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Three-dimensional hierarchical mesoporous flower-like TiO2@graphdiyne with superior electrochemical performances for lithium-ion batteries

Abstract

Three-dimensional hierarchical flower-like TiO2@graphdiyne are prepared via a hydrothermal process, and the structual properties and electrochemical performances are systematically investigated. The obtained results show that TiO2@graphdiyne delivers high reversible capacities of 432.4 mAhg-1 after 300 cycles at a current density of 1 A g-1, about 3 times that (139.7 mAh g-1) of the pristine TiO2. The high reversible capacities, excellent rate capability and cycle stability of TiO2@graphdiyne might be attributed to the hierarchical mesopority of graphdiyne with butadiyne linkages, which could not only provide interconnect innumerable active sites for lithium storage but also faciliate fast Li-ion diffusion. The built-in electric field deriving from the difference in work function between TiO2 and graphdiyne, could facilitate electron-transfer and Li-ion migration across heterojunction interfaces. Moreover, electron percolation and local built-in electric field induced by oxygen vacancies in TiO2 matrix, could also enhance the kinetic of Li-ion insertion/deinsertion.

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Publication details

The article was received on 24 Aug 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08225A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Three-dimensional hierarchical mesoporous flower-like TiO2@graphdiyne with superior electrochemical performances for lithium-ion batteries

    Z. Lin, G. Liu, Y. Zheng, Y. Lin and Z. Huang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08225A

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