Synthesis of Rhombic Dodecahedral Fe3O4 Nanocrystals with Exposed High-Energy {110} Facets and Their Peroxidase-like Activity and Lithium Storage Properties

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• 作者：Xun-Liang Cheng ; Ji-Sen Jiang ; Dong-Mei Jiang ; Zhen-Jie Zhao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 19, 2014
• 年：2014
• 卷：118
• 期：24
• 页码：12588-12598
• 全文大小：776K
• 年卷期：v.118,no.24(June 19, 2014)
• ISSN：1932-7455

文摘

Large quantities of monodispersed single-crystal rhombic dodecahedral (RD) Fe<sub>3sub>O<sub>4sub> nanocrystals (NCs) bounded by high-energy {110} facets were prepared by using a one-pot toluene鈥搘ater two-phase interfacial reaction method. By adjusting the Fe(acac)<sub>3sub> 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 Fe<sub>3sub>O<sub>4sub> NCs with exposed high-energy {110} surfaces might be the result of selective stabilization of such unstable facets by the C<sub>17sub>H<sub>33sub>COO<sup>鈥?/sup> based on FT-IR analysis. The magnetic measurement revealed that the saturation magnetization (M<sub>ssub>) of the RD Fe<sub>3sub>O<sub>4sub> NCs was 85 emu/g at room temperature. When used as peroxidase mimetics, the prepared RD Fe<sub>3sub>O<sub>4sub> NCs showed excellent peroxidase-like catalytic activity toward oxidation of the substrate 3,3鈥?5,5鈥?tetramethylbenzidine and degradation of the aniline compound methylene blue dye in the presence of H<sub>2sub>O<sub>2sub>. When tested as anode materials for lithium-ion batteries, these as-obtained RD Fe<sub>3sub>O<sub>4sub> NCs showed a high initial discharge capacity of 1147 mA h g<sup>鈥?sup> at the current density of 0.2 C, a good cycle performance (362 mA h g<sup>鈥?sup> at 0.2 C after 100 cycles and 191 mA h g<sup>鈥?sup> at 1 C up to 130 cycles), and good rate capability at high current rates of 1鈥? C.