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Convenient Approach to °-Fe2O3 Nanoparticles: Magnetic and Electrochemical Properties
Bei-bei Li ,Ming-rong Ji* ,Xiao-min Ni ,Fu Zhou ,Dong-en Zhang ,Jing Cheng
Author NameAffiliation
Bei-bei Li Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China 
Ming-rong Ji* Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China 
Xiao-min Ni Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 
Fu Zhou Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 
Dong-en Zhang Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 
Jing Cheng Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 
Abstract:
A convenient approach is reported for the synthesis of spherical maghemite (°-Fe2O3) nanoparticles. The process was realized by the controlled oxidation of Fe3O4 precursor, which originated from a facile partialreduction co-precipitation process. The starting material of hydrosulfurous sodium (Na2S2O4), which can allow reaction to proceed without any deoxygenated protection, was proven to be important in the formation of the precursor. A series of techniques, including X-ray diffraction, transmission electron microscopy and a vibrating sample magnetometer were used to characterize the product. The resultant °-Fe2O3 nanoparticles exhibited ferromagnetism at 300 K and the values of saturation magnetization and coercivity were 70 emu/g and 164 Oe, respectively. The electrochemical properties of lithium ions intercalation into °-Fe2O3 nanoparticles were tested in Te°on cells. A specific capacity of 933 mAh/g was delivered at a current density of 0.2 mA/cm2 (voltage range 3.0-0.3 V vs. Li), corresponding to the reaction of 5.7 Li+ per Fe2O3. A possible mechanism of the reaction of lithium with maghemite spinel was discussed.
Key words:  Magnetic materials, Chemical synthesis, Electrochemical properties
FundProject:
简单的方法制备°-Fe2O3纳米粒子及其磁性质和电化学性质
李蓓蓓 ,季明荣 * ,倪小敏 ,周复 ,张东恩 ,程静
摘要:
报道了制备磁性Fe2O3纳米粒子的一种简单易行的方法.利用部分还原共沉淀法, 以Na2S2O4作为还原剂, 用FeCl3先制备出Fe2O3纳米微粒, 再在空气中直接煅烧, 成功地制备出粒径较均匀(约13 nm)的磁性Fe2O3微粒. 实验发现Na2S2O4在部分还原共沉淀法中起到了去氧剂兼还原剂的特殊作用.研究表明, 样品在室温下具有铁磁性, 其饱和磁化强度和矫顽力分别为70 emu/g和164 Oe; 产物具有好的电化学性质,在3.0?0.3 V(相对于金属锂)、0.2 mA/cm2时,样品的首次放电容量可达到933 mAh/g.同时还讨论了放电过程中金属锂与Fe2O3的反应机理.
关键词:  磁性材料,化学合成,电化学性质
DOI:10.1360/cjcp2007.20(2).203.4
分类号: