Synthesis of Rhombic Dodecahedral Fe3O4 Nanocrystals with Exposed High-Energy {110} Facets and Their Peroxidase-like Activity and Lithium Storage Properties
Synthesis of Rhombic Dodecahedral Fe3O4 Nanocrystals with Exposed High-Energy {110} Facets and Their Peroxidase-like Activity and Lithium Storage Properties
复制标题
具有暴露高能{110}面的菱形十二面体Fe3O4纳米晶的合成及其类过氧化物酶活性和锂储存性能
DOI：
10.1021/jp412661e
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发表时间：
2014-06-19
影响因子：
3.7
通讯作者：
Zhao, Zhen-Jie
中科院分区：
文献类型：
--
作者：
Cheng, Xun-Liang;Jiang, Ji-Sen;Zhao, Zhen-Jie
采用甲苯-水两相界面反应法制备了大量单分散的单晶菱形十二面体（RD）Fe 3 O 4纳米晶。通过调节Fe（acac）3的浓度和水合肼的体积，可以将其粒径控制在60 ~ 100 nm之间。FT-IR分析表明，这些具有暴露的高能{110}面的RD Fe 3 O 4纳米晶的形成可能是C17 H33 COO-选择性稳定这些不稳定面的结果。磁性测量表明，在室温下RD Fe 3 O 4 NC的饱和磁化强度（M-s）为85 emu/g。当用作过氧化物酶模拟物时，所制备的RD Fe 3 O 4 NCs对底物3，3 '，5，5'-四甲基联苯胺的氧化和苯胺化合物亚甲基蓝染料在H2 O2存在下的降解显示出优异的过氧化物酶样催化活性。在0.2C的电流密度下，其首次放电容量达到1147 mA h g（-1），循环性能良好（在0.2C下100次循环后为362 mA h g-1，在1C下高达130次循环时为191 mA h g（-1）），并且在1- 4C的高电流倍率下具有良好的倍率性能。
Large quantities of monodispersed single-crystal rhombic dodecahedral (RD) Fe3O4 nanocrystals (NCs) bounded by high-energy {110} facets were prepared by using a one-pot toluene-water two-phase interfacial reaction method. By adjusting the Fe(acac)3 concentration and the volume of hydrazine hydrate, their sizes could be controlled in the range from 60 to 100 nm. The formation of these RD Fe3O4 NCs with exposed high-energy {110} surfaces might be the result of selective stabilization of such unstable facets by the C17H33COO- based on FT-IR analysis. The magnetic measurement revealed that the saturation magnetization (M-s) of the RD Fe3O4 NCs was 85 emu/g at room temperature. When used as peroxidase mimetics, the prepared RD Fe3O4 NCs showed excellent peroxidase-like catalytic activity toward oxidation of the substrate 3,3',5,5'-tetramethylbenzidine and degradation of the aniline compound methylene blue dye in the presence of H2O2. When tested as anode materials for lithium-ion batteries, these as-obtained RD Fe3O4 NCs showed a high initial discharge capacity of 1147 mA h g(-1) at the current density of 0.2 C, a good cycle performance (362 mA h g-1 at 0.2 C after 100 cycles and 191 mA h g(-1) at 1 C up to 130 cycles), and good rate capability at high current rates of 1-4 C.