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Ultrafine polycrystalline titania nanofibers for superior sodium storage

查看全文 作　　者：Zhidan [1]Diao;Daming [1]Zhao;Chunxiao [2]Lv;Hongli [2]Liu;Dongjiang [2]Yang;Shaohua [1]Shen 高影响力作者 机构地区：[1]International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;[2]School of Environmental Science and Engineering,Collaborative Innovation Center,for Marine Biomass Fibers,Materials and Textiles of Shandong Province,Qingdao University,Qingdao 266071,Shandong,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2019年第28卷第11期,共9页高影响力期刊 基　　金：financial support from the National Natural Science Foundation of China (Nos. 51672210 , 21875183);the National Program for Support of Top-notch Young Professionals 摘　　要：Sodium ion batteries have a huge potential for large-scale energy storage for the low cost and abundance of sodium resources. In this work, a novel structure of ultrafine polycrystalline TiO2 nanofibers is prepared on nickel foam/carbon cloth by a simple vapor deposition method. The as-prepared TiO2 nanofibers show excellent performance when used as anodes for sodium-ion batteries. Specifically, the TiO2 nanofibers@nickel foam electrode delivers a high reversible capacity of 263.2 m Ahg^-1 at 0.2 C and maintains a considerable capacity of 144.2 m Ahg^-1 at 10 C. The TiO2 nanofibers@carbon cloth electrode also shows excellent high-rate capability, sustaining a capacity of 148 m Ahg^-1 after 20 0 0 cycles at 10 C. It is believed that the novel nanofibrous structure increases the contact area with the electrolyte and greatly shortens the sodium ion diffusion distance, and meanwhile, the polycrystalline nature of nanofibers exposes more intercalation sites for sodium storage. Furthermore, the density functional theory calculations exhibit strong ionic interactions between the exposed TiO2(101) facets and sodium ions, leading to a preferable sodiation/desodiation process. The unique structural features endow the TiO2 nanofibers electrodes great advantages in rapid sodium storage with an outstanding high-rate capability. 关 键 词：POLYCRYSTALLINE TITANIA NANOFIBERS SODIUM STORAGE High-rate capability
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