Generic Synthesis of Carbon Nanotube Branches on Metal Oxide Arrays Exhibiting Stable High-Rate and Long-Cycle Sodium-Ion Storage

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• 作者：Xinhui Xia ; Dongliang Chao ; Yongqi Zhang ; Jiye Zhan ; Yu Zhong ; Xiuli Wang ; Yadong Wang ; Ze Xiang Shen ; Jiangping Tu and Hong Jin Fan
• 刊名：Small
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：12
• 期：22
• 页码：3048-3058
• 全文大小：3588K
• ISSN：1613-6829

文摘

A new and generic strategy to construct interwoven carbon nanotube (CNT) branches on various metal oxide nanostructure arrays (exemplified by V₂O₃ nanoflakes, Co₃O₄ nanowires, Co₃O₄–CoTiO₃ composite nanotubes, and ZnO microrods), in order to enhance their electrochemical performance, is demonstrated for the first time. In the second part, the V₂O₃/CNTs core/branch composite arrays as the host for Na⁺ storage are investigated in detail. This V₂O₃/CNTs hybrid electrode achieves a reversible charge storage capacity of 612 mAh g⁻¹ at 0.1 A g⁻¹ and outstanding high-rate cycling stability (a capacity retention of 100% after 6000 cycles at 2 A g⁻¹, and 70% after 10 000 cycles at 10 A g⁻¹). Kinetics analysis reveals that the Na⁺ storage is a pseudocapacitive dominating process and the CNTs improve the levels of pseudocapacitive energy by providing a conductive network.