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

被引：265

作者：

An, Qinyou ^{[1
]}

Lv, Fan ^{[1
]}

Liu, Qiuqi ^{[1
]}

Han, Chunhua ^{[1
]}

Zhao, Kangning ^{[1
]}

Sheng, Jinzhi ^{[1
]}

Wei, Qiulong ^{[1
]}

Yan, Mengyu ^{[1
]}

Mai, Liqiang ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, WUT Harvard Joint Nano Key Lab, Wuhan 430070, Peoples R China

来源：

NANO LETTERS | 2014年 / 14卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Iron oxides; vanadium oxides; graphene; hierarchical porous nanowires; lithium ion battery; ION BATTERY ANODE; SILICON NANOWIRES; PERFORMANCE; CARBON; IRON; SUPERCAPACITORS; NANOPARTICLES; MICROSPHERES; GRAPHENE; CATHODE;

D O I：

10.1021/nl5025694

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 center dot 1.1H(2)O@graphene nanowires along with the crystallization of Fe3O4 and the amorphization of vanadium oxide without using any hard templates. The hierarchical porous Fe3O4/VOx/graphene nanowires exhibit a high Coulombic efficiency and outstanding reversible specific capacity (1146 mAh g(-1)). Even at the high current density of 5 A g(-1), the porous nanowires maintain a reversible capacity of similar to 500 mAh g(-1). Moreover, the amorphization and conversion reactions between Fe and Fe3O4 of the hierarchical porous Fe3O4/VOx/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.

引用

页码：6250 / 6256

页数：7

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