کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1787497 | 1023444 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of TiO2-coated magnetite clusters (nFe3O4@TiO2) as anode materials for Li-ion batteries
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
TiO2-coated magnetite clusters (nFe3O4@TiO2) were facilely prepared through the sol-gel reaction between Ti alkoxides (TEOT) and magnetite clusters (nFe3O4) with terminated alkoxy groups. The composite particles represented a core-shell nanostructure (nFe3O4@TiO2) consisting of a Fe3O4 cluster core and a TiO2 capsule layer. The capsule layer of nFe3O4@TiO2 was increased with increasing amounts of TEOT (150, 300, 500 μl) in sol-gel reaction. The Fe3O4@TiO2 (150 μl of TEOT) with a thin TiO2 layer (ca. 10 nm) exhibited two kinds of cathodic (0.79 V and 1.61 V) and anodic (1.78 and 2.1 V) peaks attributed to the reduction and oxidation process by Fe3O4 core and TiO2 layer, respectively. The thin nFe3O4@TiO2 (150 μl of TEOT) exhibited the enhanced capacity retention by ca. 40% probably due to the buffering effect of TiO2 capsule layer. However, the thick nFe3O4@TiO2 (300-500 μl of TEOT) exhibited a rapid capacity fading due to the disintegrated core-shell nanostructure, i.e., unfavorable hetero-junction between TiO2 matrix and magnetite clusters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 13, Issue 9, November 2013, Pages 1923-1927
Journal: Current Applied Physics - Volume 13, Issue 9, November 2013, Pages 1923-1927
نویسندگان
Sung-Eun Kim, Kun-Woo Kim, Sang-Wha Lee, Sang-Ok Kim, Jung Sub Kim, Joong Kee Lee,