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Acetic acid induced preparation of anatase TiO2 mesocrystals at low temperature for enhanced Li-ion storage

Abstract

Titanium dioxide (TiO2) mesocrystal consisted of a large number of subunits possesses distinct characteristic of large surface area, high crystallinity and large density, which is considered as a promising potential material for energy storage and conversion, sensing, and photocatalysis. Therefore, it is significant to develop a robust and universal method to synthesize and precisely tuned the TiO2 mesocrystals at low temperature. However, this is still a big challenge and has not been largely achieved. In this context, we develop a robust method to synthesize the TiO2 mesocrystals by a facile hydrolysis and evolution process induced by acetic acid (HAc) solution at 80 oC using TiN as starting material. The size and crystallinity of TiO2 mesocrystals can be easily tuned by adjusting the HAc content and reaction time. The HAc governs the transformation of TiO2 from amorphous state to anatase phase at low temperature (80 oC). The average size of TiO2 mesocrystals can be tuned from ~100 nm to 20 nm by changing the HAc content. TiO2 mesocrystals with the spindle-like morphology was formed and the tiny anatase TiO2 grains are grown along the same orientation [001] plane, which exhibits excellent electrochemical performance for lithium-ion storage. The specific capacity at 1 C is 180 mAh g-1 and the retention is 92.9 % after 100 cycles. Thereby, this study presents a universal method to craft the anatase TiO2 mesocrystals at low temperature.

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Publication details

The article was received on 17 Mar 2017, accepted on 10 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7TA02361H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Acetic acid induced preparation of anatase TiO2 mesocrystals at low temperature for enhanced Li-ion storage

    Y. Li, S. Wang, D. Lei, Y. He, B. Li and F. Kang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02361H

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