Amorphous Vanadium Oxide Matrixes Supporting Hierarchical Porous Fe3O4/Graphene Nanowires as a High-Rate Lithium Storage Anode

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• 作者：Qinyou An ; Fan Lv ; Qiuqi Liu ; Chunhua Han ; Kangning Zhao ; Jinzhi Sheng ; Qiulong Wei ; Mengyu Yan ; Liqiang Mai
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：6250-6256
• 全文大小：553K
• ISSN：1530-6992

文摘

Developing electrode materials with both high energy and power densities holds the key for satisfying the urgent demand of energy storage worldwide. In order to realize the fast and efficient transport of ions/electrons and the stable structure during the charge/discharge process, hierarchical porous Fe₃O₄/graphene nanowires supported by amorphous vanadium oxide matrixes have been rationally synthesized through a facile phase separation process. The porous structure is directly in situ constructed from the FeVO₄路1.1H₂O@graphene nanowires along with the crystallization of Fe₃O₄ and the amorphization of vanadium oxide without using any hard templates. The hierarchical porous Fe₃O₄/VO_x/graphene nanowires exhibit a high Coulombic efficiency and outstanding reversible specific capacity (1146 mAh g^鈥?). Even at the high current density of 5 A g^鈥?, the porous nanowires maintain a reversible capacity of 鈭?00 mAh g^鈥?. Moreover, the amorphization and conversion reactions between Fe and Fe₃O₄ of the hierarchical porous Fe₃O₄/VO_x/graphene nanowires were also investigated by in situ X-ray diffraction and X-ray photoelectron spectroscopy. Our work demonstrates that the amorphous vanadium oxides matrixes supporting hierarchical porous Fe₃O₄/graphene nanowires are one of the most attractive anodes in energy storage applications.

Keywords:

Iron oxides; vanadium oxides; graphene; hierarchical porous nanowires; lithium ion battery