Hydrogenated Oxygen-Deficient Blue Anatase as Anode for High-Performance Lithium Batteries

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• 作者：Jing Zheng ; Yousong Liu ; Guangbin Ji ; Peng Zhang ; Xingzhong Cao ; Baoyi Wang ; Chuhong Zhang ; Xuguang Zhou ; Yan Zhu ; Daning Shi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：7
• 期：42
• 页码：23431-23438
• 全文大小：561K
• ISSN：1944-8252

文摘

Blue oxygen-deficient nanoparticles of anatase TiO₂ (H-TiO₂) are synthesized using a modified hydrogenation process. Scanning electron microscope and transmission electron microscope images clearly demonstrate the evident change of the TiO₂ morphology, from 60 nm rectangular nanosheets to much smaller round or oval nanoparticles of 鈭?7 nm, after this hydrogenation treatment. Importantly, electron paramagnetic resonance and positronium annihilation lifetime spectroscopy confirm that plentiful oxygen vacancies accompanied by Ti³⁺ are created in the hydrogenated samples with a controllable concentration by altering hydrogenation temperature. Experiments and theory calculations demonstrate that the well-balanced Li⁺/e^{鈥?/sup> transportation from a synergetic effect between Ti3+/oxygen vacancy and reduced size promises the optimal H-TiO₂ sample a high specific capacity, as well as greatly enhanced cycling stability and rate performance in comparison with the other TiO₂.}