【作者】 霍瑛； 谢健； 曹高劭； 朱铁军； 赵新兵；

【Author】 Huo Ying~1,Xie Jian~(2*),Cao Gaoshao~(2*),Zhu TieJun~2,Zhao Xinbing~2 (1.Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310027; 2.Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310027;)

【机构】 浙江大学材料科学与工程系；

【摘要】 我们采用水热法,以FeCl₃·6H₂O和NH₄H₂PO₄为原料可控合成了不同纳米结构的α-Fe₂O₃。我们发现通过调节反应时间,氧化铁的形貌从中间产物纳米纺锤体,纳米颗粒和纳米片逐渐的变化为空心纳米管、纳米珠子、纳米环等结构。通过调节磷酸根的浓度,氧化铁的形貌会有纳米长管到纳米环的变化。这些变化都要归结于磷酸根离子的选择性吸附和氧化铁的选择性溶解。我们将氧化铁在乙炔气体中热还原,得到碳包覆的四氧化三铁。我们测试了包碳后的四氧化三铁的电池性能。更多还原

【Abstract】 We present in this work the controllable synthesis of hollow nanostructures ofα-Fe₂O₃ using a facile hydrothermal route using FeCl₃·6H₂O as the iron source and NH₄H₂PO₄ as the shape-directing agent We found that the morphology ofα-Fe₂O₃ exhibits a continuous change from thin nanospindles to flat nanoplates via finely tuning the phosphate ion concentration at a given reaction time due to the selective absorption ofphosphate ions on Fe₂O₃.At a given phosphate ion concentration,prolonging the reaction time leads to the formation of hollow nanostructures,nanotubes,nanobeads,and nanorings due to the dissolution and re-crystallization of Fe₂O₃.We also found that morphology-reserved conversion from a-Fe₂O₃ to magnetic Fe₃O₄/C can be achieved during the CVD reaction in C₂H₂.The Fe₃O₄/C shows a good property for Lithium-ion battery.更多还原