Large-Scale Porous Hematite Nanorod Arrays: Direct Growth on Titanium Foil and Reversible Lithium Storage

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• 作者：Yuqing Song ; Shanshan Qin ; Yangwei Zhang ; Wanqin Gao ; Jinping Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 16, 2010
• 年：2010
• 卷：114
• 期：49
• 页码：21158-21164
• 全文大小：416K
• 年卷期：v.114,no.49(December 16, 2010)
• ISSN：1932-7455

文摘

Porous single-crystalline hematite (α-Fe₂O₃) nanorod array has been synthesized on large-area Ti foil via a facile hydrothermal method followed by a simple annealing treatment in Ar gas at 450 °C. The nanorods attained from 6 h hydrothermal reaction are average 30 nm in diameter and 450 nm in length. When used directly as additive-free anode for lithium ion batteries (LIBs), the α-Fe₂O₃ nanorod array demonstrates excellent cycling performance up to 50 times (562 mAh g⁻¹ retained at C/5) and good rate capability, in distinct contrast to α-Fe₂O₃ nanorod powder-based electrode. The improved electrochemical performance could be ascribed to the enhanced electron transport and Li⁺ diffusion that result from the well-defined array architecture and the porous nature of the single-crystalline nanorods. Fe₃O₄ and C/α-Fe₂O₃ nanorod arrays are further prepared to improve the lithium storage property. Our work represents a successful example of fabricating iron oxide 1D nanostructure arrays directly on nonreactive current collector. Once optimized, the array electrode may hold great promise in thin-film LIBs and other microelectronic systems.