–gel process for superior lithium storage

    H. Zhu, Y. Jing, M. Pal, Y. Liu, Y. Liu, J. Wang, F. Zhang and D. Zhao, Nanoscale, 2017, 9, 1539
    DOI: 10.1039/C6NR08885F

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